Naslov
Torsion-induced gravitational θ term and gravitoelectromagnetism

Autori
Chatzistavrakidis, Athanasios ; Karagiannis, Georgios ; Schupp, Peter

Izvornik
European physical journal C : particles and fields (1434-6044) 80 (2020), 11; 1034, 6

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
torsion ; induced ; gravitoelectromagnetism

Sažetak
Motivated by the analogy between a weak field expansion of general relativity and Maxwell's laws of electrodynamics, we explore physical consequences of a parity violating θ term in gravitoelectromagnetism. This is distinct from the common gravitational θ term formed as a square of the Riemann tensor. Instead it appears as a product of the gravitoelectric and gravitomagnetic fields in the Lagrangian, similar to the Maxwellian θ term. We show that this sector can arise from a quadratic torsion term in nonlinear gravity. In analogy to the physics of topological insulators, the torsion-induced θ parameter can lead to excess mass density at the interface of regions where θ varies and consequently it generates a correction to Newton's law of gravity. We discuss also an analogue of the Witten effect for gravitational dyons.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA