11 citations · 11 across the 1 of their papers we have counts for
18 papers
Hamiltonian perturbation theory in f(R) gravity
Tuomas Multamäki, Jaakko Vainio, Iiro Vilja
Hamiltonian perturbation theory is used to analyse the stability of f(R) models. The Hamiltonian equations for the metric and its momentum conjugate are written for f(R) Lagrangian…
Constraints on the three-fluid model of curvaton decay
Tuomas Multamaki, Jani Sainio, Iiro Vilja
A three fluid system describing the decay of the curvaton is studied by numerical and analytical means. We place constraints on the allowed interaction strengths between the fluids…
Bayesian analysis of Friedmannless cosmologies
Oystein Elgaroy, Tuomas Multamaki
Assuming only a homogeneous and isotropic universe and using both the 'Gold' Supernova Type Ia sample of Riess et al. and the results from the Supernova Legacy Survey, we calculate…
Cosmological expansion and the uniqueness of gravitational action
T. Multamaki, I. Vilja
Modified theories of gravity have recently been studied by several authors as possibly viable alternatives to the cosmological concordance model. Such theories attempt to explain t…
Spatial dynamics of homochiralization
Tuomas Multamaki, Axel Brandenburg
The emergence and spreading of chirality on the early Earth is considered by studying a set of reaction-diffusion equations based on a polymerization model. It is found that effect…
Warped and compact extra dimensions: 5D branes in 6D models
T. Multamaki, I. Vilja
We consider six dimensional brane world models with a compact and a warped extra dimension with five dimensional branes. We find that such scenarios have many interesting features…