Current observations favour phantom-enhanced nature of dark energy

Current observations favour phantom-enhanced nature of dark energy
Md. Wali Hossain
arXiv:2512.16731v1 Announce Type: new
Abstract: Our study shows that the more a dark energy model allows the equation of state to become phantom-like toward the past, the better it fits current observations which also may lead to stronger statistical tension with $Lambda$CDM. In particular, models with greater flexibility in their redshift evolution, such as power-law type forms, are mildly preferred over more restrictive parametrizations with similar parameter dimensionality. For the dataset including DESY5, the deviation from $Lambda$CDM reaches a significance of $6.26sigma$. These results indicate that present data are sensitive to enhanced phantom behaviour and provide clear guidance for constructing phenomenologically viable dark energy parametrizations.arXiv:2512.16731v1 Announce Type: new
Abstract: Our study shows that the more a dark energy model allows the equation of state to become phantom-like toward the past, the better it fits current observations which also may lead to stronger statistical tension with $Lambda$CDM. In particular, models with greater flexibility in their redshift evolution, such as power-law type forms, are mildly preferred over more restrictive parametrizations with similar parameter dimensionality. For the dataset including DESY5, the deviation from $Lambda$CDM reaches a significance of $6.26sigma$. These results indicate that present data are sensitive to enhanced phantom behaviour and provide clear guidance for constructing phenomenologically viable dark energy parametrizations.