Bounds on the Effective Theory of Gravity in Models of Particle Physics and Cosmology

Atkins, Michael

doi:10.1007/978-3-319-06367-6

Cited by 1 publication

(2 citation statements)

References 89 publications

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“…In this section we will be calculating the tree level four point graviton scattering amplitude to set further constraints on (m, β). For a comprehensive account on the issues related to the bounds imposed on the non-minimal couplings of different gravity models, see [22]. It is known, to achieve adequate amount of density perturbations one usually needs to consider a large value of the coupling constant for models involving higher curvature couplings [23,24].…”

Section: Analyzing Unitarity In Scalar-gb Theorymentioning

confidence: 99%

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Constraining scalar-Gauss-Bonnet inflation by reheating, unitarity, and Planck data

2017

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We revisit the inflationary dynamics in detail for theories with Gauss-Bonnet gravity coupled to scalar functions, in light of the Planck data. Considering the chaotic inflationary scenario, we constrain the parameters of two models involving inflaton-Gauss-Bonnet coupling by current Planck data. For non zero inflaton-Gauss-Bonnet coupling β, an inflationary analysis provides us a big cosmologically viable region in the space of (m, β), where m is the mass of inflaton. However, we study further on constraining β arising from reheating considerations and unitarity of tree-level amplitude involving we have studied the constraints on β arising from reheating considerations and unitarity of tree level amplitude involving 2 graviton → 2 graviton (hh → hh) scattering. Our analysis, particularly on reheating significantly reduces the parameter space of (m, β) for all models. he quadratic Gauss-Bonnet coupling parameter turns out to be more strongly constrained than that of the linear coupling. For the linear Gauss-Bonnet coupling function, we obtain β 10 3 , with the condition β(m/M P ) 2

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Section: Analyzing Unitarity In Scalar-gb Theorymentioning

confidence: 99%

“…Also it is easy to see due to the gauge constraint (22) these polarization vectors must satisfy the following relations,…”

Section: Analyzing Unitarity In Scalar-gb Theorymentioning

confidence: 99%

Constraining scalar-Gauss-Bonnet inflation by reheating, unitarity, and Planck data

2017

View full text Add to dashboard Cite

show abstract

Bounds on the Effective Theory of Gravity in Models of Particle Physics and Cosmology

Cited by 1 publication

References 89 publications

Constraining scalar-Gauss-Bonnet inflation by reheating, unitarity, and Planck data

Constraining scalar-Gauss-Bonnet inflation by reheating, unitarity, and Planck data

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