One loop corrected conformally coupled scalar mode equations during inflation

Boran, Sibel; Kahya, E. O.; Park, Sohyun

doi:10.1103/physrevd.96.105003

Cited by 7 publications

(8 citation statements)

References 83 publications

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“…We should also comment on the work of Boran, Kahya and Park who studied the same system [56][57][58]. Their result for the self-mass was given in Ref.…”

Section: Discussionmentioning

confidence: 85%

“…The decaying logarithm does cause the time derivative of the conformally rescaled field to grow relative to its classical value, and that might be significant [55]. We should also comment on the work of Boran, Kahya and Park who studied the same system [56][57][58]. Their result for the self-mass was given in Ref.…”

Section: Discussionmentioning

confidence: 94%

“…Inverting equation (37) for sources (45)(46)(47)(48) and (56)(57)(58) we just computed yields the correction to the point source potential we are after. This is trivial for sources K 1 and K 5 -K 7 , as it simply involves dropping the overall ∂ 2 from the sources.…”

Section: Point Sourcementioning

confidence: 99%

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One loop graviton corrections to dynamical photons in de Sitter

Glavan¹,

Miao²,

Prokopec³

et al. 2017

Class. Quantum Grav.

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We employ a recent, general gauge computation of the one loop graviton contribution to the vacuum polarization on de Sitter to solve for one loop corrections to the photon mode function. The vacuum polarization takes the form of a gauge independent, spin 2 contribution and a gauge dependent, spin 0 contribution. We show that the leading secular corrections derive entirely from the spin 2 contribution.

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“…We should also comment on the work of Boran, Kahya and Park who studied the same system [56][57][58]. Their result for the self-mass was given in Ref.…”

Section: Discussionmentioning

confidence: 85%

Section: Discussionmentioning

confidence: 94%

See 1 more Smart Citation

One loop graviton corrections to dynamical photons in de Sitter

Glavan¹,

Miao²,

Prokopec³

et al. 2017

Class. Quantum Grav.

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“…Another independent motivation to study this scenario comes from string theory, where many scalars are (quasi-)conformally coupled to gravity[11] 3. See Refs [12][13][14]. for other related studies 4.…”

mentioning

confidence: 99%

“…Another way of achieving a viable value of r in natural inflation is by adding a sizable R 2 term in the Palatini formalism[69,70]. However, as pointed out in the introduction, such term largely breaks Weyl symmetry 14. See, however, Ref [71].…”

mentioning

confidence: 99%

Quasi-conformal models and the early universe

Salvio

2019

Eur. Phys. J. C

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Extensions of the Standard Model and general relativity featuring a UV fixed point can leave observable implications at accessible energies. Although mass parameters such as the Planck scale can appear through dimensional transmutation, all fundamental dimension-4 operators can (at least approximately) respect Weyl invariance at finite energy. An example is the Weyl-squared term, whose consistency and observational consequences are studied. This quasi-conformal scenario emerges from the UV complete quadratic gravity and is a possible framework for inflation. We find two realizations. In the first one the inflaton is a fundamental scalar with a quasiconformal non-minimal coupling to the Ricci scalar. In this case the field excursion must not exceed the Planck mass by far. An example discussed in detail is hilltop inflation. In the second realization the inflaton is a pseudo-Goldstone boson (natural inflation). In this case we show how to obtain an elegant UV completion within an asymptotically free QCD-like theory, in which the inflaton is a composite scalar due to new strong dynamics. We also show how efficient reheating can occur. Unlike the natural inflation based on Einstein gravity, the tensor-to-scalar ratio is well below the current bound set by Planck. In both realizations mentioned above, the basic inflationary formulae are computed analytically and, therefore, these possibilities can be used as simple benchmark models.---

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Graviton self-energy from gravitons in cosmology*

Tan

Tsamis

Woodard

2021

Class. Quantum Grav.

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Although matter contributions to the graviton self-energy must be separately conserved on x μ and x′ μ , graviton contributions obey the weaker constraint of the Ward identity, which involves a divergence on both coordinates. On a general homogeneous and isotropic background this leads to just four structure functions for matter contributions but nine structure functions for graviton contributions. We propose a convenient parameterization for these nine structure functions. We also apply the formalism to explicit one loop computations of on de Sitter background, one of the contributions from a massless, minimally coupled scalar and the other for the contribution from gravitons in the simplest gauge. We also specialize the linearized, quantum-corrected Einstein equation to the graviton mode function and to the gravitational response to a point mass.

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One loop corrected conformally coupled scalar mode equations during inflation

Cited by 7 publications

References 83 publications

One loop graviton corrections to dynamical photons in de Sitter

One loop graviton corrections to dynamical photons in de Sitter

Quasi-conformal models and the early universe

Graviton self-energy from gravitons in cosmology*

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