352 citations · 819 across the 15 of their papers we have counts for
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Non-Gaussianity in three fluid curvaton model
Tuomas Multamaki, Jani Sainio, Iiro Vilja
The generation of non-gaussianity is studied in a three fluid curvaton model. By utilizing second order perturbation theory we derive general formulae for the large scale temperatu…
Large tensor-to-scalar ratio and low scale inflation
Rouzbeh Allahverdi, Anupam Mazumdar, Tuomas Multamaki
It is plausible that the scalar density perturbations are created by a relatively low scale model of inflation which predicts the CMB anisotropy and excites Standard Model baryon a…
On using the CMB shift parameter in tests of models of dark energy
Oystein Elgaroy, Tuomas Multamaki
The so-called shift parameter is related to the position of the first acoustic peak in the power spectrum anisotropies of the cosmic microwave background (CMB) anisotropies. It is…
Suppression of the large scale curvature perturbation by interacting fluids
T. Multamaki, J. Sainio, I. Vilja
The large-scale dynamics of a two-fluid system with a time dependent interaction is studied analytically and numerically. We show how a rapid transition can significantly suppress…
Spherically symmetric solutions of modified field equations in f(R) theories of gravity
Tuomas Multamaki, Iiro Vilja
Spherically symmetric static empty space solutions are studied in f(R) theories of gravity. We reduce the set of modified Einstein's equations to a single equation and show how one…
Complex supergravity quintessence models confronted with Sn Ia data
K. Henttunen, T. Multamaki, I. Vilja
A class of supergravity inspired quintessence models is studied by comparing to cosmological data. The set of considered models includes several previously studied quintessential p…