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Title: Reconciling BICEP2 and Planck results with right-handed Dirac neutrinos in the fundamental representation of grand unified E{sub 6}

Abstract

The tensor-to-scalar ratio (r = 0.20{sup +0.07}{sub −0.05}) inferred from the excess B-mode power observed by the Background Imaging of Cosmic Extragalactic Polarization (BICEP2) experiment is almost twice as large as the 95% CL upper limits derived from temperature measurements of the WMAP (r < 0.13) and Planck (r < 0.11) space missions. Very recently, it was suggested that additional relativistic degrees of freedom beyond the three active neutrinos and photons can help to relieve this tension: the data favor an effective number of light neutrino species N{sub eff} = 3.86±0.25. Since the BICEP2 ratio implies the energy scale of inflation (V{sub *}{sup 1/4} ∼ 2 × 10{sup 16} GeV) is comparable to the grand unification scale, in this paper we investigate whether we can accommodate the required N{sub eff} with three right-handed (partners of the left-handed standard model) neutrinos living in the fundamental representation of a grand unified exceptional E{sub 6} group. We show that the superweak interactions of these Dirac states (through their coupling to a TeV-scale Z' gauge boson) lead to decoupling of right-handed neutrino just above the QCD cross over transition: 175 MeV∼

Authors:
;  [1];  [2];  [3]
  1. Department of Physics, University of Wisconsin-Milwaukee, Milwaukee, WI, 53201 (United States)
  2. Department of Physics, Northeastern University, Boston, MA, 02115 (United States)
  3. Department of Physics, National Taiwan Normal University, Taipei, 116 Taiwan (China)
Publication Date:
OSTI Identifier:
22373510
Resource Type:
Journal Article
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2014; Journal Issue: 06; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1475-7516
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COSMOLOGICAL INFLATION; COUPLING; DEGREES OF FREEDOM; NEUTRINOS; PHOTONS; POLARIZATION; QUANTUM CHROMODYNAMICS; RELATIVISTIC RANGE; SPACE; STANDARD MODEL; TEMPERATURE MEASUREMENT; TENSORS; TEV RANGE

Citation Formats

Anchordoqui, Luis A., Vlcek, Brian J., Goldberg, Haim, and Huang, Xing. Reconciling BICEP2 and Planck results with right-handed Dirac neutrinos in the fundamental representation of grand unified E{sub 6}. United States: N. p., 2014. Web. doi:10.1088/1475-7516/2014/06/042.
Anchordoqui, Luis A., Vlcek, Brian J., Goldberg, Haim, & Huang, Xing. Reconciling BICEP2 and Planck results with right-handed Dirac neutrinos in the fundamental representation of grand unified E{sub 6}. United States. doi:10.1088/1475-7516/2014/06/042.
Anchordoqui, Luis A., Vlcek, Brian J., Goldberg, Haim, and Huang, Xing. Sun . "Reconciling BICEP2 and Planck results with right-handed Dirac neutrinos in the fundamental representation of grand unified E{sub 6}". United States. doi:10.1088/1475-7516/2014/06/042.
@article{osti_22373510,
title = {Reconciling BICEP2 and Planck results with right-handed Dirac neutrinos in the fundamental representation of grand unified E{sub 6}},
author = {Anchordoqui, Luis A. and Vlcek, Brian J. and Goldberg, Haim and Huang, Xing},
abstractNote = {The tensor-to-scalar ratio (r = 0.20{sup +0.07}{sub −0.05}) inferred from the excess B-mode power observed by the Background Imaging of Cosmic Extragalactic Polarization (BICEP2) experiment is almost twice as large as the 95% CL upper limits derived from temperature measurements of the WMAP (r < 0.13) and Planck (r < 0.11) space missions. Very recently, it was suggested that additional relativistic degrees of freedom beyond the three active neutrinos and photons can help to relieve this tension: the data favor an effective number of light neutrino species N{sub eff} = 3.86±0.25. Since the BICEP2 ratio implies the energy scale of inflation (V{sub *}{sup 1/4} ∼ 2 × 10{sup 16} GeV) is comparable to the grand unification scale, in this paper we investigate whether we can accommodate the required N{sub eff} with three right-handed (partners of the left-handed standard model) neutrinos living in the fundamental representation of a grand unified exceptional E{sub 6} group. We show that the superweak interactions of these Dirac states (through their coupling to a TeV-scale Z' gauge boson) lead to decoupling of right-handed neutrino just above the QCD cross over transition: 175 MeV∼},
doi = {10.1088/1475-7516/2014/06/042},
journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 06,
volume = 2014,
place = {United States},
year = {2014},
month = {6}
}