200 citations · 1.8k across the 55 of their papers we have counts for
6 papers · 1 filter
Curvaton scenario with low scale inflation revisited
Marieke Postma
In its simplest form the curvaton paradigm requires the Hubble parameter during inflation to be bigger than $10^8 \GeV$, but this bound may be evaded in non-standard settings. In t…
Inhomogeneous reheating scenario with low scale inflation and/or MSSM flat directions
Marieke Postma
We discuss the constraints on the inhomogeneous reheating scenario. In particular, we discuss the prospects for low scale inflation with a Hubble constant of the order of the gravi…
Evolution of primordial perturbations and a fluctuating decay rate
Anupam Mazumdar, Marieke Postma
We present a gauge invariant formalism to study the evolution of curvature perturbations during decay of the inflaton or some other field that dominates the energy density. We spec…
Constraining the curvaton scenario
Marieke Postma
We analyse the curvaton scenario in the context of supersymmetry. Supersymmetric theories contain many scalars, and therefore many curvaton candidates. To obtain a scale invariant…
Challenges in generating density perturbations from a fluctuating inflaton coupling
Kari Enqvist, Anupam Mazumdar, Marieke Postma
We discuss the possibility of generating adiabatic density perturbations from spatial fluctuations in the inflaton decay rate which are due to quantum fluctuations of light moduli…
"Signature" neutrinos from photon sources at high redshift
Marieke Postma
The temperature of the cosmic microwave background increases with redshift; at sufficiently high redshift it becomes possible for ultrahigh-energy photons and electrons to produce…