MG13 - Talk detail |
|
Participant |
Tobar, Michael | |||||||
|
Institution |
The University of Western Australia - 35 Stirling Hwy - Crawley - WA - Australia | |||||||
|
Session |
EG2 |
Accepted |
|
Order |
Time |
|||
|
Talk |
Oral abstract |
Title |
Testing for Periodic Changes in Fundamental Constants due to Gravity and Boost using Long Term Comparison of the SYRTE Cs Fountains and H-masers | |||||
| Co-authors | ||||||||
|
Abstract |
We analyze long-term data sets from three separate Cs Fountains1 compared to various Hydrogen Masers to search for periodic changes correlated with the changing gravitational potential and boost with respect to the Cosmic Microwave Background. Data sets begin at a Modified Julian Day of 52822 (July 2nd 2003) and continue to present. The main source of long-term noise in such experiments is the drift and frequency offsets associated with the various H-masers used in the comparison. For example, the drift can vary to nearly immeasurable to as high as 1.3×10-15 per day. To circumvent this problem we use the derivative technique as used previously for a comparison between a Cryogenic Sapphire Oscillator and a H-Maser. This technique significantly reduces the standard error when searching for periodic signals. Initial analysis finishes at November 2011, and gives a standard error of the LPI coefficient of 4.8x10^{-6}. To put bounds on Boost dependence we analyse both sidereal and annual variations, with sensitivity at the 10^{-11} level. |
|||||||
|
Session |
EG1 |
Accepted |
|
Order |
Time |
|||
|
Talk |
Oral abstract |
Title |
Testing Lorentz Invariance with Cryogenic Sapphire Oscillators | |||||
| Co-authors | ||||||||
|
Abstract |
Since the early 2000s we have been using cryogenic sapphire resonators to test Lorentz Invariance through Michelson-Morley and Kennedy Thorndike experiments. This has been done in collaboration with LNE-SYRTE at the Paris Observatory. A summary of this work will be given. Our current work involves a new version of a rotating Michelson-Morley experiment. This is now under way in collaboration with Humboldt University of Berlin, these experiment now can put limits on many different Lorentz violating components, including higher dimensional terms, which will be explained in this talk |
|||||||