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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…
gr-qc2025
The Persistence of Nonlinear Gravitational Wave Memory
Robert R. Caldwell
Nonlinear gravitational wave memory is a surprise of theoretical physics. Whereas it is understood that a gravitational wave induces oscillatory squeezing and stretching motion in…