Test of Cosmic Spatial Isotropy for Polarized Electrons Using a Rotatable Torsion Balance
Abstract
To test the cosmic spatial isotropy, we use a rotatable torsion balance carrying a transversely spin-polarized ferrimagnetic Dy6Fe23 mass. With a rotation period of 1h, the period of anisotropy signal is reduced from one sidereal day by about 24times, and hence the 1/f noise is reduced. Our present experimental results constrain the cosmic anisotropy Hamiltonian H=C1σ1+C2σ2+C3σ3 (σ3 is in the axis of earth rotation) to (C21+C22)1/2=(1.1±2.0)×10-20 eV and |C3|=(1.1±6.0)×10-19 eV. This improves the previous limits on (C21+C22)1/2 by 27times.
- Publication:
-
Physical Review Letters
- Pub Date:
- May 2003
- DOI:
- 10.1103/PhysRevLett.90.201101
- arXiv:
- arXiv:physics/0009012
- Bibcode:
- 2003PhRvL..90t1101H
- Keywords:
-
- 04.80.Cc;
- 11.30.Cp;
- 11.30.Er;
- 98.80.Es;
- Experimental tests of gravitational theories;
- Lorentz and Poincare invariance;
- Charge conjugation parity time reversal and other discrete symmetries;
- Observational cosmology;
- Physics - Space Physics
- E-Print:
- 6 pages, 3 figures