Interferometer constraints on the inflationary field content

Iacconi, Laura; Fasiello, Matteo; Assadullahi, Hooshyar; Dimastrogiovanni, Emanuela; Wands, David

doi:10.1088/1475-7516/2020/03/031

Cited by 30 publications

(41 citation statements)

References 63 publications

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“…The recent CMB data by Planck [14][15][16] either rules out or applies tight constraints to most conventional models. Moreover, the swampland conjectures in string theory have put additional restrictions on these scalar field models [17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Inflation with an antisymmetric tensor field

et al. 2018

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We investigate the possibility of inflation with models of antisymmetric tensor field having minimal and nonminimal couplings to gravity. Although the minimal model does not support inflation, the nonminimal models, through the introduction of a nonminimal coupling to gravity, can give rise to stable de-Sitter solutions with a bound on the coupling parameters. The values of field and coupling parameters are sub-planckian. Slow roll analysis is performed and slow-roll parameters are defined which can give the required number of e-folds for sufficient inflation. Stability analysis has been performed for perturbations to antisymmetric field while keeping the metric unperturbed, and it is found that only the sub-horizon modes are free of ghost instability for de-Sitter space.

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Section: Introductionmentioning

confidence: 99%

Inflation with an antisymmetric tensor field

et al. 2018

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“…Points (i)-(iii) are discussed and summarised in Secs. 3.1, 3.2 and 3.3 of [32]. Point (iv) is discussed e.g.…”

Section: Parameter Spacementioning

confidence: 96%

“…(2.6). The full scalar and tensor power spectra of the model under scrutiny are given by (see also [31,32])…”

Section: The γγγ and γγζ Bispectramentioning

confidence: 99%

“…9 for a set of parameters that maximises the GW amplitudes at direct detection scales. Note that c 0 has been chosen as large as possible (close to 1) throughout its scale dependence due to the constraint g/H c 2 0 imposed to avoid gradient instabilities [32]. This allows us to take larger values of g/H, leading to an observable GW spectrum on small scales (the sourced contribution to the tensor power spectrum scales as (g/H) 2 , Eq.…”

Section: Parameter Spacementioning

confidence: 99%

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Testing the Early Universe with Anisotropies of the Gravitational Wave Background

Dimastrogiovanni,

Fasiello,

Malhotra

et al. 2021

Preprint

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In this work we analyse in detail the possibility of using small and intermediatescale gravitational wave anisotropies to constrain the inflationary particle content. First, we develop a phenomenological approach focusing on anisotropies generated by primordial tensor-tensor-scalar and purely gravitational non-Gaussianities. We highlight the quantities that play a key role in determining the detectability of the signal. To amplify the power of anisotropies as a probe of early universe physics, we consider cross-correlations with CMB temperature anisotropies. We assess the size of the signal from inflationary interactions against so-called induced anisotropies. In order to arrive at realistic estimates, we obtain the projected constraints on the non-linear primordial parameter F NL for several upcoming gravitational wave probes in the presence of the astrophysical gravitational wave background. We further illustrate our findings by considering a concrete inflationary realisation and use it to underscore a few subtleties in the phenomenological analysis.

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“…The former could leave a signature in LSS next-generation experiments, giving a specific imprint 22 on the distribution of galaxies [33,48,49], while the latter could play a crucial role in the generation of anisotropies of the gravitational waves background [36,37,50,51].…”

Section: Perturbationsmentioning

confidence: 99%

Primordial non-Gaussianity in supersolid inflation

Celoria

Comelli

Pilo

et al. 2021

J. High Energ. Phys.

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We study primordial non-gaussianity in supersolid inflation. The dynamics of supersolid is formulated in terms of an effective field theory based on four scalar fields with a shift symmetric action minimally coupled with gravity. In the scalar sector, there are two phonon-like excitations with a kinetic mixing stemming from the completely spontaneous breaking of diffeomorphism. In a squeezed configuration, fNL of scalar perturbations is angle dependent and not proportional to slow-roll parameters showing a blunt violation of the Maldacena consistency relation. Contrary to solid inflation, the violation persists even after an angular average and generically the amount of non-gaussianity is significant. During inflation, non-gaussianity in the TSS and TTS sector is enhanced in the same region of the parameters space where the secondary production of gravitational waves is sizeable enough to enter in the sensitivity region of LISA, while the scalar fNL is still within the current experimental limits.

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Interferometer constraints on the inflationary field content

Cited by 30 publications

References 63 publications

Inflation with an antisymmetric tensor field

Inflation with an antisymmetric tensor field

Testing the Early Universe with Anisotropies of the Gravitational Wave Background

Primordial non-Gaussianity in supersolid inflation

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