Cosmic event horizons and the light-speed limit for relative radial motion

  title={Cosmic event horizons and the light-speed limit for relative radial motion},
  author={Markus P�ssel},
  journal={arXiv: General Relativity and Quantum Cosmology},
  • Markus P�ssel
  • Published 25 December 2019
  • Physics
  • arXiv: General Relativity and Quantum Cosmology
Cosmic event horizons separate spacetime into disjoint regions: those regions whose light signals can reach us, and more distant regions we cannot, even in principle, observe. For one type of cosmic horizon, associated with universes that keep expanding forever, there is a simple intuitive picture of where the cosmic horizon is located, in terms of the relative speed between a distant galaxy and our own approaching the speed of light: Where the light-speed limit is reached, light signals from… 

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