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Astron. Astrophys. 363, 825-836 (2000)


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On the detection of neutrino oscillations with Planck surveyor

L. Popa 1,2, C. Burigana 2, F. Finelli 2,3 and N. Mandolesi 2

1 Institute of Space Sciences, 76900 Bucharest-Magurele, Romania
2 Istituto TeSRE, Consiglio Nazionale delle Ricerche, Via Gobetti 101, 40129 Bologna, Italy
3 University of Bologna and INFN, Via Irnerio 46, 40126 Bologna, Italy

Received 6 March 2000 / Accepted 28 September 2000

Abstract

The imprint of neutrino oscillations on the Cosmic Microwave Background (CMB) anisotropy and polarization power spectra is evaluated in a [FORMULA]CHDM model with two active neutrino flavors, consistent with the structure formation models and the atmospheric neutrino oscillations data.

By using the Fisher information matrix method we find that the neutrino oscillations could be detected by PLANCK surveyor if the present value of the lepton asymmetry [FORMULA], the difference of the neutrino squared masses [FORMULA]eV2 and the vacuum mixing angle [FORMULA], showing the existence of a significant overlap between the region of the oscillation parameter space that can be measured by PLANCK surveyor and that implied by the atmospheric neutrino oscillations data.

Key words: cosmology: cosmic microwave background – cosmology: dark matter – cosmology: large-scale structure of Universe – elementary particles

Present address: Purdue University, Physics Department, West Lafayette, IN 47907-1396, USA

Send offprint requests to: lpopa@venus.nipne.ro or popa@tesre.bo.cnr.it

© European Southern Observatory (ESO) 2000

Online publication: December 5, 2000

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