Tootfinder

Today's Experiments Suffice to Verify the Quantum Essence of Gravity
Martin Pl\'avala
https://arxiv.org/abs/2508.03052 https://arxiv.org/pdf/2508.0…

Today's Experiments Suffice to Verify the Quantum Essence of Gravity
The gravity-mediated entanglement experiments employ concepts from quantum information to argue that if gravitational interaction creates entanglement between two systems, then gravity cannot be described by a classical system. However, the proposed experiments remain beyond out current technological capability, with optimistic projections placing the experiment outside of short-term future. Here we leverage quantum information techniques to argue that current matter-wave interferometers are su…

Regulator and gauge dependence of the Abelian gauge coupling in asymptotically safe quantum gravity
Maksym Riabokon, Marc Schiffer, Fabian Wagner
https://arxiv.org/abs/2508.03563

Regulator and gauge dependence of the Abelian gauge coupling in asymptotically safe quantum gravity
Both General Relativity and the Standard Model of particle physics are not UV complete. General Relativity is perturbatively non-renormalizable, while the Standard Model features Landau poles, where couplings are predicted to diverge at finite energies, e.g., in the Abelian gauge sector. Asymptotically safe quantum gravity may resolve both of these issues at the same time. In this paper, we assess the systematic uncertainties associated with this scenario, in particular with the gravitationally…

Study of Kiselev Black Hole in Quantum Fluctuation Modified Gravity via Quasinormal modes and Greybody Factors
W. Sajjad, M. Azam
https://arxiv.org/abs/2510.02409 https://

Study of Kiselev Black Hole in Quantum Fluctuation Modified Gravity via Quasinormal modes and Greybody Factors
In this work, we formulate the wave function to compute the effective potential of scalar and vector fields for the Kiselve black hole in the background of quantum fluctuation modified gravity. Using the 6th-order Wentzel-Kramers-Brillouin approach, the quasinormal modes for the considered black hole are obtained through scalar and vector perturbation fields. We investigate the quasinormal frequency by considering several values of the metric and equation of state ($\mho$ and $\bar{\barω}$) pa…

Bounding anisotropic Lorentz Invariance Violation from measurements of the effective energy scale of quantum gravity
Merce Guerrero, Anna Campoy-Ordaz, Robertus Potting, Markus Gaug
https://arxiv.org/abs/2508.02883

Bounding anisotropic Lorentz Invariance Violation from measurements of the effective energy scale of quantum gravity
Observations of energy-dependent photon time delays from distant flaring sources provide significant constraints on Lorentz Invariance Violation (LIV). Such effects originate from modified vacuum dispersion relations, causing differences in propagation times for photons emitted simultaneously from gamma-ray bursts, active galactic nuclei, or pulsars. These modifications are often parametrized within a general framework by an effective quantum gravity energy scale $E_{QG,n}$. While such general …

Quantum Oppenheimer-Snyder Black Hole with Quintessential Dark Energy and a String Clouds: Geodesics, Perturbative Dynamics, and Thermal Properties
Faizuddin Ahmed, Ahmad Al-Badawi, \.Izzet Sakall{\i}
https://arxiv.org/abs/2508.03202

Quantum Oppenheimer-Snyder Black Hole with Quintessential Dark Energy and a String Clouds: Geodesics, Perturbative Dynamics, and Thermal Properties
In this paper, we explore a deformed Schwarzschild black hole (BH) within a loop quantum gravity (LQG) framework incorporating both a quintessence field (QF) and a cloud of strings (CS), aiming to understand how these exotic fields collectively influence various physical phenomena in the BH's vicinity. We systematically investigate the quantum Oppenheimer--Snyder (QOS) spacetime by deriving the complete metric and analyzing horizon structures, showing significant modifications to the classical …

Quantum Vacuum energy as the origin of Gravity
Andr\'e LeClair
https://arxiv.org/abs/2509.02636 https://arxiv.org/pdf/2509.02636

Quantum Vacuum energy as the origin of Gravity
We explore the idea that quantum vacuum energy $ρ_{\rm vac} $ is at the origin of Gravity as a theoretical exercise. We formulate a gravitational version of the electromagnetic Casimir effect, and provide an argument for how gravity can arise from $ρ_{\rm vac} $ by showing how Einstein's field equations emerge in the form of Friedmann's equations. This leads to the idea that Newton's constant $G_N$ is environmental, namely it depends on the total mass-energy of the Universe $M_\infty $ and it…

Precision gravity constraints on large dark sectors
Christopher Ewasiuk, Stefano Profumo
https://arxiv.org/abs/2509.02801 https://arxiv.org/pdf/2509.02801

Precision gravity constraints on large dark sectors
General relativity, treated as a low-energy effective field theory, predicts quantum corrections to Newton's law of gravitation arising from loops of matter and graviton fields. While these corrections are utterly negligible when considering the Standard Model particle content, the situation changes dramatically in the presence of a hidden or dark sector containing a very large number of light degrees of freedom. In such cases, loop-induced modifications to the Newtonian potential can accumulat…

Unveiling horizons in quantum critical collapse
Marija Toma\v{s}evi\'c, Chih-Hung Wu
https://arxiv.org/abs/2509.03584 https://arxiv.org/pdf/2509.03584

Unveiling horizons in quantum critical collapse
Critical gravitational collapse offers a unique window into regimes of arbitrarily high curvature, culminating in a naked singularity arising from smooth initial data -- thus providing a dynamical counterexample to weak cosmic censorship. Near the critical regime, quantum effects from the collapsing matter are expected to intervene before full quantum gravity resolves the singularity. Despite its fundamental significance, a self-consistent treatment has so far remained elusive. In this work, we…

Replaced article(s) found for physics.ins-det. https://arxiv.org/list/physics.ins-det/new
[1/1]:
- Towards a realistic noise modelling of quantum sensors for future satellite gravity missions
Encarnacao, Siemes, Daras, Carraz, Strangfeld, Zingerle, Pail

Semi-local observables, edge modes and quantum reference frames in quantum electromagnetism: an algebraic approach
Christopher J. Fewster, Daan W. Janssen, Kasia Rejzner
https://arxiv.org/abs/2508.20939

Semi-local observables, edge modes and quantum reference frames in quantum electromagnetism: an algebraic approach
Boundaries and corners of spacetime play a vital role in understanding physical concepts including entanglement entropy, the infrared problem in QFT and quantum gravity. Standard local quantum field theory struggles to accommodate such boundary-sensitive observables. In this paper we develop an algebraic framework for \emph{semi-local quantum electromagnetism} on finite Cauchy lenses: a class of compact spacetimes with boundaries and corner. At the classical level, we establish a decomposition …

Dispersion in Analogue Gravity
Eren Erberk Erkul, Ulf Leonhardt
https://arxiv.org/abs/2510.02542 https://arxiv.org/pdf/2510.02542

Dispersion in Analogue Gravity
Analogue models of gravity, from Newton to Unruh, have evolved from simple fluid--mechanical models to sophisticated modern experiments. They have shown the robustness of Hawking radiation and highlighted the role of dispersion for quantum fields in curved space. We speculate whether some underlying dispersion may also play a role in explaining the cosmological constant and in resolving the cosmological tensions.

Replaced article(s) found for cond-mat.dis-nn. https://arxiv.org/list/cond-mat.dis-nn/new
[1/1]:
- Beyond holography: the entropic quantum gravity foundations of image processing
Ginestra Bianconi

Machine learning in lattice quantum gravity
Jan Ambjorn, Zbigniew Drogosz, Jakub Gizbert-Studnicki, Andrzej G\"orlich, D\'aniel N\'emeth, Marcus Reitz
https://arxiv.org/abs/2510.02159

Machine learning in lattice quantum gravity
Using numerical data coming from Monte Carlo simulations of four-dimensional Causal Dynamical Triangulations, we study how automated machine learning algorithms can be used to recognize transitions between different phases of quantum geometries observed in lattice quantum gravity. We tested seven supervised and seven unsupervised machine learning models and found that most of them were very successful in that task, even outperforming standard methods based on order parameters.

Singularity resolution in the backreacted Schwarzschild geometry from 2D matter with negative central charge
F. J. Mara\~n\'on-Gonz\'alez, A. del R\'io, J. Navarro-Salas
https://arxiv.org/abs/2510.02447

Singularity resolution in the backreacted Schwarzschild geometry from 2D matter with negative central charge
Two-dimensional dilaton gravity provides a valuable framework to study the dynamics of quantum black holes. These models are often coupled to conformal scalar fields, which capture essential quantum effects such as the trace anomaly, while remaining analytically tractable. From the viewpoint of two-dimensional quantum field theory, unitary theories require a positive central charge. However, theories with a total negative central charge naturally arise from the contribution of the Faddeev-Popov…

Exploring Pintopia: Reflection Branes, Bordisms, and U-Dualities
Vivek Chakrabhavi, Arun Debray, Markus Dierigl, Jonathan J. Heckman
https://arxiv.org/abs/2509.03573 https://

Exploring Pintopia: Reflection Branes, Bordisms, and U-Dualities
The U-dualities of maximally supersymmetric non-chiral supergravity (SUGRA) theories lead to strong constraints on the non-perturbative structure of quantum gravity. In this paper we determine Spin- and Pin-lifts of these dualities, which extend this action to fermionic degrees of freedom. Among other things, this allows us to access non-supersymmetric sectors of these low energy effective field theories in which bosonic and fermionic degrees of freedom are treated differently. We use this refi…

Counting gauge-invariant states with matter fields and finite gauge groups
Alessandro Mariani
https://arxiv.org/abs/2509.02173 https://arxiv.org/pdf/2509.0…

Counting gauge-invariant states with matter fields and finite gauge groups
Gauge theories with finite gauge groups have applications to quantum simulation and quantum gravity. Recently, the exact number of gauge-invariant states was computed for pure gauge theories on arbitrary lattices. In this work, we generalize this counting to include the case of scalar and fermionic matter, as well as various kinds of boundary conditions. As a byproduct, we consider several related questions, such as the implementation of charge conjugation for a generic finite group. These resu…

Apparatus for quantum-mixture research in microgravity
Baptist Piest, Jonas B\"ohm, Timoth\'e Estrampes, Annie Pichery, Pawe{\l} Arciszewski, Wolfgang Bartosch, S\"oren Boles, Klaus D\"oringshoff, Michael Elsen, Priyanka Guggilam, Ortwin Hellmig, Christian K\"urbis, Dorthe Leopoldt, Gabriel M\"uller, Alexandros Papakonstantinou, Christian Reichelt, Andr\'e Wenzlawski, Thijs Wendrich, \'Eric Charron, Achim Peters, Klaus Sengstock, Andreas Wicht, Patr…

Apparatus for quantum-mixture research in microgravity
Experiments with ultracold quantum gases are a rapidly advancing research field with many applications in fundamental physics and quantum technology. Here, we report on a high-flux generation of Bose-Einstein condensate mixtures of $^{41}$K and $^{87}$Rb, using a fully integrated sounding rocket setup. We investigate the release and the free expansion of the quantum mixtures for different orientations to gravity. The release dynamics are governed by the mixture interactions as well as the decay…

Basis-independent coherence and its distribution in de Sitter spacetime
Samira Elghaayda, Atta ur Rahman, Mostafa Mansour
https://arxiv.org/abs/2510.02581 https://

Basis-independent coherence and its distribution in de Sitter spacetime
Quantum coherence in curved spacetime offers a fresh window into the interplay between gravity, thermality, and quantum resources. While previous work has shown that Markovian evolution can generate entanglement and other nonclassical correlations in de Sitter backgrounds, the basis-dependent nature of coherence has so far limited its unambiguous interpretation. Here, we introduce a basis-independent framework to quantify not only the total coherence of two comoving detectors, but also its coll…

Stringy algebras, stretched horizons, and quantum-connected wormholes
Aidan Herderschee, Jonah Kudler-Flam
https://arxiv.org/abs/2510.01556 https://arxiv.o…

Stringy algebras, stretched horizons, and quantum-connected wormholes
While the supergravity limit of AdS/CFT has been extensively explored, the regime in which stringy dynamics dominate, characterized by the emergence of an infinite tower of higher-spin massive modes, is far less understood. In this work, we leverage techniques from algebraic quantum field theory to investigate the extent to which hallmark features of bulk gravity survive at finite string tension and the emergence of intrinsically stringy phenomena. Working in the $g_s\rightarrow 0$ limit, we mo…

Learning with errors may remain hard against quantum holographic attacks
Yunfei Wang, Xin Jin, Junyu Liu
https://arxiv.org/abs/2509.22833 https://arxiv.org…

Learning with errors may remain hard against quantum holographic attacks
The Learning with Errors (LWE) problem underlies modern lattice-based cryptography and is assumed to be quantum hard. Recent results show that estimating entanglement entropy is as hard as LWE, creating tension with quantum gravity and AdS/CFT, where entropies are computed by extremal surface areas. This suggests a paradoxical route to solving LWE by building holographic duals and measuring extremal surfaces, seemingly an easy task. Three possible resolutions arise: that AdS/CFT duality is intr…

Quantum-Corrected $\phi^{4}$ Inflation in Light of ACT Observations
Jureeporn Yuennan, Peeravit Koad, Farruh Atamurotov, Phongpichit Channuie
https://arxiv.org/abs/2508.17263 ht…

Quantum-Corrected $ϕ^{4}$ Inflation in Light of ACT Observations
Recent measurements from the Atacama Cosmology Telescope (ACT), combined with Planck and DESI data, suggest a scalar spectral index $n_s$ higher than the Planck 2018 baseline, thereby placing conventional attractor-type inflationary models such as Starobinsky $R^2$ and Higgs inflation under increasing tension at the $\gtrsim 2σ$ level. In this work, we examine quantum-corrected $ϕ^4$ inflation with a non-minimal coupling to gravity. Introducing an anomalous scaling parameter $γ$ to capture q…

Loop Quantum Vector-Tensor Gravity and Its Spherically Symmetric Model
Shengzhi Li, Yongge Ma
https://arxiv.org/abs/2509.02056 https://arxiv.org/pdf/2509.0…

Loop Quantum Vector-Tensor Gravity and Its Spherically Symmetric Model
The Hamiltoinian analysis of the vector-tensor theory of gravity is performed. The resulting geometrical dynamics is reformulated into the connection dynamics, with the real SU(2)-connection serving as one of the configuration variables. This formulation allows us to extend the loop quantization scheme of general relativity to the vector-tensor theory, thereby rigorously constructing its quantum kinematical framework. The scalar constraint is promoted to a well-defined operator in the vertex Hi…

Recent developments in semiclassical gravity
Benito A. Ju\'arez-Aubry
https://arxiv.org/abs/2509.02051 https://arxiv.org/pdf/2509.02051

Recent developments in semiclassical gravity
Semiclassical gravity (SG) aims to describe the semiclassical regime of quantum gravity. In SG quantum fields curve classical spacetime in an effective way through the expectation value of their stress-energy tensor, while propagating in the spacetime they curve. I discuss some advances in SG in three directions: (i) in understanding structural properties or special solutions of SG in spacetimes with isometries or special Hadamard states (ii) in understanding the initial value formulation and (…

Abelian 3D TQFT gravity, ensemble holography and stabilizer states
Nikolaos Angelinos
https://arxiv.org/abs/2509.26052 https://arxiv.org/pdf/2509.26052

Abelian 3D TQFT gravity, ensemble holography and stabilizer states
We construct a model of 3D quantum gravity based on abelian topological quantum field theory (TQFT), by defining the gravitational path-integral as a sum over all 3D topologies with genus-$g$ boundary $Σ_g$. The path-integral of an abelian TQFT $\mathcal T$ on any single topology with boundary $Σ_g$ prepares a stabilizer state. This way, $\mathcal T$ partitions all these topologies into finitely many equivalence classes, where each topology within a class is associated with the same stabilize…

Exotic PeVatrons as sources of ultra-high-energy gamma rays
Andrea Addazi, Salvatore Capozziello, Qingyu Gan
https://arxiv.org/abs/2510.00254 https://arxiv…

Exotic PeVatrons as sources of ultra-high-energy gamma rays
We explore novel classes of exotic astrophysical sources capable of producing ultra-high-energy gamma rays extending beyond the PeV scale, motivated by quantum gravity scenarios and dark matter phenomenology. These sources include: ultra-spinning black hole vortex-string systems; exotic compact objects such as boson star, axion star and Q-ball. Such Exotica generate powerful magnetic fields through interactions with millicharged dark matter, enabling particle acceleration mechanisms that surpas…

Correction to Hawking radiation in non-singular gravitational collapse
Hassan Mehmood
https://arxiv.org/abs/2509.03723 https://arxiv.org/pdf/2509.03723

Correction to Hawking radiation in non-singular gravitational collapse
Recent studies have shown that quantum gravity introduces important corrections to the process of spherically symmetric gravitational collapse expected from general relativity. In particular, instead of falling into a central singularity, the collapsing body undergoes a bounce and eventually exits its Schwarzschild radius, and this entire process of collapse and rebound can occur in a single asymptotic region. In this paper, particle creation during such non-singular gravitational collapse is s…

Dynamical Quantum Multigraphs
Kassahun H. Betre, Nathan Lewis
https://arxiv.org/abs/2509.08296 https://arxiv.org/pdf/2509.08296

Dynamical Quantum Multigraphs
Motivated by applications in background-independent quantum gravity, we discuss the quantization of labeled and unlabeled finite multigraphs with a maximum edge count. We provide a unified way to represent quantum multigraphs with labeled or unlabeled vertices, which enables the study of quantum multigraphs as dynamical microscopic degrees of freedom and not just as representations of relations among quantum states of particles. The quantum multigraphs represent a quantum mechanical treatment o…

Operator Algebras and Third Quantization
Yidong Chen, Marius Junge, Nima Lashkari
https://arxiv.org/abs/2509.02293 https://arxiv.org/pdf/2509.02293

Operator Algebras and Third Quantization
In quantum gravity, the gravitational path integral involves a sum over topologies, representing the joining and splitting of multiple universes. To account for topology change, one is led to allow the creation and annihilation of closed and open universes in a framework often called third quantization or universe field theory. We argue that since topology change in gravity is a rare event, its contribution to exponentially late-time physics is universally described by a Poisson process. This u…

Strong random unitaries and fast scrambling
Thomas Schuster, Fermi Ma, Alex Lombardi, Fernando Brandao, Hsin-Yuan Huang
https://arxiv.org/abs/2509.26310 https://

Strong random unitaries and fast scrambling
Understanding how fast physical systems can resemble Haar-random unitaries is a fundamental question in physics. Many experiments of interest in quantum gravity and many-body physics, including the butterfly effect in quantum information scrambling and the Hayden-Preskill thought experiment, involve queries to a random unitary $U$ alongside its inverse $U^\dagger$, conjugate $U^*$, and transpose $U^T$. However, conventional notions of approximate unitary designs and pseudorandom unitaries (PRUs…

Asymptotically safe quantum gravity: functional and lattice perspectives
Marc Schiffer
https://arxiv.org/abs/2509.26352 https://arxiv.org/pdf/2509.26352

Asymptotically safe quantum gravity: functional and lattice perspectives
Asymptotically safe quantum gravity is a candidate theory to quantum gravity, which could unify the gravitational interaction with particle physics. It is characterized by quantum scale-symmetry at high energies. The constraining power of scale symmetry could be strong enough to even explain some parameters of the Standard Model of particle physics from first principles.

Quantum nature of gravity in self-bound quantum droplets
Asma Tahar Taiba, Abdelaali Boudjemaa
https://arxiv.org/abs/2508.12838 https://arxiv.org/pdf/2508.…

Quantum nature of gravity in self-bound quantum droplets
We explore the possibility of testing the quantum nature of the gravitational field with an ultracold self-bound quantum droplet of one-dimensional Bose-Bose mixtures. To this end, we solve variationally and numerically the underlying generalized Gross-Pitaevskii equation which includes the effects of quadratic and cubic nonlinearities. We derive the associated generalized uncertainty principle and its corresponding minimal length. The obtained modified uncertainty relation enables us to search…

Geodesics in Quantum Gravity
Benjamin Koch, Ali Riahinia, Angel Rincon
https://arxiv.org/abs/2510.00117 https://arxiv.org/pdf/2510.00117

Geodesics in Quantum Gravity
We investigate the motion of test particles in quantum-gravitational backgrounds by introducing the concept of q--desics, quantum-corrected analogs of classical geodesics. Unlike standard approaches that rely solely on the expectation value of the spacetime metric, our formulation is based on the expectation value of quantum operators, such as the the affine connection-operator. This allows us to capture richer geometric information. We derive the q--desic equation using both Lagrangian and Ham…

New Tests of Low-Scale Quantum Gravity with Cosmic-Ray Collisions
Manuel Ettengruber, Gonzalo Herrera
https://arxiv.org/abs/2510.11879 https://arxiv.org/pd…

New Tests of Low-Scale Quantum Gravity with Cosmic-Ray Collisions
Cosmic ray collisions at high center of mass energy could enable graviton and black hole production as expected in theories of low-scale quantum gravity, such as extra-dimensions, many species, or some versions of string theory. Here we propose three novel phenomenological tests of these theories. We first consider the collision of cosmic rays with ambient protons, electrons and photons in Active Galactic Nuclei (AGN), finding that high-energy neutrino data from the blazar TXS 0506+056 places a…

Universality of free fall in Planck-scale deformed Newtonian gravity
Giuseppe Fabiano, Domenico Frattulillo, Christian Pfeifer, Fabian Wagner
https://arxiv.org/abs/2510.02046 ht…

Universality of free fall in Planck-scale deformed Newtonian gravity
The universality of free fall is one of the most cherished principles in classical gravity. Its fate in the quantum world is one of the key questions in fundamental physics. We investigate the universality of free fall in the context of Planck scale modifications of Newtonian gravity. Starting from a doubly-special-relativity setting we take the Newtonian limit to obtain deformed Galilean relativity. We study the interaction between two test particles, subject to deformed Galilean relativity, a…

Black Hole Entropy and Complexity Growth in Horndeski Gravity within the AdS/BCFT Framework
Fabiano F. Santos, Behnam Pourhassan, Emmanuel N. Saridakis
https://arxiv.org/abs/2509.23430

Black Hole Entropy and Complexity Growth in Horndeski Gravity within the AdS/BCFT Framework
This work investigates the connection between quantum complexity and gravitational dynamics within the framework of Horndeski gravity, extending the AdS/BCFT correspondence to include scalar-tensor interactions. By refining the ``\(complexity = action\)'' conjecture we investigate how Horndeski gravity modifies the Wheeler-DeWitt patch and the causal structure of the black hole. Our analysis reveals that the linear growth of complexity, proportional to the product of black hole entropy and temp…

Quantum speed limit as a sensitive probe of Planck-scale effects
Salman Sajad Wani, Saif Al-Kuwari
https://arxiv.org/abs/2510.00057 https://arxiv.org/pdf/2…

Quantum speed limit as a sensitive probe of Planck-scale effects
Many quantum-gravity scenarios predict a minute modification of the canonical commutator, known as the generalized uncertainty principle (GUP), whose low-energy signatures are, in principle, accessible to state-of-the-art laboratory tests. We compute first-order minimal-length corrections to the quantum speed limit (QSL) for three cases: uniform superpositions in an infinite square well, coherent harmonic-oscillator states, and squeezed-oscillator states. We identify a universal amplification l…

Quantum control of Nitrogen-Vacancy spin in Diamonds: Towards matter-wave interferometry with massive objects
N. Levi, O. Feldman, Y. Rosenzweig, D. Groswasser, A. Elgarat, M. Gal-Katizri, R. Folman
https://arxiv.org/abs/2508.15504

Quantum control of Nitrogen-Vacancy spin in Diamonds: Towards matter-wave interferometry with massive objects
Quantum mechanics (QM) and General relativity (GR), also known as the theory of gravity, are the two pillars of modern physics. A matter-wave interferometer with a massive particle can test numerous fundamental ideas, including the spatial superposition principle - a foundational concept in QM - in previously unexplored regimes. It also opens the possibility of probing the interface between QM and GR, such as testing the quantization of gravity. Consequently, there exists an intensive effort to…

Finite Entropy Implies Finite Dimension in Quantum Gravity
T. Banks
https://arxiv.org/abs/2509.17856 https://arxiv.org/pdf/2509.17856

Finite Entropy Implies Finite Dimension in Quantum Gravity
Quantum Field Theory (QFT) introduced us to the notion that a causal diamond in space-time corresponded to a subsystem of a quantum mechanical system defined on the global space-time. Work by Jacobson\cite{ted95}, Fischler and Susskind\cite{fs} and particularly Bousso\cite{bousso} suggested that in the quantum theory of gravity this subsystem should have a density matrix of finite entropy. These authors formalized older intuitive arguments based on black hole physics. Although mathematically, T…

Photon helicity asymmetry and duality anomaly in rotating waveguides
Adrian del Rio
https://arxiv.org/abs/2509.01718 https://arxiv.org/pdf/2509.01718

Photon helicity asymmetry and duality anomaly in rotating waveguides
In quantum field theory, photon pairs can be excited out of the vacuum under the influence of dynamical gravitational fields. If the classical electromagnetic duality symmetry held at the quantum level, equal numbers of right- vs left-handed modes would be excited. However, a quantum chiral-like anomaly is known to affect this symmetry. In this work, we explore more experimentally accessible manifestations of this anomaly in analogue-gravity systems. Specifically, we describe the physical mecha…

Restricted Phase Space Thermodynamics of Charged Static and Charged Rotating Black Holes in $f(R)$ Gravity
Amijit Bhattacharjee, Prabwal Phukon
https://arxiv.org/abs/2509.21146 …

Restricted Phase Space Thermodynamics of Charged Static and Charged Rotating Black Holes in $f(R)$ Gravity
The thermodynamics of black holes provides a profound link between gravity, quantum theory and statistical mechanics. It serves as a useful tool for testing theories beyond Einstein's gravity. In this work of ours, we investigate the newly found restricted phase space thermodynamics (RPST) of charged static and charged rotating black holes in $f(R)$ gravity. Unlike the extended phase space (EPST) approach, RPST keeps the cosmological constant fixed and introduces the central charge $C$ along wi…

Simulating Mass-Dependent Decoherence in Quantum Computers: Baseline Signatures for Testing Gravity-Induced Collapse
Viswak R Balaji, Samuel Punch
https://arxiv.org/abs/2508.10590

Simulating Mass-Dependent Decoherence in Quantum Computers: Baseline Signatures for Testing Gravity-Induced Collapse
We present a quantum computing simulation study of mass-dependent decoherence models inspired by Penrose's gravity-induced collapse hypothesis. According to objective reduction (OR) theory, quantum superpositions become unstable when the gravitational self-energy difference between branches exceeds a certain threshold, leading to a collapse time $τ\approx \hbar / E_G$. In this work, we implement a mass-dependent dephasing noise channel, $p(m) = 1 - e^{-k m^α}$, within the Qiskit AerSimulator,…

Radiative and Jet Signatures of Regular Black Holes in Quantum-Corrected Gravity
Chirantana Bhattacharjee, Subhadip Sau, Avijit Mukherjee
https://arxiv.org/abs/2509.26366 https:…

Radiative and Jet Signatures of Regular Black Holes in Quantum-Corrected Gravity
We investigate regular rotating black holes predicted by asymptotically safe gravity, where the Newton constant varies with energy scale and modifies the near horizon geometry. These solutions remain asymptotically flat and avoid central singularities while differing from the classical Kerr spacetime in the strong field region. We compute the radiative efficiency of thin accretion disks and the jet power from the Blandford Znajek mechanism, both of which depend on the deformation parameter of t…

Free-Particle State Realized via Optimal Filtering in Optomechanics: Implications for Gravity-Induced Entanglement
Ryotaro Fukuzumi, Kosei Hatakeyama, Daisuke Miki, Kazuhiro Yamamoto
https://arxiv.org/abs/2508.14337

Free-Particle State Realized via Optimal Filtering in Optomechanics: Implications for Gravity-Induced Entanglement
We analyze the conditional quantum state of a mechanical mirror in an optomechanical system under continuous measurement, feedback control, and quantum filtering. Our study identifies a regime in which the mirror's momentum is squeezed beyond the standard quantum limit achievable through appropriate tuning of the homodyne detection angle. We show that in this regime, optimal filtering effectively realizes a free-particle-like state. Notably, when applied to a setup involving two optomechanical …

Constraints on quantum Oppenheimer-Snyder black holes with eccentric extreme mass-ratio inspirals
Sen Yang, Yu-Peng Zhang, Li Zhao, Yu-Xiao Liu
https://arxiv.org/abs/2509.24835 …

Constraints on quantum Oppenheimer-Snyder black holes with eccentric extreme mass-ratio inspirals
We investigate the potential of extreme mass-ratio inspirals to constrain quantum Oppenheimer-Snyder black holes within the framework of loop quantum gravity. We consider a stellar-mass object orbiting a supermassive Oppenheimer-Snyder black hole in an equatorial eccentric trajectory. To explore the dynamical behavior of the system, we analyze its orbital evolution under gravitational radiation within the adiabatic approximation and the mass-quadrupole formula for different initial orbital conf…

Loopy Black-Hole Remnants
Asier Alonso-Bardaji
https://arxiv.org/abs/2508.21159 https://arxiv.org/pdf/2508.21159 …

Loopy Black-Hole Remnants
The quantized area predicted by loop quantum gravity suggests the existence of a lower bound for black-hole horizons. We prove this intuition within a covariant effective model for spherical loop quantum gravity, where nonsingular quasi-static black holes evaporate until their horizons attain the smallest positive eigenvalue of the area operator. Consistent with the third law of black-hole thermodynamics, this final state -- characterized by vanishing temperature and entropy -- cannot be realiz…

Quantum Properties of Non-Dirichlet Boundary Conditions in Gravity
Patrick Draper, Manthos Karydas, Hao Zhang
https://arxiv.org/abs/2509.16190 https://arxi…

Quantum Properties of Non-Dirichlet Boundary Conditions in Gravity
The Euclidean path integral for gravity is enriched by the addition of boundaries, which provide useful probes of thermodynamic properties. Common boundary conditions include Dirichlet conditions on the boundary induced metric; microcanonical conditions, which refers to fixing some components of the Brown-York boundary stress tensor; and conformal conditions, in which the conformal structure of the induced metric and the trace of the extrinsic curvature are fixed. Boundaries also present intere…

ER = EPR in Loop Quantum Gravity: the Immirzi Parameter and the Continuum Limit
Fabrizio Tamburini
https://arxiv.org/abs/2508.18324 https://arxiv.org/pdf/2…

ER = EPR in Loop Quantum Gravity: the Immirzi Parameter and the Continuum Limit
We recast the finite-region analysis of Einstein's equations that underpins the ER=EPR program into the loop quantum gravity (LQG) framework. By translating curvature-energy uncertainty relations into holonomy-flux kinematics, and by identifying Planckian Einstein-Rosen throats with single-puncture cuts through spin networks, we obtain a precise dictionary between entanglement and quantum geometry. Within this dictionary we derive the Barbero-Immirzi parameter directly from the entanglement/are…

TASI lectures on Matrix Theory from a modern viewpoint
Henry W. Lin
https://arxiv.org/abs/2508.20970 https://arxiv.org/pdf/2508.20970

TASI lectures on Matrix Theory from a modern viewpoint
These notes review the D0-brane or Banks-Fischler-Shenker-Susskind (BFSS) matrix quantum mechanics from a post-AdS/CFT perspective. We start from the decoupling argument for D0-branes and discuss the gravity dual in the 't Hooft regime, before extrapolating to strong coupling. In the second part of these notes, we review the matrix bootstrap method and its application to the D0-brane quantum mechanics.

Quasinormal ringing and Unruh-Verlinde temperature of the Frolov Black Hole
Akshat Pathrikar
https://arxiv.org/abs/2510.01376 https://arxiv.org/pdf/2510.01…

Quasinormal ringing and Unruh-Verlinde temperature of the Frolov Black Hole
In this study, we investigate electromagnetic and Dirac field axial-perturbations of a charged regular black hole arising from quantum gravity effects, commonly referred to as the Frolov black hole, a regular (nonsingular) black hole solution. We derive the master wave equations for massless electromagnetic and Dirac perturbations and solve them using the standard Wentzel-Kramers-Brillouin (WKB) method along with Padé approximation. From these solutions, we extract the dominant and overtone qu…

Dynamical Triangulations for 2D Pure Gravity and Topological Recursion
Hiroyuki Fuji, Masahide Manabe, Yoshiyuki Watabiki
https://arxiv.org/abs/2509.18916 https://

Dynamical Triangulations for 2D Pure Gravity and Topological Recursion
We show that, in two-dimensional Euclidean quantum gravity without matter fields, the Schwinger-Dyson equations derived within the Hamiltonian framework of non-critical string field theory can be reformulated in terms of the Chekhov-Eynard-Orantin topological recursion, and we explicitly compute the associated low-order amplitudes. In particular, we establish this reformulation for two discrete models -- the basic type and the strip type -- as well as for the continuum limit of dynamical triang…

Neutralization of Levitated Charged Nanodiamond: Towards matter-wave interferometry with massive objects
Sela Liran, Or Dobkowski, Rafael Benjaminov, Peter Skakunenko, Michael Averbukh, Yaniv Bar-Haim, David Groswasser, Joshua H. Baraban, Ron Folman
https://arxiv.org/abs/2508.15625

Neutralization of Levitated Charged Nanodiamond: Towards matter-wave interferometry with massive objects
Quantum mechanics (QM) and General relativity (GR), also known as the theory of gravity, are the two pillars of modern physics. A matter-wave interferometer with a massive particle, can test numerous fundamental ideas, including the spatial superposition principle - a foundational concept in QM - in completely new regimes, as well as the interface between QM and GR, e.g., testing the quantization of gravity. Consequently, there exists an intensive effort to realize such an interferometer. While…

Replaced article(s) found for gr-qc. https://arxiv.org/list/gr-qc/new
[1/2]:
- Status of Birkhoff's theorem in polymerized semiclassical regime of Loop Quantum Gravity
Luca Cafaro, Jerzy Lewandowski

The holographic dual of the GHZ state
Libo Jiang, Yan Liu
https://arxiv.org/abs/2508.17898 https://arxiv.org/pdf/2508.17898

The holographic dual of the GHZ state
Current holographic research mostly focuses on a subset of quantum systems with a classical gravity dual. Although the precise boundary of this subset remains unknown, certain constraints are recognized; for instance, holographic entropies obey inequalities that are violated by general quantum states such as the GHZ states. This paper, however, presents a gravity dual for GHZ states -- a non-ordinary geometry termed the booklet wormhole. We demonstrate an exact match for all entropy properties …

Quantum corrections to Dymnikova-Schwinger black holes in Einstein-Gauss-Bonnet gravity
A. Errehymy, Y. Khedif, M. Daoud, K. Myrzakulov, B. Turimov, T. Myrzakul
https://arxiv.org/abs/2509.17630

Quantum corrections to Dymnikova-Schwinger black holes in Einstein-Gauss-Bonnet gravity
This work investigates black holes within a modified framework of gravity that incorporates quantum-inspired corrections and a fundamental minimal length scale. By integrating Einstein-Gauss-Bonnet gravity with a specially tailored matter source that models quantum particle creation, we derive novel, non-singular black hole solutions. These black holes exhibit rich horizon structures and, notably, do not undergo complete evaporation -- instead, they stabilize into permanent remnants. In additio…

An Unfinished Collaboration with A. A. Starobinsky
Thibault Damour
https://arxiv.org/abs/2509.00558 https://arxiv.org/pdf/2509.00558

An Unfinished Collaboration with A. A. Starobinsky
The present text summarizes some of the results obtained in 2008 during the initial stages of a collaboration with Starobinsky which remained unfinished. The collaboration was an attempt to apply the stochastic approach to infrared (IR) quantum-gravity effects in an inflationary spacetime.

Emergent classical gravity as stress-tensor deformed field theories
Yun-Ze Li, Yunfei Xie, Song He
https://arxiv.org/abs/2508.15461 https://arxiv.org/pdf/2…

Emergent classical gravity as stress-tensor deformed field theories
We introduce a framework in which classical gravity arises from stress-tensor deformations of quantum field theories (QFTs). By expressing the deformed partition function as a gravitational path integral, we propose an equivalent description between a seed QFT coupled to gravity and an effective field theory defined on a deformation-induced metric. This approach, which does not rely on holography or extra dimensions, applies to a variety of gravitational models, including Einstein and Palatini …

On Stability and Isotropization of Kasner Solution in $R^{2}$ Gravity
Dmitri Pogosyan, Akash Kav
https://arxiv.org/abs/2509.25470 https://arxiv.org/pdf/250…

On Stability and Isotropization of Kasner Solution in $R^{2}$ Gravity
The fate of the Universe that initially expands anisotropically in the theory with $R^{2}$ quantum-gravitational term in the Lagrangian is investigated. The stability of Kasner-like expansion, specifically in the class of Kantowski-Sachs spacetimes, is analyzed. Kasner solutions are found to be unstable, with the bifurcation line between the initial conditions that lead to collapsing universes and the ones that set the universe for continuing expansion that becomes isotropic, established analyt…

Strong Confinement of a Nanoparticle in a Needle Paul Trap: Towards Matter-Wave Interferometry with Nanodiamonds
Peter Skakunenko, Daniel Folman, Yaniv Bar-Haim, Ron Folman
https://arxiv.org/abs/2508.14272

Strong Confinement of a Nanoparticle in a Needle Paul Trap: Towards Matter-Wave Interferometry with Nanodiamonds
Quantum mechanics (QM) and General relativity (GR), also known as the theory of gravity, are the two pillars of modern physics. A matter-wave interferometer with a massive particle, can test numerous fundamental ideas, including the spatial superposition principle - a foundational concept in QM - in completely new regimes, as well as the interface between QM and GR, e.g., testing the quantization of gravity. Consequently, there exists an intensive effort to realize such an interferometer. While…

Cut-off scale of quantum gravity
Asya Aynbund, V. V. Kiselev
https://arxiv.org/abs/2508.11293 https://arxiv.org/pdf/2508.11293

Cut-off scale of quantum gravity
Dynamics of gravity interaction with matter at one-loop level of effective quantum field theory naturally sets the cut-off scale $Λ_E$ in a sub-Planckian region through incorporating the gauge coupling constant $α(Λ_E)$ and the reduced Planckian mass $\tilde m_\text{pl}$ into relation $ Λ_E\sim \tilde m_\text{pl}\,α(Λ_E)/(4π)$ numerically yielding $Λ_E\sim 10^{16}$ GeV. Such two scales are empirically inherent for an inflationary cosmology.

Gravitational baryogenesis in $F(R)$ gravity's rainbow
Parviz Goodarzi
https://arxiv.org/abs/2508.16955 https://arxiv.org/pdf/2508.16955

Gravitational baryogenesis in $F(R)$ gravity's rainbow
We investigate the gravitational baryogenesis scenario within the context of $F(R)$ gravity's rainbow which incorporates both modified gravity and energy-dependent spacetime. This study explores a mechanism for generating baryon asymmetry based on the interaction between the derivative of the Ricci scalar $R$ and the baryon current within the framework of $F(R)$ gravity's rainbow. The rainbow functions, arising from quantum gravity effects, modify the gravitational interaction and the Friedmann…

From negative to positive $\Lambda$ through cosmological decreasing temperatures and its connection to spacetime foliation and string theory
E. N. Nyergesy, I. G. M\'ari\'an, A. Trombettoni, I. N\'andori
https://arxiv.org/abs/2510.02244

From negative to positive $Λ$ through cosmological decreasing temperatures and its connection to spacetime foliation and string theory
String theories naturally predict a negative, while observations on the exponential expansion of the present Universe requires a positive value for the cosmological constant $Λ$. Solution to resolve this discrepancy is known in the framework of string theory and given for Asymptotically Safe (AS) quantum gravity by using Renormalization Group (RG). However, the former might describes unstable worlds and the latter lacks the inclusion of temperature which is otherwise crucial in the early Unive…

Design of high-efficiency UHV loading of nanodiamonds into a Paul trap: Towards Matter-Wave Interferometry with Massive Objects
Rafael Benjaminov, Sela Liran, Or Dobkowski, Yaniv Bar-Haim, Michael Averbukh, Ron Folman
https://arxiv.org/abs/2508.14722

Design of high-efficiency UHV loading of nanodiamonds into a Paul trap: Towards Matter-Wave Interferometry with Massive Objects
Quantum mechanics (QM) and General relativity (GR), also known as the theory of gravity, are the two pillars of modern physics. A matter-wave interferometer with a massive particle, can test numerous fundamental ideas, including the spatial superposition principle - a foundational concept in QM - in completely new regimes, as well as the interface between QM and GR, e.g., testing the quantization of gravity. Consequently, there exists an intensive effort to realize such an interferometer. While…

Mind the crosscap: $\tau$-scaling in non-orientable gravity and time-reversal-invariant systems
Gabriele Di Ubaldo, Altay Etkin, Felix M. Haehl, Moshe Rozali
https://arxiv.org/abs/2509.20448

Mind the crosscap: $τ$-scaling in non-orientable gravity and time-reversal-invariant systems
Spectral statistics of quantum chaotic systems are governed by random matrix universality. In many cases of interest, time-reversal symmetry selects the Gaussian Orthogonal Ensemble (GOE) as the relevant universality class. In holographic CFTs, this is mirrored by the presence of non-orientable geometries in the dual gravitational path integral. In this work, we analyze general properties of these matrix models and their gravitational counterparts. First, we develop a formalism to express the u…

Quantum Gravity and Inflation as an Open System: A New Paradigm
Alan Sebasti\'an Morales, Mauricio Bellini, Juan Ignacio Musmarra
https://arxiv.org/abs/2509.19507 https://…

Quantum Gravity and Inflation as an Open System: A New Paradigm
As part of our program to develop a general theory of relativity for open systems, we introduce a covariant theory that incorporates the effects of classical and quantum spacetime alterations in a new metric tensor that effectively includes these alterations, thereby generating a Riemannian manifold from a new varied action without boundary terms. We illustrate the theory by studying an inflationary model which incorporates the quantum feedback effects of spacetime on the dynamics of the inflat…

Trapping and cooling of nanodiamonds in a Paul trap under ultra-high vacuum: Towards matter-wave interferometry with massive objects
Omer Feldman, Ben Baruch Shultz, Maria Muretova, Or Dobkowski, Yonathan Japha, David Grosswasser, Ron Folman
https://arxiv.org/abs/2508.14687

Trapping and cooling of nanodiamonds in a Paul trap under ultra-high vacuum: Towards matter-wave interferometry with massive objects
Quantum mechanics (QM) and General relativity (GR), also known as the theory of gravity, are the two pillars of modern physics. A matter-wave interferometer with a massive particle can test numerous fundamental ideas, including the spatial superposition principle - a foundational concept in QM - in previously unexplored regimes. It also opens the possibility of probing the interface between QM and GR, such as testing the quantization of gravity. Consequently, there exists an intensive effort to…

Thermodynamics of BTZ Black Holes in Bumblebee Gravity with Barrow Entropy with Cavity-Modification
H. Kaur, Prince A Ganai
https://arxiv.org/abs/2509.22129 https://

Thermodynamics of BTZ Black Holes in Bumblebee Gravity with Barrow Entropy with Cavity-Modification
We investigate the thermodynamics of $(2+1)$ dimensional BTZ black holes in the Einstein bumblebee gravity theory with spontaneous breaking of Lorentz symmetry caused by a nonzero vacuum expectation value of the vector field. We analyse corrections to black hole thermodynamics, including the non extensive Barrow entropy, parametrising quantum gravitational corrections to the Bekenstein Hawking area law. We introduce the York cavity formalism by placing the black hole in a finite isothermal cavi…

Yukawa interactions in Quantum Gravity
Gustavo P. de Brito, Manuel Reichert, Marc Schiffer
https://arxiv.org/abs/2510.09572 https://arxiv.org/pdf/2510.0957…

Yukawa interactions in Quantum Gravity
We present the first complete next-to-leading-order analysis of a Yukawa system within the framework of asymptotically safe quantum gravity. Our results are obtained through a systematic resummation of higher-order operators, revealing two distinct resummation mechanisms -- one of which has not been explored previously. In addition, we introduce a novel approach to estimate systematic uncertainties by simulating the impact of neglected higher-order contributions. We demonstrate that quantum g…

Quantum nature of gravitational waves from binary black holes
Sugumi Kanno, Jiro Soda, Akira Taniguchi
https://arxiv.org/abs/2508.17947 https://arxiv.org/p…

Quantum nature of gravitational waves from binary black holes
Quantum mechanics is the fundamental framework of nature, and gravitational waves from binary black holes should likewise be analyzed quantum mechanically. It is commonly assumed that their classical description corresponds to a coherent state, so any deviation would signal genuinely quantum nature of gravity. We show that the coherent-state description reproduces classical gravitational waves at leading order, while next-order effects generate squeezed states of gravitons. For GW150914, we est…

Quantum Dynamics and Elementary Excitations in Superfluid He4 Films at Low Temperatures
Vladimir I. Kruglov, Houria Triki
https://arxiv.org/abs/2509.09137 https://

Quantum Dynamics and Elementary Excitations in Superfluid He4 Films at Low Temperatures
We have formulated a novel quantum nonlinear Schrodinger equation describing of superfluid He4 in films at low temperatures. It is shown that in classical limit the found nonlinear Schrodinger equation reduces to a system of equations which are equivalent to Boussinesq equations describing the propagation of long gravity waves in incompressible fluids. This nonlinear Schrodinger equation leads to phonon-roton dispersion relation for elementary excitations in superfluid He4 films at low …

Cyclic Kruskal Universe: a quantum-corrected Schwarzschild black hole in unitary unimodular gravity
Steffen Gielen, Sofie Ried
https://arxiv.org/abs/2509.18273 https://

Fixed points of classical gravity coupled with a Standard-Model-like theory
Latham Boyle, Neil Turok, Vatsalya Vaibhav
https://arxiv.org/abs/2509.09346 https://

Fixed points of classical gravity coupled with a Standard-Model-like theory
Coupling quantum field theory (QFT) \!-\! even free QFT \!-\! to gravity leads to well-known problems. In particular, the stress tensor $T_{μν}$ (gravity's source) and its correlators typically diverge in the UV, creating a conflict between the wildly inhomogeneous spacetime we expect quantum mechanically and the weakly-curved, macroscopic spacetime we observe. Are there QFTs for which these divergences cancel? Here, for simplicity, we consider free quantum fields on a classical curved backgr…

Euclidean Correlation Functions in Quantum Gravity
Jack Laiho, Kenny Ratliff
https://arxiv.org/abs/2510.11888 https://arxiv.org/pdf/2510.11888

Euclidean Correlation Functions in Quantum Gravity
We calculate Euclidean correlation functions through next-to-leading order in the low energy effective theory of gravity. We focus on correlation functions of curvature and volume operators, calculating these functions through one-loop order. We show that quantum fluctuations of the background spacetime must be taken into account in order to obtain gauge invariant expressions, and we point out a subtlety associated with the analytic continuation of the conformal mode. Our final expressions for …

Shadow of black holes with consistent thermodynamics
Che-Yu Chen, Chiang-Mei Chen, Nobuyoshi Ohta
https://arxiv.org/abs/2510.00708 https://arxiv.org/pdf/25…

Shadow of black holes with consistent thermodynamics
Quantum effects in general induce scale dependence in the coupling constants. We explore this possibility in gravity, with a scale-dependent Newton coupling. When applied to Kerr black holes with such a running coupling, the consistency of black hole thermodynamics requires that the Newton coupling have a specific dependence on the black hole parameters. In this work, we consider such a class of Newton couplings and look for the possible observational implications on the highly lensed images of…

Quantum Gravity and Effective Topology
J. van der Duin, R. Loll, M. Schiffer, A. Silva
https://arxiv.org/abs/2510.05695 https://arxiv.org/pdf/2510.05695

Quantum Gravity and Effective Topology
We introduce a new methodology to characterize properties of quantum spacetime in a strongly quantum-fluctuating regime, using tools from topological data analysis. Starting from a microscopic quantum geometry, generated nonperturbatively in terms of dynamical triangulations (DT), we compute the Betti numbers of a sequence of coarse-grained versions of the geometry as a function of the coarse-graining scale, yielding a characteristic ``topological finger print". We successfully implement this m…

Impact of quantum gravity on the UV sensitivity of extremal black holes
Francesco Del Porro, Francesco Ferrarin, Alessia Platania
https://arxiv.org/abs/2509.07058 https://

Impact of quantum gravity on the UV sensitivity of extremal black holes
Recent work has revealed that extremal Kerr black holes may exhibit a sensitivity to higher-derivative corrections to Einstein's equations, displaying singularities in the tidal forces at the horizon. However, in a purely gravitational context, this "ultraviolet sensitivity" translates into a strong dependence on the Wilson coefficients in the low-energy effective field theory. These, in turn, are fixed by the underlying theory of quantum gravity in the ultraviolet. We find a prediction for the…

Imprints of screened dark energy on non-local quantum correlations
Fabiano Feleppa, Gaetano Lambiase, Sunny Vagnozzi
https://arxiv.org/abs/2508.18448 https://

Imprints of screened dark energy on non-local quantum correlations
We investigate how screening mechanisms, reconciling light scalar fields driving cosmic acceleration with local fifth force constraints, can be probed via their impact on non-local quantum correlations between entangled spin pairs, whose evolution on a curved background is affected by General Relativity (GR) and screened modified gravity effects. We consider a gedankenexperiment featuring a pair of massive, spin-1/2 particles orbiting the Earth, evaluating their non-local correlations through s…

Bell states for fermions in loop quantum gravity
Hanno Sahlmann, Martin Zei{\ss}
https://arxiv.org/abs/2508.04704 https://arxiv.org/pdf/2508.04704

Bell states for fermions in loop quantum gravity
Fermion fields are fundamental for the description of nature and also fit very naturally into the framework of loop quantum gravity. Motivated partially by proposals to use gravitationally mediated entanglement of matter as a witness for the quantum nature of gravity, we investigate how such entanglement can be defined and investigated in loop quantum gravity. In particular, we ask how a pair of fermions in a Bell state could be described in loop quantum, gravity. We demonstrate that the noti…

Decoding the string in terms of holographic quantum maps
Avik Chakraborty, Tanay Kibe, Mart\'in Molina, Ayan Mukhopadhyay, Hardik Vamshi
https://arxiv.org/abs/2509.13404 htt…

Decoding the string in terms of holographic quantum maps
It has recently been shown that the Nambu-Goto equation for a string emerges from the junction conditions in three-dimensional gravity. Holographically, gravitational junctions are dual to interfaces in conformal field theory. We demonstrate that each stringy mode of the junction corresponds to a universal $\mathcal{H}_{in}\rightarrow \mathcal{H}_{out}$ quantum map between in and out Hilbert spaces of excitations scattered at the interface, and also a universal $\mathcal{H}_{L}\rightarrow \math…

Singularity Resolution of Quantum Black Holes in (A)dS
Sofie Ried
https://arxiv.org/abs/2508.20794 https://arxiv.org/pdf/2508.20794

Singularity Resolution of Quantum Black Holes in (A)dS
The singularities present at the centre of black holes signal a break down of the classical theory. In this paper, we demonstrate a resolution of the Schwarzschild-(Anti-)de Sitter singularity by imposing unitary evolution with respect to unimodular time. Employing the Henneaux-Teitelboim formulation of unimodular gravity, we perform a canonical quantization on a symmetry-reduced Schwarzschild-(Anti-) de Sitter model. This leads to a Wheeler-DeWitt equation that effectively becomes a Schröding…

Exploring Quantum Spacetime with Topological Data Analysis
J. van der Duin, R. Loll, M. Schiffer, A. Silva
https://arxiv.org/abs/2510.05693 https://arxiv.o…

Exploring Quantum Spacetime with Topological Data Analysis
In a novel application of the tools of topological data analysis (TDA) to nonperturbative quantum gravity, we introduce a new class of observables that allows us to assess whether quantum spacetime really resembles a ``quantum foam" near the Planck scale. The key idea is to investigate the Betti numbers of coarse-grained path integral histories, regularized in terms of dynamical triangulations, as a function of the coarse-graining scale. In two dimensions our analysis exhibits the well-known fr…

Interacting Scalar Field Cosmology from Full Quantum Gravity
Tom R. Ladst\"atter, Luca Marchetti
https://arxiv.org/abs/2508.16194 https://arxiv.org/pd…

Interacting Scalar Field Cosmology from Full Quantum Gravity
We study the relational cosmological dynamics emerging from interacting group field theory (GFT) models minimally coupled to a massless clock scalar field and a self-interacting scalar field. We focus on two broad classes of GFT interactions - pseudosimplicial and pseudotensorial - which generalize simplicial and tensorial interactions, respectively. Treating these interactions perturbatively, we extract the effective cosmological dynamics using mean-field techniques. In the geometric sector, w…

Imprints of quantum vacuum fluctuations on the gravitational field of a spherical mass
Ra\'ul Carballo-Rubio, Francesco Di Filippo, Shinji Mukohyama, Kazumasa Okabayashi
https://arxiv.org/abs/2509.10667

Imprints of quantum vacuum fluctuations on the gravitational field of a spherical mass
The Schwarzschild geometry, describing the gravitational field of a spherical mass in classical vacuum, is one of the most famous vacuum solutions of the Einstein field equations. Classical vacuum is an idealization that does not include quantum vacuum fluctuations of quantum fields, and determining the form of the gravitational field of a spherical mass in quantum vacuum is an important step towards understanding the interplay between gravity and quantum field theory. We formulate and prove ge…

Regular Black Holes from Proper-Time flow in Quantum Gravity and their Quasinormal modes, Shadow and Hawking radiation
Alfio Bonanno, Roman A. Konoplya, Giovanni Oglialoro, Andrea Spina
https://arxiv.org/abs/2509.12469

Regular Black Holes from Proper-Time flow in Quantum Gravity and their Quasinormal modes, Shadow and Hawking radiation
We derive a class of regular black holes from the proper-time renormalization group approach to asymptotically safe gravity. A central challenge is the robustness of physical predictions to the regularization scheme. We address this by computing key observables for our quantum-corrected black holes, which are non-singular and asymptotically Schwarzschild. We calculate the quasinormal mode spectrum, finding significant deviations from the classical case. The Hawking radiation spectrum is strongl…

Quantum Gravity and Entanglement in Particle Physics and Gravitation
Nick E. Mavromatos
https://arxiv.org/abs/2508.08346 https://arxiv.org/pdf/2508.08346…

Quantum Gravity and Entanglement in Particle Physics and Gravitation
Some approaches to Quantum Gravity (QG) entail decoherence of quantum matter propagating in it, due to an ``environment'' of QG degrees of freedom inaccessible to low-energy observers. In the first part of this talk, I discuss potential, and rather unique, effects of QG-induced decoherence on entangled particle states, specifically an induced modification of Einstein-Podolsky-Rosen (EPR) correlations of entangled neutral-meson states in meson factories ($ω$-effect). In the second part, I summa…

Gravitational quasinormal modes of the Hayward spacetime
S. V. Bolokhov, Milena Skvortsova
https://arxiv.org/abs/2508.19989 https://arxiv.org/pdf/2508.1998…

Gravitational quasinormal modes of the Hayward spacetime
We study gravitational quasinormal modes of the Hayward spacetime, a regular black-hole geometry that also admits an interpretation as an effective quantum-corrected solution within asymptotically safe gravity. Using both the higher-order WKB method supplemented with Pade approximants and time-domain integration with Prony analysis, we obtain accurate spectra for axial perturbations and explore the impact of the quantum parameter $γ$. We find that increasing $γ$ systematically raises the osci…

Observable thin accretion disk around a self-dual black hole in loop quantum gravity
Tursunali Xamidov, Javokhir Sharipov, Sanjar Shaymatov
https://arxiv.org/abs/2509.10953 http…

Observable thin accretion disk around a self-dual black hole in loop quantum gravity
In this paper, we study a self-dual black hole (BH) in Loop Quantum Gravity (LQG), analyzing both timelike and null geodesics. Using observational data from Mercury's perihelion shift and the orbit of the S2 star around Sagittarius A$^{\star}$ (Sgr A$^{\star}$), we derive constraints on the polymeric function $P$. We further investigate photon trajectories near the self-dual BH under various scenarios to explore their observational relevance. Finally, we examine the properties of accretion disk…

A novel quantum memory effect and thermal modulation in graviton-mediated entanglement
Mainak Dutta, Partha Nandi, Bibhas Ranjan Majhi
https://arxiv.org/abs/2510.11075 https://

A novel quantum memory effect and thermal modulation in graviton-mediated entanglement
A central challenge in probing the quantum nature of gravity is to distinguish effects that are genuinely quantum from those that can be explained classically. In this work, we study how quantized gravitational waves interact with thermal quantum systems, modeled as harmonic oscillators. We show that, unlike classical waves, quantized gravitons generate entanglement and leave behind a persistent ``graviton-induced quantum memory'' even after the wave has passed. This effect is further shaped by…

Gravitational quasinormal modes of Dymnikova black holes
Bekir Can L\"utf\"uo\u{g}lu, Erdin\c{c} Ula\c{s} Saka, Abubakir Shermatov, Inomjon Ibragimov, Javlon Rayimbaev, Sokhibjan Muminov
https://arxiv.org/abs/2509.24633

Gravitational quasinormal modes of Dymnikova black holes
We investigate gravitational quasinormal modes of the Dymnikova black hole, a regular spacetime in which the central singularity is replaced by a de Sitter core. This geometry, originally proposed as a phenomenological model, also arises naturally in the framework of Asymptotically Safe gravity, where quantum corrections lead to a scale-dependent modification of the Schwarzschild solution. Focusing on axial gravitational perturbations, we compute the dominant quasinormal frequencies using the W…

A spacetime-covariant approach to inertial and accelerated quantum clocks in first-quantization
Eduardo A. B. Oliveira, Andre G. S. Landulfo
https://arxiv.org/abs/2508.05897 htt…

A spacetime-covariant approach to inertial and accelerated quantum clocks in first-quantization
It is expected that a quantum theory of gravity will radically alter our current notion of spacetime geometry. However, contrary to what was commonly assumed for many decades, quantum gravity effects could manifest in scales much larger than the Planck Scale, provided that there is enough coherence in the superposition of geometries. Quantum Clocks, i.e. quantum mechanical systems whose internal dynamics can keep track of proper-time lapses, are a very promising tool for probing such low-energy…

Quantum interference in the Einstein-Maxwell-Scalar spacetime
Yingdong Wu
https://arxiv.org/abs/2509.19381 https://arxiv.org/pdf/2509.19381

Quantum interference in the Einstein-Maxwell-Scalar spacetime
We investigate gravitationally induced interference within the framework of teleparallel gravity, deriving a general expression for the gravitational phase difference and applying it to an EMS spacetime. We then analyze how this phase difference is affected by the presence or absence of black hole charge. Our results show that, irrespective of charge, the dominant contribution to the gravitational phase difference arises from the black hole mass. Nevertheless, while the influence of charge is n…

Strong Gravity Effects on $\mathcal{R}^2$-corrected Single Scalar Field Inflation and Compatibility with the ACT Data
V. K. Oikonomou
https://arxiv.org/abs/2508.17363 https://…

Strong Gravity Effects on $\mathcal{R}^2$-corrected Single Scalar Field Inflation and Compatibility with the ACT Data
In this work we introduce the rescaled $\mathcal{R}^2$-corrected minimally coupled scalar field theory, a theory that contains minimal quantum corrections of the single scalar field Lagrangian. We develop the theoretical framework in the string frame where the baryons geodesics are free fall geodesics and we do not treat the theory as a two scalar field theory in the Einstein frame. The theoretical framework can be reduced to a single scalar field theory framework by using a perturbative expans…

Crosslisted article(s) found for gr-qc. https://arxiv.org/list/gr-qc/new
[1/1]:
- Testing $f(T)$ Gravity with Cosmological Observations: Confronting the Hubble Tension and Implica...
Saurabh Verma, Archana Dixit, Anirudh Pradhan, M. S. Barak

Nonlinear Ringdowns as Sources and Detectors of Quantum Gravitational Waves
Thiago Guerreiro
https://arxiv.org/abs/2508.07348 https://arxiv.org/pdf/2508.07…

Nonlinear Ringdowns as Sources and Detectors of Quantum Gravitational Waves
Is gravity quantum mechanical? If so, we argue that nonlinear effects in black hole ringdowns - notably second harmonic generation - generates gravitational waves in non-classical states. While quantum features of these states such as sub-Poissonian statistics or entanglement could in principle be measured at interferometric detectors, the tiny coupling of gravity to matter makes this extremely challenging. Drawing on ideas from quantum optics, we instead propose that the nonlinearities in ring…

Nonsingular Schwarzschild-de Sitter black holes in finite conformal quantum gravity
Diego A. Mart\'inez-Valera
https://arxiv.org/abs/2510.05466 https://

Nonsingular Schwarzschild-de Sitter black holes in finite conformal quantum gravity
In this work, we prove that the classical Schwarzschild-de Sitter spacetime is an exact solution of a class of weakly non-local, UV finite conformal quantum gravity theories, without the necessity of including a cosmological constant term in the action, thus associating the effective cosmological constant $Λ$ appearing in the metric with the coupling constants of the quantum gravity theory. Furthermore, exploiting the inherent conformal symmetry of the theory, we take advantage of the natural …

Foundational Structure of Local Amplitudes in Quantum Gravity
Charalampos Theofilis, Wolfgang Wieland
https://arxiv.org/abs/2508.09679 https://arxiv.org/pd…

Foundational Structure of Local Amplitudes in Quantum Gravity
There has been recently renewed interest in the quantisation of gravity by considering local subsystems on light-like hypersurfaces. The main purpose of this paper is to present a theory-independent perspective on these developments assuming only basic knowledge of quantum theory and general relativity. In addition, we present a top-down approach to constructing local amplitudes in causal diamonds. The fundamental building block is a slab of light-like geometry (e.g. a segment of a light cone e…

Image of a quantum-corrected black hole without Cauchy horizons illuminated by a static thin accretion disk
Shilong Huang, Jiawei Chen, Jinsong Yang
https://arxiv.org/abs/2510.09956

Image of a quantum-corrected black hole without Cauchy horizons illuminated by a static thin accretion disk
Latest advances in effective quantum gravity propose a quantum-corrected black hole solution that avoids Cauchy horizons. In this paper, we study the image of the black hole and explore the influence of the quantum parameter $ζ$ on its image. First, we investigate the influence of $ζ$ on the event horizon, photon sphere, critical impact parameter, and innermost stable circular orbit associated with the black hole. We find that all these quantities exhibit an increase with increasing $ζ$. Mea…

Constraining the rotating Simpson-Visser spacetime from the observed quasi-periodic oscillations in black holes
Anirban Dasgupta, Indrani Banerjee
https://arxiv.org/abs/2509.15761

Constraining the rotating Simpson-Visser spacetime from the observed quasi-periodic oscillations in black holes
Regular black holes (BHs) which are singularity-free alternatives to the standard black hole paradigm in General Relativity (GR), offer effective models for probing the interface between classical and quantum gravity. They serve as promising candidates for exploring the nature of strong gravity and potential extensions of GR by providing testing grounds to understand how quantum corrections might manifest in astrophysical black holes. In the present work, we investigate the regular BH scenario …

Bianchi-I cosmology with scale dependent $G$ and $\Lambda$ in asymptotically safe gravity
Chiang-Mei Chen, Akihiro Ishibashi, Rituparna Mandal, Nobuyoshi Ohta
https://arxiv.org/abs/2509.09759

Bianchi-I cosmology with scale dependent $G$ and $Λ$ in asymptotically safe gravity
We study anisotropic Bianchi-I (BI) cosmology, incorporating quantum gravitational corrections into the Einstein equation through the scale-dependent Newton coupling and cosmological term, as determined by the flow equation of the effective action for gravity. For the cosmological term $Λ_0=0$, we derive the quantum-corrected power-series solution for a general equation-of-state parameter $w$ in the range $-1

Spinning into Quantum Geometry: Dirac and Wheeler-DeWitt Dynamics from Stochastic Helicity
Partha Nandi, Partha Ghose, Francesco Petruccione
https://arxiv.org/abs/2510.10836 htt…

Spinning into Quantum Geometry: Dirac and Wheeler-DeWitt Dynamics from Stochastic Helicity
Spin networks in loop quantum gravity provide a kinematical picture of quantum geometry but lack a natural mechanism for dynamical Dirac-type evolution, while the Wheeler--DeWitt equation typically enters only as an imposed constraint. We propose a stochastic framework in which each spin-network edge carries helicity-resolved amplitudes -- two-state internal labels that undergo Poisson-driven flips. The resulting coupled master equations, after analytic continuation and the introduction of a fu…

Motion of spinning particles around a quantum-corrected black hole without Cauchy horizons
Jiawei Chen, Jinsong Yang
https://arxiv.org/abs/2509.07682 https://

Motion of spinning particles around a quantum-corrected black hole without Cauchy horizons
In this paper, we investigate the motion of spinning particles around a covariant quantum-corrected black hole without a Cauchy horizon within the framework of effective quantum gravity, and examine the influence of quantum gravitational effects on the motion of these spinning particles. First, we employ the Mathisson-Papapetrou-Dixon equations to derive the 4-momentum and 4-velocity of spinning particles, and introduce the effective potential for radial motion using the components of the 4-mom…