Breaking discrete symmetries in the effective field theory of inflation

Cannone, Dario; Gong, Jinn Ouk; Tasinato, Gianmassimo

doi:10.1088/1475-7516/2015/08/003

Cited by 54 publications

(47 citation statements)

References 90 publications

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“…where we have defined the slow-roll parameters as 8) with no summation for the repeated i indices. In the following computation, we focus on the production of δσ from the gauge field δA and its subsequent sourcing of δφ, namely the process δA + δA → δσ → δφ.…”

Section: Amplification Of the Fluctuations Of The Gauge Fieldmentioning

confidence: 99%

Scale-dependent gravitational waves from a rolling axion

Namba

Peloso

Shiraishi

et al. 2016

J. Cosmol. Astropart. Phys.

189

372

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Abstract. We consider a model in which a pseudo-scalar field σ rolls for some e-folds during inflation, sourcing one helicity of a gauge field. These fields are only gravitationally coupled to the inflaton, and therefore produce scalar and tensor primordial perturbations only through gravitational interactions. These sourced signals are localized on modes that exit the horizon while the roll of σ is significant. We focus our study on cases in which the model can simultaneously produce (i) a large gravitational wave signal, resulting in observable B-modes of the CMB polarizations, and (ii) sufficiently small scalar perturbations, so to be in agreement with the current limits from temperature anisotropies. Different choice of parameters can instead lead to a localized and visible departure from gaussianity in the scalar sector, either at CMB or LSS scales.arXiv:1509.07521v1 [astro-ph.CO]

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Section: Amplification Of the Fluctuations Of The Gauge Fieldmentioning

confidence: 99%

Scale-dependent gravitational waves from a rolling axion

Namba

Peloso

Shiraishi

et al. 2016

J. Cosmol. Astropart. Phys.

189

372

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“…where g s1 , f s1 , f s2 and g s2 defined as in (54), (55), (58) and (59) respectively. As a specific example, we take the following set of parameters…”

Section: Enhancement Of Spectra Of Fluctuations During the Non-attracmentioning

confidence: 99%

“…Ways to do so are scenarios of (super)solid inflation -see e.g. [52][53][54][55][56][57][58][59][60][61] -or massive gravity/bigravity models, [62][63][64][65]. See e.g.…”

Section: Introductionmentioning

confidence: 99%

A new mechanism to enhance primordial tensor fluctuations in single field inflation

Mylova

Özsoy

Parameswaran

et al. 2018

J. Cosmol. Astropart. Phys.

Self Cite

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We discuss a new mechanism to enhance the spectrum of primordial tensor fluctuations in single field inflationary scenarios. The enhancement relies on a transitory non-attractor inflationary phase, which amplifies the would-be decaying tensor mode, and gives rise to a growth of tensor fluctuations at superhorizon scales. We show that the enhancement produced during this phase can be neatly treated via a tensor duality between an attractor and non-attractor phase, which we introduce. We illustrate the mechanism and duality in a kinetically driven scenario of inflation, with non-minimal couplings between the scalar and the metric.

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“…We can also incorporate the parity violation in anisotropic inflation [17]. These are complementary to the effective field theory approach [18].…”

Section: Discussionmentioning

confidence: 99%

Designing anisotropic inflation with form fields

Ito

Soda

2015

Phys. Rev. D

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We study inflation with anisotropic hair induced by form fields. In four dimensions, the relevant form fields are gauge (one-form) fields and two-form fields. Assuming the exponential form of potential and gauge kinetic functions, we find new exact power-law solutions endowed with anisotropic hair. We also explore the phase space of anisotropic inflation and find fixed points corresponding to the exact power-law solutions. Moreover, we perform the stability analysis around the fixed points to reveal the structure of the phase space. It turns out that one of the fixed points becomes an attractor and others (if any) are saddle points. In particular, the one corresponding to anisotropic inflation becomes an attractor when it exists. We also argue that various anisotropic inflation models can be designed by choosing coupling constants.

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Breaking discrete symmetries in the effective field theory of inflation

Cited by 54 publications

References 90 publications

Scale-dependent gravitational waves from a rolling axion

Scale-dependent gravitational waves from a rolling axion

A new mechanism to enhance primordial tensor fluctuations in single field inflation

Designing anisotropic inflation with form fields

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