Bulletin of the American Physical Society
APS April Meeting 2019
Volume 64, Number 3
Saturday–Tuesday, April 13–16, 2019; Denver, Colorado
Session X07: Precision Searches for New Long-range forces, from Quantum Sensors to SpacecraftInvited Undergraduate
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Sponsoring Units: GPMFC DGRAV Chair: Charles Hagedorn, University of Washington Room: Sheraton Governor's Square 16 |
Tuesday, April 16, 2019 10:45AM - 11:21AM |
X07.00001: MICROSCOPE: First Constraints on the Violation of the Weak Equivalence Principle by a Light Scalar Dilaton Invited Speaker: Joel Bergé MICROSCOPE is a CNES-ESA-DLR-ONERA-CNRS-OCA-ZARM space mission that aimed to test the Weak Equivalence Principle (WEP) at the 10^-15 level, i.e. two orders of magnitude better than the best "pre-MICROSCOPE" on-ground tests. The WEP is the cornerstone of General Relativity, the postulate that led Einstein to establish his theory: it states that all bodies fall at the same rate, independently of their mass and composition. Alternative theories of gravity, like those developed to overcome such conundrums as dark energy or the unification of gravity with the forces of the standard model of particle physics, generically predict a small violation of the WEP. As a consequence, not only does MICROSCOPE test the very foundation of General Relativity, but it also provides new constraints on theories beyond Einstein's. |
Tuesday, April 16, 2019 11:21AM - 11:57AM |
X07.00002: Searching for exotic spin-dependent interactions with a single electron-spin quantum sensor Invited Speaker: Xing Rong Searching for new particles beyond the standard model is crucial for understanding several fundamental conundrums in physics and astrophysics. Several hypothetical particles can mediate exotic spin-dependent interactions between ordinary fermions, which enable laboratory searches via the detection of the interactions. We present a novel platform for investigating exotic spin-dependent interactions with micrometer scales. NV centers in diamond have been utilized as quantum sensors to search for the exotic spin-dependent interactions. We first show an experiment to constrain the electron-nucleon coupling with the force range 0.1-23 micrometers. We also show that upper limits on the exotic dipole-dipole interactions between electrons can be established at force range from 10-900 micrometers by our method. |
Tuesday, April 16, 2019 11:57AM - 12:33PM |
X07.00003: Fundamental Limits of Electromagnetic Axion and Hidden-Photon Dark Matter Searches Invited Speaker: Kent David Irwin Ultralight, wavelike dark matter candidates can be detected via their coupling to electromagnetic modes. Recently, a number of experimental proposals have emerged to search for QCD axion dark matter over its entire allowed mass range (~1 peV - ~10meV). We describe the fundamental optimization of searches for for wavelike dark-matter candidates, including particularly the QCD axion, with electromagnetic sensors. The sensitivity of detection of the excitation of these modes is set by vacuum noise, thermal noise, and the noise added by amplification, and fundamental limits on optimized searches for QCD axion dark matter are imposed by the Standard Quantum Limit. Single-pole resonators can approach the fundamental limit of sensitivity for probes of axion dark matter, and the optimization of measurement backaction and sensitivity outside of the resonator bandwidth can increase scan rates by up to five orders of magnitude at low frequency. We also discuss the application of quantum sensing techniques to evade the Standard Quantum Limit on amplification to enable a complete probe of QCD axion dark matter below 1 micro eV.
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