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Nuclear Theory·nucl-th

Monday·January 31, 2022

5 papers—2 primary·3 cross-listed

All5Primary2Cross-lists3
  1. 03

    Euclidean thermal correlation functions in local QFT

    Peter Lowdon🇩🇪

    In this work we outline the general analytic characteristics satisfied by scalar correlation functions at finite temperature in local quantum field theory. We demonstrate that the locality of the fields in particular imposes significant constraints on the spectral structure of the theory, and that this enables the non-perturbative effects experienced by thermal particle states to be directly calculated from Euclidean correlation functions, avoiding the inverse problem.

    ↳ hep-thhep-phnucl-thPRD(2022)·13 citations
  2. 04

    New tool for kinematic regime estimation in semi-inclusive deep-inelastic scattering

    M. Boglione🇮🇹 · M. Diefenthaler🇺🇸 · S. Dolan🇺🇸 · L. Gamberg🇺🇸 · W. Melnitchouk🇺🇸 · D. Pitonyak🇺🇸 · A. Prokudin🇺🇸 · N. Sato🇺🇸 · Z. Scalyer🇺🇸

    We introduce a new phenomenological tool based on momentum region indicators to guide the analysis and interpretation of semi-inclusive deep-inelastic scattering measurements. The new tool, referred to as "affinity", is devised to help visualize and quantify the proximity of any experimental kinematic bin to a particular hadron production region, such as that associated with transverse momentum dependent factorization. We apply the affinity estimator to existing HERMES and COMPASS data and expected data from Jefferson Lab and the future Electron-Ion Collider. We also provide an interactive notebook based on Machine Learning for fast evaluation of affinity.

    ↳ hep-phhep-exhep-thnucl-thJHEP(2022)·16 citations
  3. 05

    Conservative finite volume scheme for first-order viscous relativistic hydrodynamics

    Alex Pandya · Elias R. Most · Frans Pretorius

    We present the first conservative finite volume numerical scheme for the causal, stable relativistic Navier-Stokes equations developed by Bemfica, Disconzi, Noronha, and Kovtun (BDNK). BDNK theory has arisen very recently as a promising means of incorporating entropy-generating effects (viscosity, heat conduction) into relativistic fluid models, appearing as a possible alternative to the so-called Müller-Israel-Stewart (MIS) theory successfully used to model quark-gluon plasma. The major difference between the two lies in the structure of the system of PDEs: BDNK theory only has a set of conservation laws, whereas MIS also includes a set of evolution equations for its dissipative degrees of freedom. The simpler structure of the BDNK PDEs in this respect allows for rigorous proofs of stability, causality, and hyperbolicity in full generality which have as yet been impossible for MIS. To capitalize on these advantages, we present the first fully conservative multi-dimensional fluid solver for the BDNK equations suitable for physical applications. The scheme includes a flux-conservative discretization, non-oscillatory reconstruction, and a central-upwind numerical flux, and is designed to smoothly transition to a high-resolution shock-capturing perfect fluid solver in the inviscid limit. We assess the robustness of our new method in a series of flat-spacetime tests for a conformal fluid, and provide a detailed comparison with previous approaches of Pandya & Pretorius (2021).

    ↳ gr-qcastro-ph.HEnucl-thphysics.comp-phPRD(2022)·45 citations

Affiliations

first authorsco-authorsvia INSPIRE