Fermionic physics from ab initio path integral Monte Carlo simulations of fictitious identical particles. [PDF]
Journal of Chemical Physics, 2023 The ab initio path integral Monte Carlo (PIMC) method is one of the most successful methods in statistical physics, quantum chemistry and related fields, but its application to quantum degenerate Fermi systems is severely hampered by an exponential ...
T. Dornheim +5 more
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A double-hybrid density functional based on good local physics with outstanding performance on the GMTKN55 database. [PDF]
Journal of Chemical Physics, 2023 In two recent papers [A. D. Becke, J. Chem. Phys. 156, 214101 (2022) and A. D. Becke, J. Chem. Phys. 157, 234102 (2022)], we compared two Kohn-Sham density functionals based on physical modeling and theory with the best density-functional power-series ...
A. Becke, Golokesh Santra, Jan Martin
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Learning new physics efficiently with nonparametric methods [PDF]
The European Physical Journal C, 2022 We present a machine learning approach for model-independent new physics searches. The corresponding algorithm is powered by recent large-scale implementations of kernel methods, nonparametric learning algorithms that can approximate any continuous ...
M. Letizia +7 more
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Hyper-parameter tuning of physics-informed neural networks: Application to Helmholtz problems [PDF]
Neurocomputing, 2022 We consider physics-informed neural networks (PINNs) [Raissi et al., J.~Comput. Phys. 278 (2019) 686-707] for forward physical problems. In order to find optimal PINNs configuration, we introduce a hyper-parameter optimization (HPO) procedure via ...
Paul Escapil-Inchausp'e, G. A. Ruz
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Precision Determination of Isotope Shifts in Ytterbium and Implications for New Physics. [PDF]
Physical Review Letters, 2021 We report measurements of isotope shifts for the five spinless Yb isotopes on the 6s^{2} ^{1}S_{0}→5d6s ^{1}D_{2} transition using Doppler-free two-photon spectroscopy. We combine these data with existing measurements on two transitions in Yb^{+} [Counts
N. L. Figueroa +5 more
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Stimulated Raman adiabatic passage in physics, chemistry, and beyond [PDF]
, 2016 The technique of stimulated Raman adiabatic passage (STIRAP), which allows efficient and selective population transfer between quantum states without suffering loss due to spontaneous emission, was introduced in 1990 (Gaubatz \emph{et al.}, J. Chem. Phys.
N. Vitanov +3 more
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Learning multivariate new physics [PDF]
The European Physical Journal C, 2019 We discuss a method that employs a multilayer perceptron to detect deviations from a reference model in large multivariate datasets. Our data analysis strategy does not rely on any prior assumption on the nature of the deviation.
R. D’Agnolo +4 more
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Neutrino, electroweak, and nuclear physics from COHERENT elastic neutrino-nucleus scattering with refined quenching factor [PDF]
Physical Review D, 2019 We present an updated analysis of the coherent neutrino-nucleus elastic scattering data of the COHERENT experiment, taking into account the new quenching factor published recently in [Phys. Rev. D 100, 033003 (2019)].
M. Cadeddu +4 more
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Physics and Geometry of Knots-Quivers Correspondence [PDF]
Communications in Mathematical Physics, 2018 The recently conjectured knots-quivers correspondence (Kucharski et al. in Phys Rev D 96(12):121902, 2017. arXiv:1707.02991, Adv Theor Math Phys 23(7):1849–1902, 2019.
T. Ekholm, P. Kucharski, Pietro Longhi
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Partial Differential Equations, Spectral Theory, and Mathematical Physics [PDF]
Partial Differential Equations, Spectral Theory, and Mathematical Physics, 2020 We investigate spectral and asymptotic properties of the particular Schrodinger operator (also known as the Bloch-Torrey operator), $-\Delta + i g x$, in infinite periodically perforated domains of $\mathbb R^d$.
D. Grebenkov, Nicolas Moutal, B. Helffer
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