A5045875026- Black Holes and Theoretical Physics
- Cosmology and Gravitation Theories
- Astrophysical Phenomena and Observations
- Relativity and Gravitational Theory
- Quantum Electrodynamics and Casimir Effect
- Pulsars and Gravitational Waves Research
- Advanced Thermodynamics and Statistical Mechanics
- Noncommutative and Quantum Gravity Theories
- Thermal Radiation and Cooling Technologies
- Geophysics and Sensor Technology
- Stellar, planetary, and galactic studies
- Experimental and Theoretical Physics Studies
- Sports Dynamics and Biomechanics
- Quantum Mechanics and Applications
- Planetary Science and Exploration
Universidade Federal do Pará
2020-2024
We discuss the emission of radiation from general sources in quantum scalar, electromagnetic and gravitational fields using Rindler coordinate frame, which is suitable for a uniformly accelerated observer, Minkowski vacuum. In particular, we point out that, to recover usual Larmor interaction picture, it necessary incorporate Unruh effect. Thus, observation classical could be seen as vindicating effect sense that not correctly reproduced this context unless taken into account.
We analyze the scalar radiation emitted by a source in geodesic circular orbits around Schwarzschild--de Sitter black hole. obtain power using quantum field theory curved spacetimes framework at tree level. compare our results with synchrotron Schwarzschild spacetime.
We analyze the scalar radiation emitted by a source interacting with nonminimally coupled field in four-dimensional Schwarzschild--de Sitter spacetime. obtain emission probability using quantum theory curved spacetimes at tree level. find that emits synchrotron-type for orbits near photon sphere all allowed values of parameters. also power strongly depends on coupling to curvature scalar. In particular, previously observed enhancement contribution lower multipoles this spacetime minimal is...
The electromagnetic radiation emitted by an accelerated charged particle can be described theoretically as the interaction of charge with so-called Fulling-Davies-Unruh thermal bath in coordinate frame co-accelerated charge. We present a similar analysis on gravitational from classical point mass uniformly accelerated, being pulled string satisfying weak energy condition. In particular, we derive rate (with fixed transverse momentum) this system and show that it equals graviton emission...
A semiclassical investigation of the electromagnetic radiation emitted by a charged particle in radially freely falling motion Schwarzschild spacetime is carried out. We use quantum field theory at tree level to obtain one-particle-emission amplitudes. analyze and compare energy spectrum total released, which are calculated from these amplitudes, for particles with varying initial positions originating infinity kinetic energy. also results those due "string" extended radial direction.
We study the scalar radiation emitted by a source orbiting Schwarzschild--anti--de Sitter black hole in circular geodesics. obtain power using quantum field theory curved spacetimes at tree level with reflective boundary conditions infinity. compare our results ones obtained Schwarzschild and Schwarzschild--de ($\mathrm{\ensuremath{\Lambda}}>0$) spacetimes. In spacetime we observe an enhancement of associated to lower multipole modes, when compared case. contrast, for spacetime, is rather...
Resumo O movimento de partículas-teste pode ser analisado usando-se as ferramentas da Teoria Relatividade Geral. Algumas verificações clássicas desta teoria envolvem trajetórias no espaço-tempo esfericamente simétrico associado à solução Schwarzschild. Um outro com esta simetria é o descrito pela Reissner-Nordström, associada a uma distribuição esférica massa e carga elétrica como, por exemplo, um buraco negro carregado. Neste espaço-tempo, analisamos partículas livres, quais seguem...
We study the scalar radiation emitted by a source orbiting Schwarzschild--anti--de Sitter black hole in circular geodesics. obtain power using quantum field theory curved spacetimes at tree level with reflective boundary conditions infinity. compare our results ones obtained Schwarzschild and Schwarzschild--de ($\Lambda > 0$) spacetimes. In Schwarzschild-de spacetime we observe an enhancement of associated to lower multipole modes, when compared case. contrast, for Schwarzschild-anti-de...
The electromagnetic radiation emitted by an accelerated charged particle can be described theoretically as the interaction of charge with so-called Fulling-Davies-Unruh thermal bath in coordinate frame co-accelerated charge. We present a similar analysis on gravitational from classical point mass uniformly accelerated, being pulled string satisfying weak energy condition. In particular, we derive rate (with fixed transverse momentum) this system and show that it equals graviton emission...