2011/11/30 by Luis A. Anchordoqui, Luis Alfredo Anchordoqui, Haim Goldberg · 1 citation
Physics and Astronomy · #Astrophysics #Baryon #CMB cold spot #Cosmic microwave background #Cosmology #Cosmology and Gravitation Theories #Gauge (firearms) #Lepton #Lepton number #Neutrino #Neutrino Physics Research #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Physics beyond the Standard Model #Quantum chromodynamics #Quantum mechanics #Standard Model (mathematical formulation) #astro-ph.CO #gr-qc #hep-ph
paper · pdf · doi:10.1103/physrevlett.108.081805
References added; to be published in PRL
arxiv created 2011/12/30 · openalex publication_date 2012/02/23 · arxiv updated 2013/05/29 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The gauge-extended U(1)C\ifmmode×\else\texttimes\fiSU(2)L\ifmmode×\else\texttimes\fiU(1)_IR\ifmmode×\else\texttimes\fiU(1)L model elevates the global symmetries of the standard model (baryon number B and lepton number L) to local gauge symmetries. The U(1)L symmetry leads to three superweakly interacting right-handed neutrinos. This also renders a B\ensuremath-L symmetry nonanomalous. The superweak interactions of these Dirac states permit \ensuremathνR decoupling just above the QCD phase transition: 175\ensuremath\lesssimT_\ensuremathνRdec/MeV\ensuremath\lesssim250. In this transitional region, the residual temperature ratio between \ensuremathνL and \ensuremathνR generates extra relativistic degrees of freedom at BBN and at the CMB epochs. Consistency with both WMAP 7-year data and recent estimates of the primordial 4He mass fraction is achieved for 3<M_B\ensuremath-L/TeV<6. The model is fully predictive, and can be confronted with dijet and dilepton data from LHC7 and, eventually, LHC14.