Recent Progress in Quantum Hadrodynamics
Abstract
Quantum hadrodynamics (QHD) is a framework for describing the nuclear manybody problem as a relativistic system of baryons and mesons. Motivation is given for the utility of such an approach and for the importance of basing it on a local, Lorentzinvariant lagrangian density. Calculations of nuclear matter and finite nuclei in both renormalizable and nonrenormalizable, effective QHD models are discussed. Connections are made between the effective and renormalizable models, as well as between relativistic meanfield theory and more sophisticated treatments. Recent work in QHD involving nuclear structure, electroweak interactions in nuclei, relativistic transport theory, nuclear matter under extreme conditions, and the evaluation of loop diagrams is reviewed.
 Authors:
 Publication Date:
 Research Org.:
 Thomas Jefferson National Accelerator Facility, Newport News, VA (US)
 Sponsoring Org.:
 USDOE Office of Energy Research (ER) (US)
 OSTI Identifier:
 790262
 Report Number(s):
 JLABTHY9748; DOE/ER/401501981; nuclth/9701058; IUNTC9617
TRN: US0200413
 DOE Contract Number:
 FG0287ER40365; AC0584ER40150
 Resource Type:
 Journal Article
 Resource Relation:
 Journal Name: Int.J.Mod.Phys.E6:515631,1997; Other Information: Journal preprint submitted to Int.J.Mod.Phys.E6:515631,1997; PBD: 1 Jan 1997
 Country of Publication:
 United States
 Language:
 English
 Subject:
 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; HADRONS; QUANTUM MECHANICS; BARYONS; LAGRANGIAN FUNCTION; MANYBODY PROBLEM; MEANFIELD THEORY; MESONS; NUCLEAR STRUCTURE; TRANSPORT THEORY; WEAK INTERACTIONS
Citation Formats
John Dirk Walecka, Brian D. Serot. Recent Progress in Quantum Hadrodynamics. United States: N. p., 1997.
Web.
John Dirk Walecka, Brian D. Serot. Recent Progress in Quantum Hadrodynamics. United States.
John Dirk Walecka, Brian D. Serot. Wed .
"Recent Progress in Quantum Hadrodynamics". United States.
doi:. https://www.osti.gov/servlets/purl/790262.
@article{osti_790262,
title = {Recent Progress in Quantum Hadrodynamics},
author = {John Dirk Walecka, Brian D. Serot},
abstractNote = {Quantum hadrodynamics (QHD) is a framework for describing the nuclear manybody problem as a relativistic system of baryons and mesons. Motivation is given for the utility of such an approach and for the importance of basing it on a local, Lorentzinvariant lagrangian density. Calculations of nuclear matter and finite nuclei in both renormalizable and nonrenormalizable, effective QHD models are discussed. Connections are made between the effective and renormalizable models, as well as between relativistic meanfield theory and more sophisticated treatments. Recent work in QHD involving nuclear structure, electroweak interactions in nuclei, relativistic transport theory, nuclear matter under extreme conditions, and the evaluation of loop diagrams is reviewed.},
doi = {},
journal = {Int.J.Mod.Phys.E6:515631,1997},
number = ,
volume = ,
place = {United States},
year = {Wed Jan 01 00:00:00 EST 1997},
month = {Wed Jan 01 00:00:00 EST 1997}
}

Using the realtime Green'sfunction method with a paircutoff approximation up to second order, the thermodynamical fluctuation effects of meson fields on the QHDII model are studied. We find that the fluctuation effects of meson fields, in particular, the [pi] meson field, on saturation energy, effective mass of nucleon, and pressure are remarkable in the lowdensity region and/or hightemperature region. The results given by the QHDI and QHDII models are compared. The value of the critical point of the liquidgas phase transition for the QHDII model is given.

Coulomb instability of hot nuclei in quantum hadrodynamics
Meanfield theory of quantum hadrodynamics is used to study the Coulomb instability of asymmetric nuclear matter at finite temperature. The critical temperature for the liquidgas phase transition in nuclear matter and its dependence on an asymmetry parameter are calculated. The limiting temperature [ital T][sub lim], which reflects the Coulomb instability of hot nuclei is studied. 
Relativistic hydrodynamics with quantum hadrodynamics equation of state
We derive the equation of state of the quantum hydrodynamics Lagrangian in a classical approach. The obtained equation of state is then used as input in a relativistic hydrodynamical numerical routine. Rapidity and transverse momentum distributions are calculated and compared with experimental data on heavy ion collisions obtained at the Brookhaven National Laboratory Alternating Gradient Synchrotron and the CERN Super Proton Synchrotron. 
Fluctuation effects of meson fields on quantum hadrodynamics at finite temperature
By means of the realtime Green's functions method with a pair cutoff approximation up to the second order, the thermal fluctuation effects of meson fields on quantum hadrodynamics are investigated. We find that the fluctuation effects of saturation energy, effective mass of nucleon, and the pressure are considerable in low baryon density regions and/or high temperature regions. The results given by pair cutoff theory and by mean field theory are compared. 
Lattice quantum hadrodynamics
Quantum corrections to the meanfield equation of state for nuclear matter are estimated in a lattice simulation of quantum hadrodynamics. In contrast with the standard coordinatespace methods used in lattice QCD, the calculations are carried out here in momentum space and on nonhypercubic (irregular) lattices. The quantum corrections to the known meanfield equation of state were found to be considerable.