Overview of LIGO Scientific Collaboration Inspiral Searches
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Overview of LIGO Scientific Collaboration Inspiral
Searches
Alexander Dietz
Louisiana State University
for the LIGO Scientific Collaboration
LIGO-G050632-00-Z
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Outline
1. Introduction, Overview
2. Details:I. Primordial black hole binaries (PBHB)
II. Binary Neutron Stars (BNS)
III. Binary Black Holes (BBH)
IV. Other searches
3. Outlook & Summary
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Our searches
BNS
PBH
Spin is important
“High mass ratio”Coming soon
1
3
100.1
Mass
Mass0.1 1 3
10
Inspiral-Burst S4
• Several inspiral searches are performed currently:– Primordial black holes
binaries (PBHB)– Binary Neutron Stars (BNS)– Binary Black Holes (BBH)
• Other searches in progress– Spinning Black Holes– Coincidences with GRB– Black Hole Ringdown– Inspiral-Burst
BBH
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The Science Runs
• Data from the latest science runs being analyzed:– Science Run 3 (S3):
31 Oct ‘03 to 09 Jan ‘04 – Science Run 4 (S4):
22 Feb ‘05 to 24 Mar ‘05
– GEO data included (for BNS only currently)
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Similarities and Differences
• Similarities of PBHB, BNS and BBH: Same pipeline Same code Same matched filter
techniques Same data segments
• Differences: Different templates Different vetoes Tuning done independent Different detection statistics
Basic search parameters (S3)
Search
Low
frequency cutoff
Length
in LIGO band
Number of templates
PBHB 100 Hz 7 s (0.7) 3000
BNS 70 Hz 6 s (1.4) 1000
BBH 70 Hz 0.3 s (5.0) 1200
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The pipeline
2nd Coincidence
The interferometers
Signal based veto
Coherent analysis
Follow up
Bank of templates
Matched filtering
See talk by Patrick Brady
Not for BBH
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Injections
Example of a hardware injection
• Two different types of injections performed
1. Software injections Determine the efficiency Test the pipeline
2. Hardware injections Validate software injections Check vetoes for safety
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Primordial black hole binaries
Hypothetical subsolar mass objects that contribute to the Dark Matter in galaxies
Component mass 0.35 - 1
Duration in LIGO band 7 s (0.7)
Number of templates 3000
Low freq. cutoff 100 Hz
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Binary Neutron Stars
Solar mass stellar remnants
Component mass 1 - 3
Duration in LIGO band 6 s (1.4)
Number of templates 1000
Low freq. cutoff 70 Hz
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Binary Neutron Stars
Effective distance after the coincidence step limited by the second best instrument
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Simulation of galaxy distribution
See poster by Ravi Kumar
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Binary Black Holes
21 ;;3/26/7 e)()1()(h ficut
BCVfffff
• Uses phenomenological templates (BCV) for matched filtering
• Software injections: model based waveforms:– Taylor, Pade, EOB
• χ2 test not yet available
Buoanno, Chen, Vallisneri, PRD 67, 2003
Use of phenomenological parameters
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Binary black holes
Stellar remnants
Component mass 3 - 40
Duration in LIGO band 0.3 s (5)
Number of templates 1200
Low freq. cutoff 70 Hz
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Binary Black Holes
Effective distance of L1 improved from 8 Mpc to
40 Mpc
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Other searches
• Spinning black holes – 17 Parameters– Computation intensive
• Coincidences with GRB – Short GRB possible from BNS– Location known, optimal oriented
• Black Hole Ringdown search• Inspiral-burst search• Online search during S5:
– BNS and BBH
See poster by Gareth Jones
See poster by Alexander Dietz
See poster by Lisa Goggin
See talk by Saikat Majumder
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Summary & Outlook
• Multiple searches underway• Searching a wide parameter space• Injections performed to test the pipeline and
determine the efficiency• Parameter tuning in progress
Future: Search extreme mass ratio inspirals Hierarchical Network analysis
More details on those searches: stay tuned…