Inflation with Gauss–Bonnet and Chern–Simons higher-curvature-corrections in the view of GW170817

Venikoudis, S. A.; Fronimos, F. P.

doi:10.1007/s10714-021-02846-8

Cited by 11 publications

(6 citation statements)

References 64 publications

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“…In this paper it is demonstrated the phenomenology of the late-time Universe of a given scalar-tensor theory in the context of string-inspired gravity, see Ref. [47][48][49][50][51][52][53]. The theory involves a scalar field which is minimally coupled with the Ricci scalar and a function f (G) solely depending from the Gauss-Bonnet topological invariant G, representing higher curvature corrections and assists the accelerating expansion.…”

Section: Introductionmentioning

confidence: 99%

Late-time Cosmology of scalar field assisted $f(\mathcal{G})$ gravity

Venikoudis,

Fasoulakos,

Fronimos

2022

Preprint

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In this work we present the late-time behaviour of the Universe in the context of Einstein-Gauss-Bonnet gravitational theory. The theory involves a scalar field, which represents low-effective quantum corrections, assisted by a function f (G) solely depending from the Gauss-Bonnet topological invariant G. It is considered that the dark energy serves as the impact of all geometric terms, which are included in the gravitational action and the density of dark energy acts as a time dependent cosmological constant evolving with an infinitesimal rate and driving the Universe into an accelerating expansion. We examine two cosmological models of interest. The first involves a canonical scalar field in the presence of a scalar potential while the second, involves a scalar field which belongs to a generalized class of theories f (φ, X) namely the k-essence scalar field in the absence of scalar potential. As it is proved, the aforementioned models are in consistency with the latest Planck data and in relatively good agreement with the ΛCDM standard cosmological model. The absence of dark energy oscillations at the early stages of matter dominated era, which appear in alternative scenarios of cosmological dynamics in the context of modified f (R) gravitational theories, indicates an advantage of the theory for the interpretation of late-time phenomenology.

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Section: Introductionmentioning

confidence: 99%

Late-time Cosmology of scalar field assisted $f(\mathcal{G})$ gravity

Venikoudis,

Fasoulakos,

Fronimos

2022

Preprint

Self Cite

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show abstract

“…Indicatively, the inflationary phenomenology in the presence of the Gauss-Bonnet term has been presented in Ref. [46][47][48][49][50][51][52][53][54][55][56][57]. Before we proceed however, it is worth justifying the reasoning behind such constraint in the Gauss-Bonnet scalar coupling function in Eq.…”

Section: Inflationary Phenomenology In Einstein-gauss-bonnet Gravity ...mentioning

confidence: 99%

Reheating era in Gauss-Bonnet theories of gravity compatible with the GW170817 event

Venikoudis

Fronimos

2022

Nuclear Physics B

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“…For previous works concerning the compatibility of Einstein-Gauss-Bonnet theories with the GW170817 see Refs. [30][31][32][33]. The main feature of this compatibility is that primordial gravitons must be retained massless.…”

Section: Introductionmentioning

confidence: 99%

Swampland criteria for rescaled Einstein-Hilbert gravity with string corrections

Gitsis¹,

Revis²,

Venikoudis³

et al. 2023

Preprint

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In this work we examine the Swampland criteria for a specific class of rescaled f (R) gravitational models, that are capable of unifying the primordial era of the Universe with the late-time era with the inclusion of string corrections. In particular, we develop separately the theoretical framework of Gauss-Bonnet and Chern-Simons theories considering that, the rescale parameter is constrained to reside in the area 0 < α < 1. As showcased, in the context of the aforementioned theories, a viable inflationary phenomenology consistent with the latest Planck data can be obtained for both cases for a wide variety of values. The Swampland criteria which where examined are satisfied, not necessarily simultaneously, for small values of the rescale parameter, which is in agreement with the case of a canonical scalar field with absent string corrective terms. The Gauss-Bonnet model is also further constrained, in order to obtain a propagation velocity of tensor perturbations which coincides with that of light, according to the recent observations from the GW170817. As a result of this assumption the degrees of freedom of the theory are reduced. An interesting feature which arises from the overall phenomenology is that, due to the inclusion of string corrections the tensor spectral index of primordial perturbations is now capable of obtaining a positive value which is not possible in the case of the canonical scalar field. Last but not least, the power-law model which is known to be incompatible with observations is now rendered viable by including a parity violating term and as showcased, it satisfies the Swampland criteria as well.

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Inflation with Gauss–Bonnet and Chern–Simons higher-curvature-corrections in the view of GW170817

Cited by 11 publications

References 64 publications

Late-time Cosmology of scalar field assisted $f(\mathcal{G})$ gravity

Late-time Cosmology of scalar field assisted $f(\mathcal{G})$ gravity

Reheating era in Gauss-Bonnet theories of gravity compatible with the GW170817 event

Swampland criteria for rescaled Einstein-Hilbert gravity with string corrections

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