Non-unitary evolution in the general extended EFT of inflation &amp; excited initial states

Ashoorioon, Amjad

doi:10.1007/jhep12(2018)012

Cited by 16 publications

(26 citation statements)

References 30 publications

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“…With such thoughts, an extension of the EFT of inflation by adding high dimension operators has also been constructed and the corresponding primordial perturbation spectra have also been explored in refs. [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Inflationary perturbation spectra at next-to-leading slow-roll order in effective field theory of inflation

Ding

Qiao

et al. 2019

Eur. Phys. J. C

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The effective field theory (EFT) of inflation provides an essential picture to explore the effects of the unknown high energy physics in the single scalar field inflation models. For a generic EFT of inflation, possible high energy corrections to simple slow-roll inflation can modify both the propagating speed and dispersion relations of the cosmological scalar and tensor perturbations. With the arrival of the era of precision cosmology, it is expected that these high energy corrections become more important and have to be taken into account in the analysis with future precise observational data. In this paper we study the observational predictions of the EFT of inflation by using the third-order uniform asymptotic approximation method. We calculate explicitly the primordial power spectra, spectral indices, running of the spectral indices for both scalar and tensor perturbations, and the ratio between tensor and scalar spectra. These expressions are all written in terms of the Hubble flow parameters and the flow of four new slow-roll parameters and expanded up to the next-to-leading order in the slow-roll expansions so they represent the most accurate results obtained so far in the literature. The flow of the four new slow-roll parameters, which arise from the four new operators introduced in the action of the EFT of inflation, can affect the primordial perturbation spectra at the leading-order and the corresponding spectral indices at the next-to-leading order. *

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Section: Introductionmentioning

confidence: 99%

Inflationary perturbation spectra at next-to-leading slow-roll order in effective field theory of inflation

Ding

Qiao

et al. 2019

Eur. Phys. J. C

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“…In Hořava-Lifshitz theory of quantum gravity, such excited states can be produced by the contribution of high-order spatial derivative terms in the action of the theory, which also supply a nonlinear dispersion relation for the inflationary perturbations [53][54][55]. We note that such nonlinear dispersion relation can also arise from high-order extension of the effective field theory of inflation [56][57][58][59][60] and phenomenological consideration of achieving a nearly scale-invariant power spectrum [61], for examples.…”

Section: Arxiv:191205145v1 [Gr-qc] 11 Dec 2019mentioning

confidence: 94%

Inflationary Cosmology with Quantum Gravitational Effects and Swampland Conjectures*

Wu¹,

Zhu²

2019

Commun. Theor. Phys.

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Recently proposed two swampland criteria that arising from string theory landscape lead to the important challenge of the realization of single-field inflationary models. Especially one of swampland criteria which implies a large tensor-to-scalar ratio is strongly in tension with recent observational results. In this paper, we explore the possibility if the swampland conjectures could be compatible with single-field inflationary scenarios if the effects due to the quantum theory of gravity are considered. We show that the quantum gravitational effects due to the nonlinear dispersion relation provides significant modifications on the amplitude of both the scalar and tensor perturbation spectra. Such modifications could be either raise or reduce the perturbation spectra depending on the values of the parameters in the nonlinear terms of the dispersion relations. Therefore, these effects can reduce the tensor-to-scalar ratio to a smaller value which helps to relax the tension between the swampland conjecture and observational data.

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“…19 See [22] for an extension of the single clock formalism to multifield models of inflation. There have also been more recent extensions of this EFT [48,49]. Also see [50] for a different EFT formalism for inflation.…”

Section: Overviewmentioning

confidence: 98%

Constraining violations of the weak equivalence principle in the dark sector

Bahrami

2019

J. Cosmol. Astropart. Phys.

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The effective field theory of dark energy is generalized to incorporate dark matter, which is modelled using a complex scalar field with a global U (1) symmetry. The dark matter model used here has similarities to models of ultralight axion. Generic interaction terms in the dark matter sector violate the weak equivalence principle. The degree to which such violations can occur is constrained using a number of recent analyses and forecasts in cosmology. arXiv:1810.05182v2 [gr-qc] 31 May 2019 7 Acknowledgments 35 A Some background geometric tensors 36 B The stress energy tensor for imperfect relativistic fluids 36 B.1 Stress energy tensors in comoving frames 37 C The effective field theory dark matter operators 40 C.1 Second order operators in the dark matter sector 41 C.2 First order operators in the dark matter sector 41 7 Acknowledgments We thank Mariana Carrillo Gonzalez, Éanna Flanagan, Maxim Perelstein, Mark Trodden, and Yu-dai Tsai for helpful discussions. We especially thank Éanna Flanagan for very valuable

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Non-unitary evolution in the general extended EFT of inflation & excited initial states

Cited by 16 publications

References 30 publications

Inflationary perturbation spectra at next-to-leading slow-roll order in effective field theory of inflation

Inflationary perturbation spectra at next-to-leading slow-roll order in effective field theory of inflation

Inflationary Cosmology with Quantum Gravitational Effects and Swampland Conjectures*

Constraining violations of the weak equivalence principle in the dark sector

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