A5062619766- Atomic and Subatomic Physics Research
- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Quantum, superfluid, helium dynamics
- Cold Atom Physics and Bose-Einstein Condensates
- Particle physics theoretical and experimental studies
- Astrophysics and Cosmic Phenomena
- Galaxies: Formation, Evolution, Phenomena
- Quantum and electron transport phenomena
- Geophysics and Sensor Technology
- Advanced Frequency and Time Standards
- Advanced MEMS and NEMS Technologies
- Computational Physics and Python Applications
- Mechanical and Optical Resonators
- Noncommutative and Quantum Gravity Theories
- Astrophysical Phenomena and Observations
- Geophysics and Gravity Measurements
- Radioactive Decay and Measurement Techniques
- Quantum Mechanics and Applications
- Astro and Planetary Science
- Earthquake Detection and Analysis
- Magnetic Field Sensors Techniques
- Quantum Chromodynamics and Particle Interactions
- Radio Astronomy Observations and Technology
- Black Holes and Theoretical Physics
Arizona State University
2021-2024
Agency for Science, Technology and Research
2023
Institute of Materials Research and Engineering
2023
Princeton University
2021
University of Washington
2010-2019
Technical University of Munich
2016-2019
Excellence Cluster Universe
2019
The mass of the dark matter particle is unknown, and may be as low $\ensuremath{\sim}1{0}^{\ensuremath{-}22}\text{ }\text{ }\mathrm{eV}$. lighter part this range, below $\ensuremath{\sim}\mathrm{eV}$, relatively unexplored both theoretically experimentally but contains an array natural candidates. An example relaxion, a light boson predicted by cosmological solutions to hierarchy problem. One few generic signals such can produce time-oscillating, equivalence-principle-violating force. We...
Axion-like particles are promising candidates to make up the dark matter of universe, but it is challenging design experiments that can detect them over their entire allowed mass range. Dark in general, and particular axion-like hidden photons, be as light roughly $10^{-22} \;\rm{eV}$ ($\sim 10^{-8} \;\rm{Hz}$), with astrophysical anomalies providing motivation for lightest masses ("fuzzy matter"). We propose experimental techniques direct detection range from $10^{-13} 10^2 \;\rm{Hz}$) down...
We used a torsion pendulum and rotating attractor with 20-pole electron-spin distributions to probe dipole-dipole interactions mediated by exotic pseudo-Goldstone bosons m(b)c(2)≤500 μeV coupling strengths up 14 orders of magnitude weaker than electromagnetism. This corresponds symmetry-breaking scales F≤70 TeV, the highest reached in any laboratory experiment. an unpolarized mass distribution improve bounds on CP-violating monopole-dipole forces 1.5 μeV<m(b)c(2)<400 factor 1000.
Abstract Modern comagnetometry is—in absolute energy units—the most sensitive experimental technique for measuring the splitting between quantum states, with certain implementations nuclear spin-up/spin-down at 10 −26 eV level. By and subtracting leading magnetic effects on spins, can be used to study non-standard-model spin interactions. New physics scenarios that comagnetometers probe include EDMs, violations of Lorentz invariance, Goldstone bosons from new high-energy symmetries,...
Ultralight axion-like particles can contribute to the dark matter near Sun, leading a distinct, stochastic signature in terrestrial experiments. We search for such through their neutron-spin coupling by re-analyzing approximately 40 days of data from K-$^3$He co-magnetometer with new frequency-domain likelihood-based formalism that properly accounts effects over all axion coherence times relative experimental time span. Assuming axions make up Sun's vicinity, we find median 95% upper limit...
We report results of a new technique to measure the electric dipole moment $^{129}\mathrm{Xe}$ with $^{3}\mathrm{He}$ comagnetometry. Both species are polarized using spin-exchange optical pumping, transferred measurement cell, and transported into magnetically shielded room, where SQUID magnetometers detect free precession in applied magnetic fields. The result from one week campaign 2017 2.5 2018, combined detailed study systematic effects, is...
Ultralight axionlike particles are well-motivated dark matter candidates that the target of numerous direct detection efforts. In vicinity Solar System, such can be treated as oscillating scalar fields. The velocity dispersion Milky Way determines a coherence time about ${10}^{6}$ oscillations, beyond which amplitude axion field fluctuates stochastically. Any analysis data from an experiment must carefully account for this stochastic behavior to properly interpret results. This is especially...
We analyzed a 6.7-yr span of data from rotating torsion-pendulum containing ≈10^{23} polarized electrons to search for the "wind" arising ultralight, axionlike dark matter with masses between 10^{-23} and 10^{-18} eV/c^{2}. Over much this range we set 95% confidence limit F_{a}/C_{e}>2×10^{15} eV on decay constant.
We surrounded a rotating torsion pendulum containing $9.8\ifmmode\times\else\texttimes\fi{}{10}^{22}$ polarized electrons by 2 or 4 stationary sources, each with net spin of $6.0\ifmmode\times\else\texttimes\fi{}{10}^{24}$ electrons. Multiple source configurations gave sensitivity to hypothetical dipole-dipole, spin-dot-spin, and spin-cross-spin exchange interactions mediated bosons masses up $20\text{ }\text{ }\ensuremath{\mu}\mathrm{eV}$. For $\ensuremath{\le}0.1\text{...
Polarized nuclei are a powerful tool in nuclear-spin studies and the search for physics beyond standard model. Systems which compare two nuclear species have thus far been limited by anomalous yet reproducible frequency variations of unknown origin. We studied self-interactions $^{3}\mathrm{He}\ensuremath{-}^{129}\mathrm{Xe}$ system independently addressing, controlling, measuring influence each component polarization. Our results directly rule out prior explanations shifts demonstrate...
We report on Chandra X-ray observations of possible-AGNs which have been correlated with Ultra-high Energy Cosmic Rays (UHECRs) observed by the Pierre Auger Collaboration. Combining our optical observations, we conclude that one-third 21 Veron-Cetty Veron (VCV) galaxies correlating UHECRs in first data-release are actually not AGNs. review existing 20 VCV second and determine three them AGNs two uncertain. Overall, 57 published |b|>10 degrees, 22 or 23 correlate true using correlation...
We used a rotating torsion pendulum containing ≈1023 polarized electrons placed in an orientable quadrupole source to constrain Bonder and Sudarsky's quantum-gravity effect based on Lorentz-invariant spacetime granularity model proposed by Corichi Sudarsky. Our null results the model's free parameters 13 orders of magnitude more tightly than those Sudarsky obtained reinterpreting data from previous neutron experiment that was designed test Lorentz invariance.
We report results of a new technique to measure the electric dipole moment $^{129}$Xe with $^3$He comagnetometry. Both species are polarized using spin-exchange optical pumping, transferred measurement cell, and transported into magnetically shielded room, where SQUID magnetometers detect free precession in applied magnetic fields. The result from one week campaign 2017 2.5 2018, combined detailed study systematic effects, is $d_A(^{129}\mathrm{Xe}) = (1.4 \pm 6.6_\mathrm{stat}...
Measuring gravitational interactions on sub-100-$\mu$m length scales offers a window into physics beyond the Standard Model. However, short-range gravity experiments are limited by ability to position sufficiently massive objects within small separation distances. Here we propose mass-loaded silicon nitride ribbons as platform for testing inverse square law at separations currently inaccessible with traditional torsion balances. These microscale resonators benefit from low thermal noise due...
Measuring gravitational interactions on sub−100−μm length scales offers a window into physics beyond the Standard Model. However, short-range gravity experiments are limited by ability to position sufficiently massive objects within small separation distances. Here we propose mass-loaded silicon nitride ribbons as platform for testing inverse square law at separations currently inaccessible with traditional torsion balances. These microscale resonators benefit from low thermal noise due...
We used a torsion pendulum and rotating attractor with 20-pole electron-spin distributions to probe dipole-dipole interactions mediated by exotic pseudo-Goldstone bosons $m_{\rm b}\leq 500 \; μ$eV coupling strengths up 14 orders of magnitude weaker than electromagnetism. This corresponds symmetry-breaking scales $F \leq 70$ TeV, the highest reached in any laboratory experiment. an unpolarized mass distribution improve bounds on $CP$-violating monopole-dipole $1.5\:μ$eV$
We describe a new technique to measure the EDM of $^{129}$Xe with $^3$He comagnetometry. Both species are polarized using spin-exchange optical pumping, transferred measurement cell, and transported into magnetically shielded room, where SQUID magnetometers detect free precession in applied electric magnetic fields. The result one week run combined detailed study systematic effects is $d_A(^{129}\mathrm{Xe}) = (0.26 \pm 2.33_\mathrm{stat} 0.72_\mathrm{syst})\times10^{-27}~e\,\mathrm{cm}$....
Ultralight axion-like particles can contribute to the dark matter near Sun, leading a distinct, stochastic signature in terrestrial experiments. We search for such through their neutron-spin coupling by re-analyzing approximately 40 days of data from K-$^3$He co-magnetometer with new frequency-domain likelihood-based formalism that properly accounts effects over all axion coherence times relative experimental time span. Assuming axions make up Sun's vicinity, we find median 95% upper limit...
Abstract Two Eöt–Wash torsion balance instruments exploited optimized Fourier–Bessel geometries to test the short-distance properties of gravity and constrain exotic dipole–dipole monopole–dipole interactions. We discuss efficient analytic techniques for computing expected torques in those arising from Newtonian Yukawa interactions between unpolarized bodies on polarized test-bodies. consider systematic effects induced by weak external magnetic fields nominally also present a new expansion...