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| Main Authors: | , , , |
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| Format: | Preprint |
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2023
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2308.00342 |
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| _version_ | 1866909135898935296 |
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| author | Fu, Qi-Ming He, Meng-Ci Sui, Tao-Tao Zhang, Xin |
| author_facet | Fu, Qi-Ming He, Meng-Ci Sui, Tao-Tao Zhang, Xin |
| contents | In this paper, we present several explicit reconstructions for {the aether scalar tensor (AeST) theory} derived from the background of Friedmann-Lema$\hat{\textı}$tre-Robertson-Walker cosmological evolution. It is shown that the Einstein-Hilbert Lagrangian with a positive cosmological constant is the only Lagrangian capable of accurately replicating the exact expansion history of the $Λ$ cold dark matter ($Λ$CDM) universe filled solely with dust-like matter. However, the $Λ$CDM-era can be produced within the framework of the AeST theory for some other fluids, including a perfect fluid with $p=-(1/3)ρ$, multifluids, and nonisentropic perfect fluids. Moreover, we demonstrate that the $Λ$CDM-era also can be replicated with no real matter field for the AeST theory. The cosmic evolution resulting from both the power-law and de-Sitter solutions also can be obtained. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2308_00342 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Reconstruction of aether scalar tensor theory for various cosmological scenarios Fu, Qi-Ming He, Meng-Ci Sui, Tao-Tao Zhang, Xin General Relativity and Quantum Cosmology Cosmology and Nongalactic Astrophysics In this paper, we present several explicit reconstructions for {the aether scalar tensor (AeST) theory} derived from the background of Friedmann-Lema$\hat{\textı}$tre-Robertson-Walker cosmological evolution. It is shown that the Einstein-Hilbert Lagrangian with a positive cosmological constant is the only Lagrangian capable of accurately replicating the exact expansion history of the $Λ$ cold dark matter ($Λ$CDM) universe filled solely with dust-like matter. However, the $Λ$CDM-era can be produced within the framework of the AeST theory for some other fluids, including a perfect fluid with $p=-(1/3)ρ$, multifluids, and nonisentropic perfect fluids. Moreover, we demonstrate that the $Λ$CDM-era also can be replicated with no real matter field for the AeST theory. The cosmic evolution resulting from both the power-law and de-Sitter solutions also can be obtained. |
| title | Reconstruction of aether scalar tensor theory for various cosmological scenarios |
| topic | General Relativity and Quantum Cosmology Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2308.00342 |