Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1995-05-24
Physics
High Energy Physics
High Energy Physics - Theory
11 pages. Latex File. Invited Talk presented at the XI DAE Symposium held during 21 - 28 December 1994 in Shantiniketan, India
Scientific paper
Analysing the static, spherically symmetric graviton-dilaton solutions in low energy string and Brans-Dicke theory, we find the following. For a charge neutral point star, these theories cannot predict non trivial PPN parameters, $\beta$ and $\gamma$, without introducing naked singularities. We then couple a cosmological constant $\Lambda$ as in low energy string theory. We find that only in low energy string theory, a non zero $\Lambda$ leads to a curvature singularity, which is much worse than a naked singularity. Requiring its absence upto a distance $r_*$ implies a bound $| \Lambda | < 10^{- 102} (\frac{r_*}{{\rm pc}})^{- 2}$ in natural units. If $r_* \simeq 1 {\rm Mpc}$ then $| \Lambda | < 10^{- 114}$ and, if $r_* \simeq 10^{28} {\rm cm}$ then $| \Lambda | < 10^{- 122}$ in natural units.
No associations
LandOfFree
Implications of Some Static Spherically Symmetric Graviton-Dilaton Solutions in Brans-Dicke and Low Energy String Theory does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Implications of Some Static Spherically Symmetric Graviton-Dilaton Solutions in Brans-Dicke and Low Energy String Theory, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Implications of Some Static Spherically Symmetric Graviton-Dilaton Solutions in Brans-Dicke and Low Energy String Theory will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-408890