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Gauge invariance and non-Gaussianity in Inflation

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arxiv 1104.0292 v2 pith:PMZH72WS submitted 2011-04-02 astro-ph.CO gr-qchep-th

Gerasimos Rigopoulos This is my paper · ORCID
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keywords gaugeinflationinvariancenon-gaussianityboundarychoiceclarifycomment
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abstract

We clarify the role of gauge invariance for the computation of quantum non-Gaussian correlators in inflation. A gauge invariant generating functional for n-point functions is given and the special status of the spatially flat gauge is pointed out. We also comment on the relation between gauge transformations, field redefinitions, the choice of $t={\rm const}$ hypersurfaces and the use of boundary terms in computations of non-Gaussianity.

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  1. Primordial non-Gaussianities of scalar and tensor perturbations in general bounce cosmology: Evading the no-go theorem

    gr-qc 2019-08 conditional novelty 6.0 of 10

    In Horndeski gravity, matter bounce models can simultaneously satisfy the tensor-to-scalar ratio bound and non-Gaussianity constraints, evading a no-go theorem that applies to k-essence bounce models.

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