SOLVING THE MYSTERIES OF PARTICLE PHYSICS WITH GPUS Waseem Kamleh GPU Technology Conference April 4-7, 2016 Silicon Valley, California
IBM ASCI WHITE #1 November 2000 4.9 Teraflops (DP) 3000 kW 188 Billion Transistors
NVIDIA TESLA K80 2.9 Teraflops (DP) 0.3 kW 14 Billion Transistors
PHOENIX HPC @ University of Adelaide Lenovo NeXtScale 3840 Intel CPU cores; 144 Nvidia K80 GPUs; 15 TB of RAM; Mellanox EDR Infiniband; > 300 Teraflops.
SEMICONDUCTOR TECHNOLOGY
ATOMIC LATTICE Q UANTUM M ECHANICS Pauli Exclusion Principle
THE ATOM
THE PROTON Quarks Gluons M = 938 MeV
BARYON 3 quarks Half-integer spin Fermion J = 1/2
WHAT IS A GLUON?
FORCES ARE CARRIED BY PARTICLES
QUARK FLAVOURS Flavour Mass Charge up 3 MeV +2/3 down 5 MeV -1/3 strange 0.1 GeV -1/3 charm 1.2 GeV +2/3 bottom 4 GeV -1/3 top 173 GeV +2/3
ORIGIN OF MASS 3 + 3 + 5 = 938 MeV?
WHERE DOES THE OTHER 99% OF YOUR MASS COME FROM?
LATTICE QCD Sparse Matrices Key routines coded in CUDA
QCD VACUUM Monte Carlo gluon field configuration
QUARK MASS FUNCTION Dynamical mass generation
EMERGENT PHENOMENA “An emergent behavior or emergent property can appear when a number of simple entities (agents) operate in an environment, forming more complex behaviors as a collective .”
CENTRE VORTEX MODEL
MONTE CARLO GLUON FIELD
VORTEX REMOVED GLUON FIELD
VORTEX-ONLY GLUON FIELD
REMOVING VORTICES REMOVES MASS
VORTEX-ONLY FIELD REPRODUCES MASS FUNCTION
CENTRE VORTICES ARE THE ORIGIN OF DYNAMICAL MASS GENERATION
THE LAMBDA(1405) PUZZLE
u d u d s u N* (1535 MeV) Λ * (1405 MeV)
WHY IS THE LAMBDA(1405) SO LIGHT?
STRANGE MAGNETIC FORM FACTOR
u d s
PROBING THE STRUCTURE OF THE LAMBDA (1405)
The internal structure of the Lambda(1405) spontaneously reorganises at the lightest quark mass. LAMBDA(1405) MAGNETIC FORM FACTOR
SPIN UP SPIN DOWN QUARK SPIN POLARISATION
KAON Quark + antiquark Integer spin Meson M = 494 MeV
938 + 494 = 1432 MeV u d u s u ANTIKAON-NUCLEON MOLECULE
J = 0 J = 1/2
The kaon has zero orbital angular momentum and zero spin. The strange quark does not contribute to the magnetic form factor of the Λ(1405) when it is in a K N molecule. STRANGE MAGNETIC FORM FACTOR
As the simulation parameters describing the strange quark are held fixed, this is a remarkable environmental effect of unprecedented strength. LATTICE HAMILTONIAN MODEL
MODEL PREDICTS THE CORRECT MASS
The Lambda (1405) is a molecular bound state of an anti-kaon and a nucleon.
Using Lattice QCD and the computational power of GPUs we have resolved two long-standing mysteries of particle physics. Centre vortices are the fundamental objects responsible for dynamical mass generation. http://dx.doi.org/10.1103/PhysRevD.92.074507 http://dx.doi.org/10.1016/j.physletb.2015.06.025 The Lambda(1405) is an antikaon-nucleon molecule, explaining its anomalously light mass. http://dx.doi.org/10.1103/PhysRevLett.114.132002 THANK YOU!
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