An inflationary scenario taking into account of possible dark energy effects in the early universe

Zhe Chang; Ming-Hua Li; Xin Li; Sai Wang

doi:10.1140/epjc/s10052-012-1915-3

EPJ

An inflationary scenario taking into account of possible dark energy effects in the early universe

Zhe Chang¹, Ming-Hua Li¹^*, Xin Li² and Sai Wang²

¹ Institute of High Energy Physics, Chinese Academy of Sciences, 100049, Beijing, China
² Theoretical Physics Center for Science Facilities, Chinese Academy of Sciences, 100049, Beijing, China

Received: 17 October 2011
Revised: 6 January 2012
Published online: 2 March 2012

Abstract

We investigate the possible effect of cosmological-constant type dark energy during the inflation period of the early universe. This is accommodated by a new dispersion relation in de Sitter space. The modified inflation model of a minimally coupled scalar field is still able to yield an observation-compatible scale-invariant primordial spectrum, simultaneously having the potential to generate a spectrum with lower power at large scales. A qualitative match to the WMAP 7-year data is presented. We obtain an Ω _Λ of the same order of that in the Λ-CDM model. Possible relations between the de Sitter scenario and Doubly Special Relativity (DSR) are also discussed.