Ralf Lehnert
(UNAM)
11/10/2010, 14:30
Searches for symmetry violations
Oral
An important open question in fundamental physics concerns the nature of spacetime at distance scales associated with the Planck length. The widespread belief that probing such distances necessitates Planck-energy particles has impeded phenomenological and experimental research in this context. However, it has been realized that various theoretical approaches to underlying physics can...
Michael Romalis
(Princeton University)
11/10/2010, 15:00
Searches for symmetry violations
Oral
Violation of Lorentz symmetry arises in many extensions of the
Standard Model aiming to include quantum gravity. Violation of CPT
symmetry also necessarily leads to breaking of Lorentz symmetry,
allowing CPT tests without the use of anti-particles. Spin coupling
to a preferred frame naturally arises in many such models.
We use a K-$^3$He co-magnetometer to constrain neutron spin...
Prof.
Werner Heil
(Institute of Physics)
11/10/2010, 15:30
Oral
Accurate frequency measurements currently give the strongest bounds on the validity of fundamental theories. We present new results from a 3He/129Xe clock-comparison experiment, where the free precession of the nuclear spins is used to probe Einsteins principle of relativity. In particular, the sidereal variation of the 3He/129Xe frequency induced by Lorentz-violating couplings is measured,...
Dr
Seth Hoedl
(University of Washington)
11/10/2010, 15:50
Searches for new forces
Oral
Despite two decades of experimental effort, the elusive axion has yet
to be found. Nevertheless, for possible axion masses between
10~$\mu$eV and 10~meV, it remains a well motivated solution to the
strong CP problem, and a promising dark matter candidate. Current
searches use the axion-two-photon coupling to probe for
axions that could be generated in the sun, remnants from the big-bang...
