Covariant Noether charges for type IIB and 11-dimensional supergravities

TL;DR

This paper develops a covariant Noether charge formalism for Type IIB and 11-dimensional supergravities, establishing conditions under which thermodynamic charges are well-defined and demonstrating this with explicit supergravity solutions.

Contribution

It derives an expression for the variation of covariant Noether charges in supergravity, showing integrability and thermodynamic consistency for asymptotically scale-invariant solutions.

Findings

Thermodynamic charges are well-defined for asymptotically scale-invariant solutions.

The first law of thermodynamics and Smarr relation are satisfied for these solutions.

Explicit calculations on supergravity solutions confirm the theoretical framework.

Abstract

The covariant Noether charge formalism (also known as the covariant phase method) of Wald and collaborators, including its cohomological extension, is a manifestly covariant Hamiltonian formalism that, in principle, allows one to define and compute the energy, angular momenta, and chemical potentials of generic solutions of gravitational theories. However, it has been observed that for some supergravity solutions the variation of the Noether charge is not (at least manifestably) integrable, and as a result it is unclear whether there are well-defined thermodynamic charges for these solutions. In this work, we derive an expression for the variation of the covariant Noether charges for any solution of Type IIB 10-dimensional supergravity or 11-dimensional supergravity. Although this Noether quantity is not integrable in general, we show that for asymptotically scale-invariant solutions, it is. In particular, the asymptotic scale-invariance allows one to define an energy density and conjugate chemical potentials which obey a first law of thermodynamics and a Smarr relation. These two thermodynamic relations can then be shown to imply that the variation of the Noether charge is integrable, and accordingly the energy and other thermodynamic charges may be defined unambiguously. We explicitly demonstrate and illustrate our claim by computing the thermodynamic charges of two non-trivial supergravity solutions that were recently constructed: 1) the Polchinski-Strassler black brane that is dual to the deconfined phase of $\mathcal{N}=1^*$ theory, and 2) the CGLP black brane that asymptotes to the mass deformed Cveti\v{c}-Gibbons-L\"u-Pope (CGLP) solution.