ORCID Profile
0000-0002-0345-6375
Current Organisation
University of Queensland
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Atomic molecular and optical physics | Nuclear physics | Particle physics | Atomic, Molecular, Nuclear, Particle and Plasma Physics | Galactic Astronomy | Particle Physics | Atomic and molecular physics | Atomic and Molecular Physics |
Publisher: American Physical Society (APS)
Date: 10-11-2014
Publisher: American Physical Society (APS)
Date: 29-08-2014
Publisher: American Physical Society (APS)
Date: 27-08-2021
Publisher: American Physical Society (APS)
Date: 26-02-2020
Publisher: American Physical Society (APS)
Date: 05-05-2020
Publisher: American Physical Society (APS)
Date: 19-08-2014
Publisher: American Physical Society (APS)
Date: 12-01-2016
Publisher: American Physical Society (APS)
Date: 17-10-2019
Publisher: American Physical Society (APS)
Date: 30-05-2023
Publisher: IOP Publishing
Date: 09-2020
Abstract: We search for transient variations of the fine structure constant using data from a European network of fiber-linked optical atomic clocks. By searching for coherent variations in the recorded clock frequency comparisons across the network, we significantly improve the constraints on transient variations of the fine structure constant. For ex le, we constrain the variation to | δα / α | 5 × 10 −17 for transients of duration 10 3 s. This analysis also presents a possibility to search for dark matter, the mysterious substance hypothesised to explain galaxy dynamics and other astrophysical phenomena that is thought to dominate the matter density of the universe. At the current sensitivity level, we find no evidence for dark matter in the form of topological defects (or, more generally, any macroscopic objects), and we thus place constraints on certain potential couplings between the dark matter and standard model particles, substantially improving upon the existing constraints, particularly for large (≳10 4 km) objects.
Publisher: American Physical Society (APS)
Date: 18-05-2023
Publisher: American Physical Society (APS)
Date: 13-05-2013
Publisher: IOP Publishing
Date: 07-09-2015
Publisher: American Physical Society (APS)
Date: 06-01-2014
Publisher: American Physical Society (APS)
Date: 31-01-2022
Publisher: American Physical Society (APS)
Date: 23-04-2018
Publisher: American Physical Society (APS)
Date: 28-06-2016
Publisher: Springer Science and Business Media LLC
Date: 21-02-2020
DOI: 10.1140/EPJQT/S40507-020-00081-9
Abstract: There are several networks of precision quantum sensors in existence, including networks of atomic clocks, magnetometers, and gravitational wave detectors. These networks can be re-purposed for searches of exotic physics, such as direct dark matter searches. Here we explore a detection strategy for macroscopic dark matter objects with such networks using the matched-filter technique. Such “clumpy” dark matter objects would register as transients sweeping through the network at galactic velocities. As a specific ex le, we consider a network of atomic clocks aboard the Global Positioning System (GPS) satellites. We apply the matched-filter technique to simulated GPS atomic clock data and study its utility and performance. The analysis and the developed methodology have a discovery reach up to three orders of magnitude above the previous GPS results and have a wide applicability to other networks of quantum sensors.
Publisher: Springer Science and Business Media LLC
Date: 30-10-2017
DOI: 10.1038/S41467-017-01440-4
Abstract: Cosmological observations indicate that dark matter makes up 85% of all matter in the universe yet its microscopic composition remains a mystery. Dark matter could arise from ultralight quantum fields that form macroscopic objects. Here we use the global positioning system as a ~ 50,000 km aperture dark matter detector to search for such objects in the form of domain walls. Global positioning system navigation relies on precision timing signals furnished by atomic clocks. As the Earth moves through the galactic dark matter halo, interactions with domain walls could cause a sequence of atomic clock perturbations that propagate through the satellite constellation at galactic velocities ~ 300 km s −1 . Mining 16 years of archival data, we find no evidence for domain walls at our current sensitivity level. This improves the limits on certain quadratic scalar couplings of domain wall dark matter to standard model particles by several orders of magnitude.
Publisher: American Physical Society (APS)
Date: 04-02-2021
Publisher: American Physical Society (APS)
Date: 02-2023
Publisher: IOP Publishing
Date: 07-09-2015
Publisher: American Physical Society (APS)
Date: 26-10-2023
Publisher: MDPI AG
Date: 28-02-2021
Abstract: Dark matter may be composed of self-interacting ultralight quantum fields that form macroscopic objects. An ex le of which includes Q-balls, compact non-topological solitons predicted by a range of theories that are viable dark matter candidates. As the Earth moves through the galaxy, interactions with such objects may leave transient perturbations in terrestrial experiments. Here we propose a new dark matter signature: an asymmetry (and other non-Gaussianities) that may thereby be induced in the noise distributions of precision quantum sensors, such as atomic clocks, magnetometers, and interferometers. Further, we demonstrate that there would be a sizeable annual modulation in these signatures due to the annual variation of the Earth velocity with respect to dark matter halo. As an illustration of our formalism, we apply our method to 6 years of data from the atomic clocks on board GPS satellites and place constraints on couplings for macroscopic dark matter objects with radii R km, the region that is otherwise inaccessible using relatively sparse global networks.
Publisher: American Physical Society (APS)
Date: 16-10-2013
Publisher: American Physical Society (APS)
Date: 23-02-2023
Publisher: American Physical Society (APS)
Date: 02-05-2022
Publisher: American Physical Society (APS)
Date: 30-09-2019
Publisher: Annual Reviews
Date: 19-10-2015
DOI: 10.1146/ANNUREV-NUCL-102014-022331
Abstract: Studying the violation of parity and time-reversal invariance in atomic systems has proven to be a very effective means of testing the electroweak theory at low energy and searching for physics beyond it. Recent developments in both atomic theory and experimental methods have led to the ability to make extremely precise theoretical calculations and experimental measurements of these effects. Such studies are complementary to direct high-energy searches, and can be performed for only a fraction of the cost. We review the recent progress in the field of parity and time-reversal violation in atoms, molecules, and nuclei, and examine the implications for physics beyond the Standard Model, with an emphasis on possible areas for development in the near future.
Publisher: American Physical Society (APS)
Date: 28-03-2017
Publisher: American Physical Society (APS)
Date: 21-04-2014
Publisher: American Physical Society (APS)
Date: 04-08-2020
Publisher: American Physical Society (APS)
Date: 15-08-2016
Publisher: American Physical Society (APS)
Date: 13-11-2012
Publisher: American Physical Society (APS)
Date: 21-12-2012
Publisher: American Physical Society (APS)
Date: 15-07-2013
Publisher: American Physical Society (APS)
Date: 07-08-2019
Start Date: 05-2021
End Date: 12-2024
Amount: $438,835.00
Funder: Australian Research Council
View Funded ActivityStart Date: 06-2023
End Date: 06-2026
Amount: $415,043.00
Funder: Australian Research Council
View Funded Activity