When One-Parameter Dark Energy Makes Neutrinos Physical Again
Abstract
A puzzling implication of current data interpreted in the cosmology is the preference for a negative sum of neutrino masses. Moving to w0waCDM brings an appreciable fraction of the neutrino mass posterior back to positive values, while the constant equation-of-state dark energy case wCDM does not. We investigate a variety of one-parameter dark energy equations of state (DE EoS), each variation with particular physical properties, to understand whether a two-parameter DE EoS is required to bring the neutrino mass positive. The conclusion is that certain one-parameter DE EoS can suffice, implying that the data are pointing toward physical characteristics rather than a broad degeneracy. The required characteristics are identified as phantom dark energy at high redshift, crossing w=-1 at lower redshift.
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