Anisotropic inflation with coupled p−forms

Almeida, Juan P. Beltrán; Guarnizo, Alejandro; Kase, Ryotaro; Tsujikawa, Shinji; Valenzuela-Toledo, César A.

doi:10.1088/1475-7516/2019/03/025

Anisotropic inflation with coupled p−forms

Juan P. Beltrán Almeida
(
- Antonio Narino U.
)
,
Alejandro Guarnizo
(
- Antonio Narino U. and
- Valle U., Cali
)
,
Ryotaro Kase
(
- Tokyo U. of Sci.
)
,
Shinji Tsujikawa
(
- Tokyo U. of Sci.
)
,
César A. Valenzuela-Toledo
(
- Valle U., Cali
)

Jan 18, 2019

23 pages

Published in:

JCAP 03 (2019) 025

Published: Mar 13, 2019

e-Print:

1901.06097 [gr-qc]

DOI:

10.1088/1475-7516/2019/03/025 (publication)

View in:

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Abstract: (IOP)

We study the cosmology in the presence of arbitrary couplings between p-forms in 4-dimensional space-time for a general action respecting gauge symmetry and parity invariance. The interaction between 0-form (scalar field ) and 3-form fields gives rise to an effective potential Veff() for the former after integrating out the contribution of the latter. We explore the dynamics of inflation on an anisotropic cosmological background for a coupled system of 0-, 1-, and 2-forms. In the absence of interactions between 1- and 2-forms, we derive conditions under which the anisotropic shear endowed with nearly constant energy densities of 1- and 2-forms survives during slow-roll inflation for an arbitrary scalar potential Veff(). If 1- and 2-forms are coupled to each other, we show the existence of a new class of anisotropic inflationary solutions in which the energy density of 2-form is sustained by that of 1-form through their interactions. Our general analytic formulas for the anisotropic shear are also confirmed by the numerical analysis for a concrete inflaton potential.

Note:

23 pages, 4 figures, version to be published in JCAP

energy: density
inflation: anisotropy
inflation: slow-roll approximation
potential: scalar
field theory: scalar
inflaton: potential
parity: invariance
symmetry: gauge
effective potential
cosmological model

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