(Anti-)matter Waves For Researching Time, Mass, And Gravity
- 00:55:30
Description |
|---|
|
What is time? We have built a clock that measures time based on the oscillation frequency mc^2/h of a particle's matter wave. The clock shows that time is physical as long as the universe has massive particles. It is based on a light-pulse atom interferometer which is self-referenced by stabilizing the frequency of the light pulses to the interferometer's interference fringes via a frequency comb generator. Used the other way around, the clock offers a new way of defining the unit of mass, replacing the last unit that is still defined by an artifact with a definition based on the fundamental constants c and h. Matter waves have also been used to test the theory of General Relativity, comprehensively ruling out violations of the equivalence principle with high precision. In the future, we hope to perform such experiments with antiparticles, measuring the gravitational influence on antimatter. As a speculation, maybe clocks can be made of an even stranger creature: the quantum vacuum. |
Details |
|
|---|---|
Title |
(Anti-)matter Waves For Researching Time, Mass, And Gravity |
Creator |
University of California, Berkeley. Dept. of Physics |
Published |
Berkeley, CA, University of California, Berkeley, Dept. of Physics, October 28, 2013 |
Full Collection Name |
Physics Colloquia |
Type |
Video |
Format |
Lecture. |
Extent |
1 streaming video file |
Other Physical Details |
digital, sd., col. |
Archive |
Physics Library |
Note |
Recorded at a colloquium held on October 28, 2013, sponsored by the Dept. of Physics, University of California, Berkeley. originally produced as an .mts file in 2013 Speakers: Mueller, Holger. |
Usage Statement |
Researchers may make free and open use of the UC Berkeley Library’s digitized public domain materials. However, some materials in our online collections may be protected by U.S. copyright law (Title 17, U.S.C.). Use or reproduction of materials protected by copyright beyond that allowed by fair use (Title 17, U.S.C. § 107) requires permission from the copyright owners. The use or reproduction of some materials may also be restricted by terms of University of California gift or purchase agreements, privacy and publicity rights, or trademark law. Responsibility for determining rights status and permissibility of any use or reproduction rests exclusively with the researcher. To learn more or make inquiries, please see our permissions policies (https://www.lib.berkeley.edu/about/permissions-policies). |
Collection |
Physics Colloquia |
Tracks |
colloquia/10-28-13Muller.mp4 00:55:30 |
Linked Resources |
|