Anisotropic inflation from charged scalar fields

Emami, Razieh; Firouzjahi, Hassan; Movahed, M. Sadegh; Zarei, Moslem

doi:10.1088/1475-7516/2011/02/005

Cited by 84 publications

(106 citation statements)

References 71 publications

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“…Ref. [48] supports the higher form through the same mechanism as 3 See [39] for models of anisotropic inflation that employ the idea of [38]. 4 See [40] for an early lagrangian formulation of the cosmological medium as a fluid, and for the description of its perturbations in terms of phonons.…”

Section: Introductionmentioning

confidence: 89%

Anisotropy in solid inflation

Bartolo

Matarrese

Peloso

et al. 2013

J. Cosmol. Astropart. Phys.

106

150

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In the model of solid / elastic inflation, inflation is driven by a source that has the field theoretical description of a solid. To allow for prolonged slow roll inflation, the solid needs to be extremely insensitive to the spatial expansion. We point out that, because of this property, the solid is also rather inefficient in erasing anisotropic deformations of the geometry. This allows for a prolonged inflationary anisotropic solution, providing the first example with standard gravity and scalar fields only which evades the conditions of the so called cosmic no-hair conjecture. We compute the curvature perturbations on the anisotropic solution, and the corresponding phenomenological bound on the anisotropy. Finally, we discuss the analogy between this model and the f (φ) F 2 model, which also allows for anisotropic inflation thanks to a suitable coupling between the inflaton φ and a vector field. We remark that the bispectrum of the curvature perturbations in solid inflation is enhanced in the squeezed limit and presents a nontrivial angular dependence, as had previously been found for the f (φ) F 2 model.

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Section: Introductionmentioning

confidence: 89%

Anisotropy in solid inflation

Bartolo

Matarrese

Peloso

et al. 2013

J. Cosmol. Astropart. Phys.

106

150

View full text Add to dashboard Cite

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“…For instance, Refs. [7,8,9, 10] studied anisotropic inflation with various types of scalar and vector fields, and Refs. [11,12,13,14,15,16,17] discussed relevant perturbation theories.…”

Section: Introductionmentioning

confidence: 99%

Anisotropic inflation with general potentials

Shi

Huang

Qiu

2016

Sci. China Phys. Mech. Astron.

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Anomalies in recent observational data indicate that there might be some "anisotropic hair" generated in an inflation period. To obtain general information about the effects of this anisotropic hair to inflation models, we studied anisotropic inflation models that involve one vector and one scalar using several types of potentials. We determined the general relationship between the degree of anisotropy and the fraction of the vector and scalar fields, and concluded that the anisotropies behave independently of the potentials. We also generalized our study to the case of multi-directional anisotropies.

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“…In fact there are several discussions about the dynamics of inflation, where supportive roles of gauge fields in realizing accelerated expansion have been observed [31][32][33][34][35][36][37][38][39][40][41][42].…”

Section: Introductionmentioning

confidence: 99%

Inflationary dynamics with a non-Abelian gauge field

Maeda

Yamamoto

2013

Phys. Rev. D

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We study the dynamics of the universe with a scalar field and an SU(2) non-Abelian Gauge (Yang-Mills) field. The scalar field has an exponential potential and the Yang-Mills field is coupled to the scalar field with an exponential function of the scalar field. We find that the magnetic component of the Yang-Mills field assists acceleration of the cosmic expansion and a power-law inflation becomes possible even if the scalar field potential is steep, which may be expected from some compactification of higher-dimensional unified theories of fundamental interactions. This power-law inflationary solution is a stable attractor in a certain range of coupling parameters. Unlike the case with multiple Abelian gauge fields, the power-law inflationary solution with the dominant electric component is unstable because of the existence of non-linear coupling of the Yang-Mills field. We also analyze the dynamics for the non-inflationary regime, and find several attractor solutions.

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Anisotropic inflation from charged scalar fields

Cited by 84 publications

References 71 publications

Anisotropy in solid inflation

Anisotropy in solid inflation

Anisotropic inflation with general potentials

Inflationary dynamics with a non-Abelian gauge field

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