Speaker
Michael Romalis
(Princeton University)
Description
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 coupling
to a Lorentz and CPT violating background field, $|b_n|<3.7 10^{-33}$ GeV, improving
previous limit by a factor of 30. I will also discuss future prospects for improving
these limits by using $^21$Ne atoms and placing the experiment on
the South Pole to eliminate the systematic effect due to Earth's
rotation.
Primary author
Michael Romalis
(Princeton University)
