Cosmic Clues: DESI, Dark Energy, and the Cosmological Constant Problem

Cosmic Clues: DESI, Dark Energy, and the Cosmological Constant Problem

9 Apr 2024 | Wen Yin
The paper discusses the cosmological constant problem (CCP) and its potential solutions, focusing on the Dark Energy Spectroscopic Instrument (DESI) data. The CCP, which concerns the extremely small value of the cosmological constant compared to the Standard Model mass scales, has been addressed through the introduction of a scalar field with a flat potential. The DESI collaboration's first-year results indicate a preference for time-varying dark energy, deviating from the ΛCDM model. The author proposes a model where the cosmological constant relaxes to a non-zero value during inflation, leading to time-varying dark energy. This model, based on a linear potential for the scalar field, explains the DESI anomaly and predicts a time-dependent dark energy consistent with the data. The paper also explores the implications of this model for the evolution of the universe and the possible signatures of the scalar field in observations, such as cosmic birefringence and neutrino decays. The author emphasizes the importance of further investigating these relaxation scenarios to address the CCP.The paper discusses the cosmological constant problem (CCP) and its potential solutions, focusing on the Dark Energy Spectroscopic Instrument (DESI) data. The CCP, which concerns the extremely small value of the cosmological constant compared to the Standard Model mass scales, has been addressed through the introduction of a scalar field with a flat potential. The DESI collaboration's first-year results indicate a preference for time-varying dark energy, deviating from the ΛCDM model. The author proposes a model where the cosmological constant relaxes to a non-zero value during inflation, leading to time-varying dark energy. This model, based on a linear potential for the scalar field, explains the DESI anomaly and predicts a time-dependent dark energy consistent with the data. The paper also explores the implications of this model for the evolution of the universe and the possible signatures of the scalar field in observations, such as cosmic birefringence and neutrino decays. The author emphasizes the importance of further investigating these relaxation scenarios to address the CCP.
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