Electromagnetic radiation from circular orbits in Schwarzschild--de Sitter spacetime

Abstract

We investigate the electromagnetic radiation emitted by a charged particle orbiting a four-dimensional Schwarzschild--de Sitter black hole using a semiclassical approach. We calculate the probability amplitude for the charged particle to emit a photon, from which we derive the emitted power and spectral distributions. The results are compared with those obtained for scalar fields, considering both minimal and nonminimal coupling, as well as the corresponding electromagnetic case in the Schwarzschild spacetime. It is found that the total electromagnetic power is approximately twice that of the scalar field with conformal coupling for orbits with low angular velocity, similar to the Schwarzschild case, whereas for minimal coupling, the scalar power can even exceed the electromagnetic power. We also investigate the spectral distributions and possible synchrotron emission by orbits near the photon sphere. The electromagnetic case has a much broader frequency spectrum, with a non-negligible lower multipole contribution.

11 pages, 10 figures

References in corpus (23)

• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• Measurements of Omega and Lambda from 42 High-Redshift Supernovae
• Observation of Gravitational Waves from a Binary Black Hole Merger
• First M87 Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole
• The Cosmological Constant
• First Sagittarius A* Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole in the Center of the Milky Way
• Relativistic Dynamics and Extreme Mass Ratio Inspirals
• Quantization of the electromagnetic field outside static black holes and its application to low-energy phenomena
• Extreme black hole simulations: collisions of unequal mass black holes and the point particle limit
• X-MRIs: Extremely Large Mass-Ratio Inspirals
• Scalar radiation emitted from a source rotating around a black hole
• Light-bending in Schwarzschild-de-Sitter: projective geometry of the optical metric
• Semiclassical approach to black hole absorption of electromagnetic radiation emitted by a rotating charge
• Interaction of Hawking radiation and a static electric charge
• Gravitational waves emitted by a particle rotating around a Schwarzschild black hole: A semiclassical approach
• Scalar radiation from a source rotating around a regular black hole
• Synchrotron geodesic radiation in Schwarzschild-de Sitter spacetime
• Interaction of Hawking radiation with static sources in deSitter and Schwarzschild-deSitter spacetimes
• Quantum Larmor radiation in de Sitter spacetime
• On radiation due to homogeneously accelerating sources
• Radiation emitted by a source orbiting a Schwarzschild--anti--de Sitter black hole
• Semiclassical bremsstrahlung from a charge radially falling into a Schwarzschild black hole
• Nonminimally coupled scalar field in Schwarzschild--de Sitter spacetime: Geodesic synchrotron radiation