Bulletin of the American Physical Society
APS April Meeting 2019
Volume 64, Number 3
Saturday–Tuesday, April 13–16, 2019; Denver, Colorado
Session L09: Searches for Light Dark Matter |
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Sponsoring Units: GPMFC DAMOP Chair: Andrew Geraci, Northwestern University Room: Sheraton Governor's Square 11 |
Sunday, April 14, 2019 3:30PM - 3:42PM |
L09.00001: Constraints on axionlike dark matter with masses down to 10-23 eV/c2 William A Terrano, Eric G Adelberger, Charles A Hagedorn, Blayne R Heckel We analyzed a 6.7-year span of data from a rotating torsion-pendulum containing ≈ 1023 polarized electrons to search for the “wind” arising from ultralight, axionlike dark matter particles with masses between 10-23 and 10-18 eV/c2. Over most of this range we obtain a 95% confidence limit Fa/Ce ≥ 1 × 1015 eV on the axionlike decay constant. |
Sunday, April 14, 2019 3:42PM - 3:54PM |
L09.00002: Direct Search for Ultra-light Dark Matter with Torsion Balances Erik A Shaw, Charles A Hagedorn, Krishna Venkateswara, Eric G Adelberger, Jens H Gundlach Recent theoretical work has motivated ultra-light bosonic dark matter with masses as small as 10-22 eV. Our previous torsion-balance equivalence-principle tests have placed limits on the static forces mediated by such bosons between normal test and source masses. (B-L)-coupled vector dark matter would produce a time-varying composition-dependent differential acceleration detectable in our torsion balance instruments. Using fused silica torsion fibers, we have significantly improved the statistical noise of our torsion balance. We have taken data that will set new limits on (B-L)-coupled dark matter candidates in the mass range 5x10-18 - 5x10-16 eV. |
Sunday, April 14, 2019 3:54PM - 4:06PM |
L09.00003: New results in searches for low-mass dark matter and dark bosons with AMO experiments Yevgeny Stadnik, Victor Flambaum We report new results in searches for low-mass bosonic dark matter (which forms a coherently oscillating classical field) and dark bosons (which mediate anomalous new forces) with various AMO experiments. New results in searches for low-mass dark matter include searches for anomalous time-varying spin-dependent effects, including oscillating electric dipole moments (EDMs), with mercury atoms and ultracold neutrons [Abel et al., PRX 7, 041034 (2017)], and single antiprotons [Smorra, Stadnik, Budker, Ulmer et al., In preparation], as well as searches for time-varying fundamental constants and violations of the equivalence principle using atomic clock spectroscopy and both lab- and space-based torsion pendulum experiments [Hees, Minazzoli, Savalle, Stadnik, Wolf, PRD 98, 064051 (2018)]. New results in searches for dark bosons include searches for anomalous new forces in EDM experiments [Stadnik, Dzuba, Flambaum, PRL 120, 013202 (2018); Dzuba, Flambaum, Samsonov, Stadnik, PRD 98, 035048 (2018)], parity non-conservation experiments [Dzuba, Flambaum, Stadnik, PRL 119, 223201 (2017)] and antiprotonic helium spectroscopy [Ficek, Fadeev, Flambaum, Jackson Kimball, Kozlov, Stadnik, Budker, PRL 120, 183002 (2018)]. Our new limits improve on previous bounds by many orders of magnitude. |
Sunday, April 14, 2019 4:06PM - 4:18PM |
L09.00004: "Fuzzy" Dark Matter Direct Detection with Quantum Gyroscopes: Status, Challenges and Prospects William A Terrano I will present experimental efforts towards a laboratory search for "Fuzzy" dark matter based on atomic gyroscopes. Fuzzy dark matter -- DM whose wavelength is comparable to the smallest observed galaxies -- is an intriguing dark matter candidate. It is easily meets all the requirements of dark matter, while also resolving some tension between the cold dark matter paradigm and astrophysical observations. Furthermore, it is naturally produced with the correct abundance by symmetry-breaking at the Planck scale, a very well motivated scenario that happens at the energy scale where gravity and quantum mechanics are expected to unify. Direct searches are a long way from Planck-scale sensitivity, but I will present data showing that we should have sensitivity to new regions of well-motivated dark matter parameter space in the near future. I will describe the experimental approach which is based on quantum mechanical gyroscopes, along with recent progress in adapting them to a viable search for fuzzy DM. I will also touch on the specific challenges faced when searching for dark matter of such low mass. |
Sunday, April 14, 2019 4:18PM - 4:30PM |
L09.00005: Search for beyond-the-Standard-Model Physics Using Optically Trapped Particles Sumita Ghosh, Gadi Afek, Fernando Monteiro, Andrew Kilby, David C Moore Models of dark matter where the particles carry a tiny electric charge (<<1 e) can arise from the presence of new forces in a hidden sector, which could mix weakly with Standard Model forces. Such stable “millicharged” dark matter particles can be searched for if they becomes bound in matter. We use an optical trap to measure the response to an applied electric field on an object with no net integer charge, but which may contain such particles. This experiment has a fractional charge sensitivity of 10−4 electrons/ √ Hz for a wide range of millicharged particle masses, allowing exploration of uncharted regions of parameter space for such dark matter candidates. |
Sunday, April 14, 2019 4:30PM - 4:42PM |
L09.00006: Progress in dark matter search with the global positioning system Conner Dailey, Ben Roberts, Vincent Dumont, Ibraheem Khan, Guglielmo Panelli, Geoffrey Blewitt, Andrei Derevianko The microscopic composition of dark matter remains a mystery, but it could arise from ultralight quantum fields that form macroscopic objects. By analyzing the global positioning system (GPS) satellite atomic clock data, it is possible to search for transient signatures of exotic physics, such as “clumpy” dark matter, by using the GPS constellation as a 50,000 km aperture sensor array. Interactions with domain walls could cause a sequence of atomic clock perturbations that propagate through the satellite constellation at galactic velocities ~ 300 km/s. In initial searches in 16 years of archival data, we found no evidence for domain walls, which improved the limits on certain quadratic scalar couplings of domain wall dark matter to standard model particles by several orders of magnitude [1]. We now characterize two data analysis methods for improving these limits: (i) a matched filter technique and (ii) a Bayesian statistics method [2]. We show that these techniques can improve upon our previously established constraints on dark matter couplings by two orders of magnitude. Details in: Roberts et al., Nat. Commun., 97, 083009 (2017); Roberts et al., Phys. Rev. D, 118, 221102 (2018). |
Sunday, April 14, 2019 4:42PM - 4:54PM |
L09.00007: Search for Axion dark Matter at UWA Michael Tobar At UWA we have funded axion detection programs for several mass ranges. The research program includes 1) Oscillating Resonant Group AxioN, ORGAN, an experiment to search the mass range 0.06 to 0.21 mev using a 14 Tesla magnet, dilution fridge and novel microwave cavity designs [1]. 2) New experiments with spins, which coupling photonic cavities to magnetic spin wave materials [2] such as YIG and LiFe [3,4]. Such cavities couple, via spin interactions to a particular ALPs governed by the DFSZ model. 3) New low mass broad band and resonant schemes based on lumped LC elements for very low-mass ALPS will developed, which will rival currently proposed magnetometer schemes, with a simpler architecture [5,6]. 4) New experiments with two photons. The new haloscope will excite two highly stabilized photon modes and search for perturbations in these modes caused by galactic halo axions [7,8]. An overview of work done to date and future plans will be presented. 1. arXiv:1706.00209 [phys.ins-det] 2 . arXiv:1811.09348 [phys.ins-det] 3. arXiv:1711.09980 [cond-mat.str-el] 4. arXiv:1408.2905 [quant-ph] 5. arXiv:1809.01654 [hep-ph] 6. arXiv:1605.05427 [phys.ins-det] 7. arXiv:1806.07141 [phys.ins-det] 8. arXiv:1809.07723 [hep-ex] |
Sunday, April 14, 2019 4:54PM - 5:06PM |
L09.00008: Status of the TREK/E36 experiment Michael Kohl, Tongtong Cao, Dongwi H Dongwi Experiment E36 has recorded stopped-kaon decay data at the J-PARC K1.1BR beamline for a precision measurement of the ratio of decay widths BR(K+ --> e+ν) and BR(K+ --> μ+ν), respectively, to test lepton universality, and to search for rare decay modes producing light neutral bosons. An overview of the experiment and analysis status will be presented. |
Sunday, April 14, 2019 5:06PM - 5:18PM |
L09.00009: Search for light neutral bosons in the experiment E36 at J-PARC Dongwi H Dongwi, Tongtong Cao, Michael Kohl The TREK/E36 experiment conducted at J-PARC in Japan aims to test lepton universality in the ratio of decay widths, RK = Γ(Ke2)/Γ(Kμ2) by utilizing a K+ beam stopped in a scintillating fiber target. Additionally the set-up of the E36 detector system facilitates searches for light U(1) gauge bosons below 300 MeV/c2. These bosons could be associated with dark matter or explain the established muon-related anomalies such as the muon g-2 value, and the proton radius puzzle. Particle identification systems in combination with a highly segmented CsI(Tl) photon calorimeter covering 75% of 4π are being used to search for these exotic particles in rare K+ decay modes. The status of the particle search as well as simulation based exclusion limits will be presented.
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Sunday, April 14, 2019 5:18PM - 5:30PM |
L09.00010: A Two-Charge Theory of Gravity Hyung S Choi, Draven W Houser, Ye Jin Han Our current standard theory of gravity is unable to explain the mechanism behind the accelerating expansion of the universe. This expansion seems to imply a repulsive property or force associated with gravitational interaction. We propose a two-charge theory of gravity based on the Quantum Field Theory applied to a second rank tensor field that allows for an attractive force between like charges and a repulsive force between opposite charges. This model could explain the accelerating expansion of the universe, and potentially, the matter-antimatter asymmetry. Our calculation of a lattice model with a billion points shows that the net gravitational force at any spacetime point would be slightly repulsive. This new model is also consistent with the local physics described by the standard theory of gravity. Our theory may be experimentally supported by results from the ALPHA Collaboration. |
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