Increasing the effective number of neutrinos with decaying particles

Kazuhide Ichikawa; Masahiro Kawasaki; Kazunori Nakayama; Masato Senami; Fuminobu Takahashi

doi:10.1063/1.2823816

Increasing the effective number of neutrinos with decaying particles

Kazuhide Ichikawa, Masahiro Kawasaki, Kazunori Nakayama, Masato Senami, Fuminobu Takahashi

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

We present a model of decaying particles to increase the effective number of neutrinos N_V after big bang nucleosynthesis but before the structure formation begins. We point out that our scenario solves the discrepancy between the constraints on N_V from these two epochs, As an example, we consider saxion decay into two axions.

Original language	English
Title of host publication	Particles, Strings, and Cosmology - 13th International Symposium on Particles, Strings, and Cosmology, PASCOS 2007
Pages	413-416
Number of pages	4
DOIs	https://doi.org/10.1063/1.2823816
Publication status	Published - 2007 Dec 1
Externally published	Yes
Event	13th International Symposium on Particles, Strings and Cosmology, PASCOS 2007 - London, United Kingdom Duration: 2007 Jul 2 → 2007 Jul 7

Publication series

Name	AIP Conference Proceedings
Volume	957
ISSN (Print)	0094-243X
ISSN (Electronic)	1551-7616

Other

Other	13th International Symposium on Particles, Strings and Cosmology, PASCOS 2007
Country/Territory	United Kingdom
City	London
Period	07/7/2 → 07/7/7

Keywords

Axions
Cosmological neutrinos
Cosmologies of theories beyond the standard model

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.1063/1.2823816

Cite this

Increasing the effective number of neutrinos with decaying particles. / Ichikawa, Kazuhide; Kawasaki, Masahiro; Nakayama, Kazunori et al.
Particles, Strings, and Cosmology - 13th International Symposium on Particles, Strings, and Cosmology, PASCOS 2007. 2007. p. 413-416 (AIP Conference Proceedings; Vol. 957).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Ichikawa, K, Kawasaki, M, Nakayama, K, Senami, M & Takahashi, F 2007, Increasing the effective number of neutrinos with decaying particles. in Particles, Strings, and Cosmology - 13th International Symposium on Particles, Strings, and Cosmology, PASCOS 2007. AIP Conference Proceedings, vol. 957, pp. 413-416, 13th International Symposium on Particles, Strings and Cosmology, PASCOS 2007, London, United Kingdom, 07/7/2. https://doi.org/10.1063/1.2823816

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AU - Takahashi, Fuminobu

PY - 2007/12/1

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AB - We present a model of decaying particles to increase the effective number of neutrinos NV after big bang nucleosynthesis but before the structure formation begins. We point out that our scenario solves the discrepancy between the constraints on NV from these two epochs, As an example, we consider saxion decay into two axions.

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KW - Cosmologies of theories beyond the standard model

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BT - Particles, Strings, and Cosmology - 13th International Symposium on Particles, Strings, and Cosmology, PASCOS 2007

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Increasing the effective number of neutrinos with decaying particles

Abstract

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Keywords

ASJC Scopus subject areas

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