Work

Particle motions and gravitational lensing in de Rham-Gabadadze-Tolley massive gravity theory

Year: 2019

Type: article

Abstract: We investigate gravitational lensing and particle motions around nonasymptotically flat black hole spacetime in nonlinear, ghost-free massive gravity theory, called de Rham-Gabadadze-Tolley (dRGT) massive gravity. Deflection angle formulas are derived in terms of perihelion parameter. The deflection angle can be positive, zero or even negative with various perihelion distance. The negative angle reveals repulsive behavior of gravity from a linear term $\ensuremath{\gamma}$ in the dRGT black hole solution. We also find an analytically approximated formula of deflection angle in two regimes: large and small $\ensuremath{\gamma}$ term regimes which are shown to be consistent with direct numerical integration. Null and timelike geodesic motions on an equatorial plane are explored. Particle trajectories around the dRGT black hole are plotted and discussed in detail.

Source: Physical review. D/Physical review. D.

DOI: 10.1103/physrevd.100.044031

Authors: Sirachak Panpanich, Supakchai Ponglertsakul, Lunchakorn Tannukij

Institutions: Chulalongkorn University, Hanyang University

Language: English

Topic: Cosmology and Gravitation Theories

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: Chulalongkorn University, Ministry of Science, ICT and Future Planning, National Research Foundation of Korea

Awards: G2795646695, G3120564011