dorsal/arxiv
View SchemaTest of Cosmic Spatial Isotropy for Polarized Electrons Using a Rotatable Torsion Balance
| Authors | Li-Shing Hou, Wei-Tou Ni, Yu-Chu M. Li |
|---|---|
| Categories | |
| ArXiv ID | physics/0009012 |
| URL | https://arxiv.org/abs/physics/0009012 |
| DOI | 10.1103/PhysRevLett.90.201101 |
| Journal | Phys.Rev.Lett.90:201101,2003 |
Abstract
To test the cosmic spatial isotropy, we use a rotatable torsion balance carrying a transversely spin-polarized ferrimagnetic Dy_{6}Fe_{23} mass. With a rotation period of one hour, the period of anisotropy signal is reduced from one sidereal day by about 24 times, and hence the 1/f noise is greatly reduced. Our present experimental results constrain the cosmic anisotropy Hamiltonian H = C_{1} sigma_{1} + C_{2} sigma_{2} + C_{3} sigma_{3} (sigma_{3} is in the axis of earth rotation) to (C_{1}^{2} +C_{2}^{2})^{1/2} = (1.8 +- 5.3) X 10^{-21} eV and | C_{3} | = (1.2 +- 3.5) X 10^{-19} eV. This improves the previous limits on (C_{1},C_{2}) by 120 times and C_{3} by a factor of 800.
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"abstract": "To test the cosmic spatial isotropy, we use a rotatable torsion balance\ncarrying a transversely spin-polarized ferrimagnetic Dy_{6}Fe_{23} mass. With a\nrotation period of one hour, the period of anisotropy signal is reduced from\none sidereal day by about 24 times, and hence the 1/f noise is greatly reduced.\nOur present experimental results constrain the cosmic anisotropy Hamiltonian H\n= C_{1} sigma_{1} + C_{2} sigma_{2} + C_{3} sigma_{3} (sigma_{3} is in the axis\nof earth rotation) to (C_{1}^{2} +C_{2}^{2})^{1/2} = (1.8 +- 5.3) X 10^{-21} eV\nand | C_{3} | = (1.2 +- 3.5) X 10^{-19} eV. This improves the previous limits\non (C_{1},C_{2}) by 120 times and C_{3} by a factor of 800.",
"arxiv_id": "physics/0009012",
"authors": [
"Li-Shing Hou",
"Wei-Tou Ni",
"Yu-Chu M. Li"
],
"categories": [
"physics.space-ph"
],
"doi": "10.1103/PhysRevLett.90.201101",
"journal_ref": "Phys.Rev.Lett.90:201101,2003",
"title": "Test of Cosmic Spatial Isotropy for Polarized Electrons Using a Rotatable Torsion Balance",
"url": "https://arxiv.org/abs/physics/0009012"
},
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