Gravitational WavesSupplement to Lecture XV

October 23, 2019

1

LIGO – Hanford Site (1 of 2)

2Caltech / MIT / LIGO Lab

3LIGO Scientific Collaboration (2014)

Advanced LIGOOptical Layout of the Interferometer

[Fabry-Perot Cavity]

4

5

6

GW 170817(LIGO + Virgo Collaborations 2017)

7

Sky localization

mT2/5µ3/5 =1.188

−0.002+0.004MSun

8

Gamma Ray BurstCoincident with GW Event

(LIGO, Virgo, Fermi-GBM, INTEGRAL Collaborations, 2017)

Multi-Wavelength Electromagnetic Observations of GW170817(Many Collaborations, 2017)

9Host galaxy is NGC 4993, z = 0.0097

H0 from 1 Gravitational Wave Source

10

Dire

ct m

easu

rem

ent

from

Cep

heid

s+ S

N Ia

Pred

ictio

n fr

om C

MB

+ L

CDM

Distance

–inclin

ation dege

neracy