# Anisotropic power-law inflation

@article{Kanno2010AnisotropicPI, title={Anisotropic power-law inflation}, author={Sugumi Kanno and J. Soda and Masa-aki Watanabe}, journal={Journal of Cosmology and Astroparticle Physics}, year={2010}, volume={2010}, pages={024-024} }

We study an inflationary scenario in supergravity model with a gauge kinetic function. We find exact anisotropic power-law inflationary solutions when both the potential function for an inflaton and the gauge kinetic function are exponential type. The dynamical system analysis tells us that the anisotropic power-law inflation is an attractor for a large parameter region.

## 147 Citations

### ANISOTROPIC POWER-LAW INFLATION FROM ROLLING TACHYONS

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- 2012

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We study anisotropic inflation with Gauss-Bonnet correction in presence of a massless vector field. In this scenario, exact anisotropic power-law inflation is realized when the inflaton potential,…

### Anisotropic inflation with non-abelian gauge kinetic function

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- 2011

We study an anisotropic inflation model with a gauge kinetic function for a non-abelian gauge field. We find that, in contrast to abelian models, the anisotropy can be either a prolate or an oblate…

### Anisotropic inflation with the nonvacuum initial state

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In this work we study models of anisotropic inflation with the generalized non-vacuum initial states for the inflaton field and the gauge field. The effects of non Bunch-Davies initial condition on…

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We develop an effective-field-theory (EFT) framework for inflation with various symmetry breaking pattern. As a prototype, we formulate anisotropic inflation from the perspective of EFT and construct…

### Anisotropic Power-law Inflation:A counter example to the cosmic no-hair conjecture

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It is widely believed that anisotropy in the expansion of the universe will decay exponentially fast during inflation. This is often referred to as the cosmic no-hair conjecture. However, we find a…

### Anisotropic power-law inflation for a model of two scalar and two vector fields

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- Physics
- 2012

We provide an explicit solution representing an anisotropic power-law inflation within the framework of rolling tachyon model. This is generated by allowing a non-minimal coupling between the tachyon…

### Anisotropic power-law inflation for a two scalar fields model

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A special class of Bianchi type I expanding solutions in a string motivated theory with a single scalar field has been speculated to break the cosmic no-hair theorem that will not approach the late…

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A universal relation between the anisotropy and a slow-roll parameter of inflation is found and has observational implications and gives a counterexample to the cosmic no-hair conjecture.

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- Physics
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We review an inflationary scenario with the anisotropic expansion rate. An anisotropic inflationary universe can be realized by a vector field coupled with an inflaton, which can be regarded as a…

### Anisotropic inflation with non-abelian gauge kinetic function

- Physics
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We study an anisotropic inflation model with a gauge kinetic function for a non-abelian gauge field. We find that, in contrast to abelian models, the anisotropy can be either a prolate or an oblate…

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We study an inflationary scenario with a vector impurity. We show that the universe undergoes anisotropic inflationary expansion due to a preferred direction determined by the vector. Using the slow…

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We find a new set of the Bianchi type I power-law expanding solutions in a string-motivated DiracBorn-Infeld theory. Stability analysis shows that these power-law inflationary solutions remain stable…