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Gravitational Waves, LIGO, and UO

Gravitational Waves, LIGO, and UO. GW Physics LIGO LIGO@UO. Evidence for Gravitational Waves (indirect). PSR 1913+16 Binary n-star system. T=60 ms. ·. ·. T ~ 8 hr. Pulsar period observed over 25 years – Taylor and Hulse. GW Science. Goals:

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Gravitational Waves, LIGO, and UO

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  1. Gravitational Waves, LIGO, and UO • GW Physics • LIGO • LIGO@UO R. Frey Student Visit

  2. Evidence for Gravitational Waves(indirect) PSR 1913+16 Binary n-star system T=60 ms · · T ~ 8 hr Pulsar period observed over 25 years – Taylor and Hulse R. Frey Student Visit

  3. GW Science • Goals: • Establish GW detection – test General Relativity • Use GW as an astrophysical tool • Unexplored territory! • GW revolution like radio astronomy? R. Frey Student Visit

  4. GW Sources • GW emission requires time varying quadrupole moment of mass distribution • Strain estimate: Note: Virgo cluster is at r  15 Mpc R. Frey Student Visit

  5. GW Interferometer Principle Require: L/ L = h  10-21or better R. Frey Student Visit

  6. R. Frey Student Visit

  7. Inspiral sensitivity • Bb R. Frey Student Visit

  8. Astrophysical signal types • Compact binary inspiral: “chirps” • NS-NS waveforms are well described • BH-BH need better waveforms • search technique: matched templates • Supernovae / GRBs: “bursts” • “unmodelled” search • triggered search: coincidence with photon or neutrino detections • Pulsars in our galaxy: “periodic” • observe known neutron stars (frequency, doppler shift) • all sky search (computing challenge) • r-modes • Cosmological Signals “stochastic background” R. Frey Student Visit

  9. Gamma Ray Bursts GRB030329 HETE-2 gamma-ray lightcurve Source: GSFC 2005: SWIFT – 3 GRBs/week with redshift measurements ! R. Frey Student Visit

  10. Laser Interferometer Gravitational-wave Observatory (LIGO) Hanford Observatory Livingston Observatory R. Frey Student Visit

  11. Vacuum equipment – corner station R. Frey Student Visit

  12. Science Running Hanford control room R. Frey Student Visit

  13. LIGO @ UO • Noise identification and mitigation: Instrumentation and analysis • Environmental noise: seismic, wind, magnetic, cosmic rays, RF, artillery, acoustic • Online noise detection softwareand analysis • Intersite correlations • Gravitational Wave searches • GWs in coincidence with Gamma-ray bursts • Multi-event analysis (I. Leonor) • “Bouncing” GRBs (R. Rahkola thesis project) • GWs produced by core-collapse supernovae (M. Ito thesis project) R. Frey Student Visit

  14. LIGO @ UO • Graduate Students • Masahiro Ito • Rauha Rahkola • Emelie Harstad • PhD Scientists • Isabel Leonor • Robert Schofield • Faculty • Brau • Frey • Strom • Prospects: • LIGO very near design sensitivity for initial searches • Long science run(s) upcoming • First GW detection ? • New field of GW astrophysics ? • Advanced LIGO upgrades, >2009 • 10 better sensitivity R. Frey Student Visit

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