High Energy Astrophysical Phenomena Papers of the Week

We present the results for gravitational-wave lensing searches on the data from the first part of the fourth LIGO–Virgo–KAGRA observing run (O4a).

Abstract We analyze the mass-ratio and effective-spin ( χ eff ) distributions of binary black hole mergers in the latest gravitational-wave catalog, GWTC-5, as a function of primary mass.

We predict correlations should exist between Balmer break strength, Balmer line absorption, and scattering line width, and confirm their presence in the observed sample.

Non-rotating calculations or approximate rotational corrections can bias equation of state inference and limit the fidelity of population synthesis in tracing the evolutionary history of progenitors and propagating equation of state uncertainties. In this \textit{Letter}, we develop physics-informed neural operators that can solve the axisymmetric problem with high accuracy and negligible computational cost.

We report the discovery of the Seyfert galaxy J234728.73+242745.7 as a recurrent intermediate-type CLAGN with extreme optical/UV variability.

We find preSNe bounds on dark photon couplings up to two orders of magnitude stronger than SNe for masses between 1 and 3~MeV, with similar improvements for other electrophilic species such as axion-like particles.

We present a systematic study of the spin evolution of accreting black holes.

Because runs differing by as little as $\sim 10^{-10}$ in the metric decorrelate completely once the shock-cone instability saturates, we compare models statistically using ensembles of independent realizations.

We investigate the cosmological implications of supermassive primordial black holes (PBHs) as a component of dark matter (DM), focusing on their seed effect on large-scale structure formation.

For the first time, we adopt a novel numerical method that combines magnetohydrodynamics with energetic particles incorporating feedback from nonthermal electrons to investigate electron acceleration and transport in solar flares.

For the heliosheath conditions considered here, we find that reconnection-driven acceleration is inefficient downstream of the termination shock, whereas reconnection near the heliopause can generate stronger compression and produce a power-law differential intensity spectrum $J(\varepsilon)\propto\varepsilon^{-5.4}$.

Using simulations of expected kilonovae at LVK O5 sensitivity, we find that Argus and Rubin could detect binary neutron star kilonovae at a rate of 0.3-4.2 yr$^{-1}$ and 0.6-7.0 yr$^{-1}$ respectively.

Post-common-envelope evolution (CEE) circumbinary disks (CBDs) form when part of the ejected envelope remains bound and circularizes around the stripped core and its companion. Leveraging results of scale-free hydrodynamical simulations, we develop a framework to model the effect of such disks on subsequent binary evolution, and implement it in the population synthesis code COMPAS.

Abstract We present a class of regular axisymmetric black hole geometries fully characterized by the parameters $$\{\mathcal{M},a\}$$ { M , a } and possessing the Kerr event horizon.

Transverse modulations and filamentation can turn extended wavefronts into structures of a finite transverse width. We examine the interaction of such a finite-width wave incident on a cold, uniform pair plasma using a three-dimensional kinetic particle-in-cell simulation.

We determine the convergence of quasi-normal modes sums for a point-particle plunging into a Schwarzschild black hole.

In this work, we study which type could be the dominant by means of very high energy gamma rays and neutrinos.