Results 51 to 60 of about 3,682 (109)
Falling into the Past: Geodesics in a Time Travel Metric
UniverseWe investigate timelike and null geodesics within the rotating “time machine” spacetime proposed by Ralph, T.C.; et al. Phys. Rev. D 2020, 102, 124013. This is a rotating analogue of Alcubierre’s warp drive spacetime.
Colin MacLaurin +2 more
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UniverseSwarm intelligence (SI) methods are nature-inspired metaheuristics for global optimization that exploit a coordinated stochastic search strategy by a group of agents.
Xiao-Bo Zou +3 more
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A Systematic Study of Two-Neutrino Double Electron Capture
UniverseIn this paper, we update the phase-space factors for all two-neutrino double electron capture processes. The Dirac–Hartree–Fock–Slater self-consistent method is employed to describe the bound states of captured electrons, enabling a more realistic ...
Ovidiu Niţescu +3 more
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Pulsation in Hot Main-Sequence Stars: Comparison of Observations with Models
UniverseThe locations of hot pulsating variables in the H–R diagram are found using the effective temperatures derived from spectroscopic analysis and luminosities from Gaia parallaxes.
Luis A. Balona
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Jet Precession in Gamma-Ray Bursts
UniverseJet precession is thought to be a ubiquitous phenomenon in astronomical events of various scales, including gamma-ray bursts (GRBs). If GRB jets undergo precession, periodic features might be introduced into their light curves.
Bao-Quan Huang, Tong Liu
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CESE Schemes for Solar Wind Plasma MHD Dynamics
UniverseMagnetohydrodynamic (MHD) numerical simulation has emerged as a pivotal tool in space physics research, witnessing significant advancements. This methodology offers invaluable insights into diverse space physical phenomena based on solving the ...
Yun Yang, Huichao Li
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The Two Alternative Explosion Mechanisms of Core-Collapse Supernovae: 2024 Status Report
UniverseIn comparing the two alternative explosion mechanisms of core-collapse supernovae (CCSNe), I examine recent three-dimensional (3D) hydrodynamical simulations of CCSNe in the frame of the delayed neutrino explosion mechanism (neutrino mechanism) and argue
Noam Soker
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Dynamical Systems Analysis of Timelike Geodesics in a Lorentz-Violating Black Hole Spacetime
UniverseThis paper investigates the global dynamics of timelike geodesics of a spherically symmetric black hole under Lorentz-violating effects governed by parameters λ (scaling exponent) and Υ (Lorentz violation strength).
Aqeela Razzaq, Jianwen Liu, Fabao Gao
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UniverseThe star formation rate (SFR) is a crucial astrophysical characteristic for understanding the formation and evolution of galaxies, determining the interplay between the interstellar medium and stellar activity. The mainstream approach to studying stellar
Yaosong Yu +4 more
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