Quintessential interpretation of the evolving dark energy in light of DESI

Quintessential interpretation of the evolving dark energy in light of DESI

July 9, 2024 | Yuichiro Tada, Takahiro Terada
The paper discusses the interpretation of recent Dark Energy Spectroscopic Instrument (DESI) results in the context of evolving dark energy, parameterized by the $w_0 w_a$ CDM model. The authors propose that these results can be explained using a quintessential scalar field, which eventually becomes phantom in the past. They relax the assumption on the functional form of the equation-of-state (EoS) parameter $w = w(a)$ and consider a more realistic quintessential model. The implications of the DESI result for the Swanpland conjectures, cosmic birefringence, and the fate of the Universe are also explored. The paper reconstructs the scalar potential and dynamics of the quintessential field, showing that the interpretation holds up until the field becomes phantom. The authors discuss the potential for future decelerated expansion and the possibility of a big crunch, depending on the shape of the potential. They also analyze the compatibility of the model with the Swampland de Sitter conjecture and the observed cosmic birefringence.The paper discusses the interpretation of recent Dark Energy Spectroscopic Instrument (DESI) results in the context of evolving dark energy, parameterized by the $w_0 w_a$ CDM model. The authors propose that these results can be explained using a quintessential scalar field, which eventually becomes phantom in the past. They relax the assumption on the functional form of the equation-of-state (EoS) parameter $w = w(a)$ and consider a more realistic quintessential model. The implications of the DESI result for the Swanpland conjectures, cosmic birefringence, and the fate of the Universe are also explored. The paper reconstructs the scalar potential and dynamics of the quintessential field, showing that the interpretation holds up until the field becomes phantom. The authors discuss the potential for future decelerated expansion and the possibility of a big crunch, depending on the shape of the potential. They also analyze the compatibility of the model with the Swampland de Sitter conjecture and the observed cosmic birefringence.
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