320 papers
Using a stacked sample of 3,496 galaxy clusters from ACT-DR4 and DR6 data, this study demonstrates that while four different pressure profile models (gNFW, -model, polytropic, and exponential) fit the observed Sunyaev-Zel'dovich signals equally well, residual trends and scatter prevent the assumption of a truly universal pressure profile, particularly for high-precision applications.
Using high-resolution ESPRESSO spectroscopy, researchers detected the highest-redshift H2 absorption to date at z=4.24, revealing the existence of widespread, tiny cold overdensities in the neutral medium that are typically undetectable in standard surveys.
Using high-resolution XRISM/Resolve spectroscopy, this study reveals that while the hot X-ray gas in M87's AGN-associated arms shows limited dynamical impact, the cooler uplifted gas exhibits significant velocity gradients and dispersions, supporting the uplift scenario and suggesting that AGN-driven motions in the hot ICM are short-lived.
This study utilizes ISW-tSZ cross-correlation data to constrain and compare thawing, tracker, and scaling-freezing quintessence models against the standard CDM cosmology, finding that while the thawing model provides the best fit, current observations remain consistent with CDM and highlight the need for future high-precision measurements to distinguish between these dark energy scenarios.
This paper generalizes the Ellis & Baldwin formula to arbitrary luminosity and spectral distributions, demonstrating that the anomalous cosmic dipole persists beyond power-law assumptions when applied to CatWISE quasar data, thereby providing a more robust framework for interpreting future dipole measurements.
This paper presents a new, computationally efficient subgrid framework implemented in the {\sc arepo} code that successfully models Population III feedback and metal enrichment in early universe simulations, demonstrating convergence in star formation rates and metal distribution at high redshifts.
This paper demonstrates that in Rastall gravity, the non-minimal coupling between matter and geometry significantly alters the collapse threshold and exponential abundance of primordial black holes, establishing them as sensitive probes for testing modified gravity theories within current cosmological constraints.
This paper investigates the redshift dependence of the Hubble constant using binned Type Ia supernova data within the flat CDM framework, comparing logarithmic and power-law parameterizations that agree at low redshifts but diverge significantly when extrapolated to early cosmic epochs like BBN and inflation, with the logarithmic form predicting a finite redshift where the Hubble parameter vanishes while the power-law form approaches zero asymptotically.
The paper introduces -EFTCAMB, a publicly available, Cobaya-integrated Python extension of EFTCAMB that enables robust cosmological testing of arbitrary covariant Horndeski gravity theories through both EFT mapping and direct scalar field equation solving, the latter of which remains valid even in regimes where the EFT approach fails.
This paper investigates how primordial non-Gaussianity can convert small-scale Poisson fluctuations of evaporating primordial black holes into large-scale isocurvature perturbations in the dark sector, thereby establishing new constraints on dark matter production scenarios alongside re-evaluations of limits from overproduction, warm dark matter, and scalar-induced gravitational waves.
This paper analyzes radiative corrections in no-scale supergravity inflation models, demonstrating that while such corrections can destabilize predictions in certain Wess-Zumino scenarios, specific classes like the Cecotti model maintain small loop effects that preserve agreement with Planck CMB data.
This paper employs a gradient-expansion formalism to identify a previously overlooked region of stable backreaction in axion inflation and characterizes the nonlinear dynamics of the unstable regime, revealing a supercritical Hopf bifurcation and burst-like oscillations that lead to a refined criterion for the onset of instability.
This paper investigates the Sommerfeld enhancement in dark matter annihilation into unstable, non-relativistic final-state particles by incorporating their decay widths into the Schrödinger equation, revealing that narrow-width bound states induce resonant enhancements that significantly impact dark matter relic abundance predictions.
This paper investigates how the Weinberg angle, a fundamental parameter in the Standard Model that may vary with environmental conditions, influences the Fermi coupling constant and consequently determines the initial neutron abundance in Big-Bang nucleosynthesis and the neutron lifetime.
This paper employs the Parametrized Post-Einsteinian formalism and Fisher forecasts to demonstrate that the Laser Interferometer Space Antenna (LISA) can precisely constrain deviations from General Relativity in tensor, vector, and scalar gravitational wave polarizations emitted by massive black hole binaries, achieving high-precision tests of modified gravity theories in the strong-field regime.
This study proposes using Event Horizon Telescope polarimetric observations of M87's relativistic jet to detect axion-like particles by identifying degree-level electric vector position angle rotations caused by axion-photon coupling, which can be distinguished from plasma Faraday rotation through specific morphological diagnostics.
While decaying dark matter can mimic the background effects of massive neutrinos and allow for eV-scale masses when only distance-based data are used, the inclusion of CMB perturbation observables, particularly lensing, decisively breaks this degeneracy and restores tight neutrino mass constraints.
This paper investigates the properties and observational signatures of electrically charged exotic compact objects in Einstein-scalar-Maxwell theories, demonstrating their shell-like structure and establishing constraints on model parameters by analyzing photon rings, gravitational lensing, and innermost stable circular orbits.
This paper proposes a unified cosmological origin where a broad enhancement of the primordial curvature power spectrum simultaneously explains the existence of planet-mass primordial black holes as dark matter and the nanohertz stochastic gravitational-wave background detected by pulsar timing arrays.
This paper proposes a class of models based on a gauged flavor symmetry that simultaneously explains the fermion mass hierarchy via the Froggatt-Nielsen mechanism and solves the strong CP problem with a high-quality axion, while also providing a unified framework for dark matter, leptogenesis, and testable flavor-changing predictions.