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Gravity theory that passes the classical tests but does not have black holes | | Alexander Torres-Gomez
; Kirill Krasnov
; | | Date: |
12 Nov 2008 | | Abstract: | We revisit a propagating torsion gravity theory obtained by introducing a
field coupled to the topological term in the first-order Einstein-Cartan
action. The resulting theory has second order field equations, no adjustable
coupling constants, and one more propagating degree of freedom as compared to
general relativity. Thus, one might suspect that it should be easily ruled out
by e.g. the solar system tests. To see whether this is the case, we obtain the
spherically-symmetric solution of the theory, and show that it is characterized
by the usual mass and an additional parameter. To our great surprise we find
that the leading order corrections to the usual Newtonian behaviour are exactly
as in general relativity, and, in particular, are independent of the new
parameter. Thus, the theory passes the classical gravity tests. The analysis of
the global structure of the solution leads to yet another surprising feature of
the theory: the spherically-symmetric solution is never a black hole. One
either has a naked curvature singularity or a wormhole solution connecting two
asymptotic regions. | | Source: | arXiv, 0811.1998 | | Services: | Forum | Review | PDF | Favorites | |
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