# Comments on Squashed-sphere Partition Functions

## TL;DR

This paper investigates how the free energy of odd-dimensional conformal field theories varies on squashed spheres, revealing universal quadratic behavior linked to the energy-momentum tensor two-point function and exploring holographic duals.

## Contribution

It provides a detailed analysis of the free energy dependence on squashing deformations in odd-dimensional CFTs, including explicit calculations and universality observations across different theories.

## Key findings

- Round sphere is a local extremum of free energy.
- Quadratic correction proportional to $C_T$ coefficient.
- Universal near-quadratic dependence observed across theories.

## Abstract

We study the partition function of odd-dimensional conformal field theories placed on spheres with a squashed metric. We establish that the round sphere provides a local extremum for the free energy which, in general, is not a global extremum. In addition, we show that the leading quadratic correction to the free energy around this extremum is proportional to the coefficient, $C_T$, determining the two-point function of the energy-momentum tensor in the CFT. For three-dimensional CFTs, we compute explicitly this proportionality constant for a class of squashing deformations which preserve an $SU(2)\times U(1)$ isometry group on the sphere. In addition, we evaluate the free energy as a function of the squashing parameter for theories of free bosons, free fermions, as well as CFTs holographically dual to Einstein gravity with a negative cosmological constant. We observe that, after suitable normalization, the dependence of the free energy on the squashing parameter for all these theories is nearly universal for a large region of parameter space and is well approximated by a simple quadratic function arising from holography. We generalize our results to five-dimensional CFTs and, in this context, we also study theories holographically dual to six-dimensional Gauss-Bonnet gravity.