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Enhancing divalent optical atomic clocks with the 1S0↔3P2 transition

https://doi.org/10.1103/PhysRevA.108.053120

Bohman, Matthew A. ; Porsev, Sergey G. ; Hume, David B. ; Leibrandt, David R. ; Safronova, Marianna S. ( November 2023 , Physical Review A)
Scalable Quantum Logic Spectroscopy

https://doi.org/10.1103/PhysRevLett.129.193603

Cui, Kaifeng ; Valencia, Jose ; Boyce, Kevin T. ; Clements, Ethan R. ; Leibrandt, David R. ; Hume, David B. ( November 2022 , Physical Review Letters)

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Potential of Accelerometers and GPS Tracking to Remotely Detect Perennial Ryegrass Staggers in Sheep

https://doi.org/10.1016/j.atech.2022.100040

Trieu, Ly Ly ; Bailey, Derek W. ; Cao, Huiping ; Son, Tran Cao ; Scobie, David R. ; Trotter, Mark G. ; Hume, David E. ; Sutherland, B. Lee ; Tobin, Colin T. ( December 2022 , Smart Agricultural Technology)

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Improved interspecies optical clock comparisons through differential spectroscopy

https://doi.org/10.1038/s41567-022-01794-7

Kim, May E. ; McGrew, William F. ; Nardelli, Nicholas V. ; Clements, Ethan R. ; Hassan, Youssef S. ; Zhang, Xiaogang ; Valencia, Jose L. ; Leopardi, Holly ; Hume, David B. ; Fortier, Tara M. ; et al ( January 2023 , Nature Physics)

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Actions of small cancellation groups on hyperbolic spaces

https://doi.org/10.1007/s10711-020-00561-3

Abbott, Carolyn R. ; Hume, David ( June 2021 , Geometriae Dedicata)

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Extending group actions on metric spaces

https://doi.org/10.1142/S1793525319500584

Abbott, Carolyn ; Hume, David ; Osin, Denis ( September 2020 , Journal of Topology and Analysis)

We address the following natural extension problem for group actions: Given a group [Formula: see text], a subgroup [Formula: see text], and an action of [Formula: see text] on a metric space, when is it possible to extend it to an action of the whole group [Formula: see text] on a (possibly different) metric space? When does such an extension preserve interesting properties of the original action of [Formula: see text]? We begin by formalizing this problem and present a construction of an induced action which behaves well when [Formula: see text] is hyperbolically embedded in [Formula: see text]. Moreover, we show that induced actions can be used to characterize hyperbolically embedded subgroups. We also obtain some results for elementary amenable groups.
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Measurement of the 27 Al + and 87 Sr absolute optical frequencies

https://doi.org/10.1088/1681-7575/abd040

Leopardi, Holly ; Beloy, Kyle ; Bothwell, Tobias ; Brewer, Samuel M ; Bromley, Sarah L ; Chen, Jwo-Sy ; Diddams, Scott A ; Fasano, Robert J ; Hassan, Youssef S ; Hume, David B ; et al ( February 2021 , Metrologia)
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Stability and the Morse boundary: STABILITY AND THE MORSE BOUNDARY

https://doi.org/10.1112/jlms.12042

Cordes, Matthew ; Hume, David ( June 2017 , Journal of the London Mathematical Society)