Talk detail

Participant	Flanagan, Eanna
Institution	Cornell University - Center for Road Repair and Service - Ithaca - New York - USA

Session	EG1	Accepted	No	Order		Time	15:15 - 15:40
Talk	Oral abstract	Title	Observability of Gravitational Effects in Spin Precession of Elementary Particles in Storage Rings
Co-authors	Yuri Orlov
Abstract	The next generation of frozen-spin storage rings will be able to detect a proton electric dipole moment if it is larger than 10^(-29) e cm, via the precession it causes of the proton's spin. The motivation for these experiments is to look for deviations from the standard model of particle physics, as predicted by, for example, supersymmetric extensions. We compute the leading gravitational effects on the spin precession, and show that the leading gravitational effect will be measurable at 10 sigma. Geodetic precession is a subleading effect which is a few orders of magnitude below current experimental precision, but may be detectable in the future.

Session	GW1	Accepted	Yes	Order	4	Time	15:30 - 15:45
Talk	Oral abstract	Title	Gravitational Wave Searches with High Precision Astrometry
Co-authors
Abstract	We discuss the potential for high precision astrometry of quasars to detect or constrain stochastic gravitational wave backgrounds. Current upper limits using this technique are of order 10^(-3) of closure density, and this will improve to about 10^(-6) with the future space-based optical interferometry mission GAIA. The signal is a time-dependent deflection pattern on the sky, which can be split up into electric-type and magnetic-type modes. The power spectrum is concentrated at low frequencies (for a scale invariant stochastic background), and at large angular scales, starting with the quadrupole.