Tootfinder

Observation of charge–parity symmetry breaking in baryon decays: #universe.

Emergent Turbulence in Nonlinear Gravity
Sizheng Ma, Luis Lehner, Huan Yang, Lawrence E. Kidder, Harald P. Pfeiffer, Mark A. Scheel
https://arxiv.org/abs/2508.13294 https://

Emergent Turbulence in Nonlinear Gravity
Gravity in nonlinear and dynamical regimes underpins spectacular astrophysical phenomena and observable consequences, from the early universe to black hole collisions. In these extreme environments, inverse energy cascades - mediated by nonlinear interactions - may help explain the near scale-invariance of cosmic structure and the simplicity of gravitational waves from binary black hole mergers. Yet the presence, characteristics, and generality of such interactions in full General Relativity re…

Signals of Bursts from the Very Early Universe
Leo Stodolsky, J. Silk
https://arxiv.org/abs/2509.00237 https://arxiv.org/pdf/2509.00237

Signals of Bursts from the Very Early Universe
We consider possible observable signals from explosive events in the very early universe, ``bursts". These could be expected in connection with massive black hole or ``baby universe'' formation. We anticipate that such major disruptions of spacetime would be associated with neutrino and perhaps other pulses. While these seem to be not detectable directly, we discuss how they could lead to potentially observable signals. We analyze how the pulses from very early times may ``escape'', tha…

De Sitter Complexity Grows Linearly in the Static Patch
Vyshnav Mohan, Watse Sybesma
https://arxiv.org/abs/2508.10093 https://arxiv.org/pdf/2508.10093

De Sitter Complexity Grows Linearly in the Static Patch
The observable universe has undergone periods of expansion that are well approximated by de Sitter (dS) space. Still lacking is a quantum mechanical description of dS, both globally and when restricted to the static patch. We develop a novel prescription for computing holographic complexity in the dS static patch to determine its microscopic features. Specifically, we propose that the natural candidate for dS complexity is the volume of extremal timelike surfaces restricted to the static patch,…

Reconstruction of the observable universe from the integrated Sachs-Wolfe effect
Julianne Chung, Yiran Wang
https://arxiv.org/abs/2507.01399 https://

Reconstruction of the observable universe from the integrated Sachs-Wolfe effect
The integrated Sachs-Wolfe (ISW) effect is a property of the Cosmic Microwave Background (CMB), in which photons from the CMB are gravitationally redshifted, causing the anisotropies in the CMB. An intriguing question is whether one can infer the gravitational perturbations from the ISW effect observed near the Earth. In this work, we address the question using a tomographic reconstruction approach, similar to X-ray CT reconstruction in medical imaging. We develop the mathematical analysis for …

Tribrid Inflation, Type II Leptogenesis, and Observable Gravitational Waves in $SU(3)_c \times SU(2)_L \times SU(2)_R \times U(1)_{B-L}$
Waqas Ahmed, Saleh O. Allehabi, Farishta Israr, Mansoor Ur Rehman
https://arxiv.org/abs/2507.05564

Tribrid Inflation, Type II Leptogenesis, and Observable Gravitational Waves in $SU(3)_c \times SU(2)_L \times SU(2)_R \times U(1)_{B-L}$
We present a concrete realization of tribrid inflation within the framework of the gauge group $SU(3)_c \times SU(2)_L \times SU(2)_R \times U(1)_{B-L}$. In this model, inflation is driven by the neutral components of left-handed Higgs triplets, which also play a central role in generating the observed baryon asymmetry of the universe via non-thermal leptogenesis. Tiny neutrino masses arise naturally through a type-II seesaw mechanism, facilitated by right-handed triplet fields. Supergravity co…

Polycyclic Aromatic Hydrocarbons (PAHs) in the High-redshift Universe: Prospect of the PRIMA FIRESS low-resolution spectroscopy
Ilsang Yoon, Brandon Hensley, Thomas S. -Y. Lai, Irene Shivaei, Ismael Garcia-Bernete, Grant P. Donnelly, Alexandra Pope, J. D. T. Smith, Paul Torrey
https://arxiv.org/abs/2509.02470…

Polycyclic Aromatic Hydrocarbons (PAHs) in the High-redshift Universe: Prospect of the PRIMA FIRESS low-resolution spectroscopy
The integrated luminosity from the features of the polycyclic aromatic hydrocarbons (PAHs) exceeds the luminosity from atomic and molecular emission lines in the star-forming regions in galaxies and is a potential tracer of galaxy-scale star formation and molecular gas content of the high-redshift universe. We simulate the observable PAH spectra using the PRobe far-Infrared Mission for Astrophysics far-infrared enhanced survey spectrometer (FIRESS) and investigate the capability of the FIRESS l…

Is $\omega_0 \omega_a$CDM a good model for the clumpy Universe?
Fernanda Oliveira, Felipe Avila, Camila Franco, Armando Bernui
https://arxiv.org/abs/2507.00779

Is $ω_0 ω_a$CDM a good model for the clumpy Universe?
The DESI collaboration just obtained a set of precise BAO measurements, that combined with CMB and SNIa datasets show that the $ω_0 ω_a$CDM model is preferred over $Λ$CDM, at more than $4\,σ$, to describe the dynamics of the expanding Universe. This raises the question whether this model also suitably describes the clumpy Universe. Also lately, detailed analyses of diverse cosmic tracers resulted in a new dataset of measurements of an observable from the clumpy Universe: $σ_8(z)$, spanning…

A Dark Matter Model with Quadratic Equation of State: Background Evolution and Structure Formation
Kazem Rezazadeh, Ebrahim Yusofi, Alireza Talebian
https://arxiv.org/abs/2509.11138

A Dark Matter Model with Quadratic Equation of State: Background Evolution and Structure Formation
We propose that dark matter (DM) possesses a quadratic equation of state, which becomes significant at high densities, altering the Universe's evolution during its early stages. We derive the modified background evolution equations for the Hubble parameter $H(z)$ and the DM density parameter $Ω_{\text{dm}}(z)$. We then perturb the governing equations to study the linear growth of matter fluctuations, computing the observable growth factor $fσ_8(z)$. Finally, we compare the model with the late…

Outflows from Star-Forming Galaxies in the Early Universe: Evolution from Double- to Single-Peaked Lyman-$ \alpha $ Profiles Following Delayed Supernova Feedback
James Nianias, Jeremy Lim, Yik Lok Wong, Gordon Wong
https://arxiv.org/abs/2506.20422

Outflows from Star-Forming Galaxies in the Early Universe: Evolution from Double- to Single-Peaked Lyman-$ α$ Profiles Following Delayed Supernova Feedback
Lyman-$ α$ emission, which owing to its resonant nature strongly couples the emergent line profile to gas kinematics, has become a key observable for probing outflows from star-forming galaxies in the early universe. Typically, Lyman-$ α$ profiles are explained in terms of idealised expanding shell models, while empirically-motivated interpretations of Lyman-$ α$ profiles that make use of comparisons with kinematics revealed by other spectral features (e.g. metal emission and absorption line…

On the gravitational waves from super massive RHNs produced at preheating
Shinya Kanemura, Kunio Kaneta, Dibyendu Nanda
https://arxiv.org/abs/2508.00315 https://

On the gravitational waves from super massive RHNs produced at preheating
The post-inflationary production of supermassive particles can have profound implications for the thermal history of the universe and may leave observable imprints in the gravitational wave (GW) background. In scenarios where the inflaton couples predominantly to heavy fields, say right-handed neutrino (RHN), non-perturbative mechanisms such as parametric resonance can lead to their efficient production, even when their masses exceed the inflaton mass. Once produced, the RHNs emit gravitons thr…

Biased Domain Walls and the Origin of Early Massive Structures
Clara Winckler, Pedro P. Avelino, Lara Sousa
https://arxiv.org/abs/2507.22812 https://arxiv.…

Biased Domain Walls and the Origin of Early Massive Structures
Discrete symmetry-breaking phase transitions in the early universe may have caused the formation of networks of sheet-like topological defects, usually referred to as domain walls, which separate regions that have settled into different vacuum states. Field theory simulations predict the successive collapse of increasingly larger domains, which could potentially leave observable imprints in present-day large-scale structures. We use the parameter-free velocity-dependent one-scale model to provi…