# Robin Gravity

## TL;DR

This paper introduces a Robin boundary term for general relativity, extending boundary condition formulations and building on previous Neumann results, differing from mechanics and field theory.

## Contribution

It provides a novel Robin boundary term for general relativity, connecting Neumann and Dirichlet formulations in a gravitational context.

## Key findings

- Derived a Robin boundary term for general relativity.
- Connected Robin boundary conditions with previous Neumann results.
- Highlighted differences from mechanics and field theory boundary formulations.

## Abstract

We write down a Robin boundary term for general relativity. The construction relies on the Neumann result of arXiv:1605.01603 in an essential way. This is unlike in mechanics and (polynomial) field theory, where two formulations of the Robin problem exist: one with Dirichlet as the natural limiting case, and another with Neumann.