Now showing items 1-5 of 5
Different representations of the Levi-Civita Bertotti Robinson solution
(Springer Verlag, 2013-04-23)
The Levi-Civita Bertotti Robinson (LBR) spacetime is investigated in various coordinate systems. By means of a general formalism for constructing coordinates in conformally flat spacetimes, coordinate transformations ...
The Cosmic Causal Mass
In order to provide a better understanding of rotating universe models, and in particular the Gödel universe, we discuss the relationship between cosmic rotation and perfect inertial dragging. In this connection, the concept ...
I show here that there are some interesting differences between the predictions of warm and cold inflation models focusing in particular upon the scalar spectral index ns and the tensor-to-scalar ratio r. The first thing ...
The twin paradox and the principle of relativity
(Institute of Physics Publ., 2013-02-14)
The twin paradox is intimately related to the principle of relativity. Two twins A and B meet, travel away from each other and meet again. From the point of view of A, B is the traveller. Thus, A predicts B to be younger ...
Predictions of Spectral Parameters by Several Inflationary Universe Models in light of the Planck Results
I give a review of predictions of values of spectral parameters for a large number of inﬂationary models. The present review includes detailed deductions and information about the approximations that have been made, written ...