Neutrino-Mass Effects on the CMB Anisotropies in a Cosmological Model with a Primordial Magnetic Field

Journal Article · Wed May 21 04:00:00 EDT 2008 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2943624· OSTI ID:21143507

Kojima, K ^[1]; Yamazaki, D G ^[2]; Kajino, T ^[1]

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1. Department of Astronomy, Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033 (Japan)
2. Division of Theoretical Astrophysics, National Astronomical Observatory, 2-21-1 Osawa, Mitaka, Tokyo 181-8588 (Japan)

In recent years neutrino oscillation experiments have showed that neutrinos have finite mass. One can determine the neutrino mass from neutrinoless double-beta decay experiments, but the exact mass of neutrinos is still unknown. However, we can also constrain the neutrino mass from a precise analysis of the CMB data, which constrains the mass to be smaller than 2 eV (2{sigma}) in a standard {lambda}CDM model [1]. In recent studies it has beddn shown that a primordial magnetic field (PMF) exists, and it makes important effects on the CMB anisotropies. In this work, we constrain the total neutrino mass from the CMB anisotropies with the PMF effect. We thus a obtained a smaller upper limit on the neutrino mass, i.e. <1.3 eV(2{sigma}). We will also discuss the dependence on the power law spectral index of the PMF and on the vector CMB anisotropies.

• OSTI ID: 21143507
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1016; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANISOTROPY
COSMOLOGICAL MODELS
DOUBLE BETA DECAY
ELECTRIC FIELDS
LIMITING VALUES
MAGNETIC FIELDS
NEUTRINO OSCILLATION
NEUTRINOS
RELICT RADIATION
REST MASS