Dirac Fields in Loop Quantum Gravity and Big Bang Nucleosynthesis

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dc.creatorBojowald, Martin
dc.creatorDas, Rupam
dc.creatorScherrer, Robert J.
dc.date2007-10-30
dc.date2008-03-19
dc.date.accessioned2026-07-07T11:12:48Z
dc.date.available2026-07-07T11:12:48Z
dc.descriptionBig Bang nucleosynthesis requires a fine balance between equations of state for photons and relativistic fermions. Several corrections to equation of state parameters arise from classical and quantum physics, which are derived here from a canonical perspective. In particular, loop quantum gravity allows one to compute quantum gravity corrections for Maxwell and Dirac fields. Although the classical actions are very different, quantum corrections to the equation of state are remarkably similar. To lowest order, these corrections take the form of an overall expansion-dependent multiplicative factor in the total density. We use these results, along with the predictions of Big Bang nucleosynthesis, to place bounds on these corrections.
dc.description15 pages, 2 figures; v2: new discussion of relevance of quantum gravity corrections (Sec. II) and new estimates (Sec. V)
dc.identifierhttps://arxiv.org/abs/0710.5734
dc.identifierhttp://arxiv.org/abs/0710.5734
dc.identifierPhys.Rev.D77:084003,2008
dc.identifierdoi:10.1103/PhysRevD.77.084003
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/191500
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectHigh Energy Physics - Theory
dc.titleDirac Fields in Loop Quantum Gravity and Big Bang Nucleosynthesis
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