320 papers
This paper presents the first observational constraints on Luciano-Saridakis entropic cosmology using combined background data, demonstrating that the model provides a statistically robust fit to current observations and offers a viable extension to the standard CDM model with the potential to alleviate the Hubble tension.
This paper demonstrates that the marked power spectrum is a practical and efficient alternative to the bispectrum for extracting non-Gaussian information from galaxy redshift surveys, as it effectively breaks parameter degeneracies, accommodates standard survey geometry treatments, and allows for cosmological inference through smooth interpolation rather than complex analytical modeling.
This paper proposes that the Weibel instability, driven by photoionization-induced anisotropic electron velocity distributions during cosmological reionization, can rapidly generate seed magnetic fields in the intergalactic medium.
This paper demonstrates that late-time de Sitter cosmological correlators can be efficiently computed and analyzed using a non-unitary Euclidean AdS Lagrangian, revealing that the theory's unitarity is encoded in the positivity of the spectral density rather than standard CFT constraints, with resonant features in this density offering potential signatures for experimental detection.
This study utilizes complete spectroscopic samples from nine massive local galaxy clusters to characterize their stellar mass functions, revealing distinct shapes for quiescent and star-forming populations and identifying a significant excess of intermediate-mass galaxies compared to IllustrisTNG-300 simulations, thereby providing critical constraints for galaxy formation models in dense environments.
This paper proposes and observationally constrains a novel "structure-induced" dark energy model, which links cosmic structure formation to dark energy evolution, demonstrating its viability as a solution to fine-tuning and coincidence problems while offering flexibility in addressing current cosmic tensions.
This paper proposes that inflationary gravitational particle production generates significant late-time dark matter fluctuations, thereby expanding the viable parameter space for four distinct dark matter scenarios (Inert, WIMPy, UFOy, and FIMPy) while remaining consistent with current cosmological constraints.
This paper investigates non-minimally coupled scalar field inflation within Loop Quantum Cosmology with inverse-volume corrections, demonstrating that the model's predictions for inflationary observables align with current observational data while the non-minimal coupling significantly enhances the probability of achieving sufficient inflation by enlarging the favorable phase-space volume.
This paper defends the excursion-set formalism for deriving primordial black hole mass distributions by demonstrating that noise is strictly white when sampling on a synchronous surface and that cloud-in-cloud effects remain crucial for broad power spectra, thereby establishing the necessity of solving the first-passage-time problem with a moving barrier.
This paper demonstrates that wave-optics effects induced by cold dark matter subhalos in the mass range of $10^410^7\,M_{\odot}$ produce detectable, percent-level frequency-dependent amplitude and phase distortions in strongly lensed gravitational waves within the LISA band, offering a novel probe of subgalactic dark matter structure inaccessible to electromagnetic observations.
This paper introduces a novel tomographic method to simultaneously reconstruct the bias-weighted mean electron pressure and star formation rate density by jointly modeling the thermal Sunyaev-Zeldovich effect and Cosmic Infrared Background in cross-correlations with galaxy samples, yielding redshift-dependent measurements up to that are largely consistent with FLAMINGO hydrodynamical simulations.
This paper proposes a hierarchical framework and a Fisher-like sensitivity analysis to demonstrate that modeling the redshift evolution of lens mass profiles is essential for avoiding significant biases and achieving precise cosmological constraints from upcoming LSST strong-lensing surveys.
This paper presents an alternative Baryon Acoustic Oscillation (BAO) measurement from the Dark Energy Spectroscopic Instrument's second data release using Legendre multipole representations of Lyman-alpha forest correlations, which achieves 0.96% precision on the isotropic BAO scale at with results consistent with the baseline analysis while offering a positive-definite covariance matrix and reduced nuisance parameter constraints.
This paper proposes that Hermiticity in quantum mechanics is a symmetry arising from global inner product conservation, which becomes obstructed by causal horizons in black hole geometries, thereby inducing effective non-Hermitian dynamics that unify gravity, entropy production, and the generalized second law of thermodynamics.
This paper utilizes hydrodynamical simulations to demonstrate that galaxy-halo connection parameters, 2D projection effects, and velocity field treatments significantly bias the interpretation of Sunyaev-Zel'dovich signals around galaxies, thereby necessitating careful modeling to accurately constrain gas thermodynamics and feedback processes.
Using high-resolution Lyman- forest data and new Sherwood-Relics simulations, this study presents updated constraints on the isocurvature fraction of post-inflationary axion-like particles, revealing a tentative detection of a non-zero contribution while establishing competitive upper bounds that surpass previous large-scale structure limits.
This paper demonstrates that a lunar laser interferometer can directly probe the kinetic sector of the effective field theory of dark energy by measuring horizon-scale metric fluctuations, thereby enabling constraints on the dark energy sound speed and kinetic operators that are inaccessible to traditional background expansion probes.
Employing the STOchastic LAttice Simulation (STOLAS) code, this study investigates the spatial profiles and topological structures of curvature perturbations in multi-waterfall hybrid inflation models, validating the stochastic-N algorithm while revealing how stochastic noise drives defect reconnection and imposes upper bounds on perturbations in cubic potential scenarios.
This paper presents a combined analytical and numerical study of field theory cosmic strings, demonstrating that while translational Goldstone modes lack nontrivial curvature corrections, massive shape modes couple to worldsheet curvature to induce parametric instabilities that transfer energy between sectors.
This paper demonstrates that a first-order cosmological phase transition occurring between 1 GeV and $10^6\gamma$-ray telescope constraints, with the specific outcomes depending on the fraction of kinetic energy converted into magnetohydrodynamic turbulence.