121 citations · 370 across the 10 of their papers we have counts for
10 papers
Search for topological defect dark matter with a global network of optical magnetometers
Samer Afach, Ben C. Buchler, Dmitry Budker +46
Ultralight bosons such as axion-like particles are viable candidates for dark matter. They can form stable, macroscopic field configurations in the form of topological defects that…
Measuring the fine structure constant on a white dwarf surface; a detailed analysis of Fe V absorption in G191-B2B
J. Hu, J. K. Webb, T. R. Ayres +12
The gravitational potential phi = GM/Rc^2 at the surface of the white dwarf G191-B2B is 10,000 times stronger than that at the Earth's surface. Numerous photospheric absorption fea…
Four direct measurements of the fine-structure constant 13 billion years ago
Michael R. Wilczynska, John K. Webb, Matthew Bainbridge +14
Observations of the redshift z=7.085 quasar J1120+0641 have been used to search for variations of the fine structure constant, alpha, over the redshift range 5.5 to 7.1. Observatio…
Analysis method for detecting topological defect dark matter with a global magnetometer network
Hector Masia-Roig, Joseph A. Smiga, Dmitry Budker +15
The Global Network of Optical Magnetometers for Exotic physics searches (GNOME) is a network of time-synchronized, geographically separated, optically pumped atomic magnetometers t…
Primordial deuterium abundance at z=2.504 towards Q1009+2956
E. O. Zavarygin, J. K. Webb, S. Riemer-Sørensen +1
The z_abs = 2.504 Lyman Limit absorption system (LLS) towards Q1009+2956 has previously been used to estimate the primordial deuterium abundance. Since the initial measurement by B…
A precise deuterium abundance: Re-measurement of the z=3.572 absorption system towards the quasar PKS1937-101
S. Riemer-Sørensen, S. Kotuš, J. K. Webb +4
The primordial deuterium abundance probes fundamental physics during the Big Bang Nucleosynthesis and can be used to infer cosmological parameters. Observationally, the abundance c…
Probing the Gravitational Dependence of the Fine-Structure Constant from Observations of White Dwarf Stars
Matthew B. Bainbridge, Martin A. Barstow, Nicole Reindl +12
Hot white dwarf stars are the ideal probe for a relationship between the fine-structure constant and strong gravitational fields, providing us with an opportunity for a direct obse…
Network of sensitive magnetometers for urban studies
T. A. Bowen, E. Zhivun, A. Wickenbrock +6
The magnetic signature of an urban environment is investigated using a geographically distributed network of fluxgate magnetometers deployed in and around Berkeley, California. The…
Modeling long-range wavelength distortions in quasar absorption echelle spectra
Vincent Dumont, John K. Webb
Spectra observed with the Ultraviolet and Visual Echelle Spectrograph (UVES) on the European Southern Observatory's VLT exhibit long-range wavelength distortions. These distortions…
Deuterium at high-redshift: Primordial abundance in the zabs = 2.621 damped Ly-alpha system towards CTQ247
P. Noterdaeme, S. López, V. Dumont +3
The detection of neutral deuterium in the low-metallicity damped Lyman-α system at zabs = 2.621 towards the quasar CTQ247 is reported. Using a high signal-to-noise and high spectra…