Action, Mass and Entropy of Schwarzschild-de Sitter black holes and the de Sitter/CFT Correspondence

TL;DR

This paper explores the conserved mass, action, and entropy of Schwarzschild-de Sitter black holes within the framework of the de Sitter/CFT correspondence, extending holographic techniques to higher dimensions and addressing divergences in the on-shell action.

Contribution

It derives explicit forms for conserved quantities in asymptotically de Sitter spacetimes up to 9 dimensions and generalizes entropy definitions, supporting the dS/CFT duality.

Findings

Divergences in the on-shell action are removable in inflationary coordinates.

Schwarzschild-de Sitter black holes have finite action and conserved mass up to 9 dimensions.

Entropy outside the cosmological horizon matches CFT results in 2D.

Abstract

We investigate a recent proposal for defining a conserved mass in asymptotically de Sitter spacetimes that is based on a conjectured holographic duality between such spacetimes and Euclidean conformal field theory. We show that an algorithm for deriving such terms in asymptotically anti de Sitter spacetimes has an asymptotically de Sitter counterpart, and derive the explicit form for such terms up to 9 dimensions. We show that divergences of the on-shell action for de Sitter spacetime are removed in any dimension in inflationary coordinates, but in covering coordinates a linear divergence remains in odd dimensions that cannot be cancelled by local terms that are polynomial in boundary curvature invariants. We show that the class of Schwarzschild-de Sitter black holes up to 9 dimensions has finite action and conserved mass, and construct a definition of entropy outside the cosmological horizon by generalizing the Gibbs-Duhem relation in asymptotically dS spacetimes. The entropy is agreement with that obtained from CFT methods in $d=2$. In general our results provide further supporting evidence for a dS/CFT correspondence, although some important interpretive problems remain.