Kari Enqvist

Adiabatic CMB perturbations in pre-Big-Bang string cosmology

Abstract 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 Δn in the range −0.1≲ Δn ≲1.

Gauge-invariant inflaton in the minimal supersymmetric standard model

We argue that all the necessary ingredients for successful inflation are present in the flat directions of the Minimally Supersymmetric Standard Model. We show that out of many gauge invariant combinations of squarks, sleptons and Higgses, there are two directions,

Cosmological consequences of MSSM flat directions

{\bf LLe}

B-ball baryogenesis and the baryon to dark matter ratio

, and

Searching for a holographic connection between dark energy and the low l CMB multipoles

{\bf udd}

Stringent cosmological bounds on inert neutrino mixing

, which are promising candidates for the inflaton. The model predicts more than

Lemaitre–Tolman–Bondi model and accelerating expansion

10^3

Possible connection between the location of the cutoff in the cosmic microwave background spectrum and the equation of state of dark energy

e-foldings with an inflationary scale of

Non-Gaussianity from preheating

H_{\rm inf}\sim {\cal O}(1-10)

Non-Gaussianity in curvaton models with nearly quadratic potentials

GeV, provides a tilted spectrum with an amplitude of