







This Week at Physics 

<< Spring 2014  Fall 2014  Spring 2015 >> 
Subscribe to receive email announcements of events 
Events on Friday, September 26th, 2014
 Physics Department Colloquium
 Hunting for topological dark matter with atomic clocks
 Time: 3:30 pm
 Place: Chamberin
 Speaker: Andrei Derevianko, University of Nevada, Reno
 Abstract: Atomic clocks are arguably the most accurate scientific instruments ever build. Modern clocks are astonishing timepieces guaranteed to keep time within a second over the age of the Universe. Attaining this accuracy requires that the quantum oscillator be well protected from environmental noise and perturbations well controlled and characterized. This opens intriguing prospects of using clocks to study subtle effects, and it is natural to ask if such accuracy can be harnessed for dark matter searches.
The cosmological applications of atomic clocks so far have been limited to searches of the uniformintime drift of fundamental constants. We point out that a transient in time change of fundamental constants can be induced by dark matter objects that have large spatial extent, and are built from light nonStandard Model fields. The stability of this type of dark matter can be dictated by the topological reasons. We point out that correlated networks of atomic clocks, such as atomic clocks onboard satellites of the GPS constellation, can be used as a powerful tool to search for the topological defect dark matter. In other words, one could envision using GPS as a 50,000 kmaperture topological darkmatter detector.  Host: Saffman
 Poster: http://www.physics.wisc.edu/twap/posters/2014/3381.pdf
 Add this event to your calendar