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13 papers · 2 filters
Superweakly interacting dark matter from the Minimal Walking Technicolor
Kimmo Kainulainen, Kimmo Tuominen, Jussi Virkajarvi
We study a superweakly interacting dark matter particle motivated by minimal walking technicolor theories. Our WIMP is a mixture of a sterile state and a state with the charges of…
Non-Gaussian Fingerprints of Self-Interacting Curvaton
Kari Enqvist, Sami Nurmi, Olli Taanila +1
We investigate non-Gaussianities in self-interacting curvaton models treating both renormalizable and non-renormalizable polynomial interactions. We scan the parameter space system…
Impact of cosmic inhomogeneities on SNe observations
Kimmo Kainulainen, Valerio Marra
We study the impact of cosmic inhomogeneities on the interpretation of SNe observations. We build an inhomogeneous universe model that can confront supernova data and yet is reason…
Effect of Background Evolution on the Curvaton Non-Gaussianity
Kari Enqvist, Tomo Takahashi
We investigate how the background evolution affects the curvature perturbations generated by the curvaton, assuming a curvaton potential that may deviate slightly from the quadrati…
A new stochastic approach to cumulative weak lensing
Kimmo Kainulainen, Valerio Marra
We study the weak gravitational lensing effects caused by a stochastic distribution of dark matter halos. We develop a simple approach to calculate the magnification probability di…
Supernovae data and perturbative deviation from homogeneity
Kari Enqvist, Maria Mattsson, Gerasimos Rigopoulos
We show that a spherically symmetric perturbation of a dust dominated FRW universe in the Newtonian gauge can lead to an apparent acceleration of standard candles and provide…