Adiabatic CMB perturbations in pre-big bang string cosmology

Kari Enqvist, Martin Snoager Sloth

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Resumé

We consider the pre-big bang scenario with a massive axion field which starts to dominate energy density when oscillating in an instanton-induced potential and subsequently reheats the universe as it decays into photons, thus creating adiabatic CMB perturbations. We find that the fluctuations in the axion field can give rise to a nearly flat spectrum of adiabatic perturbations with a spectral tilt $\Delta n$ in the range $-0.1 \lesssim \Delta n \lesssim 1$.
OriginalsprogUdefineret/Ukendt
TidsskriftNuclear Physics B
DOI
StatusUdgivet - 24. sep. 2001

Citer dette

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Adiabatic CMB perturbations in pre-big bang string cosmology. / Enqvist, Kari; Sloth, Martin Snoager.

I: Nuclear Physics B, 24.09.2001.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

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AU - Sloth, Martin Snoager

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AB - We consider the pre-big bang scenario with a massive axion field which starts to dominate energy density when oscillating in an instanton-induced potential and subsequently reheats the universe as it decays into photons, thus creating adiabatic CMB perturbations. We find that the fluctuations in the axion field can give rise to a nearly flat spectrum of adiabatic perturbations with a spectral tilt $\Delta n$ in the range $-0.1 \lesssim \Delta n \lesssim 1$.

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