Gravitational Wave Data Analysiscaoj/teaching/doc/jcao_s_gw1.pdf · Gravitational Waves...
Transcript of Gravitational Wave Data Analysiscaoj/teaching/doc/jcao_s_gw1.pdf · Gravitational Waves...
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Gravitational Wave Data Analysis
GW detectorsSignal processing: preparationNoise spectral densityMatched filteringProbability and statisticsSoftware implementation
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Gravitational Wave Data Analysis
Gravitational Wave Detectors
Junwei Cao (曹军威) and Junwei Li (李俊伟)Tsinghua University
Gravitational Wave Summer School Kunming, China, July 2009
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Gravitational Waves
Gravitational waves are prediction of Einstein’s General Theory of Relativity.No direct detection of GWsis successful for nearly 100 years.A new window to observe the universe
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Strength of GWs
For the binary system shown in the figure, the strain h=2δl/lbecomes h~R1R2/DdFor neutron stars of 1.4M⊙out at Virgo cluster (15Mpc): h~10-21
Crazy but within current reach!
Binary: a typical GW source
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Frequency Ranges
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Laser Interferometers
The Michelson interferometer measures phase differences between two returning beams recombined at the beam splitter. (Albert A. Michelson, 1852-1931, Nobel Prize 1907)Modern interferometers use lasers
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GW Laser Detectors
LIGO
Simultaneously detect signal (within msec)
GEO VirgoTAMA
AIGO
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GW Laser Detectors (Contd.)
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LIGO: Laser Interferometer Gravitational wave Observatory (激光干涉引力波天文台)U.S. NSF flagship project with largest single investment; a joint effort of Caltech and MITLSC: the LIGO Scientific Collaboration over 500 scientists from over 60 institutes worldwide
LIGO Hanford Observatory (H1, H2) LIGO Livingston Observatory (L1)
LIGO & LSC
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LIGO Experiences
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LIGO Status
LIGO deliverable – S5 run with over 1 year triple coincidence, no gold-plated detectionEnhanced LIGO – 2 times sensitivity improvement, S6 starts in July 2009Advanced LIGO – 10 times sensitivity improvement, 103 times signals and frequent GW detections are expected
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Struggle Against Noises
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LIGO Data
Data are comprised of:Gravitational Wave channel (AS_Q)Physical Environment MonitorsInternal Engineering Monitors
Multiple data products beyond raw data
RDS_R_L1, including both GW and environmental channelsRDS_R_L3, including only AS_Q channel
L-RDS_R_L3-751658016-16.gwf
Site (H,L) Data Type
GPS Start Time
Duration
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GW Data Analysis
Burst, Inspiral, Stochastic, ContinuousSignal processing, probability, statistical analysisOnline, offline, real-timeMatlab, DMT(C++), Scripts (Python)Clusters, grids, …