Degeneracy effects for bosons are more important for smaller particle mass, smaller temperature and higher number density. Bose condensation requires that particles be in the same lowest energy quantum state. We propose a ...
Maps of the Rees–Sciama (RS) effect are simulated using the parallel N-body code, hydra, and a run-time ray-tracing procedure. A method designed for the analysis of small, square cosmic microwave background (CMB) maps is ...
A certain vector-tensor (VT) theory of gravitation was tested in previous papers. In the background universe, the vector field of the theory has a certain energy density, which is appropriate to play the role of vacuum ...
It has been shown that black holes can be quantized by using Bohr's idea of quantizing the motion of an electron inside the atom. We apply these ideas to the universe as a whole. This approach reinforces the suggestion ...
From the equivalence principle, one gets the strength of the gravitational effect of a mass M on the metric at position r from it. It is proportional to the dimensionless parameter beta (2)=2GM/rc (2), which normally is a ...
Fullana Alfonso, Màrius Josep; Saez Milán, Diego Pascual; Arnau, J.V.; Puchades Colmenero, Neus(UP4 Institute of Sciences, S.L., 2018)
[EN] We make some considerations about Relativistic Positioning Systems (RPS). Four satellites are needed to position a user.
First of all we define the main concepts. Errors should be taken into account. Errors depend ...
[EN] We intend to use the description of the electron orbital trajectory in the de Broglie-Bohm (dBB) theory to assimilate to a geodesic corresponding to the General Relativity (GR) and get from it physical conclusions. ...
Much work has been done taking into account the possibility that the gravitational {\it constant} $G$ may vary with cosmological time $t$ (or with the cosmological scale factor $a(t)$). In many of these works the speed of ...
In today's gravity research there exist few modified gravitational theories which among other things predict the existence of a Yukawa-type correction to the classical gravitational potential. In this paper we study the ...