Nernst branes from special geometry

TL;DR

This paper constructs new black brane solutions in gauged supergravity that satisfy the Nernst Law, interpolate between different geometries, and connect to known extremal Nernst branes at zero temperature.

Contribution

It introduces analytical solutions in special geometry with specific thermodynamic and geometric properties, expanding the understanding of Nernst branes in supergravity.

Findings

Solutions have entropy density s ~ T^{1/3} as T→0.

Interpolates between hyperscaling violating Lifshitz geometries with different parameters.

Recovers extremal Nernst branes with (z,θ)=(3,1) at zero temperature.

Abstract

We construct new black brane solutions in $U(1)$ gauged ${\cal N}=2$ supergravity with a general cubic prepotential, which have entropy density $s\sim T^{1/3}$ as $T \rightarrow 0$ and thus satisfy the Nernst Law. By using the real formulation of special geometry, we are able to obtain analytical solutions in closed form as functions of two parameters, the temperature $T$ and the chemical potential $\mu$. Our solutions interpolate between hyperscaling violating Lifshitz geometries with $(z,\theta)=(0,2)$ at the horizon and $(z,\theta)=(1,-1)$ at infinity. In the zero temperature limit, where the entropy density goes to zero, we recover the extremal Nernst branes of Barisch et al, and the parameters of the near horizon geometry change to $(z,\theta)=(3,1)$.