A corollary of general relativity that the velocity of light is anisotropic in a gravitational field has received little attention so far. It is shown that this anisotropy can be directly probed by an experiment initially proposed for testing the one-way velocity of light. The proposed experiment constitutes another test of general relativity since the anisotropy in the propagation of light in ...

Hawking predicted that a black hole should radiate with a temperature T = h̄g/2πkc, where g is the gravitational acceleration at the surface of the black hole, k is Boltzmann’s constant, and c is the speed of light. This results from the effect of the strong gravitation on the vacuum field. Shortly thereafter it was shown that a uniformly accelerated detector in vacuum responds just as though it...

virial theorem is important for understanding stellar structures. it produces an interesting connection between magnetic and gravitational energies. using the general form of the virial theorem including the magnetic field (toroidal magnetic field), we may explain the solar dynamo model in relation to variations of the magnetic and gravitational energies. we emphasize the role of the gravitatio...

In this article, we use mathematical tools to theoretically compute the surface gravitational acceleration of Mars with good pre- cision, and these theoretically, obtain very close results for values measured in experiments.

A gravity theory is developed with the metric ĝμν = gμν+B∂μφ∂νφ. In the present universe the additional contribution from the scalar field in the metric ĝμν can generate an acceleration in the expansion of the universe, without negative pressure and with a zero cosmological constant. In this theory, gravitational waves will propagate at a different speed from non-gravitational waves. It is sugg...

We discuss the testable predictions of a phenomenological model in which the accelerated expansion of the universe is the result of the action of a non-gravitational force field, rather than the effect of a negative-pressure dark-energy fluid or a modification of general relativity. We show that in such a scenario the cosmic acceleration felt by distant standard candles like SNIa depends on the...

A gravity theory is developed with the metric ĝμν = gμν+B∂μφ∂νφ. In the present universe the additional contribution from the scalar field in the metric ĝμν can generate an acceleration in the expansion of the universe, without negative pressure and with a zero cosmological constant. In this theory, gravitational waves will propagate at a different speed from non-gravitational waves. It is sugg...