English

Einstein equations with cosmological constant in Super Space-Time

General Relativity and Quantum Cosmology 2021-08-27 v1 Mathematical Physics math.MP

Abstract

We introduce a new kind of super warped product spaces Mˉ(I)=I10×fMmn\bar{M}_{_{(I)}}=\textbf{I}^{1|0}\times_f M^{m|n}, Mˉ(II)=I01×fMmn\bar{M}_{_{(II)}}=\textbf{I}^{0|1}\times_{f} M^{m|n}, and Mˉ(III)=I11×fMmn\bar{M}_{_{(III)}}=\textbf{I}^{1|1}\times_{f} M^{m|n}, where MmnM^{m|n} is a supermanifold of dimension mnm|n, Iδδ\textbf{I}^{\delta|\delta'} is standard superdomain with I=(0,1)\textbf{I}=(0,1) and δ,δ{0,1}\delta,\delta' \in \{0,1\}, subject to the warp functions f(t)f(t), f(tˉ)f(\bar t), and f(t,tˉ)f(t, \bar t), respectively. In each super warped product space, Mˉ(I)\bar{M}_{_{(I)}}, Mˉ(II)\bar{M}_{_{(II)}}, and Mˉ(III)\bar{M}_{_{(III)}}, it is shown that Einstein equations GˉAB=ΛˉgˉAB\bar{G}_{AB}=-\bar{\Lambda}\bar{g}_{AB}, with cosmological term Λˉ\bar{\Lambda} are reducible to the Einstein equations Gαβ=ΛgαβG_{\alpha\beta} = -\Lambda g_{\alpha\beta} on the super space MmnM^{m|n} with cosmological term Λ{\Lambda}, where Λˉ\bar{\Lambda} and Λ{\Lambda} are functions of f(t)f(t), f(tˉ)f(\bar t), and f(t,tˉ)f(t, \bar t), as well as (mm, nn). This dependence points to the origin of cosmological terms which turn out to be within the warped structure of the super space-time. By using the Generalized Robertson-Walker space-time, as a super space-time, and demanding for constancy of Λˉ\bar{\Lambda} we can determine the warp functions and Λ\Lambda which result in finding the solutions for Einstein equations GˉAB=ΛˉgˉAB\bar{G}_{AB}=-\bar{\Lambda}\bar{g}_{AB} and Gαβ=ΛgαβG_{\alpha\beta} = -\Lambda g_{\alpha\beta}. We have discussed the cosmological solutions, for each kind of super warped product space, in the special case of M30M^{3|0}.

Keywords

Cite

@article{arxiv.2108.11437,
  title  = {Einstein equations with cosmological constant in Super Space-Time},
  author = {F. Gholami and F. Darabi and M. Mohammadi and S. Varsaie and M. Roshande},
  journal= {arXiv preprint arXiv:2108.11437},
  year   = {2021}
}

Comments

14 pages

R2 v1 2026-06-24T05:25:18.734Z