280 papers
This paper models particle acceleration in ultra-fast outflows from active galactic nuclei and demonstrates that next-generation very-high-energy observatories, such as the Cherenkov Telescope Array, could detect their gamma-ray signatures even if they remain invisible to current instruments like Fermi-LAT.
This paper proposes a symmetry-protected interacting dark energy model where a pseudo-Nambu-Goldstone Boson couples to inert scalar dark matter solely through momentum exchange, demonstrating that while this mechanism modifies cosmological perturbations, it has an intrinsic limit on suppressing structure growth () that prevents it from fully resolving current low-redshift tensions.
This paper investigates the Little Rip dark energy model as a potential solution to the and cosmological tensions using recent observational data, including DESI-DR2, and finds that while the model reduces the Hubble tension to below $3\sigma\Lambda$CDM model.
This review explores how space-based gravitational wave detectors like LISA can probe the nature of dark matter by analyzing its effects on compact-object dynamics, gravitational lensing, and direct field couplings.
This paper evaluates the completeness of the QUBRICS survey by analyzing 3,501 QSO redshifts from Gaia DR3 spectra, confirming the high efficiency of its selection methods (89% recall) and providing a spectroscopic completeness estimate of 82% alongside reliable redshifts for 1,223 new quasars to support future cosmological studies.
By analyzing CosmicFlows4 data within a 350 Mpc volume, this study identifies distinct scaling regimes and strong intermittency in the local universe's velocity and density fields, revealing non-Gaussian, cascade-like characteristics and a transition toward large-scale homogeneity.
Using CMB polarization data from the BICEP/Keck BK18 dataset, this study presents the first constraints on multipole-dependent cosmic birefringence within an Early Dark Energy scenario, finding no evidence for a step-function rotation and deriving an axion-photon coupling amplitude of consistent with previous limits.
This study demonstrates that while extended dark energy models remain consistent with CDM at the background level, their distinct expansion histories and matter densities induce significant, coherent non-linear signatures in structure formation—such as enhanced small-scale power and altered halo formation epochs—that can be effectively constrained by large-scale structure observables.
This paper introduces the CEREAL sample, a Planck-selected ensemble of 169 low-redshift galaxy clusters with uniform Chandra X-ray follow-up, which reveals a significantly higher fraction of non-cool core systems compared to traditional X-ray-selected samples and establishes a well-understood baseline for evolutionary studies of distant clusters.
Using the deep-learning algorithm DINGO-lensing to overcome computational limitations, this study reanalyzes the gravitational wave candidate GW231123 with over 200,000 simulations and concludes that it is not a lensed event due to its statistical significance falling below 4, while highlighting the critical impact of waveform systematics and the potential for future discoveries with improved detection statistics.
This paper proposes a predictive Grand Unified Theory in Palatini gravity where a Higgs field drives inflation and breaks symmetry, linking CMB observables and proton decay lifetimes to offer a testable framework that resolves monopole abundance issues and accommodates current cosmological data.
This paper proposes a non-canonical pseudo-scalar extension of the Chern-Simons inflation mechanism that, by reducing the field's sound speed, effectively suppresses sourced scalar perturbations to allow for a dominant, nearly totally polarized chiral gravitational wave background without violating non-Gaussianity constraints.
This paper investigates the scattering of non-relativistic finite-size particles using the partial wave method to demonstrate how particle size significantly alters interaction potentials and cross sections, revealing non-perturbative effects in puffy dark matter direct detection that depend on the size-to-range ratio and offering stability-based constraints for nugget-type dark matter.
The paper demonstrates that the final state of a binary black hole merger corresponds with remarkable accuracy to the configuration that maximizes the instability rate of null geodesics, suggesting a deep connection between merger dynamics and the efficiency of photon ring scrambling.
This paper proposes a novel H and HD formation pathway driven by Jahn-Teller dynamical coupling in H that bypasses standard CMB-suppressed intermediates, potentially explaining the unexpectedly early and abundant formation of luminous galaxies and supermassive black holes observed by the James Webb Space Telescope.
This paper demonstrates that cross-correlating photometric galaxies with Lyman- forest data using a novel theoretical framework can reliably calibrate the redshift distribution of high-redshift () galaxy samples, achieving a mean redshift precision of at in simulations of future DESI and LSST surveys.
This paper introduces BLISS, a simulation-based inference framework that utilizes convolutional neural networks and denoising autoencoders to probabilistically detect, deblend, and measure galaxy properties in crowded astronomical images, demonstrating significant improvements in flux accuracy for blended and faint objects compared to deterministic methods.
This paper introduces a novel statistical method using astrometric asymmetries in lensed arcs to constrain the dark matter subhalo mass fraction in galaxy clusters, demonstrating its reliability through simulations and preliminary applications to JWST observations of MACSJ0416 and AS1063 that yield results consistent with Cold Dark Matter predictions.
This paper demonstrates that Variational Autoencoders can effectively compress and analyze approximately 200,000 DESI galaxy spectra to identify both instrumental artifacts and unique astrophysical objects, while also revealing interpretable latent structures that separate object classes and track physical characteristics like star formation and emission lines.
This paper employs Fisher analysis to demonstrate that global 21-cm signal experiments, including current facilities like EDGES and SARAS3, can significantly improve constraints on dark matter-baryon scattering in Coulomb-like and velocity-independent models, while highlighting critical degeneracies between interaction cross sections and specific astrophysical parameters that must be carefully characterized to accurately probe dark matter physics.