Antigravitation in the Universe
I.D. Novikov a, b, c
a Astro Space Centre, Lebedev Physical Institute, Russian Academy of Sciences, ul. Profsoyuznaya 84/32, Moscow, 117997, Russian Federation
b National Research Centre ‘Kurchatov Institute’, pl. akad. Kurchatova 1, Moscow, 123182, Russian Federation
c Niels Bohr International Academy, Niels Bohr Institute, Blegdamsvej 17, Copenhagen, DK-2100, Denmark
This paper addresses questions concerning how pressure affects the matter-matter gravitational interaction. It invalidates the often-used claim that in the general theory of relativity gravitation is produced not only by the mass density ρ but also by the pressure p through the combination ρ + 3p/c2. The way pressure actually influences gravitations is discussed together with some related problems.