119 citations · 340 across the 8 of their papers we have counts for
8 papers
Lorentz invariance, vacuum energy, and cosmology
F. R. Klinkhamer
This contribution reviews recent work on a new approach to the cosmological constant problem, which starts from the macroscopic behavior of a conserved relativistic microscopic var…
New indirect bounds on Lorentz violation in the photon sector
F. R. Klinkhamer
Direct laboratory bounds on the 9 nonbirefringent Lorentz-violating dimensionless parameters of modified-Maxwell theory range from the 10^{-7} level to the 10^{-16} level. The dete…
UHECR bounds on Lorentz violation in the photon sector
F. R. Klinkhamer
The aim of this brief review is to present a case study of how astrophysics data can be used to get bounds on Lorentz-violating parameters. For this purpose, a particularly simple…
Addendum: Ultrahigh-energy cosmic-ray bounds on nonbirefringent modified-Maxwell theory
F. R. Klinkhamer, M. Risse
Nonbirefringent modified-Maxwell theory, coupled to standard Dirac particles, involves nine dimensionless parameters, which can be bounded by the inferred absence of vacuum Cherenk…
Equilibrium boundary conditions, dynamic vacuum energy, and the Big Bang
F. R. Klinkhamer
The near-zero value of the cosmological constant Λin an equilibrium context may be due to the existence of a self-tuning relativistic vacuum variable q. Here, a cosmological nonequ…
Small-Scale Structure of Spacetime: Bounds and Conjectures
F. R. Klinkhamer
This review consists of two parts. The first part establishes certain astrophysical bounds on the smoothness of classical spacetime. Some of the best bounds to date are based on th…