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“Sterile” neutrinos are not sterile by virtue of their vacuum mixing with active neutrinos Gives effective interaction strength of the sterile neutrino.

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Presentation on theme: "“Sterile” neutrinos are not sterile by virtue of their vacuum mixing with active neutrinos Gives effective interaction strength of the sterile neutrino."— Presentation transcript:

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3 “Sterile” neutrinos are not sterile by virtue of their vacuum mixing with active neutrinos Gives effective interaction strength of the sterile neutrino relative to the Weak Interaction standard Weak Interaction It is by virtue of these tiny interactions that sterile neutrinos can be produced in the early universe or in supernovae

4 A heavy “sterile” neutrino can decay into a light “active” neutrino and a photon. The final state light neutrino and the photon equally share the rest mass energy of the initial heavy neutrino.

5 Sterile Neutrino Dark Matter ??? active-active neutrino scattering-induced decoherence S. Dodelson & L. M. Widrow, Phys. Rev. Lett. 72, 17 (1994) A. D. Dolgov & S. H. Hansen, Astropart. Phys. 16, 339 (2002) Largely eliminated by the X-ray observations But Some Models Are Still Viable... lepton number-enhanced decoherence low temperature inflaton Higgs decay M. Shaposhnikov & I. Tkachev, Phys. Lett. B 639, 414 (2006) A. Kusenko, Phys. Rev. Lett. 97, (2006) K. Petraki & A. Kusenko (2007), arXiv: X. Shi & G. M. Fuller, Phys. Rev. Lett. 83, 3120 (1999) K. Abazajian, G.M. Fuller, M. Patel, Phys. Rev. D 64, (2001) C. Kishimoto & G.M. Fuller, Phys. Rev. D 78, (2008) arXiv: K. Petraki (20008), arXiv:

6 J. Hidaka & G. M. Fuller, Phys. Rev. D 74, (2006)J. Hidaka & G. M. Fuller, Phys. Rev. D 76, (2007) Ohio State group

7 Fun with Compact Objects and ~ keV Rest Mass Sterile Neutrinos Pulsar “Kicks” A. Kusenko & G. Segre, PRD 59, (1999); G. M. Fuller, A. Kusenko, I. Mocioiu, and S. Pascoli PRD 68, (2003). Proto-neutron star “kick”-aided hydrodynamic supernova shock enhancement C. Fryer & A. Kusenko, Astrophys. J. (Suppl) 163, 335 (2006). Active-sterile-active neutrino matter-enhanced alteration of collapse physics and enhanced shock re-heating J. Hidaka & G. M. Fuller, Phys. Rev. D 74, (2006)

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20 DAMA/LIBRA Low Energy Spectrum

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23 CDMS Low Energy Spectrum

24 CDMS, DAMA/LIBRA Comparison

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