astro-ph.CO
45.6k resultsSpin-1 Ultralight Dark Matter under Cosmological Scrutiny: Mass Constraints from CMB and Distance Probes
Guadalupe Ahumada Acuña, Tomas Ferreira Chase, Diana López Nacir +1
Domain walls through different cosmologies
I. Dankovsky, D. Gorbunov, S. Ramazanov +1
The paper uses lattice simulations to study how domain wall networks evolve under various early‑universe expansion histories, showing that the particle horizon largely determines w…
Inflation, Open Universes, and Dark Energy
Anton Chudaykin, Mikhail M. Ivanov, Renata Kallosh +3
The authors analyze how allowing a small negative spatial curvature and/or a time‑varying dark energy equation of state changes the inferred scalar spectral index nₛ from CMB and g…
A Simulation Based Inference Approach to Modelling of Type Ia Supernova Populations
B. Popovic, M. Grayling, M. O'Callaghan +11
Understanding constraints on primordial mass black holes made of dark matter using fast radio bursts
Surajit Kalita, Shruti Bhatporia, Amanda Weltman
Ab Initio Cosmological Simulations: From Inflation to Present-Day Structure Formation
Drew Jamieson, Angelo Caravano, Eiichiro Komatsu
Single Frequency CMB Foreground Removal with Inter-scale Machine Learning
Helen Shao, Fiona McCarthy, Blake D. Sherwin +2
Local bandpower diagnostics for the hemispherical power asymmetry in CMB E-mode polarization
Robert A Lynch
Multi-branch classification of diffuse cluster radio emission
Markus Bredberg, Emma Tolley
The paper investigates machine‑learning methods, specifically scattering‑transform encoders and squeeze‑excitation attention in multi‑branch neural networks, to improve detection o…
Axion Inflation with a Massive Abelian Gauge Field
Ricardo Z. Ferreira, Alessio Notari, José Jaime Terente DÃaz
The paper studies how an axial coupling between an inflaton (axion) and a massive Abelian gauge field can cause tachyonic amplification of one helicity, analyzes the resulting back…
Dark Matter Constraints from Small-Scale Cosmic Structure
Ethan O. Nadler, Keir K. Rogers, Alex Drlica-Wagner
The paper reviews how observations of small‑scale cosmic structures, such as dwarf galaxies and the Lyman‑α forest, constrain the microphysical properties of dark matter models.
A study of the large-scale formation in the environment of A3266: Infalling groups, filaments, and a premerger cold front
J. Dietl, A. Veronica, T. H. Reiprich +7
The paper uses eROSITA X‑ray data to map the outskirts of the galaxy cluster Abell 3266, revealing a hot X‑ray filament linking the cluster to a nearby group and showing how the cl…
Growth, geometry, and early-universe split of the matter density parameter $Ω_{\rm m}$
Felicitas Keil, Isaac Tutusaus, Alain Blanchard
The paper separates the present‑day matter density parameter Ωₘ into geometric, growth, and early‑universe contributions using DES, Planck, DESI BAO, Pantheon+ supernovae, and RSD…
GGI Lectures on Large-Scale Structure Perturbation Theory (Effective Field Theory)
Mikhail M. Ivanov
These lecture notes introduce non-linear perturbation theory and effective field theory methods for modeling the large-scale distribution of galaxies, targeting undergraduate and e…
Beyond monomial $α$-attractors
Laura Iacconi
The paper investigates inflationary α‑attractor models with a binomial (quadratic + quartic) potential, showing that the quartic term can significantly modify the scalar spectral i…
Cosmo-SPINN: Fuzzy Dark Matter Simulations with Physics-Informed Generative Networks
Ashutosh Kumar Mishra, Emma Tolley, Nicolas Cerardi
The paper introduces a physics‑informed generative U‑Net that can evolve fuzzy dark matter fields and perform super‑resolution of simulations while enforcing the Schrödinger‑Poisso…
No way ou$Ï$: Epoch of Reionization Observations Do not Support Large Values of the Optical Depth to Reionization
Paulo Montero-Camacho, Yi Mao
The authors combine CMB data (excluding large‑scale polarization), BAO measurements, and quasar‑based reionization observations to estimate the optical depth to reionization as τ≈0…
Impact of numerical stability in Bayesian noise wave calibration on global 21-cm experiments
Saswata Dasgupta, Adarsh Kumar Dash, Dominic Anstey +3
The paper identifies and mitigates a numerical instability in the Bayesian noise‑wave calibration used for global 21‑cm experiments, improving reproducibility and accuracy of recei…
J-PAS & FLAMINGO: Cosmic voids and void galaxies in the gravitational landscape of photometric surveys
J. A. Mansour, B. McCarthy, L. J. Liivamägi +34
The paper presents a method that uses a quasi‑gravitational potential field to identify dynamically dominant cosmic voids and their galaxies in photometric surveys like J‑PAS, show…
Shear-kSZ: A New Estimator for the Matter-Electron Power Spectrum from kSZ Tomography and Weak Lensing
Boryana Hadzhiyska
The paper introduces a new estimator that combines kinematic Sunyaev‑Zel'dovich measurements, reconstructed velocity fields, and weak‑lensing maps to directly probe the matter–elec…
Global 21cm Measurement Calibration Methodology
Martin Bucher, Christian J. Kirkham, Eloy de Lera Acedo +2
The paper derives explicit calibration equations for global 21 cm signal experiments, reconciling earlier approaches with amplifier noise formalism and providing a Möbius‑geometry…
Searching for signatures of inflationary massive fields in DESI Imaging data and Stage-V galaxy surveys
Walter Riquelme, Santiago Avila, Lucas Pinol +2
The paper studies how massive fields present during inflation could leave detectable signatures in galaxy clustering, using DESI imaging data and forecasting the capability of futu…
Phantom-divide crossing and suppressed structure growth in kinetically braided dark energy with momentum exchange
Masroor C. Pookkillath, Shinji Tsujikawa
The paper presents a stable scalar‑field model that allows the dark‑energy equation of state to cross from phantom (w < ‑1) to non‑phantom values while reducing the growth of cold…
An efficient one-loop EFTofLSS framework for Vainshtein-screened Horndeski gravity
Stan Verhoeve, Dani de Boe, Gen Ye +1
The authors extend the PyBird code to compute one-loop matter power spectra for Vainshtein‑screened Horndeski and nDGP gravity using a direct ODE approach for time‑dependent kernel…