320 papers
This paper demonstrates that within a general class of gravity models, particularly the Starobinsky model, the positive values of the scalar field arising from the conformal transformation provide an additional suppression mechanism for the massless modes of higher-rank antisymmetric tensor fields, thereby explaining their observational absence in the present universe.
This study utilizes combined cosmological datasets (BAO, CC, SNIa, and growth rate data) to constrain viscous fluid models within various gravity frameworks, finding that while exponential and logarithmic models are statistically rejected, the non-viscous power-law model remains a robust alternative to CDM.
This paper demonstrates that strong correlations between the trace and traceless parts of the energy shear tensor in positive-definite matrices allow for a refined parameterization of the initial energy overdensity, thereby explaining scatter in collapse thresholds and enabling accurate predictions of protohalo properties.
This paper presents optical and infrared observations of the peculiar stripped-envelope supernova SN 2022jli, which exhibits a double-peaked light curve with periodic 12.5-day undulations and late-time dust emission, suggesting a scenario where a neutron star formed in a binary system powers the secondary maximum through accretion while potentially linking magnetar activity to broader features in stripped-envelope supernovae.
This paper employs the Lanczos algorithm to investigate Krylov complexity in the early universe as an open system across inflation, radiation, and matter domination epochs, revealing distinct dissipative behaviors, the similarity of complexity evolution across various inflationary potentials, and deriving new evolution equations for squeezing parameters via Meixner polynomials to demonstrate rapid decoherence-like effects.
Using the IllustrisTNG hydrodynamical simulation, this study demonstrates that galaxy assembly bias varies significantly with selection criteria, number density, and redshift, cannot be fully captured by a single secondary halo property, and arises from the interplay between halo assembly bias and occupancy variation, for which the authors propose a fast analytical prediction method.
This paper proposes a novel mechanism called Magnetically Arrested Transmutation (MAT), wherein strong magnetic fields in compact stars halt the accretion of endoparasitic black holes formed by dark matter, thereby explaining the over-representation of magnetic white dwarfs and the unique presence of magnetars near the Galactic center.
This paper investigates ghost-free cubic Poincaré gauge gravity within flat FLRW cosmology, demonstrating that its new dynamical degrees of freedom lead to faster expanding universes with matter content estimates consistent with the standard model across two distinct hypermomentum conservation scenarios.
Using IllustrisTNG simulations, this study demonstrates that thermal emission from warm gas substructures (WCGM) inside clusters and diffuse filaments (WHIM) outside them successfully reproduces the observed soft X-ray excess, suggesting this excess serves as a proxy for the dynamical state of galaxy clusters.
This paper presents new MeerKAT observations of 21 massive, dynamically active galaxy clusters that reveal extended radio emission in all targets, including several new halos and relics, thereby confirming a power-mass correlation for halos and demonstrating the ability to detect low-power relics to better test numerical simulations of cluster evolution.
This paper demonstrates that local over-densities, such as experimental cavities, can significantly suppress the amplitude and gradient of quadratically coupled ultra-light scalar dark matter, thereby hindering detection efforts and relaxing existing constraints on such models, while also proposing a differential force measurement between cavities of different internal structures as a potential detection method.
This paper proposes that "little red dots" are supermassive stars surrounded by massive self-gravitating accretion discs formed during galaxy mergers, a model that successfully reproduces their observed spectral features and suggests they are progenitors to massive black holes consistent with current luminosity and abundance constraints.
By applying a prior-free forward-modeling approach to the Cosmicflows-4 catalog, this study reconstructs the local velocity field to derive a Hubble constant of $75.9\pm1\Lambda$CDM predictions.
Using CLASH-VLT data, this study reveals that while the average velocity anisotropy profile of massive galaxy clusters aligns with cosmological simulations, significant individual variance exists that reflects unique merging histories and cannot be explained by a single universal profile.
The authors introduce the Web-Halo Model (WHM), a parameter-free framework that integrates collapsed structures like filaments and sheets with 1-loop Lagrangian Perturbation Theory to achieve sub-2% accuracy in predicting the non-linear matter power spectrum across various redshifts and cosmologies, outperforming existing models like HMcode-2020 without requiring any free fitting parameters.
This study demonstrates that while an anti-de Sitter vacuum in the dark energy sector can enhance early structure formation, it fails to simultaneously explain the JWST high-redshift galaxy excess and satisfy cosmological constraints from the CMB and low-redshift probes, thereby reinforcing the necessity of evolving astrophysical properties to resolve the tension.
This study analyzes COSMOS-Web galaxy groups from z=0 to z=3.7 using machine learning and multi-method approaches to reveal that quiescent galaxy fractions build up steadily from z=1.5–2 with earlier growth in richer groups, identifies a rare overdensity at z=3.4, and finds that while X-ray faint groups have lower quiescent fractions, the red sequence's slope and scatter remain stable over approximately 12 billion years.
The paper introduces STRAWBERRY, a novel algorithm that identifies dark matter haloes by distinguishing bound and unbound particles through an accelerated reference frame's gravitational potential, revealing that haloes function as two-component systems comprising a stable, virialized core and a rapidly evolving unbound component.
This paper introduces a novel time-series calibration method for global 21-cm cosmology experiments that utilizes noise wave parameters to model and correct for system drift and reference source impedance assumptions, thereby significantly reducing spectral residuals and parameter fit errors compared to previous techniques.
This paper presents and validates a non-explosive pre-supernova (NEPS) feedback module within the COLIBRE galaxy formation model, demonstrating that incorporating momentum injection and photoheating from young massive stars effectively regulates star formation, improves numerical convergence, and synergistically enhances the efficacy of subsequent supernova feedback.