期刊
PHYSICAL REVIEW LETTERS
卷 118, 期 2, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.118.021102
关键词
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资金
- Direccion General Asuntos del Personal Academico, Universidad Nacional Autonoma de Mexico (DGAPA-UNAM) [IG100316]
- Consejo Nacional de Ciencia y Tecnologia (CONACyT) [101712]
- Investissements d'Avenir French government program [ANR-11-LABX-0060, ANR-11-IDEX-0001-02]
- Agence Nationale de la Recherche (ANR) [ANR-11-LABX-0060] Funding Source: Agence Nationale de la Recherche (ANR)
In this Letter, we consider the possibility of reconciling metric theories of gravitation with a violation of the conservation of energy-momentum. Under some circumstances, this can be achieved in the context of unimodular gravity, and it leads to the emergence of an effective cosmological constant in Einstein's equation. We specifically investigate two potential sources of energy nonconservation-nonunitary modifications of quantum mechanics and phenomenological models motivated by quantum gravity theories with spacetime discreteness at the Planck scale-and show that such locally negligible phenomena can nevertheless become relevant at the cosmological scale.
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