Cosmological perturbations in generalised dark Lagrangians

Edholm, James (0000 0000 8190 6402, Consortium for Fundamental Physics, Physics Department, Lancaster University, Bailrigg, Lancaster, LA1 4YW, U.K.) (0000 0000 8700 0572, Centre for Particle Theory, Department of Mathematical Sciences, Durham University, South Road, Durham, DH1 3LE, U.K.) ; Pearson, Jonathan (0000 0000 8190 6402, Consortium for Fundamental Physics, Physics Department, Lancaster University, Bailrigg, Lancaster, LA1 4YW, U.K.)

29 November 2018

Abstract: We describe a new method to parameterise dark energy theories including massive gravity, elastic dark energy and tensor-metric theories. We first examine the existing framework which describes any second order Lagrangian which depends on the variation of the metric and find new constraints on the parameters. We extend the method to Lorentz violating theories which depend on the variation of the time and spatial parts of the metric separately. We show how this can describe massive gravity and elastic dark energy, while ruling out the whole class of theories where the Lagrangian depends only on the variation of the time part of the metric.


Published in: JHEP 1811 (2018) 180
Published by: Springer/SISSA
DOI: 10.1007/JHEP11(2018)180
arXiv: 1810.06582
License: CC-BY-4.0



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