Cosmological Constant and Noncommutative Spacetime

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dc.creatorCalmet, Xavier
dc.date2005-10-19
dc.date.accessioned2026-07-07T11:43:52Z
dc.date.available2026-07-07T11:43:52Z
dc.descriptionWe show that the cosmological constant appears as a Lagrange multiplier if nature is described by a canonical noncommutative spacetime. It is thus an arbitrary parameter unrelated to the action and thus to vacuum fluctuations. The noncommutative algebra restricts general coordinate transformations to four-volume preserving noncommutative coordinate transformations. The noncommutative gravitational action is thus an unimodular noncommutative gravity. We show that spacetime noncommutativity provides a very natural justification to an unimodular gravity solution to the cosmological problem. We obtain the right order of magnitude for the critical energy density of the universe if we assume that the scale for spacetime noncommutativity is the Planck scale.
dc.description7 pages
dc.identifierhttps://arxiv.org/abs/hep-th/0510165
dc.identifierhttp://arxiv.org/abs/hep-th/0510165
dc.identifierEurophys.Lett.77:19902,2007
dc.identifierdoi:10.1209/0295-5075/77/19002
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/201398
dc.subjectHigh Energy Physics - Theory
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectHigh Energy Physics - Phenomenology
dc.titleCosmological Constant and Noncommutative Spacetime
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