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Title: Constraining spacetime noncommutativity with primordial nucleosynthesis

Abstract

We discuss a constraint on the scale {lambda}{sub NC} of noncommutative (NC) gauge field theory arising from consideration of the big bang nucleosynthesis of light elements. The propagation of neutrinos in the NC background described by an antisymmetric tensor {theta}{sup {mu}}{sup {nu}} does result in a tree-level vectorlike coupling to photons in a generation-independent manner, raising thus a possibility to have an appreciable contribution of three light right-handed (RH) fields to the energy density of the Universe at nucleosynthesis time. Considering elastic scattering processes of the RH neutrinos off charged plasma constituents at a given cosmological epoch, we obtain for a conservative limit on an effective number of additional doublet neutrinos {delta}N{sub {nu}}=1, a bound {lambda}{sub NC} > or approx. 3 TeV. With a more stringent requirement, {delta}N{sub {nu}} < or approx. 0.2, the bound is considerably improved, {lambda}{sub NC} > or approx. 10{sup 3} TeV. For our bounds the {theta} expansion of the NC action stays always meaningful, since the decoupling temperature of the RH species is perseveringly much less than the inferred bound for the scale of noncommutativity.

Authors:
 [1];  [2]
  1. Physics Division, Rudjer Boskovic Institute, Zagreb (Croatia)
  2. Theoretical Physics Division, Rudjer Boskovic Institute, Zagreb (Croatia)
Publication Date:
OSTI Identifier:
21308382
Resource Type:
Journal Article
Journal Name:
Physical Review. D, Particles Fields
Additional Journal Information:
Journal Volume: 79; Journal Issue: 8; Other Information: DOI: 10.1103/PhysRevD.79.087701; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0556-2821
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CONFIGURATION; COSMOLOGY; COUPLING; DECOUPLING; ELASTIC SCATTERING; ENERGY DENSITY; EXPANSION; GAUGE INVARIANCE; NEUTRINOS; NUCLEOSYNTHESIS; PEV RANGE; PHOTONS; PLASMA; QUANTUM FIELD THEORY; SPACE-TIME; TEV RANGE; UNIVERSE

Citation Formats

Horvat, Raul, and Trampetic, Josip. Constraining spacetime noncommutativity with primordial nucleosynthesis. United States: N. p., 2009. Web. doi:10.1103/PHYSREVD.79.087701.
Horvat, Raul, & Trampetic, Josip. Constraining spacetime noncommutativity with primordial nucleosynthesis. United States. https://doi.org/10.1103/PHYSREVD.79.087701
Horvat, Raul, and Trampetic, Josip. 2009. "Constraining spacetime noncommutativity with primordial nucleosynthesis". United States. https://doi.org/10.1103/PHYSREVD.79.087701.
@article{osti_21308382,
title = {Constraining spacetime noncommutativity with primordial nucleosynthesis},
author = {Horvat, Raul and Trampetic, Josip},
abstractNote = {We discuss a constraint on the scale {lambda}{sub NC} of noncommutative (NC) gauge field theory arising from consideration of the big bang nucleosynthesis of light elements. The propagation of neutrinos in the NC background described by an antisymmetric tensor {theta}{sup {mu}}{sup {nu}} does result in a tree-level vectorlike coupling to photons in a generation-independent manner, raising thus a possibility to have an appreciable contribution of three light right-handed (RH) fields to the energy density of the Universe at nucleosynthesis time. Considering elastic scattering processes of the RH neutrinos off charged plasma constituents at a given cosmological epoch, we obtain for a conservative limit on an effective number of additional doublet neutrinos {delta}N{sub {nu}}=1, a bound {lambda}{sub NC} > or approx. 3 TeV. With a more stringent requirement, {delta}N{sub {nu}} < or approx. 0.2, the bound is considerably improved, {lambda}{sub NC} > or approx. 10{sup 3} TeV. For our bounds the {theta} expansion of the NC action stays always meaningful, since the decoupling temperature of the RH species is perseveringly much less than the inferred bound for the scale of noncommutativity.},
doi = {10.1103/PHYSREVD.79.087701},
url = {https://www.osti.gov/biblio/21308382}, journal = {Physical Review. D, Particles Fields},
issn = {0556-2821},
number = 8,
volume = 79,
place = {United States},
year = {Wed Apr 15 00:00:00 EDT 2009},
month = {Wed Apr 15 00:00:00 EDT 2009}
}