Tootfinder

Morphology of Young Massive Stellar Clusters with Next-Generation IACTs
Alberto Bonollo, Paolo Esposito, Andrea Giuliani, Patrizia Caraveo, Giorgio Galanti, Silvia Crestan, Michela Rigoselli, Sandro Mereghetti
https://arxiv.org/abs/2509.20150

Morphology of Young Massive Stellar Clusters with Next-Generation IACTs
The term PeVatron designates astrophysical objects capable of accelerating particles to PeV energies. Their nature and particle acceleration mechanisms are uncertain, but ultra-high-energy gamma rays are produced when particles accelerated by either leptonic or hadronic PeVatrons interact with the surrounding medium or radiation fields. The atmospheric air shower observatory LHAASO detected photons with energies above 100 TeV from 43 sources in the Galactic Plane, proving the existence of PeVat…

The emergence of globular clusters and globular-cluster-like dwarfs: #cosmological simulations in which both dark-matter-free GCs and dark-matter-rich dwarf galaxies naturally emerge in the Standard Cosmology. We show that these objects inhabit distinct locations in the size–luminosity plane and that they have similar ages, age spread, metallicity and metallicity spread to globulars and dwarfs in the nearby Universe. About half of our simulated globulars form by means of regular star formation near the centres of their host dwarf, with the rest forming further out, triggered by mergers. The latter are more tidally isolated and more likely to survive to the present day. Finally, our simulations predict the existence of a new class of object that we call ‘globular-cluster-like dwarfs’ (GCDs)."

"Whenever anyone asks me for advice, I tell them: we don’t realize how deeply the nine-to-five fractures us. The weekends, the holidays, the fixed friend group—whatever rigidness exists in your behavior will exist in your perception, and it will exist in your ability to think critically."
Victoria Brugger, "Last Words of an Ego on Death Row"

Last Words of an Ego on Death Row
Hello.I don’t know who you are. But I hope we meet in the next pages—across whichever dimension I had to cross to embody these feelings.This is not a book. It is not a journal.It is the autopsy of an ego and the birth certificate of the woman I am today.It carries the blueprints I bled for: how to build something from nothing, how to love yourself when the mirror is a battlefield, how to decode the nature of existence and drag purpose out of the dark.But more than all of that—this is my b…

An in-depth study of brown dwarfs with TESS
F. Marcadon, A. Pr\v{s}a
https://arxiv.org/abs/2510.05852 https://arxiv.org/pdf/2510.05852

An in-depth study of brown dwarfs with TESS
The existence of a deficit of brown dwarfs (BDs) in close orbit around main-sequence stars is one of the most intriguing questions in stellar physics. This so-called BD desert may result from the transition between two different dominant formation processes occurring for different mass regimes. While the BD mass derived from radial-velocity measurements helps confirm the nature of the analyzed objects, the BD radius obtained from transits is important to better constrain the BD age, as BDs are …

Existence and deformability of topological Morse functions
Ingrid Irmer
https://arxiv.org/abs/2508.03260 https://arxiv.org/pdf/2508.03260

Existence and deformability of topological Morse functions
In the 1950s Morse defined the analogue of Morse functions for topological manifolds. In many instances, when mathematicians are using techniques on topological manifolds that appear to be Morse-theoretic in nature, there is a topological Morse function implicit in the argument. Topological Morse functions are known to inherit most of the familiar properties of the usual (smooth) Morse functions, with two crucial exceptions: existence and deformability. This paper gives a simple construction of…

Fixed points of Personalized PageRank centrality: From irreducible to reducible networks
David Aleja, Julio Flores, Eva Primo, Daniel Rodr\'iguez, Miguel Romance
https://arxiv.org/abs/2507.18652

Fixed points of Personalized PageRank centrality: From irreducible to reducible networks
In this paper we analyze the PageRank of a complex network as a function of its personalization vector. By using this approach, a complete characterization of the existence and uniqueness of fixed points of PageRank of a graph is given in terms of the number and nature of its strongly connected components. The method presented includes the use of a feedback-PageRank in order to compute exactly the fixed points following the classic Power's Method in terms of the (left-hand) Perron vector of eac…

Entanglement dynamics of monitored non-interacting fermions on Graphic-Processing-Units
Bo Fan, Can Yin, Antonio M. Garc\'ia-Garc\'ia
https://arxiv.org/abs/2508.18468 ht…

Entanglement dynamics of monitored non-interacting fermions on Graphic-Processing-Units
The description of the entanglement dynamics of monitored non-interacting fermions, including the existence of measurement-induced phase transitions (MIPT), is a challenging problem with conflicting results in the literature. The mapping of the problem onto a non-linear sigma model (NLSM) indicates that relatively large lattice sizes are required to determine the nature of the entanglement entropy (EE) in the thermodynamics limit. Here we address this problem numerically for monitored non-inter…

Topological charge and black hole photon spheres in massive gravity
Pavan Kumar Yerra, Chandrasekhar Bhamidipati
https://arxiv.org/abs/2509.04261 https://a…

Topological charge and black hole photon spheres in massive gravity
In this paper, we investigate the existence and nature of the photon spheres (PS) in the background of four dimensional static and spherically symmetric black holes in the de Rham-Gabadadze-Tolley (dRGT) massive gravity theory. Apart from the known case of one PS, there are regions in the parameter space of massive gravity where either two or no PS's exist outside the event horizon. Topological arguments show that, the case of one PS falls in the category of Einstein gravity (with topological c…

A Preliminary Study: Pathwise Patching and the Geometric Nature of Quasi-Sure Existence in GSDEs
Guangqian Zhao
https://arxiv.org/abs/2510.06054 https://ar…

A Preliminary Study: Pathwise Patching and the Geometric Nature of Quasi-Sure Existence in GSDEs
This paper introduces a preliminary working perspective on constructing solutions to G-stochastic differential equations (GSDEs). We propose a pathwise patching methodology that offers a geometric interpretation for the concept of quasi-sure solutions. Unlike conventional methods based on fixed-point theorems in function spaces (which secure uniqueness in the quasi-sure sense), our approach focuses on defining the solution $X_t$ directly on the path space by synthesizing individual solutions $X…

Primordial black holes versus their impersonators at gravitational wave observatories
Andrea Begnoni, Stefano Profumo
https://arxiv.org/abs/2509.04028 https://

Primordial black holes versus their impersonators at gravitational wave observatories
The detection of primordial black holes (PBHs) would mark a major breakthrough, with far-reaching implications for early universe cosmology, fundamental physics, and the nature of dark matter. Gravitational wave observations have recently emerged as a powerful tool to test the existence and properties of PBHs, as these objects leave distinctive imprints on the gravitational waveform. Notably, there are no known astrophysical processes that can form sub-solar mass black holes, making their disco…

High-energy variability of the gravitationally lensed blazar PKS 1830-211
Sarah M. Wagner, Jeffrey D. Scargle, Greg Madejski, Andrea Gokus, Krzysztof Nalewajko, Patrick G\"unther, Karl Mannheim
https://arxiv.org/abs/2510.07220

High-energy variability of the gravitationally lensed blazar PKS 1830-211
The production site and process responsible for the highly variable high-energy emission observed from blazar jets are still debated. Gravitational lenses can be used as microscopes to investigate the nature of such sources. We study the broad-band spectral properties and the high-energy variability of the gravitationally-lensed blazar PKS 1830-211, for which radio observations have revealed two images, to put constraints on the jet physics and the existence of a gravitationally-induced time de…

Quantum Droplets of Light in Semiconductor Microcavities
Matteo Caldara, Olivier Bleu, Francesca Maria Marchetti, Jesper Levinsen, Meera M. Parish
https://arxiv.org/abs/2507.19324

Quantum Droplets of Light in Semiconductor Microcavities
Quantum droplets are dilute self-bound configurations of bosons that result from the balance between a mean-field attraction and a repulsion induced by quantum fluctuations. Such droplets have been successfully realized in cold atomic gases and represent a signature of their quantum nature. Here, we predict the existence of a similar droplet phase in a solid-state system, involving polaritons formed from the strong coupling between excitons (bound electron-hole pairs) and photons in a semicondu…

Rotational-Mode-Enhanced Piezoelectricity in a Ferroelectric Double Helix
Yihao Hu, Shi Liu
https://arxiv.org/abs/2508.05017 https://arxiv.org/pdf/2508.050…

Rotational-Mode-Enhanced Piezoelectricity in a Ferroelectric Double Helix
Recent theoretical work has predicted the existence of a ``dipole spiral" structure in strained freestanding membranes, promising a route to giant electromechanical responses[\href{https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.133.046802}{PRL \textbf{133}, 046802 (2024)}]. However, its microscopic nature, energetic landscape, and electronic consequences remain largely unexplored. Here, using first-principles calculations on PbTiO$_3$ under biaxial tensile strain, we unveil a novel f…

From Capture to Collapse: Revisiting Black Hole formation by Fermionic Asymmetric Dark Matter in Neutron Stars
Sandra Robles, Drona Vatsyayan, Giorgio Busoni
https://arxiv.org/abs/2507.22881

From Capture to Collapse: Revisiting Black Hole formation by Fermionic Asymmetric Dark Matter in Neutron Stars
Fermionic asymmetric dark matter (ADM) can be captured in neutron stars (NSs) via scatterings with the star constituents. The absence of dark matter annihilation due to its asymmetric nature leads to ADM accumulation in the NS core, potentially reaching densities sufficient to exceed the Chandrasekhar limit and trigger its gravitational collapse into a black hole (BH), eventually consuming the NS from within. Therefore, the existence and observation of old neutron stars provides a means to cons…

An Introduction to Silent Paralinguistics
Zhao Ren, Simon Pistrosch, Buket Co\c{s}kun, Kevin Scheck, Anton Batliner, Bj\"orn W. Schuller, Tanja Schultz
https://arxiv.org/abs/2508.18127

An Introduction to Silent Paralinguistics
The ability to speak is an inherent part of human nature and fundamental to our existence as a social species. Unfortunately, this ability can be restricted in certain situations, such as for individuals who have lost their voice or in environments where speaking aloud is unsuitable. Additionally, some people may prefer not to speak audibly due to privacy concerns. For such cases, silent speech interfaces have been proposed, which focus on processing biosignals corresponding to silently produce…

Galactic Super-Accreting X-ray Binaries as Super-PeVatron Accelerators
Jieshuang Wang, Brian Reville, Felix Aharonian
https://arxiv.org/abs/2507.21048 https://

Galactic Super-Accreting X-ray Binaries as Super-PeVatron Accelerators
The extension of the cosmic-ray (CR) spectrum well beyond 1~PeV necessitates the existence of a population of accelerators in the Milky Way, which we refer to as Super PeVatrons. Identifying the nature of these sources remains a challenge to the paradigm of galactic CRs. Galactic super-accreting X-ray binaries, where the compact object accretes at a rate near or above the Eddington limit, can meet the energy requirement to supply the high-energy population of galactic CRs. We demonstrate that t…