L.M. Krauss and M.S. Turner, Gen. Rel. and Gravitation 27 (1995) 1137. Home/Search Document Not in Database Summary Related Articles Check |
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Lorentz Invariance and the Cosmological Constant - Bertolami (1997) (Correct)
.... [36] as standard candles that indicate h 0 = 0:67 Sigma 0:07, but are somewhat lower than the values emerging from studies using classical Cepheid variables observed by the Hubble Space Telescope, h 0 = 0:82 Sigma 0:17 [37] 5 (and Omega Matter 0 = 0:3 Gamma 0:4 with h 0 = 0:7 Gamma 0:8) [43]. In order to relate the theoretical possibility of spontaneous breaking of the Lorentz symmetry with the observational contraints and also with the nearly complete cancellation of the vacuum energy we parametrize the vacuum expectation values of the Lorentz tensors as suggested in Ref. 14] when ....
L.M. Krauss and M.S. Turner, Gen. Rel. and Gravitation 27 (1995) 1137.
Lorentz Invariance and the Cosmological Constant - Bertolami (1997) Self-citation (Bertolami) (Correct)
....different standing. Strings are non local objects and that gives origin, as depicted in (1) to interactions that are not present in renormalizable field theories. It is conceivable that non localities and duality symmetries present in string theories may provide the underlying awareness [21, 22] the high energy theory seems to have in order to account for the vanishing or almost perfect cancelling of contributions to the cosmological term at low energies. In this respect, it has been recently suggested by Witten [23] the possibility of relating, via a duality transformation, a ....
....in the hidden sector of supergravity theories interact only gravitationally and, in case of being light, may live long enough to dominate the energy density of the Universe. This is the well known Polonyi problem which is closely related with the issues of supersymmetry breaking and inflation [22, 25 33]. In what follows we shall assume that the mechanism accounting for the vanishing or nearly vanishing of the vacuum energy does cancel the contributions of all scalar fields to the vacuum energy. Nevertheless, if from the theoretical point of view on one hand it does seem that a symmetry is ....
M.C. Bento and O. Bertolami, Gen. Rel. and Gravitation 28 (1996) 565.
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