Kasner Asymptotics of Weakly and Strongly Coupled Heterotic String Cosmologies

Details Kasner Asymptotics of Weakly and Strongly Coupled Heterotic String Cosmologies Kasner Asymptotics of Weakly and Strongly Coupled Heterotic String Cosmologies

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002nmgm.meet..902d&link_type=abstract

"THE NINTH MARCEL GROSSMANN MEETING On Recent Developments in Theoretical and Experimental General Relativity, Gravitation and R

Physics

Scientific paper

String theory is the best candidate for unification of gauge interactions with gravity. There are various string effective theories (bosonic, type I, type IIA, type IIB and heterotic E8 × E8 or SO(32)) which can be represented by some effective actions with suitable field equations. In these theories lots of different stringy modes appear, but they have a common bosonic sector which after a suitable dimensional reduction can be represented by a 4-dimensional effective action S = (1)/({2λ s2 )} ∫ {d4 x√ { - g4 } e{ - φ } } { {R + (∇ φ )2 - (1)/({12)}H2 } ; \}, (1) where ɸ is the dilaton, g4 the determinant of the 4-dimensional metric, R the 4-dimensional Ricci scalar, Hμνρ = ∂[μBνρ] (dH = 0) the NS-NS axion with H2 = HμνρHμνρ and Bμν the antisymmetric tensor potential, Bμν = -Bμν. The dilaton, the axion and the graviton are the massless ('stringy') modes of the theory. In particular, the action (1) is the weak coupling limit (string coupling constant gs = exp (ɸ/2) → 0) action of the heterotic E8 × E8 string theory ...

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