Document Detail

Signatures of a hidden cosmic microwave background.
MedLine Citation:
PMID:  18851438     Owner:  NLM     Status:  PubMed-not-MEDLINE    
If there is a light Abelian gauge boson gamma' in the hidden sector its kinetic mixing with the photon can produce a hidden cosmic microwave background (HCMB). For meV masses, resonant oscillations gamma<-->gamma' happen after big bang nucleosynthesis (BBN) but before CMB decoupling, increasing the effective number of neutrinos Nnu(eff) and the baryon to photon ratio, and distorting the CMB blackbody spectrum. The agreement between BBN and CMB data provides new constraints. However, including Lyman-alpha data, Nnu(eff) > 3 is preferred. It is tempting to attribute this effect to the HCMB. The interesting parameter range will be tested in upcoming laboratory experiments.
Joerg Jaeckel; Javier Redondo; Andreas Ringwald
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Publication Detail:
Type:  Journal Article     Date:  2008-09-26
Journal Detail:
Title:  Physical review letters     Volume:  101     ISSN:  0031-9007     ISO Abbreviation:  Phys. Rev. Lett.     Publication Date:  2008 Sep 
Date Detail:
Created Date:  2008-10-14     Completed Date:  2008-11-04     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0401141     Medline TA:  Phys Rev Lett     Country:  United States    
Other Details:
Languages:  eng     Pagination:  131801     Citation Subset:  -    
Institute for Particle Physics and Phenomenology, Durham University, Durham DH1 3LE, United Kingdom.
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