1 gravitational lensing with neutrinos results, paper and public plots j.p. gómez-gonzález,...
TRANSCRIPT
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Gravitational lensing with neutrinosResults, paper and public plots
J.P. Gómez-González, S.Mangano, 21.2.2013
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Structure of the paper
1. Introduction 2. Gravitational Lensing of Photons and Neutrinos - One figure, eight equations3. ANTARES Detector and Neutrino Selection4. Potential Gravitational Lensed Neutrino Sources - One table, one figure5. Search for Neutrino Emission from Gravitational Lensed Sources - One table, one figure6. Summary
Referees: Véronique and Juande
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Details of analysis presented by Juan Pablo and explained in his thesis
Maximum likelihood search method:
Likelihood function is numerical maximised with respect to ns using TMinuit
A likelihood ratio is used as test statistics (λ):
Search method uses:1. event direction 2. number of hits in track fit 3. angular error estimate
Search method
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Large separation quasar SDSS J1004+4112 is lensed by a galaxy cluster (see first slide)
No signal: Best cluster
X-ray image from Chandra project
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P-value calculation for most significant event
Unblind => λobs
Compare λobs with λ distribution of only background case
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No significant excess of events (over expected background) at any of 11 selected directions => upper fluxes
Upper limits (public list)
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Enjoy movie: Einstein and Eddington (BBC 2008)
Comparison of two superposed photographs from sky:- Night sky in normal conditions- Sky with an solar eclipse => Light deflection by sun
Sun
Star
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Search for cosmic neutrino emission within gravitational lensing objects
No excess of events at any of 11 selected locations
Paper soon ready
Presentation of public plots
Conclusion