Large scale suppression of scalar power on a spatial condensation

Kouwn, Seyen; Kwon, O-Kab; Oh, Phillial

doi:10.1103/physrevd.91.063521

Cited by 11 publications

(21 citation statements)

References 54 publications

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“…Several other gravitational phenomena associated with broken spatial diffeomorphisms have also been discussed in the literature [48][49][50][51][52][53][54][55][56], without relating them explicitly to the massive gravity aspect of the theory. For example, by tuning the form of higher order interactions, ref.…”

Section: Jhep03(2016)128mentioning

confidence: 99%

Effective field theory of broken spatial diffeomorphisms

Lin

Labun

2016

J. High Energ. Phys.

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We study the low energy effective theory describing gravity with broken spatial diffeomorphism invariance. In the unitary gauge, the Goldstone bosons associated with broken diffeomorphisms are eaten and the graviton becomes a massive spin-2 particle with 5 well-behaved degrees of freedom. In this gauge, the most general theory is built with the lowest dimension operators invariant under only temporal diffeomorphisms. Imposing the additional shift and SO(3) internal symmetries, we analyze the perturbations on a FRW background. At linear perturbation level, the observables of this theory are characterized by five parameters, including the usual cosmological parameters and one additional coupling constant for the symmetry-breaking scalars. In the de Sitter and Minkowski limit, the three Goldstone bosons are supermassive and can be integrated out, leaving two massive tensor modes as the only propagating degrees of freedom. We discuss several examples relevant to theories of massive gravity.

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Section: Jhep03(2016)128mentioning

confidence: 99%

Effective field theory of broken spatial diffeomorphisms

Lin

Labun

2016

J. High Energ. Phys.

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“…where V φ ≡ dV /dφ. To preserve the cosmological principles of homogeneity and isotropy for this model in the flat FLRW background with metric, ds 2 = −dt 2 + a(t) 2 (dx 2 + dy 2 + dz 2 ), we choose a spatially linear background solution for σ a [21,22,[25][26][27][28]35] ,…”

Section: Gravitational Waves Induced By the Space-condensate Inflatiomentioning

confidence: 99%

Primordial gravitational waves from the space-condensate inflation model

2016

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We consider the space-condensate inflation model to study the primordial gravitational waves generated in the early Universe. We calculate the energy spectrum of gravitational waves induced by the space-condensate inflation model for the full frequency range with the assumption that the phase transition between two consecutive regimes is abrupt during the evolution of the Universe. The suppression of the energy spectrum is found in our model for the decreasing frequency of gravitational waves depending on the model parameter. To realize the suppression of the energy spectrum of the primordial gravitational waves, we study the existence of the early phase transition during inflation for the space-condensate inflation model.

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“…[21] for a review), where correlation functions of perturbations show statistically anisotropic features [22][23][24][25][26][27][28][29][30][31][32][33]. Cosmological perturbations in solid inflation and its variations have also been widely studied [34][35][36][37][38][39][40][41][42][43][44][45][46][47]. In our model, the number of spacelike scalar fields is not fixed to three, which is required in the solid inflation.…”

Section: Introductionmentioning

confidence: 98%

Primordial gravitational waves and perturbations during an inhomogeneous inflation

Gao

Kang

2018

J. Cosmol. Astropart. Phys.

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We investigate the inhomogeneous inflation, in which the space exponentially expands with inhomogeneities, and its cosmological perturbations. The inhomogeneous inflation is realized by introducing scalar fields with spacelike gradients that break the spatial symmetry. We find that the space can expand uniformly in different direction with the same rate. By using the perturbative method, we calculate the corrections to the power spectra of gravitational waves and curvature perturbation up to the linear order in the background inhomogeneities. Since the background is inhomogeneous, perturbations modes with different wave numbers get correlated. We show that generally the power spectra of perturbations depend on the ratio and the angle of wave numbers of the two correlated modes. In particular, the two circular polarization modes of the gravitational waves gain different powers when the background inhomogeneity is of vector or tensor type.

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Large scale suppression of scalar power on a spatial condensation

Cited by 11 publications

References 54 publications

Effective field theory of broken spatial diffeomorphisms

Effective field theory of broken spatial diffeomorphisms

Primordial gravitational waves from the space-condensate inflation model

Primordial gravitational waves and perturbations during an inhomogeneous inflation

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