TITLE: The second rise of general relativity in astrophysics. Basic principle
PRESENTED BY: L. Neslusan
ABSTRACT: When a model of a relativistic compact object (RCO), e.g. a neutron star,
is constructed, it is postulated that the distribution of matter inside the object
must be qualitatively the same as in the Newtonian physics, i.e. the object has
to occupy the sphere from its outer physical surface down to its center. Because
of this postulate, only a tiny fraction of the solutions offered us by the general
relativity is used to model the RCOs. In the presentation, it is shown that the full
sphere is not a typical form that the Einstein field equations imply. On contrary,
it is a sphere having a spherical void (vacuum) in its central region and, therefore,
also the inner physical surface. The basic principle how the void and inner surface
occur is explained. There are also outlined some consequences of eventual abolition
of the postulate: there is no upper mass limit of neutron stars or other RCOs,
the supermassive RCOs in the centers of galaxies and quasars can emit a radiation
from their photospheres always situated above the event horizon, the gravitational
acceleration of particles in a vicinity of RCO is not linearly proportional to its
energy (or mass when it is calculated with the help of the Einstein's formula that
energy is the product of mass and quadrate of the speed of light), etc.