Time reversal and negative energies in general relativity

1999/06/03 by J. M. Ripalda, Jose M. Ripalda, Ripalda, Jose M. · 1 citation
Physics and Astronomy · #Astrophysics (astro-ph) #Cosmology and Gravitation Theories #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #High Energy Physics - Theory (hep-th) #Quantum Physics (quant-ph) #Radio Astronomy Observations and Technology #Relativity and Gravitational Theory #astro-ph #gr-qc #hep-th #quant-ph

paper · pdf · doi:10.48550/arxiv.gr-qc/9906012

openalex publication_date 1999/06/03 · arxiv created 2010/08/16 · arxiv updated 2010/08/17 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

The significance of past-pointing four-vectors and negative energies in general relativity is discussed. The sign of the energy is not absolute, but relative to the four-velocity of the observer, and every particle/observer always measures its own mass as positive. It is shown that the description of the interaction of past-pointing and future-pointing matter in general relativity requires two metric tensors for self-consistency. This aspect of general relativity might account for the observations that led to the proposal of "dark energy" and non-baryonic "dark matter".

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