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When One-Parameter Dark Energy Makes Neutrinos Physical Again
Weiqiang Yang, Eleonora Di Valentino, Eric V. Linder +2
A puzzling implication of current data interpreted in the -Cold Dark Matter cosmology is the preference for a negative sum of neutrino masses. Moving to CDM brings an ap…
Cosmology after Phantom Crossing by Horndeski Gravity
Eric V. Linder
One possible way to explain the observed effective dark energy equation of state crossing (the phantom divide) is through modified gravity. A key point is to not view the ex…
Null Impact of the Null Energy Condition in Current Cosmology
Robert R. Caldwell, Eric V. Linder
We clarify the role of the oft-misunderstood Null Energy Condition (NEC) in the context of the current cosmological data. In particular, the NEC implies the sum of the total energy…
Uplifting, Depressing, and Tilting Dark Energy
Eric V. Linder
Current data in the form of baryon acoustic oscillation, supernova, and cosmic microwave background distances prefer a cosmology that accelerates more strongly than CDM at $z\ap…
Interpreting Dark Energy Data Away from
Eric V. Linder
Dark energy away from a cosmological constant -- like early universe inflation that ends -- can be understood in terms of well defined physical behaviors. These guide dark ener…