r. frey student visit 1 gravitational waves, ligo, and uo gw physics ligo ligo@uo
Post on 22-Dec-2015
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R. Frey Student Visit 1
Gravitational Waves, LIGO, and UO
• GW Physics
• LIGO
• LIGO@UO
R. Frey Student Visit 2
Evidence for Gravitational Waves(indirect)
T=60 ms
T ~ 8 hr
PSR 1913+16 Binary n-star system
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 10-21 or 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
LivingstonObservatory
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 software and 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