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Static Test for a Gravitational Force Coupled to Type 2 YBCO SuperconductorsAs a Bose condensate, superconductors provide novel conditions for revisiting previously proposed couplings between electromagnetism and gravity. Strong variations in Cooper pair density, large conductivity and low magnetic permeability define superconductive and degenerate condensates without the traditional density limits imposed by the Fermi energy (approx. 10(exp -6) g cc. Recent experiments have reported anomalous weight loss for a test mass suspended above a rotating type II, YBCO superconductor, with the percentage change (0.05 - 2.1 %) independent of the test mass' chemical composition and diamagnetic properties. A variation of 5 parts per 10' was reported above a stationary (non-rotating) superconductor. In experiments using a sensitive gravimeter, bulk YBCO superconductors were stably levitated in a DC magnetic field. Changes in acceleration were measured to be less than 2 parts in 108 of the normal gravitational acceleration. This result puts new limits on the strength and range of the proposed coupling between static superconductors and gravity.
Document ID
19990039542
Document Type
Reprint (Version printed in journal)
Authors
Li, Ning (NASA Marshall Space Flight Center Huntsville, AL United States)
Noever, David (Alabama Univ. Huntsville, AL United States)
Robertson, Tony (Alabama Univ. Huntsville, AL United States)
Koczor, Ron (Alabama Univ. Huntsville, AL United States)
Brantley, Whitt (Alabama Univ. Huntsville, AL United States)
Date Acquired
August 19, 2013
Publication Date
January 1, 1997
Publication Information
Publication: Physica C
Volume: 281
ISSN: 0921-4534
Subject Category
Physics (General)
Distribution Limits
Public
Copyright
Other