Publications associées à Approximation BKW

Effect of a temperature gradient on the screening properties of ionic fluids

The electrostatic screening properties of ionic fluids are of paramount importance in countless physical processes. Yet the screening behavior of ionic conductors out of thermal equilibrium has to date mainly been studied in the context of thermoelectric p ...

AMER PHYSICAL SOC2023

Identifying Large Charge operators

Riccardo Rattazzi, Alexander Monin, Gil Badel

The Large Charge sector of Conformal Field Theory (CFT) can generically be described through a semiclassical expansion around a superfluid background. In this work, focussing on U(1) invariant Wilson-Fisher fixed points, we study the spectrum of spinning l ...

SPRINGER2023

Policy Gradient Algorithms for Robust MDPs with Non-Rectangular Uncertainty Sets

Daniel Kuhn, Mengmeng Li, Tobias Sutter

We propose a policy gradient algorithm for robust infinite-horizon Markov Decision Processes (MDPs) with non-rectangular uncertainty sets, thereby addressing an open challenge in the robust MDP literature. Indeed, uncertainty sets that display statistical ...

2023

Influence of static correlation on the magnon dynamics of an itinerant ferromagnet with competing exchange interactions: First-principles study of MnBi

Henrik Moodysson Rønnow, Thorbjørn Skovhus

We present first-principles calculations of the dynamic susceptibility in strained and doped ferromagnetic MnBi using time-dependent density functional theory. In spite of being a metal, MnBi exhibits signatures of strong correlation and a proper descripti ...

AMER PHYSICAL SOC2022

Ab initio semiclassical evaluation of vibrationally resolved electronic spectra with thawed Gaussians

Jiri Vanicek, Tomislav Begusic

Vibrationally resolved electronic spectra of polyatomic molecules provide valuable information about the quantum properties of both electrons and nuclei. This chapter reviews the recent progress in ab initio semiclassical calculations of such spectra, base ...

Elsevier2021

MATHICSE Technical Report: Stability properties of a projector-splitting scheme for the dynamical low rank approximation of random parabolic equations

Fabio Nobile, Yoshihito Kazashi, Eva Vidlicková

We consider the Dynamical Low Rank (DLR) approximation of random parabolic equations and propose a class of fully discrete numerical schemes. Similarly to the continuous DLR approximation, our schemes are shown to satisfy a discrete variational formulation ...

MATHICSE2020

Semiclassical analysis of the quantum instanton approximation

Jiri Vanicek, Christophe Louis Joseph Jean-Luc Vaillant

We explore the relation between the quantum and semiclassical instanton approximations for the reaction rate constant. From the quantum instanton expression, we analyze the contributions to the rate constant in terms of minimum-action paths and find that t ...

2019

Tunneling Splittings in Water Clusters from Path Integral Molecular Dynamics

Christophe Louis Joseph Jean-Luc Vaillant

We present calculations of tunneling splittings in selected small water clusters, based on a recently developed path integral molecular dynamics (PIMD) method. The ground-rotational-state tunneling motions associated with the largest splittings in the wate ...

2019

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Approximation BKW

Low-Rank Tensor Methods for High-Dimensional Problems

Effect of a temperature gradient on the screening properties of ionic fluids

Identifying Large Charge operators

Policy Gradient Algorithms for Robust MDPs with Non-Rectangular Uncertainty Sets

Influence of static correlation on the magnon dynamics of an itinerant ferromagnet with competing exchange interactions: First-principles study of MnBi

Ab initio semiclassical evaluation of vibrationally resolved electronic spectra with thawed Gaussians

Normalized Gaussian path integrals

MATHICSE Technical Report: Stability properties of a projector-splitting scheme for the dynamical low rank approximation of random parabolic equations

Semiclassical analysis of the quantum instanton approximation

Tunneling Splittings in Water Clusters from Path Integral Molecular Dynamics

Graph Chatbot

Chattez avec Graph Search

Effect of a temperature gradient on the screening properties of ionic fluids

Low-Rank Tensor Methods for High-Dimensional Problems

Policy Gradient Algorithms for Robust MDPs with Non-Rectangular Uncertainty Sets

Identifying Large Charge operators

Influence of static correlation on the magnon dynamics of an itinerant ferromagnet with competing exchange interactions: First-principles study of MnBi

Ab initio semiclassical evaluation of vibrationally resolved electronic spectra with thawed Gaussians

Normalized Gaussian path integrals

MATHICSE Technical Report: Stability properties of a projector-splitting scheme for the dynamical low rank approximation of random parabolic equations

Semiclassical analysis of the quantum instanton approximation

Tunneling Splittings in Water Clusters from Path Integral Molecular Dynamics