Скачать или смотреть DESI DR2 results: Is dark energy changing?

Hi Spacecats, I'm Dr Maggie Lieu and welcome to my channel, where you can find all things space, astronomy and physics! The Dark Energy Spectroscopic Instrument (DESI) has made a groundbreaking discovery: evidence for evolving dark energy! The DESI data is consistent with the Lambda CDM model, but the parameters preferred by DESI BAO are in mild, 2.3\sigma tension, with those determined from the cosmic microwave background (CMB). This tension is alleviated by dark energy with a time-evolving equation of state parametrized by w0 and wa , which provides a better fit to the data. This solution is preferred over ACDM at 3.1\sigma for the combination of DESI BAO and CMB data. Unless there is an unknown systematic error associated with one or more datasets, it is clear that ACDM is being challenged by the combination of DESI BAO with other measurements and that dynamical dark energy offers a possible solution. Find out all about the evolving dark energy in this weeks video.

Links:
DESI DR1 paper: https://arxiv.org/pdf/2404.03002
DESI DR2 paper: https://arxiv.org/pdf/2503.14738

Media credits:
visualization map of ~1 million DESI Main Survey objects: David Kirkby / DESI collaboration
dR1: Fiske Planetarium/CU Boulder/DESI collaboration
DESI FLY through DESI Collaboration/DOE/KPNO/NOIRLab/NSF/AURA/Fiske Planetarium
DESI’s Year 3 Data Map: DESI Collaboration/DOE/KPNO/NOIRLab/NSF/AURA/R. Proctor
DESI 3D map: DESI Collaboration/DOE/KPNO/NOIRLab/NSF/AURA/R. Proctor
Other: DESI
Mayall telescope: KPNO/NOIRLab/NSF/AURA/T. Matsopoulos
DESI spectroscopic fibres: Claire Poppett/DESI Collaboration
ExpansionUniverse - Martin Kornmesser, Luis Calcada, NASA, ESA/Hubble
BAO - NASA GSFC
Quasar - ESO/Kornmesser
DESI DR2 BAO w constraints: Cristhian Garcia-Quintero


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