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Extended Effective Field Theory of Inflation

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arxiv 1802.03040 v2 pith:STNAPYFB submitted 2018-02-08 hep-th astro-ph.COgr-qc

Amjad Ashoorioon , Roberto Casadio , Michele Cicoli , Ghazal Geshnizjani , Hyung J. Kim This is my paper · ORCID
classification hep-thastro-ph.COgr-qc
keywords fieldeffectiveextendedinflationoperatorstheorydimensionalhigher
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We present a general framework where the effective field theory of single field inflation is extended by the inclusion of operators with mass dimension 3 and 4 in the unitary gauge. These higher dimensional operators introduce quartic and sextic corrections to the dispersion relation. We study the regime of validity of this extended effective field theory of inflation and the effect of these higher dimensional operators on CMB observables associated with scalar perturbations, such as the speed of sound, the amplitude of the power spectrum and the tensor-to-scalar ratio. Tensor perturbations remain instead, unaltered.

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  1. Extended Effective Field Theory of Dark Energy: Ghost Condensate Dark Energy with Sextic Dispersion Relation in de Sitter Spacetime

    hep-th 2025-02 conditional novelty 5.0 of 10

    A sextic ghost condensate dark energy model is shown to produce a matter-density-dependent correction to the Newtonian potential and a frequency-dependent gravitational wave speed in de Sitter spacetime.

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