Short-distance repulsive gravity as a consequence of the non-trivial PPN parameters β and γ.

Details Short-distance repulsive gravity as a consequence of the non-trivial PPN parameters β and γ. Short-distance repulsive gravity as a consequence of the non-trivial PPN parameters β and γ.

Aug 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996phlb..383...31k&link_type=abstract

Physics Letters B, Vol. 383, No. 1, p. 31 - 38

Physics

4

Stellar Collapse: Gravitation Theory

Scientific paper

The authors look for a graviton-dilaton theory which can predict non-trivial values of the PPN parameters β and/or γ for a charge neutral point star, without any naked singularity. With the potential for the dilaton φ set to zero, it contains one arbitrary function ψ(φ). The requirements impose certain constraints on ψ, which lead to the following generic and model-independent novel results: For a charge neutral point star, the gravitational force becomes repulsive at distances of the order of, but greater than, the Schwarzschild radius r0. There is also no horizon for r > r0. These results suggest that black holes are unlikely to form in a stellar collapse in this theory.

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