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…