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gr-qc2026
Charging Across the Phantom Divide with Modified Gravity
Rodrigo Calderon, Eric V. Linder
Cosmology where the effective dark energy crosses can be realized in Horndeski gravity with shift symmetric terms plus a linear potential. We highlight the special role of t…
gr-qc2026
Self-Reflection in a Moving Mirror
Michael R. R. Good, Eric V. Linder
We present an analytic flat-spacetime accelerating boundary analog of Hawking-type emission that possesses infinite asymptotic acceleration (and radial acceleration in the black ho…
gr-qc2025
Cosmic Acceleration from Nothing
Michael R. R. Good, Eric V. Linder
We demonstrate that if the universe started as a vacuum fluctuation rather than from a singular Big Bang state, the universe must have a late-time cosmic acceleration. This is requ…