5 research outputs found
Traversable wormholes in bi-metric gravity
The ghost-free bi-metric gravity theory is a viable theory of gravity that
explores the interaction between a massless and a massive graviton and can be
described in terms of two dynamical metrics. In this paper, we present an exact
static, spherically symmetric vacuum solution within this theory. The solution
is spatially Schwarzschild-de Sitter, with the value of the cosmological
constant determined by the graviton mass and the interaction parameters of the
theory. Notably, for specific parameter ranges, the solution represents a
traversable Lorentzian wormhole that violates the weak energy condition near
its throat. Furthermore, we have investigated the evolution of scalar and
electromagnetic fields in this wormhole spacetime and observed the presence of
arbitrarily long-lived quasi-resonant modes in the quasinormal spectrum.Comment: 14 pages, 7 figure