All Questions
Tagged with quantum-chromodynamics lattice-model
27
questions
14
votes
2
answers
2k
views
Why Does Lattice QCD Use Heavier Than Physical Masses For Calculations?
It is common place (e.g. here), for Lattice QCD calculations to be computed using reference masses (such as the pion mass) which are greater that the physical values of those quantities.
Sometimes, ...
- 3,957
9
votes
0
answers
368
views
Lattice QCD and the 5th dimension
I was digging into the Nielsen-Ninomiya Theorem and doubler fermions, as well as solutions to these problems using Domain Wall Fermions and overlap lattice fermions, both of which make effective use ...
- 99
7
votes
1
answer
217
views
What makes lattice QCD computationally tractable?
I don't know anything about lattice QCD. Therefore, at first glance it seems to me that lattice QCD should be computationally intractable for all practical purposes.
Let's assume that we only care ...
- 6,611
6
votes
1
answer
486
views
Lattice spacing in lattice QCD
It is known that the lattice spacing in lattice QCD is not an external parameter and needs to be calculated, also the lattice beta parameter scales the lattice spacing ($a$) and goes as a function of ...
- 343
5
votes
1
answer
543
views
Is quark and gluon orbital angular momentum predicted to have the rest of the proton's spin?
The Phys.org news item How did the proton get its spin? outlines various experiments that probe proton structure and are sensitive to spin, and the current news is that CEBAF's major energy upgrade ...
- 6,273
5
votes
1
answer
223
views
Continuum of lattice QCD is free?
I am having a hard time getting to grips with the statement that
$$g_{0}(a) \to 0 \text{ as } a \to 0$$
where $g_{0}$ is the bare coupling in lattice QCD and $a$ the lattice spacing.
How come this ...
- 609
5
votes
1
answer
268
views
What observable is visualized in lattice QCD visualizations?
I have seen a couple of visualizations of lattice QCD, for instance the images by Derek Leinweber. Using my own data I would like to make similar visualizations. I am just not sure what I actually see ...
- 8,439
5
votes
1
answer
168
views
Temperature-dependence of quark potential in Abelian lattice gauge theory
I am working with Kapusta's "Finite-Temperature Field Theory" textbook, and am working through the first part of chapter 10. When building the correlator of the two quarks a distance $R$ apart in the ...
- 2,665
4
votes
1
answer
1k
views
Lattice QCD and string theory
I've heard the claim that some aspects of string theory are used to improve Monte-Carlo simulations of lattice QCD, for example by people working at the LHC.
I know a bit about Monte-Carlo methods in ...
- 3,735
4
votes
1
answer
266
views
Real time lattice simulation
A typical simulation of lattice quantum chromodynamics uses imaginary time, so the weight function of the path integral is positive definite $e^{-S_E}$.
In the case of metropolis-hastings, the ...
- 343
4
votes
1
answer
235
views
Has confinement been experimentally observed? [closed]
So, confinement has obviously been shown by lattice gauge theory to be a predicted aspect of QCD. However, to what extent has it been observed in experimental physics?
- 169
3
votes
1
answer
1k
views
Recommend books for learning lattice QCD
I want to learn lattice QCD by myself, but I don't know how to start. Can you recommend some books for lattice QCD?
3
votes
1
answer
171
views
What is the effect of including additional representations in the action of a lattice gauge theory?
I'm reading Introduction to Quantum Fields on a Lattice by Jan Smit. When introducing the lattice gauge-field action as a sum over plaquettes, Smit says that in general the action should include a sum ...
- 223
3
votes
3
answers
151
views
Are there new physics scenarios that predict low lying hadrons?
There is a significant ongoing experimental effort to search for new hadrons with masses in the GeV range. This is used to find the spectra of QCD bound states, with a particular emphasis on finding ...
- 8,995
2
votes
1
answer
75
views
Are gravitons equivalent to extra localised lattice points?
So imagine space is a regular square mesh or lattice. In a theory like QCD, the photon lines are placed along the edges of this graph to form paths.
The space is supposed to represent simple ...
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