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Dynamical dark energy in light of cosmic distance measurements II: a study using current observations

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arxiv 2404.06310 v3 pith:GF6HIS3C submitted 2024-04-09 astro-ph.CO

Xiaoma Wang , Gan Gu , Xiaoyong Mu , Shuo Yuan , Gong-Bo Zhao This is my paper · ORCID
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keywords darkenergydynamicalobservationscurrentfindacceleratingbehaviour
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abstract

We extract key information of dark energy from current observations of BAO, OHD and $H_0$, and find hints of dynamical behaviour of dark energy. In particular, a dynamical dark energy model whose equation of state crosses $-1$ is favoured by observations. We also find that the Universe has started accelerating at a lower redshift than expected.

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  1. The DESI DR1/DR2 evidence for dynamical dark energy is biased by low-redshift supernovae

    astro-ph.CO 2025-02 conditional novelty 5.0 of 10

    The DESI dynamical dark energy preference drops below 2 sigma after correcting a 0.043 mag intercept discrepancy in the low-redshift supernovae of DESY5.

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