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From Rindler Fluid to Dark Fluid on the Holographic Cutoff Surface
by Rong-Gen Cai, Gansukh Tumurtushaa, Yun-Long Zhang
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Submission summary
| Authors (as registered SciPost users): | Yun-Long Zhang |
| Submission information | |
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| Preprint Link: | scipost_202010_00031v2 (pdf) |
| Date accepted: | 2020-12-09 |
| Date submitted: | 2020-12-01 16:25 |
| Submitted by: | Zhang, Yun-Long |
| Submitted to: | SciPost Physics Proceedings |
| Proceedings issue: | 4th International Conference on Holography, String Theory and Discrete Approach in Hanoi (STRHAN2020) |
| Ontological classification | |
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| Academic field: | Physics |
| Specialties: |
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| Approach: | Theoretical |
Abstract
As an approximation to the near horizon regime of black hols, the Rindler fluid was proposed on an accelerating cutoff surface in the flat spacetime. The concept of the Rindler fluid was then generalized into a flat bulk with the cutoff surface of the induced de Sitter and FRW universe, such that an effective description of dark fluid in the accelerating universe can be investigated.
Author comments upon resubmission
List of changes
1). Is there an action in 5D from which Eq.(1) can be derived?
Re 1). Yes! There is an action for this, which is similar to the DGP braneworld model, that has been added in eq.(5).
2) What does motivate such a simple form?
Re 2) It is inspired by the fluid/gravity duality on the finite cutoff surface, in references [8-9].
3) Is this related to the idea that DM comes simply from the gravitational dynamics and not from any hidden matter sector couple to the standard model?
Re 3). The answer is a bit subtle but interesting. We have shown the duality between two viewpoints on the dark matter. From the 5 dimensional point of view, there is indeed an extra dimension, which belongs to the modified gravity. However, from the 4-dimensional point of view, the dark matter is described by the holographic stress-energy tensor, which is still a kind of matter, but only have the gravitational interaction with the standard model sector.
Published as SciPost Phys. Proc. 4, 003 (2021)