A Primer on Unimodular Gravity

Abstract

This chapter provides an introduction to Unimodular Gravity both at the classical and quantum level, discussing the rôle it might play in the partial solution of the Cosmological Constant problem. The main objective of this work is to serve as a conceptual introduction to Unimodular gravity without disregarding computational detail. In that sense, techniques used at the research level are presented and applied in detail.

40 pages, Invited chapter for "Handbook of Quantum Gravity" (Eds. C. Bambi, L. Modesto, and I. L. Shapiro, Springer 2023). Minor typos corrected

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