Singularities in any physical theory are either remarkable indicators of the unknown
underlying fundamental theory, or indicate a change in the description of the physical reality …

Einstein's General Relativity (GR) is possibly one of the greatest intellectual achievements
ever conceived by the human mind. In fact, over the last century, GR has proven to be an …

Our aim is to propose a theory which goes beyond the classical formulation of
thermodynamics. This is achieved by enlarging the space of basic independent variables …

Recent cosmological observations have posed a challenge for traditional theories of gravity:
what is the force driving the accelerated expansion of the universe? What if dark energy or …

Modified gravity theories with geometry-matter coupling, in which the action is an arbitrary
function of the Ricci scalar and the matter Lagrangian [f (R, L m) gravity], and of the Ricci …

The full causal Müller-Israel-Stewart (MIS) theory of dissipative processes in relativistic fluids
is applied to a flat, homogeneous, and isotropic universe with bulk viscosity. It is clarified in …

We explain an accelerated expansion of the present Universe, suggested from observations
of supernovae of type Ia at high redshift, by introducing an antifrictional force that is self …

We discuss gauge theories of scale invariance beyond the Standard Model (SM) and
Einstein gravity. A consequence of gauging this symmetry is that their underlying 4D …

Assuming that dark energy may be treated as a fluid with a well-defined temperature, close
to equilibrium, we argue that if nowadays there is a transfer of energy between dark energy …

Cosmological equations were recently derived by Padmanabhan from the expansion of
cosmic space due to the difference between the degrees of freedom on the surface and in …