319 papers
Using the TARDIS radiative-transfer code combined with neural network emulation and MCMC inference, this study demonstrates that single high-velocity density enhancements cannot simultaneously reproduce the observed silicon and calcium high-velocity features in Type Ia supernovae, suggesting that current delayed- and double-detonation explosion models are incomplete.
This paper proposes that magnetic fields spreading diffusively from stellar and galactic dynamos into their turbulent, poorly conducting exteriors form confined magnetospheres with distinct decay properties and expansion dynamics that differ from standard potential or force-free models, thereby ruling out such fields as the source of intergalactic void magnetization.
Using 22 years of INTEGRAL/SPI data to analyze 18 nearby pre-supernova stars, this study finds no evidence of axion-like particle-induced emission and establishes some of the strongest constraints to date on ALP-photon and ALP-electron couplings for masses up to $10^{-11}$ eV.
This paper presents a 15-year multiwavelength study of the blazar OP 313, revealing that its recent intense gamma-ray activity is triggered by new jet components emerging from the core and interacting with a standing shock, with emission likely arising from inverse Compton scattering of dusty torus photons.
This study uses hydrodynamic simulations to demonstrate that, unlike main-sequence stars, giant stars undergoing deep partial tidal disruption events are captured by supermassive black holes due to energy loss driven by asymmetric mass loss from their compact cores, a process that enables repeating partial tidal disruption events and influences extreme mass ratio inspiral evolution.
Although a deep IXPE observation of magnetar 1E 1547.0-5408 revealed high X-ray polarization and spectral features suggestive of vacuum resonance, the successful modeling of polarization modulation via a rotating vector model indicates that these high polarization levels arise from geometric effects rather than providing definitive proof of vacuum birefringence, though the results continue to support the presence of QED effects in magnetars.
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.
Through 56 3D hydrodynamic simulations of ONe white dwarfs, this study identifies a critical transition density range and demonstrates that both ignition conditions and laminar flame speeds are decisive factors in determining whether electron-capture supernovae result in a thermonuclear explosion or a gravitational collapse.
This study presents an 18-year timing analysis of the relativistic binary PSR J1906+0746 using data from six radio telescopes, yielding precise measurements of its orbital parameters and component masses consistent with a double neutron star system under general relativity, while also characterizing a large glitch and reporting a potential secular change in the projected semi-major axis that could indicate a massive, fast-rotating white dwarf companion.
This paper reports the first sub-solar mass compact binary search using LIGO's O4a data, which found no significant candidates but established the tightest constraints to date on merger rates and local dark matter fractions, significantly improving upon previous limits from earlier observing runs and microlensing surveys.
This paper proposes a framework for testing quantum gravity by analyzing the stochastic gravitational-wave background from evaporating near-Planck-mass primordial black holes, demonstrating that their unthermalized graviton spectra preserve distinct signatures of modified temperature-mass relations that can be used to discriminate between various beyond-semiclassical theories.
This paper proposes a new disc-corona model featuring a transition radius that shrinks as the mass accretion rate declines, successfully explaining the observed long-term X-ray spectral hardening in tidal disruption events like AT 2019azh.
This study demonstrates that the charge-weak form factor difference in Ca and Zr is highly sensitive to the isovector spin-orbit interaction due to specific shell structures, whereas Pb and Ni remain insensitive, thereby guiding a strategic approach to use parity-violating electron scattering on these distinct nuclei to separately constrain the isovector spin-orbit strength and the symmetry energy slope.
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.
This paper demonstrates that force-free electrodynamics in Minkowski spacetime possesses conformal symmetry under Möbius transformations, which links known solutions by mapping the interior of a magnetospheric horizon to the exterior of its dual counterpart.
This paper demonstrates that while the lowest-order Blandford-Znajek jet power is universal across generic stationary and axisymmetric black-hole spacetimes, the next-leading-order corrections depend on the specific spacetime geometry, offering a potential method to distinguish rapidly rotating black holes through combined measurements of jet luminosity and angular velocity.
This paper introduces "Deep Horizon," a machine learning framework utilizing two convolutional neural networks to accurately recover black hole physical parameters from simulated Event Horizon Telescope images, demonstrating that while current ground-based resolution limits recovery to mass and accretion rate, higher-resolution space-based observations at 690 GHz would enable the precise estimation of additional parameters including spin and viewing angle.
The Event Horizon Telescope collaboration successfully imaged the supermassive black hole at the center of galaxy M87, revealing a bright asymmetric ring surrounding a dark shadow consistent with general relativity predictions and enabling a precise mass measurement of approximately 6.5 billion solar masses.
This paper reports the first direct detection of gravitational waves on September 14, 2015, originating from the merger of a binary stellar-mass black hole system, a discovery that confirms the existence of such binaries and validates key predictions of general relativity.