Tidal heating of black holes and exotic compact objects on the brane

TL;DR

This paper investigates how extra dimensions influence tidal heating in black holes and exotic compact objects, revealing potential constraints on extra-dimensional effects through gravitational wave observations.

Contribution

It introduces the impact of extra dimensions on tidal heating and proposes methods to constrain extra-dimensional parameters using gravitational wave data.

Findings

Tidal charge from extra dimensions can be constrained to ~10^{-6}.

Exotic compact objects show oscillatory tidal heating signatures with spin.

Gravitational wave phase information can reveal extra-dimensional effects.

Abstract

During the early phase of in-spiral of a binary system, the tidal heating of a compact object due to its companion plays a significant role in the determination of the orbital evolution of the binary. The phenomenon depends crucially on the `hairs', as well as on the nature of the compact object. It turns out that the presence of extra dimension affects both these properties, by incorporating an extra tidal charge for braneworld black holes and also by introducing quantum effects, leading to possible existence of exotic compact objects. It turns out that the phasing information from tidal heating in the gravitational wave waveform can constrain the tidal charge inherited from extra dimension to a value $\sim 10^{-6}$, the most stringent constraint, to date. Moreover, second order effects in tidal heating for exotic compact objects, also reveals an oscillatory behaviour with respect to spin, which has unique signatures.