Chiral gravity waves and leptogenesis in inflationary models with non-Abelian gauge fields

Maleknejad, Azadeh

doi:10.1103/physrevd.90.023542

Cited by 55 publications

(74 citation statements)

References 47 publications

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“…It is also appealing since all matter fields are coupled to the gravitational sector and one may expect P-odd effects due to the imbalance caused by a neutrino background appearing in some cosmological models, see e.g. [20][21][22][23].…”

Section: Jhep02(2018)099mentioning

confidence: 99%

Chiral anomalous dispersion

Sadofyev

Sen

2018

J. High Energ. Phys.

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Abstract:The linearized Einstein equation describing graviton propagation through a chiral medium appears to be helicity dependent. We analyze features of the corresponding spectrum in a collision-less regime above a flat background. In the long wave-length limit, circularly polarized metric perturbations travel with a helicity dependent group velocity that can turn negative giving rise to a new type of an anomalous dispersion. We further show that this chiral anomalous dispersion is a general feature of polarized modes propagating through chiral plasmas extending our result to the electromagnetic sector.

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Section: Jhep02(2018)099mentioning

confidence: 99%

Chiral anomalous dispersion

Sadofyev

Sen

2018

J. High Energ. Phys.

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“…In this work we considered a model of inflation containing three complex scalar fields charged under U (1) a gauge symmetry with gauge coupling e. The corresponding gauge fields A (a) µ enjoy an internal O(3) symmetry associated with the rotation in field space. In a sense this model is a hybrid of models of anisotropic inflation and models based on non-Abelian gauge fields [31,32,33,34,35,36,37]. Similar to anisotropic inflation models, with appropriate coupling of the gauge fields to the inflaton field, the system reaches an attractor phase in which the energy density of the gauge fields reaches a constant fraction of the total energy density and the gauge field perturbations become scale invariant.…”

Section: Discussionmentioning

confidence: 99%

Charged vector inflation

et al. 2019

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We present a model of inflation in which the inflaton field is charged under a triplet of U (1) gauge fields. The model enjoys an internal O(3) symmetry supporting the isotropic FRW solution. With an appropriate coupling between the gauge fields and the inflaton field, the system reaches an attractor regime in which the gauge fields furnish a small constant fraction of the total energy density. We decompose the scalar perturbations into the adiabatic and entropy modes and calculate the contributions of the gauge fields into the curvature perturbations power spectrum. We also calculate the entropy power spectrum and the adiabatic-entropy cross correlation. In addition to the metric tensor perturbations, there are tensor perturbations associated with the gauge field perturbations which are coupled to metric tensor perturbations. We show that the correction in primordial gravitational tensor power spectrum induced from the matter tensor perturbation is a sensitive function of the gauge coupling. * firouz@ipm.ir † gorji@ipm.ir ‡ shosseini@shahroodut.ac.ir § karami@ipm.ir ¶ t.rostami@ipm.ir 1 arXiv:1812.07464v2 [hep-th]

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“…Incidentally, many of the effects that lead to V will also source chiral gravitational waves (e.g. axions [54][55][56][57][58][59][60][61][62][63][64][65][66]), and thus one additionally expects non-vanishing T B, EB, and V B in these models.…”

Section: Cmb-21cm Cross Correlationmentioning

confidence: 99%

Physics beyond the Standard Model with circular polarization in the CMB and CMB-21cm cross-correlation

Alexander

McDonough

Pullen

et al. 2020

J. Cosmol. Astropart. Phys.

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Circular polarization is a relatively unexplored realm of CMB physics. Given the substantial community effort towards building next generation CMB polarization experiments, including those which will be sensitive to circular polarization, it behooves theorists to understand the possible sources and relevant physics of circular polarization, as encoded in the Stokes V parameter. In this work we develop and derive the requisite formalism, namely the Boltzmann hierarchy for V-mode scalar, vector, and tensor, anisotropies. We derive the V-mode anisotropies induced by a general source term, and demonstrate how existing proposals for the generation of V can be incorporated as source terms in the Boltzmann hierarchy. A subset of these effects may be correlated with 21cm intensity; we provide a worked example and derive an estimator to extract this information from observations. We conclude by computing the CMB T V cross-correlation generated by axions, and find a relation between T V and V V spectra in axion models.

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Chiral gravity waves and leptogenesis in inflationary models with non-Abelian gauge fields

Cited by 55 publications

References 47 publications

Chiral anomalous dispersion

Chiral anomalous dispersion

Charged vector inflation

Physics beyond the Standard Model with circular polarization in the CMB and CMB-21cm cross-correlation

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