Probing the Universe with Gravitational Waves R.Weiss, MIT on - - PowerPoint PPT Presentation

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Probing the Universe with Gravitational Waves R.Weiss, MIT on - - PowerPoint PPT Presentation

Jun 18, 2023 367 likes •898 views

Probing the Universe with Gravitational Waves R.Weiss, MIT on behalf of the LIGO Scientific Collaboration International Congress on Mathematical Physics Montreal, Canada, July 23, 2018 Gravitational waves Einstein 1916 and 1918 Sources:

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Probing the Universe with Gravitational Waves

R.Weiss, MIT on behalf of the LIGO Scientific Collaboration International Congress on Mathematical Physics Montreal, Canada, July 23, 2018

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Gravitational waves

Einstein 1916 and 1918

– Sources: non-spherically symmetric accelerated masses – Kinematics:

  • propagate at speed of light
  • transverse waves, strains in space (tension and compression)
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Gravitational waves

Einstein 1916 and 1918

– Sources: non-spherically symmetric accelerated masses – Kinematics:

  • propagate at speed of light
  • transverse waves, strains in space (tension and compression)
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The measurement challenge

Kip Thorne

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Evolution of the initial detector 2001 - 2006

A clean non-detection

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Advanced LIGO design noise budget

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After Feb 11, 2016

Matt Weber

“Was that you I heard just now,

  • r was it two black holes colliding

New Yorker Feb 12,, 2016

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Results of O1 and O2 run announced June 1, 2017

m1=36, m2= 29, Δm=3 m1=23, m2= 13, Δm=1.5 m1=14.2, m2= 7.5, Δm=1 if at 1 au h ~10-6 Ig~ 1025 w/m2 m1=31, m2= 19, Δm=2 masses in source frame

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Localization on sky and distance

Triple coincidence GW 170814

M1 = 30 M2 = 25 ΔM = 2.7

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NGC4493

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Origin of the elements

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Hubble constant measurement: Galaxy z and distance from GW amplitude

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Localization with more detectors

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age of universe years hours minutes 1/10 to 1/1000 sec

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LIGO Scientific Collaboration

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Extra slides

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Michelson Interferometer Schematic and GW sidebands

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spectrum phasors modulation amplitude phase waveforms

MODULATION: Amplitude and Phase

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Neutron Star Tidal Distortion

tidal distortion high spin low spin

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Binary neutron star spectroscopy

S.Bose,K.Chakravarti, L.Rezzolla, B.S. Sathyaprakash, K. Takami

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E.Oelker, T. Isogai, J.Miller, M.Tse, L.Barsotti,N.Mavalvala,M.Evans

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LISA Pathfinder

Launched 12/03/2015 At L1, masses released Passed acceleration tests Next, thruster tests

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Credit: LIGO/ Caltech/ Sonoma State (Simonnet)

“Solar Mass” Black Holes