Search results for "Computational physics"
showing 10 items of 725 documents
oneloop 2.0 — A program package calculating one-loop integrals
2019
Abstract We present an improved version of our program package oneloop which — written as a package for MAPLE (Char, Geddes, Gonnet, Leong, Monagan, Watt, MAPLE V Language and Library Reference Manuals) — solves one-loop Feynman integrals. The package is calculating one-, two- and three-point functions both algebraically and numerically to any tensor rank. In addition to the original version, oneloop 2.0 also calculates infrared divergent integrals. Higher powers of propagator terms and the O(ε) parts... Title of program: oneloop.ma, version 2.0 Catalogue Id: ACVW_v2_0 [ADGT] Nature of problem The theoretical determination of cross sections in particle processes requires the calculation of …
QQ-onia package: a numerical solution to the Schrödinger radial equation for heavy quarkonium
2019
Abstract This paper presents the basics of the QQ-onia package, a software based upon the Numerov O (h^6 ) method which can be used to solve the Schrödinger radial equation using a suitable potential V (r) for the heavy quarkonium system. This package also allows the analysis of relevant properties of those resonances such as the square of the wave functions at the origin, their corresponding derivatives for l ≠ 0 states, typical heavy-quark velocities, and mean square radii. Besides, it includes a to... Title of program: QQ-onia package Catalogue Id: AECQ_v1_0 Nature of problem Software to solve the Schrödinger radial equation using a suitable potential V (r) for the heavy quarkonium syste…
anQCD: Fortran programs for couplings at complex momenta in various analytic QCD models
2019
Abstract We provide three Fortran programs which evaluate the QCD analytic (holomorphic) couplings _(Aν)(^(Q2)) for complex or real squared momenta ^(Q2). These couplings are holomorphic analogs of the powers a(^(Q2))ν of the underlying perturbative QCD (pQCD) coupling a(^(Q2))≡_(αs)(^(Q2))/π, in three analytic QCD models (anQCD): Fractional Analytic Perturbation Theory (FAPT), Two-delta analytic QCD (2δanQCD), and Massive Perturbation Theory (MPT). The index ν can be noninteger. The pro... Title of program: AanQCDext Catalogue Id: AEYK_v1_0 Nature of problem Calculation of values of the running analytic couplings A ν (Q 2 ;N f ) for general complex squared momenta Q 2 === -q 2 , in three a…
FlexibleSUSY—A spectrum generator generator for supersymmetric models
2019
This program has been imported from the CPC Program Library held at Queen's University Belfast (1969-2018) Abstract We introduce FlexibleSUSY, a Mathematica and C++ package, which generates a fast, precise C++ spectrum generator for any SUSY model specified by the user. The generated code is designed with both speed and modularity in mind, making it easy to adapt and extend with new features. The model is specified by supplying the superpotential, gauge structure and particle content in a SARAH model file; specific boundary conditions e.g. at the GUT, weak or intermediate scales are defined in a separate F... Title of program: FlexibleSUSY Catalogue Id: AEVI_v1_0 Nature of problem Determini…
Imaginary time propagation code for large-scale two-dimensional eigenvalue problems in magnetic fields
2019
This program has been imported from the CPC Program Library held at Queen's University Belfast (1969-2018) Abstract We present a code for solving the single-particle, time-independent Schrödinger equation in two dimensions. Our program utilizes the imaginary time propagation (ITP) algorithm, and it includes the most recent developments in the ITP method: the arbitrary order operator factorization and the exact inclusion of a (possibly very strong) magnetic field. Our program is able to solve thousands of eigenstates of a two-dimensional quantum system in reasonable time with commonly available hardware. Th... Title of program: itp2d Catalogue Id: AENR_v1_0 Nature of problem Numerical calcul…
Vbfnlo: A parton level Monte Carlo for processes with electroweak bosons
2019
This program has been imported from the CPC Program Library held at Queen's University Belfast (1969-2018) Abstract Vbfnlo is a fully flexible parton level Monte Carlo program for the simulation of vector boson fusion, double and triple vector boson production in hadronic collisions at next-to-leading order in the strong coupling constant. Vbfnlo includes Higgs and vector boson decays with full spin correlations and all off-shell effects. In addition, Vbfnlo implements CP-even and CP-odd Higgs boson via gluon fusion, associated with two jets, at the leading-order one-loop level with the full top- a... Title of program: VBFNLO Catalogue Id: AEDO_v1_0 Nature of problem To resolve the large sc…
Pair potential calculation of molecular associations: a vectorized version
2019
Abstract The program AMYRVF is a vectorized and largely modified version of a previous program called AMYR for calculating molecular associations by means of Fraga's pair-wise atom-atom potential. Three new minimization procedures have been implemented as well as other improvements such as the inclusion of new pair-wise dispersion energy terms with damping functions, and the calculation of topological indices. Benchmark tests have been carried out on an IBM 3090 150E VF; the timings for the new vector... Title of program: AMYRVF Catalogue Id: ACBG_v1_0 Nature of problem This program determines the optimum separation and relative orientation of two interacting molecular systems through a min…
AMYR 2: A new version of a computer program for pair potential calculation of molecular associations
2019
Abstract AMYR is a computer program for the calculation of molecular associations using Fraga's pairwise atom - atom potential. The interaction energy is evaluated through a 1/R expansion. The electrostatic energy is calculated through either the one-centre-per atom or the three-centres-per atom model by Hunter and Sanders. A pairwise dispersion energy term is included in the potential and corrected by a damping function. The program carries out energy minimizations through variable metric methods. Th... Title of program: AMYR 2 Catalogue Id: ADIW_v1_0 Nature of problem The program determines the optimum separation and relative orientation of two interacting molecular systems through a mini…
Solution of self-consistent equations for the N3LO nuclear energy density functional in spherical symmetry. The program hosphe (v1.02)
2019
Abstract We present solution of self-consistent equations for the N^3 LO nuclear energy density functional. We derive general expressions for the mean fields expressed as differential operators depending on densities and for the densities expressed in terms of derivatives of wave functions. These expressions are then specified to the case of spherical symmetry. We also present the computer program hosphe (v1.02), which solves the self-consistent equations by using the expansion of single-particle wave... Title of program: HOSPHE (v1.02) Catalogue Id: AEGK_v1_0 Nature of problem The nuclear mean-field methods constitute principal tools of a description of nuclear states in heavy nuclei. With…
Axially deformed solution of the Skyrme-Hartree–Fock–Bogoliubov equations using the transformed harmonic oscillator basis (II) hfbtho v2.00d: A new v…
2019
This program has been imported from the CPC Program Library held at Queen's University Belfast (1969-2018) Abstract We describe the new version 2.00d of the code hfbtho that solves the nuclear Skyrme-Hartree–Fock (HF) or Skyrme-Hartree–Fock–Bogoliubov (HFB) problem by using the cylindrical transformed deformed harmonic oscillator basis. In the new version, we have implemented the following features: (i) the modified Broyden method for non-linear problems, (ii) optional breaking of reflection symmetry, (iii) calculation of axial multipole moments, (iv) finite temperature formalism for the HFB method, (v) li... Title of program: HFBTHO v2.00d Catalogue Id: ADUI_v2_0 Nature of problem The solu…