318 papers
This white paper, produced by the EU-funded Cosmic WISPers network, reviews the theoretical motivations and ongoing searches for Weakly Interacting Slim Particles (WISPs) as dark matter candidates, while outlining a strategic roadmap to secure European leadership in this field through diverse and cost-effective experiments over the next decade.
Using IXPE observations of the 2025-2026 outburst, this study reports the discovery of significant, strong energy-dependent X-ray polarization in the black hole binary GS 1354-64 during an intermediate state, revealing a ~4% polarization degree that increases to ~11% at higher energies and providing new insights into the accretion geometry and coronal structure of black hole X-ray binaries.
This paper reports the detection of a high-energy neutrino flare from the Type IIn supernova SN~2017hcd with an isotropic energy far exceeding that of its ejecta, suggesting the emission likely originated from a choked jet rather than the standard ejecta–circumstellar medium interaction.
This paper investigates the quasinormal modes of a scalar field on a parity-violating rotating black hole background, deriving perturbative frequency corrections for low spins and revealing significant deviations from Kerr predictions in the near-extremal regime, thereby offering a new method to probe parity-violating gravity in strong gravitational fields.
This paper analyzes the evolution of time-lags and type-C QPOs in the black hole X-ray binary Swift J1727.8-1613 during its 2023 rising outburst, revealing a transition from hard to soft lags and strong correlations with QPO frequency and shock location that support the propagating oscillatory shock model of accretion dynamics.
High-cadence TESS observations of the high-redshift quasar PKS 0805−07 reveal a statistically significant, transient optical quasi-periodic oscillation with a period of approximately 1.7 days, which is interpreted as likely arising from either a hotspot orbiting a supermassive black hole or magnetohydrodynamic instabilities within the relativistic jet.
Based on multifrequency radio and X-ray observations indicating a strong magnetic field and low plasma beta, this paper proposes that the accretion flow onto Sgr A* transitions from a convection-dominated regime at large scales to a supersonic wind above a small accretion disk near the event horizon.
This study presents the first spatially resolved metallicity analysis of the nearby Seyfert 2 galaxy Mrk 573 at pc scales, revealing patchy oxygen enrichment in AGN-dominated regions that correlates with radio jet emission and suggests metals are transported from the nucleus by AGN-driven outflows rather than star formation.
This study analyzes six years of cosmic muon rate data from a high-latitude station in Svalbard, revealing that seasonal atmospheric temperature variations drive a pronounced annual modulation and demonstrating the effectiveness of tailored temperature correction techniques compared to lower-latitude measurements.
This paper demonstrates that wave-optics effects induced by cold dark matter subhalos in the mass range of $10^410^7\,M_{\odot}$ produce detectable, percent-level frequency-dependent amplitude and phase distortions in strongly lensed gravitational waves within the LISA band, offering a novel probe of subgalactic dark matter structure inaccessible to electromagnetic observations.
This paper presents an automated framework utilizing the ALeRCE broker to systematically search for optical counterparts to LIGO-Virgo-KAGRA gravitational wave superevents during the O4a and O4b runs, successfully identifying several plausible candidates including a transient consistent with a Bowen fluorescence flare in an AGN.
This paper presents a likelihood-based comparison of locally constructed empirical and theoretically-motivated gamma-ray background models, finding that empirical descriptions provide statistically competitive fits to data on degree scales in high-latitude regions relevant for indirect dark matter searches.
This paper proposes a novel methodology to estimate the extragalactic photon flux generated by axions produced and subsequently decaying from Primordial Black Holes, suggesting that future detectors like e-ASTROGAM are well-positioned to observe this signal.
This paper presents a data-driven multilateration method that utilizes the arrival times of the first inverse beta decay neutrino events across multiple detectors, combined with a reference lightcurve from a larger detector, to rapidly estimate the direction and generate probability skymaps for Galactic core-collapse supernovae without relying on simulations.
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 proposes that the quasi-steady radio emission from repeating fast radio bursts originates from a magnetar wind nebula interacting with supernova ejecta, successfully modeling the observed fluxes for different sources using rotation-powered or magnetar-flare-powered neutron star scenarios with specific ages, magnetic fields, and progenitor types.
This paper introduces a novel "thermodynamic forcing" method implemented in particle-in-cell simulations to systematically model transport in weakly collisional plasmas, revealing that heat-flux saturation under multiple macroscopic gradients is mediated by the bulk-velocity-gradient-driven electron firehose instability rather than the temperature-gradient-driven whistler instability.
This paper presents a statistically significant sample of 1,220 quasar pairs and candidates compiled from DESI DR1, which includes 1,020 confirmed pairs and a notable wide-separation quadruply lensed quasar candidate, providing a crucial dataset for studying galaxy mergers and black hole growth.
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 uses particle-in-cell simulations to demonstrate that asymmetric erosion of intense radio pulses in longitudinally magnetized plasma can generate circular polarization from linearly polarized inputs, offering a potential mechanism to explain the circularly polarized fast radio bursts observed from magnetars.