Cosmological horizons from classical double copy

Abstract

The classical doubly copy provides relations between classical solutions in gravitational theories and solutions in gauge theories. In this paper, we consider the cosmological horizons in the gravity side from the perspective of gauge theories in the classical double copy paradigm. After introducing the double copy procedure, we give several examples to show how to locate the cosmological horizons by using only the single- and zeroth-copy data on the base spacetime. It is found that the proposed double copy procedure holds not only for the case with flat base spacetime but also for the case with curved base spacetime.