AppTemp

From HP-SEE Wiki

Contents 1 General Information 2 Short Description 3 Problems Solved 4 Scientific and Social Impact 5 Collaborations 6 Beneficiaries 7 Number of users 8 Development Plan 9 Resource Requirements 10 Technical Features and HP-SEE Implementation 11 Usage Example 12 Infrastructure Usage 13 Running on Several HP-SEE Centres 14 Achieved Results 15 Publications 16 Foreseen Activities

General Information

• Application's name: Hadron Masses from Lattice QCD
• Application's acronym: HMLQCD
• Virtual Research Community: VRC "TirLatt Group"
• Scientific contact: Prof. Artan Boriçi (artanborici@yahoo.com)
• Technical contact: Msc. Dafina Xhako, (dafinaxhako@yahoo.com); Msc. Rudina Zeqirllari, (rudina_mj@hotmail.com)
• Developers:
• Web site: ...

Short Description

Computation of basic properties of matter simulating the theory of strong interactions, Quantum Chromodynamic on the Lattice on massively parallel computers.

In lattice QCD, fields representing quarks are defined at lattice sites (which leads to fermion doubling), while the gluon fields are defined on the links connecting neighboring sites. This approximation approaches continuum QCD as the spacing between lattice sites is reduced to zero. Because the computational cost of numerical simulations can increase dramatically as the lattice spacing decreases, results are often extrapolated to Failed to parse (Missing texvc executable; please see math/README to configure.): a=0 by repeated calculations at different lattice spacings a that are large enough to be tractable. Numerical lattice QCD calculations using Monte Carlo methods can be extremely computationally intensive, requiring the use of the largest available supercomputers. To reduce the computational burden, the so-called quenched approximation can be used, in which the quark fields are treated as non-dynamic "frozen" variables. While this was common in early lattice QCD calculations, "dynamical" fermions are now standard. These simulations typically utilize algorithms based upon molecular dynamics or microcanonical ensemble algorithms.

The project foresees three phases: 1. Simulation of lattice QCD with O(a) improved fermions, ie w/ chiral fermions using the FERMIQCD software 2. Implementation of Borici-Creutz fermions: - Gauge and fermions action implementation - Dirac solver 3. Simulation with Borici-Creutz fermions

Problems Solved

• Calculation of quark propagators
• Calculation of hadron propagators
• Calculation of hadron masses
• Calculation of quark propagators using multigrid algorithm

Scientific and Social Impact

Accurate calculations of hadron spectrum

Collaborations

Beneficiaries

• Researchers in the field of computational physics in Lattice QCD.

Number of users

3

Development Plan

• Concept: Done before the project started
• Start of alpha stage: Done before the project started
• Start of beta stage: M9
• Start of testing stage:M11
• Start of deployment stage: M15
• Start of production stage: M16

Resource Requirements

• Number of cores required for a single run:
• Minimum RAM/core required:
• Storage space during a single run:
• Total core hours required:

Technical Features and HP-SEE Implementation

• Primary programming language: C++
• Parallel programming paradigm: MPI/OpenMP
• Main parallel code: MPI
• Pre/post processing code: Own developer
• Application tools and libraries: FermiQCD

Usage Example

...

Infrastructure Usage

Running on Several HP-SEE Centres

Achieved Results

...

Publications

• ...

Foreseen Activities

• ...
• ...