Loading in 2 Seconds...
Loading in 2 Seconds...
Perspectives in the experimental exploration of gravitational physics in superconductors. Pavol VALKO Slovak Technical University Il kovi čova 3, 812 19 Bratislava. Basic motivation. - our homes reside in the Universe - but we can see only 4 % of our home
Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.
Slovak Technical University Ilkovičova 3, 812 19 Bratislava
- our homes reside in the Universe
- but we can see only 4 % of our home
- we also believe there is some 23 % of dark matter hidden somewhere bellow our roof
- and we were told there is 73 % of dark energy hanging around
- therefore we would like to
Gravitation is the weakest (known) force.
Weak forces produce weak effects.
BEarth 4 × 10−14rad/s
Weak effects could be tested either with large sensors (to gain required sensitivity) or with very fine tools.
LAGEOS, Gravity Probe B
Superconducting based tools are very, very fine , while passive superconducting samples could be made also really large.
DC SQUID noise level ~2.10-31 J/Hz
Naturally low temperature operation required for any low noise (i.e. small signal) measurements.
- precision London moment experiments
- to check Tate's, Cabrera result
- torsion balance experiments
- test of "ordinary" gravity between superconductors
- lifetime of radioactive superconductors nuclei
- Tao balls and similar "exotic" measurements
- quantum interference caused by gravity related effects
J. Tate, S. B. Felch, B. Cabrera: Phys. Rev. B, 42 (1990) 7885
- was a milestone experiment in relativity (gravity) related tests in superconductors
- result can't be interpreted in standard physics framework
- result is at the edge of acceptable precision (~4.5 )
- only one superconducting material was used (niobium)
- never repeated by any other group
- use of different and new superconductors
- more sensitive experimental set-up and sensors
fast and multi stage SQUID's
Adelberger et al.
- precise lifetime measurements of radioactive superconductors
- Tao et al., Phys. Rev. Lett. 83 (1999) 5575
- limited by optical observation
- quantum interference gravitational effect
- never attempted, new kind of experiments
- there is no doubt that:
- future experiments could significantly improve understanding of gravity related effects using superconducting experimental tools
- there is a real possibility:
- there is a fair chance: