2204 papers
Astro-Ph — Co explores the cosmic origins of matter, diving into how the universe began and evolved from the Big Bang. This field investigates the fundamental forces and particles that shaped galaxies, stars, and the very fabric of space-time, offering a window into the earliest moments of existence.
On Gist.Science, we process every new preprint in this category as it appears on arXiv, ensuring you stay ahead of the curve without needing to decode dense academic jargon. Each paper is transformed into both a plain-language summary for general understanding and a detailed technical breakdown for researchers, bridging the gap between complex data and clear insight.
Below are the latest papers in cosmology and early universe physics, curated directly from the most recent submissions to arXiv.
This paper investigates cosmological collider signatures in a two-field inflationary system with constant-turn derivative mixing by utilizing exact hypergeometric solutions and a Mellin-Barnes approach to derive the full non-perturbative dependence of the squeezed bispectrum's oscillation amplitude and phase on the mixing strength and heavy field mass.
This paper analyzes VST ATLAS galaxy, LRG, and QSO clustering cross-correlated with ACT DR6 CMB lensing to derive bias and HOD parameters, finding that while LRGs align with CDM predictions, QSOs exhibit unexpectedly high bias and mass, and low-redshift galaxies require an anti-bias hypothesis, collectively suggesting that standard halo models may fail to describe intermediate-scale clustering for these populations.
Using 536 Fast Radio Bursts from the CHIME/FRB Catalog and two statistical methods corrected for observational biases, the study finds no significant evidence for cosmic anisotropy, though the results are currently limited by small sample sizes and large uncertainties.
This paper critically reassesses and corrects mathematical inconsistencies in the 2020 study "Non-linear interactions in cosmologies with energy exchange," demonstrating through exact analytical solutions that the original article's flawed derivations invalidate its primary claims.
This paper refines constraints on primordial black hole dark matter in the – mass range by incorporating the effects of black hole spin and five different halo profiles on dust heating via Hawking radiation, revealing that spin significantly strengthens limits while the isothermal profile yields the most stringent constraints.
This paper investigates primordial black hole formation during the preheating phase of -attractor inflation, demonstrating that while the Press-Schechter formalism overestimates abundance and is ruled out by observational constraints, the Khlopov-Polnarev formalism—which accounts for nonspherical collapse effects—yields viable predictions consistent with current data.
Using numerical relativity to evolve Einstein equations, this study demonstrates that while scalar perturbations during the kination epoch follow perturbative predictions in the sub-horizon limit, they exhibit rich non-linear dynamics in the super-horizon regime that may lead to primordial black hole formation and potentially reheat the universe.
This paper presents the largest cosmic shear analysis to date using 270 million galaxies across 13,000 deg² from the DECADE and DES Year 3 datasets, deriving robust constraints on CDM cosmology and dynamical dark energy while demonstrating that current scale-cut methods introduce a residual bias in and that can only be fully mitigated by external baryon model calibrations.
This paper investigates how Flavour Deconstruction extensions of the Standard Model generate detectable primordial gravitational waves through first-order phase transitions, revealing that while LISA detection is possible, the signals typically peak at higher frequencies better suited for mid-band observatories.
This paper utilizes high-resolution self-interacting dark matter (SIDM) simulations to demonstrate that the continuous evolution of halo properties through gravothermal processes, particularly core collapse, can explain the high densities of low-mass perturbers detected in strong gravitational lensing systems, thereby establishing lensing as a powerful probe of dark matter self-interactions.