Physical versus phantom dark energy after DESI: thawing quintessence in a curved background

Simple item page
dc.contributor.authorDinda, Bikash
dc.contributor.authorMaartens, Roy
dc.date.accessioned2025-11-06T07:13:27Z
dc.date.available2025-11-06T07:13:27Z
dc.date.issued2025
dc.description.abstractRecent data from Dark Energy Spectroscopic Instrument, in combination with other data, provide moderate evidence of dynamical dark energy, w = −1. In the w 0 , w a parametrization of w, there is a preference for a phantom crossing, w < −1, at redshift z ∼ 0 . 5. In general relativity, the phantom equation of state is unphysical. Thus, it is important to check whether phantom crossing is present in other physically self-consistent models of dark energy that have equi v alent e vidence to the w 0 , w a parametrization. We find that thawing quintessence with non-zero cosmic curvature can fit the recent data as well as w 0 , w a in a flat background, based on both parametric and realistic scalar field evolutions. Although the realistic model does not allow w < −1, the parametrizations do allow it. However even if we allow w < −1 the data do not enforce phantom crossing. Thus, the phantom crossing is an artefact of a parametrization that is not based on a physical model.
dc.identifier.citationDinda, B. R. & Maartens, R. (2025) Physical versus phantom dark energy after DESI: thawing quintessence in a curved background. Monthly notices of the Royal Astronomical Society. Letters. [Online] 542 (1), L31–L35.
dc.identifier.urihttps://doi.org/10.1093/mnrasl/slaf063
dc.identifier.urihttps://hdl.handle.net/10566/21381
dc.language.isoen
dc.publisherOxford University Press
dc.subjectcosmological parameters
dc.subjectdark energy
dc.subjectcosmology: theory
dc.subjectParametrization
dc.subjectphantom crossing
dc.titlePhysical versus phantom dark energy after DESI: thawing quintessence in a curved background
dc.typeArticle

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
dinda_physical_versus-phantom_dark_energy_2025.pdf
Size:
764.74 KB
Format:
Adobe Portable Document Format
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.71 KB
Format:
Item-specific license agreed upon to submission
Description:
Download

Collections

Research Articles (Physics)