| | |
| | |
Stat |
Members: 3645 Articles: 2'500'096 Articles rated: 2609
18 April 2024 |
|
| | | |
|
Article overview
| |
|
Conformal quantum effects and the anisotropic singularities of scalar-tensor theories of gravity | Edgard Gunzig
; Alberto Saa
; | Date: |
17 Jun 2004 | Journal: | Int.J.Theor.Phys. 43 (2004) 575-583 | Subject: | gr-qc | Abstract: | We show that the inclusion of a term $C_{abcd}C^{abcd}$ in the action can remove the recently described anisotropic singularity occurring on the hypersurface $F(phi)=0$ of scalar-tensor theories of gravity of the type $$ S=int d^4x sqrt{-g} {F(phi)R - partial_aphipartial^aphi -2V(phi)}, $$ preserving, by construction, all of their isotropic solutions. We show that, in principle, a higher order term of this type can arise from considerations about the renormalizability of the semiclassical approach to the theory. Such result brings again into consideration the quintessential models recently proposed based in a conformally coupled scalar field ($F(phi)=1-{1/6}phi^2$) with potential $V(phi)=frac{m}{2}phi^2 -frac{Omega}{4}phi^4$, that have been discharged as unrealistic precisely by their anisotropic instabilities on the hypersurface $F(phi)=0$. | Source: | arXiv, gr-qc/0406069 | Services: | Forum | Review | PDF | Favorites |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser claudebot
|
| |
|
|
|
| News, job offers and information for researchers and scientists:
| |