LIGO-G030181-03-M Press Conference Scientific Operation of LIGO Gary H Sanders Caltech (on behalf of a large team) APS April Meeting Philadelphia 6-April-03.

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Presentation transcript:

LIGO-G M Press Conference Scientific Operation of LIGO Gary H Sanders Caltech (on behalf of a large team) APS April Meeting Philadelphia 6-April-03 "Colliding Black Holes" Credit: National Center for Supercomputing Applications (NCSA)

LIGO-G M 2 Direct Detection Detectors in space LISA Gravitational Wave Astrophysical Source Terrestrial detectors LIGO, GEO, TAMA, Virgo

LIGO-G M 3 International network (LIGO, Virgo, GEO, TAMA) of suspended mass Michelson-type interferometers on earth’s surface detect distant astrophysical sources Terrestrial Interferometers suspended test masses free masses

LIGO-G M 4 An International Network of Interferometers LIGO Simultaneously detect signal (within msec) detection confidence locate the sources decompose the polarization of gravitational waves GEO Virgo TAMA AIGO

LIGO-G M 5 LIGO Livingston Observatory

LIGO-G M 6 LIGO Hanford Observatory

LIGO-G M 7 GEO 600

LIGO-G M 8 LIGO Sensitivity Livingston 4km Interferometer May 2001 Jan 2003

LIGO-G M 9 Astrophysical Sources of Gravitational Waves Compact binary inspiral: “chirps” »NS-NS waveforms are well described »BH-BH need better waveforms »search technique: matched templates Supernovae / GRBs: “bursts” »burst signals in coincidence with signals in electromagnetic radiation »Challenge to search for untriggered bursts Pulsars in our galaxy: “periodic signals” »search for observed neutron stars (frequency, doppler shift) »all sky search (computing challenge) »r-modes Cosmological Signals “stochastic background”

LIGO-G M 10 Inspiral Upper Limit Template based search 1 to 3 solar mass neutron stars Hanford 4 km + Livingston 4 km Sensitivity in Milky Way, LMC, SMC Result: R < 164 / yr / MilkyWayEquiv.Galaxy (90% confidence level)

LIGO-G M 11 Advanced LIGO Enhanced Systems laser suspension seismic isolation test mass Improvement factor in rate ~ narrow band optical configuration

LIGO-G M 12 Conclusions l LIGO commissioning is well underway »Good progress toward design sensitivity (Raab) l Science Running is beginning »Initial results from our first LIGO data run (Katsavounidis) »The sources (Creighton) »Talks this afternoon (Brady, Daw, Papa and Romano) l Our Plan »Improved data run is underway »Our goal is to obtain one year of integrated data at design sensitivity before the end of 2006 »Advanced interferometer with dramatically improved sensitivity – (Rowan) l LIGO should be detecting gravitational waves within the next decade !