In this paper,we present several explicit reconstructions for the aether scalar tensor(AeST)theory derived from the background of the Friedmann-Lemaître-Robertson-Walker cosmological evolution.It is shown that th...In this paper,we present several explicit reconstructions for the aether scalar tensor(AeST)theory derived from the background of the Friedmann-Lemaître-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 theΛcold dark matter(ΛCDM)universe filled solely with dust-like matter.However,theΛCDM-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 theΛCDM-era 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 can also be obtained.展开更多
基金the National Natural Science Foundation of China(11975072,11875102,11835009)National SKA Program of China(2022SKA0110200,2022SKA0110203)+1 种基金Shaanxi Provincial Education Department(21JK0556)Shaanxi Provincial Department of Science and Technology(2023-JC-QN-0077)。
文摘In this paper,we present several explicit reconstructions for the aether scalar tensor(AeST)theory derived from the background of the Friedmann-Lemaître-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 theΛcold dark matter(ΛCDM)universe filled solely with dust-like matter.However,theΛCDM-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 theΛCDM-era 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 can also be obtained.
