3 papers
gr-qc2025
Black Holes Rule Out Heavy Tachyons
Mark P. Hertzberg, Abraham Loeb, Aidan Morehouse
We present direct observational constraints on tachyons; particles with group velocity greater than in vacuum in a Lorentz invariant theory. Since tachyons may have no direct c…
gr-qc2024
Critical Analysis of Replacing Dark Matter and Dark Energy with a Model of Stochastic Spacetime
Mark P. Hertzberg, Abraham Loeb
We analyze consequences of trying to replace dark matter and dark energy with models of stochastic spacetime. In particular, we analyze the model put forth by Ref. [1], in which it…
astro-ph.CO2024
Constraints on an Anisotropic Universe
Mark P. Hertzberg, Abraham Loeb
We analyze the possibility of global anisotropy of the universe. We consider an altered Friedmann Lemaitre Robertson Walker metric in which there are different scale factors along…