Inflationary predictions of Geometric Inflation

Arciniega, Gustavo; Jaime, Luisa; Piccinelli, Gabriella

doi:10.48550/arxiv.2001.11094

Cited by 2 publications

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“…One can even obtain late time acceleration by turning on a cosmological constant, irrelevant during the inflationary epoch due to the strongly increasing behavior of ρ rad ∝ a −4 as the scale factor decreases. Further interesting results in this framework include [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Aspects of Geometric Inflation

Edelstein,

Rodríguez,

López

2020

Preprint

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We revisit the recently proposed mechanism of Geometric Inflation. On general grounds, we show that obtaining the right amount of inflation demands an exceedingly large initial energy density. We introduce a scalar field and study the combined action of both mechanisms. Besides fixing the aforementioned issue, a cascading process occurs whose last step seems undistinguishable from ordinary large field inflation. Strikingly, the scalar field remains approximately constant while Geometric Inflation rules the dynamics. This ultimately leads to the possibility of reducing the initial value of the scalar field and its excursion. We discuss the main features of this hybrid scenario.

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Section: Introductionmentioning

confidence: 99%

Aspects of Geometric Inflation

Edelstein,

Rodríguez,

López

2020

Preprint

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“…Interestingly enough, the inclusion of radiation -actually, any barotropic fluid for that matter-triggers a novel mechanism of cosmological accelerated expansion of the universe called Geometric Inflation, without the need to invoke a scalar field (see, also, [13]). Several features of this scenario were considered in [14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Small free field inflation in higher curvature gravity

Edelstein,

Mann,

Rodríguez

et al. 2020

Preprint

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Within General Relativity, a minimally coupled scalar field governed by a quadratic potential is able to produce an accelerated expansion of the universe provided its value and excursion are larger than the Planck scale. This is an archetypical example of the so called large field inflation models. We show that by including higher curvature corrections to the gravitational action in the form of the Geometric Inflation models, it is possible to obtain accelerated expansion with a free scalar field whose values are well below the Planck scale, thereby turning a traditional large field model into a small field one. We provide the conditions the theory has to satisfy in order for this mechanism to operate, and we present two explicit models illustrating it. Finally, we present some open questions raised by this scenario in which inflation takes place completely in a higher curvature dominated regime, such as those concerning the study of perturbations.

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Inflationary predictions of Geometric Inflation

Cited by 2 publications

References 0 publications

Aspects of Geometric Inflation

Aspects of Geometric Inflation

Small free field inflation in higher curvature gravity

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