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Determinant-Gravity: Cosmological implications | | D. Comelli
; A. Dolgov
; | | Date: |
15 Apr 2004 | | Journal: | JHEP 0411 (2004) 062 | | Subject: | gr-qc | | Abstract: | We analyze the action $int d^4x sqrt{det||{cal B} g_{mu
u}+ {cal C} R_{mu
u}}||$ as a possible alternative or addition to the Einstein gravity. Choosing a particular form of ${cal B}(R)= sqrt {R}$ we can restore the Einstein gravity and, if ${cal B}=m^2$, we obtain the cosmological constant term. Taking ${cal B} = m^2 + {cal B}_1 R$ and expanding the action in $ 1/m^2$, we obtain as a leading term the Einstein Lagrangian with a cosmological constant proportional to $m^4$ and a series of higher order operators. In general case of non-vanishing ${cal B}$ and ${cal C}$ new cosmological solutions for the Robertson-Walker metric are obtained. | | Source: | arXiv, gr-qc/0404065 | | Services: | Forum | Review | PDF | Favorites | |
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