Vincent Dumont is a postdoctoral researcher working on deep learning applications with Distributed Acoustic Sensing (DAS) data. His current areas of interest are machine learning, sensor network technology, and data scalability in high-performance computing environments. Prior to joining Berkeley Lab, Vincent was a postdoc at the University of California, Berkeley where he specialized in magnetometer-networks for coherent searches of magnetic transient events. Vincent received his Ph.D. in Astrophysics from the University of New South Wales (Sydney, Australia), his M.Sc. in Astronomy from the University of Chile (Santiago, Chile), and his B.Sc. in Physics from the University Grenoble Alpes (Grenoble, France).
H. Masia-Roig, J. A. Smiga, D. Budker, V. Dumont, Z. Grujic, D. Kim, D. F. Jackson Kimball, V. Lebedev, M. Monroy, S. Pustelny, T. Scholtes, P. C. Segura, Y. K. Semertzidis, Y. Chang Shin, J. E. Stalnaker, I. Sulai, A. Weis, A. Wickenbrock, "Analysis method for detecting topological defect dark matter with a global magnetometer network", Physics of the Dark Universe, Volume 28, 100494, May 2020, doi: 10.1016/j.dark.2020.100494
M. R. Wilczynska, J. K. Webb, M. Bainbridge, S. E. I. Bosman, J. D. Barrow, R. F. Carswell, M. P. Dabrowski, V. Dumont, A. C. Leite, C. Lee, K. Leszczynska, J. Liske, K. Marosek, C. J. A. P. Martins, D. Milakovic, P. Molaro, L. Pasquini, "Four direct measurements of the fine-structure constant 13 billion years ago", Science Advances, Volume 6, No. 17, eaay9672, April 24, 2020, doi: 10.1126/sciadv.aay9672
T. Bowen, E. Zhivun, A. Wickenbrock, V. Dumont, S. D. Bale, C. Pankow, G. Dobler, J. S. Wurtele, D. Budker, "A Network of Magnetometers for Multi-Scale Urban Science and Informatics", Geosci. Instrum. Method. Data Syst., Volume 8, Issue 1, Pages 129-138, May 8, 2019, doi: 10.5194/gi-8-129-2019
S. Afach, D. Budker, G. DeCamp, V. Dumont, Z. D. Grujić, H. Guo, D. F. Jackson Kimball, T. W. Kornack, V. Lebedev, W. Li, H. Masia-Roig, S. Nix, M. Padniuk, C. A. Palm, C. Pankow, A. Penaflor, X. Peng, S. Pustelny, T. Scholtes, J. A. Smiga, J. E. Stalnaker, A. Weis, A. Wickenbrock, D. Wurm, "Characterization of the Global Network of Optical Magnetometers to search for Exotic Physics (GNOME)", Physics of the Dark Universe, Volume 22, Pages 162-180, December 2018, doi: 10.1016/j.dark.2018.10.002
E. O. Zavarygin, J. K. Webb, V. Dumont, S. Riemer-Sørensen, "The primordial deuterium abundance at z=2.504 from a high signal-to-noise spectrum of Q1009+2956", Monthly Notices of the Royal Astronomical Society, Volume 477, Issue 4, Pages 5536–5553, April 21, 2018, doi: 10.1093/mnras/sty1003
M. B. Bainbridge, M. A. Barstow, N. Reindl, L. Tchang-Brillet, T. R. Ayres, J. K. Webb, J. D. Barrow, J. Hu, J. B. Holberg, S. P. Preval, W. Ubachs, V. A. Dzuba, V. V. Flambaum, V. Dumont, J. C. Berengut, "Probing the Gravitational Dependence of the Fine-Structure Constant from Observations of White Dwarf Stars", Universe, Volume 3, Issue 2, Page 32, March 30, 2017, doi: 10.3390/universe3020032
S. Riemer-Sørensen, S. Kotuš, J. K. Webb, K. Ali, V. Dumont, M. T. Murphy, R. Carswell, J. Barrow, "A precise deuterium abundance: Re-measurement of the z=3.572 absorption system towards the quasar PKS1937–101", Monthly Notices of the Royal Astronomical Society, Volume 468, Issue 3, Pages 3239–3250, March 22, 2017, doi: 10.1093/mnras/stx681
V. Dumont, J. K. Webb, "Modelling long-range wavelength distortions in quasar absorption echelle spectra", Monthly Notices of the Royal Astronomical Society, Volume 468, Issue 2, Pages 1568-1574, February 14, 2017, doi: 10.1093/mnras/stx381
S. Riemer-Sørensen, J. K. Webb, N. Crighton, V. Dumont, K. Ali, S. Kotuš, M. Bainbridge, M. T. Murphy, R. Carswell, "A robust deuterium abundance; Re-measurement of the z=3.256 absorption system towards the quasar PKS1937-1009", Monthly Notices of the Royal Astronomical Society, Volume 447, Issue 3, Pages 2925- 2936, January 14, 2015, doi: 10.1093/mnras/stu2599
P. Noterdaeme, S. López, V. Dumont, C. Ledoux, P. Molaro, P. Petitjean, "Deuterium at high-redshift: Primordial abundance in the zabs = 2.621 damped Ly-alpha system towards CTQ247", Astronomy & Astrophysics, Volume 542, Article L33, June 8, 2012, doi: 10.1051/0004-6361/201219453
E. O. Zavarygin, J. K. Webb, S. Riemer-Sørensen, V. Dumont, "Primordial deuterium abundance at z=2.504 towards Q1009+2956", Journal of Physics: Conference Series, Volume 1038, International Conference PhysicA.SPb/2017 24–26 October 2017, Saint-Petersburg, Russian Federation, June 1, 2018, doi: 10.1088/1742-6596/1038/1/012012
Tests of Fundamental Physics Using Quasar Spectroscopy, Vincent Dumont, PhD, 2018,
Quasar absorption lines are used extensively in astrophysics to place constraints on cosmological models. In this thesis, we focus on the measurement of two important parameters in cosmology, the electromagnetic coupling constant, or fine-structure constant, α≡e2/(4πεℏc), and the primordial deuterium-to-hydrogen ratio, D/H. Any cosmological variation of α will cause its value to be different in the early stage of the Universe, therefore impacting the production of the primordial light elements during Big Bang Nucleosynthesis. We provide updated ∆α/α measurements from 280 absorption systems previously published in the literature using the non-linear least-square Voigt Profile fitting program VPFIT10. We also investigate the impact of long-range wavelength-scale distortions on those measurements. We found that long-range distortions are unlikely to explain the 4.1σ evidence for an α dipole as reported in the literature even though they do impact on the α-dipole significance. The above work led us to examine the kinematics of each absorption system in our sample. We report a correlation between the complexity of the velocity structure of Damped Lyman-α systems and the apparent position of the Lyman limit break in quasar spectra. We develop a new technique, based on this correlation, to identify suitable Damped Lyman-α systems for D/H measurements.
Systematic search of deuterium absorption lines in VLT/UVES spectra of distant quasars, Vincent Dumont, M.S., 2012,
According to the current theory of standard Big Bang nucleosynthesis, a measurement of the primordial deuterium-to-hydrogen ratio (D/H) can provide a strong constraint on the baryonic density in the universe. Indeed, D/H depends sensitively on Ωb, and can be thus considered as a “baryometer” of choice. However, because deuterium is easily destroyed inside stars, it is necessary to look for pristine gas (i.e. unprocessed by stars) to make a correct measurement of the primordial D/H ratio. To date, the only way to detect deuterium at high redshift (where the chance of finding pristine gas is higher) is through the absorption lines it imprints in the spectra of background quasars. However, this is observationally a challenging task and very few measurements have been performed so far. In this thesis, I present a systematic search for deuterium absorption lines in a large sample of high-resolution, high signal-to-noise ratio, archival spectra of quasars observed with the Ultraviolet and Visual Echelle Spectrograph mounted on the Very Large Telescope. New deuterium features have been performed and will be analyzed. I will also introduce a new python routine allowing the automatic selection and analysis of suitable candidates for the stacking method.