Bimetric structure formation: Non-Gaussian predictions

Analytical predictions of non-Gaussian distribution parameters for stellar plasmas

Stimulated by the recent debate on the physical relevance and on the predictivity of q-Gaussian formalism, we present specific analytical expressions for the parameters characterizing non-Gaussian distributions, such as the nonextensive parameter q, expressions that we have proposed for different physical systems, an important example being plasmas in the stellar cores.

No consistent bimetric gravity?

Two-tensor, bimetric (or ‘‘f-g’’) gravity (BMG) was born as the fusion of the strong-interaction resonances of the 1960s (specifically that of a massive spin 2 field) with general relativity’s (GR) massless metric [1]. The idea was to join the two symmetrically by giving each its own Einstein-Hilbert action, then coupling the two resulting ‘‘spaces’’ through a nonderivative ‘‘mass term’’ that n...

Non-Equilibrium Dynamics and Structure Formation

Estimation of non-Gaussian Affine Term Structure Models

We develop a new approach to estimate Gaussian and non-Gaussian affine term structure models. We construct an exact concentrated log-likelihood function that reduces the dimension of the parameter space and eliminates parameters that often cause problems for conventional estimation procedures. As a separate contribution, we derive the analytical gradients for the log-likelihood. Our approach ou...

Predictions of mixed non - Gaussian cosmological density fields for the cosmic microwave background radiation

We present simulations of the Cosmic Microwave Background Radiation (CMBR) power spectrum for a class of mixed, non-Gaussian, primordial random fields. We assume a skew positive mixed model with adiabatic inflation perturbations plus additional isocurvature perturbations possibly produced by topological defects. The joint probability distribution used in this context is a weighted combination o...