Tag: Gravitation
Interacting dark energy and dark matter models fit current data
What the study found The study found that two versions of a cosmological model with interacting dark energy and dark matter can fit current observations well. The models use a Gauss–Bonnet-coupled scalar field as dark energy and a fermionic dark matter field, with either an exponential or a power-law scalar potential. Why the authors say…
BAGLE adds binary lens and source models for microlensing
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in AstrophysicsWhat the study found The BAGLE Python software package now includes models for binary sources and binary lenses in gravitational microlensing. These models include Keplerian orbits, as well as simpler descriptions of orbital motion such as acceleration, linear, or stationary motion of the secondary companion. Why the authors say this matters The authors say these…
Particle creation model explains cosmic expansion without dark energy
What the study found A dark-energy-free cosmological model based on gravitationally induced adiabatic particle creation is proposed. The authors report that it can reproduce a Lambda CDM-like expansion for suitable values of its parameters and that it evolves smoothly between two de Sitter phases. Why the authors say this matters The authors conclude that the…
Lorentz violation changes black hole disk images and polarization
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in AstrophysicsObservable signatures of Lorentz violation in Hořava gravity revealed through black hole accretion disk images and polarization patterns, testable with future Event Horizon Telescope observations.
Magnetic charge changes orbits and waveforms near regular black holes
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in AstrophysicsStudy explores how magnetic charge in regular black holes alters gravitational waveforms from periodic orbits, offering new constraints on black hole properties through gravitational wave.
Separability of gravitational wave equations in rotating black hole geometries
Analytical study of gravitational wave propagation in Myers-Perry higher-dimensional rotating black holes using separation of variables techniques to derive explicit solutions.
