Presentation on theme: "Things that go bump in the sea T. Sloan (Lancaster University) Neutrino interactions (>10 20 eV) Axions (sadly Cotton-Mouton term) Primordial black holes."— Presentation transcript:
Things that go bump in the sea T. Sloan (Lancaster University) Neutrino interactions (>10 20 eV) Axions (sadly Cotton-Mouton term) Primordial black holes Any other unexpected phenomenon.
Expected pulse shapes Backgrounds give a train of osillations.
Limits from array using 4 fold coincidence of hydrophones (from Simon Bevan UCL Thesis)
Increase sensitivity - give up coincidence requirement Increases the solid angle coverage since showers detectable outside the plane of the array. More noise – ask for bigger pulses
Raw spectrum of peak amplitudes APPLY CUTS Final spectrum for 2 weeks of data. Analyse all 245 days of data selecting triggers with peak pressure above 0.4 Pa.
Examine all data (245 days) 81 events survive with peak pressure above 0.4 Pa. Each scanned visually to look for bipolar pulses. Most of them are multiple oscillations.
Conclusions 2 events (inverted probably background). No neutrinos (limit 5 orders of magnitude above W-B). Sensible limits need very large targets e.g. moon or polar ice cap (ANITA). No axions No primordial blackholes. No other unexpected phenomena.