Primordial Nucleosynthesis, Additional Neutrinos and Neutral Currents from the Superstring

Ellis, John R.; Enqvist, K.; Nanopoulos, Dimitri V.; Sarkar, Subir

doi:10.1016/0370-2693(86)91301-8

Primordial Nucleosynthesis, Additional Neutrinos and Neutral Currents from the Superstring

John R. Ellis
(
- CERN
)
,
K. Enqvist
(
- CERN
)
,
Dimitri V. Nanopoulos
(
- CERN
)
,
Subir Sarkar
(
- Oxford U. and
- Rutherford
)

Nov, 1985

7 pages

Published in:

Phys.Lett.B 167 (1986) 457

Published: 1986

DOI:

10.1016/0370-2693(86)91301-8

Report number:

CERN-TH-4303/85

View in:

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Abstract: (Elsevier)

The constraint on the number of neutrino species N v imposed by Big Bang nucleosynthesis is reviewed critically. It is argued that uncertainites in the neutron lifetime, systematic errors in the measurement of 4 He abundance, and new astrophysical data on 3 He which suggest extensive astration of D, permit N v = 5 or even 6. Some phenomenological models based on the superstring expect three additional right-handed neutrinos of low mass which are weakly coupled to ordinary matter through a new heavy Z′ gauge boson. Their compatibility with the relaxed nucleosynthesis limits quoted above imposes an interesting lower limit on m Z ′ . As a byproduct of our analysis, we present the corrections to low energy v μ e scattering due to Z′ exchange.

ASTROPHYSICS: CRITICAL PHENOMENA
THERMODYNAMICS
MODEL: STRING
SUPERSYMMETRY
NEUTRINO: MASS
MASS: NEUTRINO
GAUGE BOSON: MASS
MASS: GAUGE BOSON
LOWER LIMIT
NEUTRINO ELECTRON: ELASTIC SCATTERING

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