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Gravity effects of the quantum vacuum. Dark energy and dark matter
Emilio Santos
The stress-energy tensor of the quantum vacuum is studied for the particular case of quantum electrodynamics (QED), that is a fictituous universe where only the electromagnetic and…
Can modified gravity prevent the gravitational collapse to black hole?
Emilio Santos
It is shown that the theoretical arguments for the unavoidable collapse of massive stars, which are valid within standard general relativity, are not valid in extended gravity. In…
Constraints on fourth order generalized f(R) gravity
Emilio Santos
A fourth order generalized f(R) gravity theory (FOG) is considered with the Einstein-Hilbert action being Ricci\'{}s tensor and R the curvature s…
Neutron stars in generalized f(R) gravity
Emilio Santos
Quartic gravity theory is considered with the Einstein-Hilbert Lagrangean being Ricciś tensor and R the curvature scalar. The parameters and…
Dark energy as a curvature of space-time induced by quantum vacuum fluctuations
Emilio Santos
It is shown that quantum vacuum fluctuations give rise to a curvature of space-time of the order appropriate to explain the observed accelerated expansion of the universe. The fact…
Space-time curvature due to quantum vacuum fluctuations: An alternative to dark energy?
Emilio Santos
It is pointed out that quantum vacuum fluctuations may give rise to a curvature of space-time equivalent to the curvature currently attributed to dark energy. A simple calculation…