# 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.

## Figures from this paper

## 115 Citations

ANISOTROPIC POWER-LAW INFLATION FROM ROLLING TACHYONS

- 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 constant-roll Inflation

- Geology
- 2017

We study constant-roll inflation in the presence of a gauge field coupled to an inflaton. By imposing the constant anisotropy condition, we find new exact anisotropic constant-roll inflationary…

Statistical anisotropy from anisotropic inflation

- Physics
- 2012

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 in Gauss-Bonnet gravity

- Physics
- 2016

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

- Physics
- 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

- Physics
- 2014

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…

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

- Physics
- 2015

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 constant-roll inflation for the Dirac–Born–Infeld model

- PhysicsThe European Physical Journal C
- 2021

In this paper, we study a non-canonical extension of a supergravity-motivated model acting as a vivid counterexample to the cosmic no-hair conjecture due to its unusual coupling between scalar and…

Anisotropic power-law inflation in a two-scalar-field model with a mixed kinetic term

- Physics, Mathematics
- 2017

We examine whether an extended scenario of a two-scalar-field model, in which a mixed kinetic term of canonical and phantom scalar fields is involved, admits the Bianchi type I metric, which is…

Anisotropic Inflation from Charged Scalar Fields

- Physics
- 2010

We consider models of inflation with U(1) gauge fields and charged scalar fields including symmetry breaking potential, chaotic inflation and hybrid inflation. We show that there exist attractor…

## References

SHOWING 1-10 OF 123 REFERENCES

ANISOTROPIC POWER-LAW INFLATION FROM ROLLING TACHYONS

- 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

- Physics
- 2011

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…

Inflationary universe with anisotropic hair.

- PhysicsPhysical review letters
- 2009

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.

Statistical anisotropy from anisotropic inflation

- Physics
- 2012

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
- 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…

Cosmological 'seed' magnetic field from inflation

- Physics
- 1991

We extend the canonical exponential potential scalar field inflation modified hot big bang model by adding an inflation epoch coupling, between the scalar field Φ responsible for inflation and an…

Anisotropic Inflation from Vector Impurity

- Physics
- 2008

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…

Anisotropic power-law inflation for the Dirac-Born-Infeld theory

- Physics
- 2011

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…