10th International Conference on Gravitation and Cosmology: New Horizons and Singularities in Gravity (ICGC 2023)

Gravitational Red-shift of emitted photons and frame dragging from Bardeen black hole in presence of clouds of string

Not scheduled

15m

IIT Guwahati

Poster Classical & Quantum Gravity Classical & Quantum Gravity

Speaker

BIJENDRA KUMAR VISHVAKARMA (Banaras Hindu University)

Description

An investigation has been done on the gravitational red-shift and blue-shift of photons emitted by time-like geodesics orbiting in the regular Bardeen black hole in the presence of clouds of strings. As the particles/gas are orbiting in a black hole in space-time, they emit light that travels along null geodesics towards the point of detection (observer). In terms of killing vector formalism and first integrals of motion (E and L), the expressions of the redshift and frame dragging have been obtained. The black hole parameters for the redshift of photons ejected from massive particles orbiting in the vicinity of regular black holes are subject to observational constraints. The mass and charge parameters have been calculated in terms of the gravitational red/blue shifts and compared with observational data.
Keywords: Bardeen black hole, Time-like geodesics, Gravitational Red-shift, Frame dragging

References:

1. GRAVITY Collaboration, R. Abuter, et al. (arXiv:1807.09409)
2. G. He, C. Pan, X. Zhou, W. Li, L. Li, Eur. Phys. J. C 80 512 (2020)
3. A. Herrera-Aguilar and U. Nucamendi, Phys. Rev. D 92 045420 (2015)
4. G. V. Kraniotis, Eur. Phys. J. C 81 147 (2021)
5. R. Becirril, S.V. Alvarado, U. Nucamendi, P. Sheoran and J. M. Davila, Phys. Rev. D 103 084054 (2021)