Neutrinos as Probes: Solar-, Geo-, Supernova neutrinos; Laguna
Big World of Small Neutrinos
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Big World of Small NeutrinosBig World of Small Neutrinos
Roman ShcherbakovRoman Shcherbakov21, March, 200721, March, 2007
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3 Nobel prizes3 Nobel prizes
1988 1988 LEDERMAN,LEDERMAN, SCHWARTZ and JACKSCHWARTZ and JACK STEINSTEINBERGBERGERER – – detected muon neutrinosdetected muon neutrinos
1995 REINES – detected reactor neutrinos in 19561995 REINES – detected reactor neutrinos in 1956 2002 2002 RAYMOND andRAYMOND and KOSHIBAKOSHIBA – detected solar neutrinos – detected solar neutrinos
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Neutrino opticsNeutrino optics
NS
in the Neutron Star
in the Earth
in the Sun
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Neutrino oscillationsNeutrino oscillations
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Neutrino oscillationsNeutrino oscillations
Hierarchy is not yet known
Mixing matrix
=>different neutrino & antineutrino
For E=10MeV L12~300km L13~10km
Only 1/3 of born electron neutrino stay electron neutrino
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Solar neutrinosSolar neutrinos> 50 trillion solar neutrinos pass through the human body every second
it would take approximately one light year of lead to block half of them
butbut
400kEv
10MEv
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Qen e p:decayβAtomrecoil
In the nucleus
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B-decay energy spectrumB-decay energy spectrum8
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MSW effectMSW effect
Oscillations enforced by scattering
•Not important for the Sun
•Considered in detailed calculations of supernova explosions
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Supernova 1987aSupernova 1987a
51kpc away
24 neutrinos
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Supernova explosion (type II)Supernova explosion (type II)
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Theoretical neutrino spectrumTheoretical neutrino spectrum
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Total neutrinoTotal neutrinobackground luminositybackground luminosity
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Cosmic neutrino background (CNB)Cosmic neutrino background (CNB)Similar to CMB
Undetectable by any means
Bad dark matter candidate – relativistic in the time of recombination
Cold dark matter is favorable for structure formation
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Cuspy halos are not cuspyCuspy halos are not cuspy
2 solutions
• Large annihilation cross-section of cold dark matter (KKT model)
• Warm dark matter
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Cold dark matter annihilationCold dark matter annihilation
Doesn’twork
Only decay tosterile particlesIs possible
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ConclusionsConclusions
Neutrinos provide a new great tool for:Neutrinos provide a new great tool for: probing the interior of the Sunprobing the interior of the Sun observing the early stages of supernovae observing the early stages of supernovae proving particle theoriesproving particle theories
☺☺☺☺☻☻☻☻