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SUMMARY:Scott Lecture II - The Cosmic Barber: Counting Gravitational Hair 
 in the Solar System and Beyond - Professor Clifford Will\, Distinguished P
 rofessor of Physics\, University of Florida
DTSTART:20151028T160000Z
DTEND:20151028T170000Z
UID:TALK60513@talks.cam.ac.uk
CONTACT:Leona Hope-Coles
DESCRIPTION:According to general relativity\, every self-gravitating objec
 t has "hair"\, an array of multipole moments of various types that charact
 erize the body's exterior geometry. In alternative theories of gravity\, b
 odies could also be endowed with more exotic tresses\, such as scalar hair
 . We review how solar system experiments\, such as light deflection and ti
 me-delay measurements\, have placed stringent limits on scalar hair. We de
 scribe how experiments such as GRACE have measured with high precision the
  vast head of Newtonian hair possessed by the Earth. We discuss how the an
 gular-momentum hair of the Earth has been measured by Gravity Probe B and 
 the LAGEOS project. At the relativistic extreme\, black holes are almost b
 ald\, possessing only two strands of general relativistic hair\, and we de
 scribe ways of counting those follicles in the future\, by tracking stars 
 orbiting very close to our galactic center black hole\, and by using gravi
 tational waves to measure how newly formed black holes shed their unruly h
 air.
LOCATION:Pippard Lecture Theatre\, Cavendish Laboratory\, Department of Ph
 ysics
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