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Status: Unchecked ×Keyword: Friedmann equations ×Clear all

2 claims from 1 paper

1. Physics and Astronomy › Cosmology and Gravitation Theories

   Quantum stress-energy at timelike boundaries: testing a new beyond-$Λ$CDM parameter with cosmological data

   Philcox, Silverstein and Torroba · arXiv (Cornell University) · 2025

   The paper studies how timelike boundaries carrying quantum stress energy would alter cosmic expansion, and tests this extra component against Planck, ACT and DESI data, finding a slight preference of about 2σ.

   Unchecked2 claims
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   1. UncheckedQuantum vacuum fluctuations gathered at timelike boundaries in spacetime could be negative and large enough to rival matter and dark energy in the cosmic energy budget.“This accumulation of vacuum fluctuations of quantum fields can be consistently negative and UV sensitive, providing an additional source of cosmic energy density strong enough to compete with matter and dark energy.”
   2. UncheckedIf the boundaries keep a fixed comoving size, their quantum stress-energy adds a new term to the Friedmann equation that scales as -1/a.“For boundary conditions enabling a solution with fixed comoving boundary size, this effect contributes a qualitatively new term to the Friedmann equation determining the expansion history, scaling like $-1/a$ for scale factor $a$.”