The inflationary brane-antibrane universe

Clifford P. Burgess, Mahbub Majumdar, Detlef Nolte, Fernando Quevedo, Govindan Rajesh, Ren Jie Zhang

Research output: Contribution to journalArticlepeer-review


We show how the motion through the extra dimensions of a gas of branes and antibranes can, under certain circumstances, produce an era of inflation as seen by observers trapped on a 3-brane, with the inflaton being the inter-brane separation. Although most of our discussion refers to arbitrary p-branes, when we need to be specific we assume that they are D-branes of type-II or type-I string theory. For realistic brane couplings, such as those arising in string theory, the inter-brane potentials are too steep to inflate the universe for acceptably long times. However, for special regions of the parameter space of brane-antibrane positions the brane motion is slow enough for there to be sufficient inflation. Inflation would be more generic in models where the inter-brane interactions are much weaker. The spectrum of primordial density fluctuations predicted has index n slightly less than 1, and an acceptable amplitude, provided that the extra dimensions have linear size l/r ∼ 1012 GeV. Reheating occurs as in hybrid inflation, with the tachyonic instability of the brane-antibrane system taking over for small separations. The tachyon field can induce a cascade mechanism within which higher-dimension branes annihilate into lower-dimension ones. We argue that such a cascade naturally stops with the production of 3-branes in 10-dimensional string theory. KEYWORDS: D-branes, Cosmology of Theories beyond the SM, Physics of the Early Universe.

Original languageEnglish (US)
Pages (from-to)XXLVII-19
JournalJournal of High Energy Physics
Issue number7
StatePublished - 2001

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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