Primordial tensor non-gaussianity from massive gravity

Fujita, Tomohiro; Mizuno, Shuntaro; Mukohyama, Shinji

doi:10.1088/1475-7516/2020/01/023

Cited by 11 publications

(9 citation statements)

References 90 publications

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“…Also, we have shown that the MTMVMG could accommodate the reheating mechanism in this framework, again for both massless and massive sectors. Perturbative approach needs to be applied, for example, to study the behavior of primordial gravitational waves based on MTMVMG, as in the case of four-dimensional MTMG [51,52]. The detailed construction and the phenomenological predictions are left for subsequent works.…”

Section: Discussionmentioning

confidence: 99%

Higher-Dimensional Minimal Theory of Mass-Varying Massive Gravity And Its Cosmological Consequences

Falah,

Latief,

Alatas

et al. 2021

Preprint

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In this paper we construct higher-dimensional minimal theory of mass-varying massive gravity (MTMVMG) where the mass-like scalar potential is coupled to a vielbein potential, unlike in the previous literature where it is coupled to metric, such that the number of graviton degrees of freedom in the theory is the same as in general relativity. We then study the cosmological aspects of this theory and show that it has eight critical points: five in the massless sector and three in the massive sector. In contrast to the standard theory of mass-varying massive gravity where the graviton mass asymptotically approaches zero at late times, hence making the contribution of massive gravity to the late-time cosmic expansion minimum, the MTMVMG can provide good descriptions both in the massless and massive sectors.

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Section: Discussionmentioning

confidence: 99%

Higher-Dimensional Minimal Theory of Mass-Varying Massive Gravity And Its Cosmological Consequences

Falah,

Latief,

Alatas

et al. 2021

Preprint

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“…The specific effect of long tensor fluctuation is to induce, in the presence of non-trivial 4 ultra-squeezed tensor non-Gaussianity, a quadrupolar anisotropy on the power spectrum of the short modes [25][26][27][28][29]. This idea has been explored in the context of inflationary GW at small scales in [30,38,39]. One should also keep in mind that, next to the cosmological SGWB we want to probe, there is an astrophysics SGWB whose signal we need to disentangle from the primordial one.…”

Section: Testing Squeezed Gws Non-gaussianity At Small Scalesmentioning

confidence: 99%

Small-scale tests of inflation

Iacconi¹,

Fasiello²,

Assadullahi³

et al. 2020

J. Cosmol. Astropart. Phys.

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We investigate small-scale signatures of the inflationary particle content. We consider the case of a light spin-2 particle sourcing primordial gravitational waves by employing an effective field theory description. Upon allowing time-dependent sound speeds for the helicity modes, this setup delivers a blue tensor spectrum detectable, for example, by upcoming laser interferometers. Our focus is on the tensor non-Gaussianities that ensue from this field configuration. After characterising the bispectrum amplitude and shape-function at CMB scales, we move on to smaller scales where anisotropies induced in the tensor power spectrum by long-short modes coupling become the key handle on (squeezed) primordial non-Gaussianities. We identify the parameter space generating percent level anisotropies at scales soon to be probed by SKA and LISA.

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“…For example, the normal branch of MTMG may fit the redshift space distortion data better than ΛCDM (De Felice & Mukohyama 2017) without conflicting with the integrated Sachs-Wolfe-galaxy correlation data (Bolis et al 2018). Furthermore, MTMG may provide a simple mechanism to enhance stochastic gravitational waves (Fujita et al 2019(Fujita et al , 2020.…”

Section: Introductionmentioning

confidence: 99%

Non-linear dynamics of the minimal theory of massive gravity

Hagala

Felice

Mota

et al. 2021

A&A

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We investigate cosmological signatures of the minimal theory of massive gravity (MTMG). To this aim, we simulate the normal branch of the MTMG by employing the RAMSESN-body code and extending it with an effective gravitational constant Geff. We implement an environment-dependent Geff as a function of the graviton mass and the local energy density as predicted by MTMG. We find that halo density profiles are not a good probe for MTMG because deviations from general relativity (GR) are quite small. Similarly, the matter power spectra show deviations only at the percentage level. However, we find a clear difference between MTMG and GR in that voids are denser in MTMG than in GR. As measuring void profiles is quite a complex task from an observational point of view, a better probe of MTMG would be the halo abundances. In this case, MTMG creates a larger amount of massive halos, while there is a suppression in the abundance of small halos.

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Primordial tensor non-gaussianity from massive gravity

Cited by 11 publications

References 90 publications

Higher-Dimensional Minimal Theory of Mass-Varying Massive Gravity And Its Cosmological Consequences

Higher-Dimensional Minimal Theory of Mass-Varying Massive Gravity And Its Cosmological Consequences

Small-scale tests of inflation

Non-linear dynamics of the minimal theory of massive gravity

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