Superfluid Black Holes

TL;DR

This paper reports the discovery of a novel continuous phase transition in certain black holes, resembling superfluidity, occurring in a specific class of hairy black holes within Lovelock gravity.

Contribution

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Findings

Identification of a $\

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Abstract

We present what we believe is the first example of a "$\lambda$-line" phase transition in black hole thermodynamics. This is a line of (continuous) second order phase transitions which in the case of liquid $^4$He marks the onset of superfluidity. The phase transition occurs for a class of asymptotically AdS hairy black holes in Lovelock gravity where a real scalar field is conformally coupled to gravity. We discuss the origin of this phase transition and outline the circumstances under which it (or generalizations of it) could occur.