Inflation in a two 3-form fields scenario - K. Sravan Kumar et al JCAP06(2014)064 doi:10.1088/1475-7516/2014/06/064

Inflation in a two 3-form fields scenario - Abstract - Journal of Cosmology and Astroparticle Physics - IOPscience:

"Journal of Cosmology and Astroparticle Physics Volume 2014 June 2014

K. Sravan Kumar et al JCAP06(2014)064
 doi:10.1088/1475-7516/2014/06/064

 Inflation in a two 3-form fields scenario

K. Sravan Kumara, b,
J. Marto a,b,
Nelson J. Nunes c
and
P. Vargas Moniz a,b
Show affiliations

 Abstract A setting constituted by 3-form fields, without any direct interaction between them, minimally coupled to gravity, is introduced in this paper as a framework to study the early evolution of the universe. We focus particularly on the two 3-forms case. An inflationary scenario is found, emerging from the coupling to gravity. More concretely, the fields coupled in this manner exhibit a complex interaction, mediated by the time derivative of the Hubble parameter. Our investigation is supported by means of a suitable choice of potentials, employing numerical methods and analytical approximations. In more detail, the oscillations on the small field limit become correlated, and one field is intertwined with the other. In this type of solution, a varying sound speed is present, together with the generation of isocurvature perturbations. The mentioned features allow to consider an interesting model, to test against observation. It is subsequently shown how our results are consistent with current CMB data (viz.Planck and BICEP2).

 Keywords inflation cosmological parameters from CMBR   E-print Number: 1404.0211 Cited: by | Refers: to PACS 98.80.Cq Particle-theory and field-theory models of the early Universe (including cosmic pancakes, cosmic strings, chaotic phenomena, inflationary universe, etc.) 04.50.-h Higher-dimensional gravity and other theories of gravity 98.70.Vc Background radiations Subjects Gravitation and cosmology Astrophysics and astroparticles

Dates

 Issue 06 (June 2014) Received 11 April 2014, accepted for publication 30 May 2014 Published 30 June 2014"

'via Blog this' The Honourable Schoolboy