Bulletin of the American Physical Society
APS April Meeting 2017
Volume 62, Number 1
Saturday–Tuesday, January 28–31, 2017; Washington, DC
Session B8: Ultralight Dark MatterInvited
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Sponsoring Units: GPMFC Chair: Marianna Safronova, University of Delaware Room: Delaware B |
Saturday, January 28, 2017 10:45AM - 11:21AM |
B8.00001: Searching for ultralight dark matter with atomic spectroscopy and magnetic resonance Invited Speaker: Dmitry Budker |
Saturday, January 28, 2017 11:21AM - 11:57AM |
B8.00002: The axion dark matter search at CAPP: a comprehensive approach. Invited Speaker: Yannis Semertzidis Axions are the result of a dynamic field, similar to Higgs field, invented to solve the so-called Strong CP-problem, i.e., why the electric dipole moment (EDM) of the neutron and proton has not been observed so far even though the theory of QCD predicts values by about ten order of magnitude larger than current experimental limits. ~Axions as dark matter can be thought of as an oscillatory field interacting extremely weakly with normal matter. ~The oscillation frequency is unknown, it can be anywhere between $f \quad =$ 200MHz to 200GHz and it's expected to be at a very narrow line, about d$f$/$f=$10\textasciicircum -6. ~A strong magnetic field can be used to convert part of that field into a very weak electric field oscillating at the same frequency and phase as the axion field. ~In the coming years we plan to develop our experimental sensitivity to either observe or refute the axions as a viable dark matter candidate in a wide axion mass range. ~That approach includes the development of ultra strong magnets, high quality resonators in the presence of strong B-fields, new resonator geometries, low noise cryo-amplifiers and new techniques of detecting axions. ~ Another related subject, through the strong CP-problem, is the search for the EDM of the proton, improving the present sensitivity on hadronic EDMs by more than three orders of magnitude to better than 10\textasciicircum \textbraceleft -29\textbraceright $e$-cm. Usually the study of EDM involves the application of strong electric fields and originally neutral systems were thought to be easier to work with. Recently it became clear that charged particles in all-electric storage rings can be used for sensitive EDM searches by using techniques similar to the muon g-2 experiment. The high sensitivity study of the proton EDM is possible due to the high intensity polarized proton beams readily available today, making possible to reach 10$^{3\, }$TeV in New Physics scale. [Preview Abstract] |
Saturday, January 28, 2017 11:57AM - 12:33PM |
B8.00003: Global Positioning System as a dark matter detector Invited Speaker: Andrei Derevianko Cosmological observations indicate that dark matter (DM) constitutes 85\% of all matter in the Universe, yet conclusive evidence for DM in terrestrial experiments remains elusive. One of the possibilities is that DM can be composed from ultralight quantum fields whose self-interactions lead to the formation of DM objects in the form of stable topological defects. Such DM ``clumps'', depending on the masses of underlying fields, can be spatially large on the laboratory scale. As the Earth moves through the halo of DM objects, interactions with such DM clumps could lead to measurable variations in GPS signals which propagate through the satellite constellation at galactic velocities of $\sim 300$ km/s. Here we use the network of atomic clocks onboard GPS satellites as a $\sim50,000\,{\rm km}$ aperture DM detector. By mining over a decade of archival GPS data, we find no evidence for topological defects in the form of domain walls at our current sensitivity, which enables us to improve the present limits on certain DM--ordinary matter coupling strengths by up to six orders of magnitude. [Preview Abstract] |
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