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New action for cosmology

Research output: Contribution to journalJournal articlepeer-review

Article number043524
<mark>Journal publication date</mark>15/02/2021
<mark>Journal</mark>Physical Review D
Issue number4
Number of pages11
Publication StatusPublished
<mark>Original language</mark>English


We present a new action which reproduces the cosmological sector of general relativity in both the Friedmann-Lemaître-Robertson-Walker and Bianchi models. This action makes no reference to the scale factor and is of a frictional type first examined by Herglotz. We demonstrate that the extremization of this action reproduces the usual dynamics of physical observables, and the symplectification of this action is the Einstein-Hilbert action for cosmological models. We end by discussing some of the increased explanatory power produced by considering the reduced physical ontology resulting from eliminating scale.

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© 2021 American Physical Society