3 papers
astro-ph.CO2025
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…
astro-ph.CO2025
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…
astro-ph.CO2025
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…