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
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
1
vote
1
answer
269
views
Lattice QFT: Non-homogenous lattice spacing
I am interested why we fix the lattice spacing, $a$ to be homogenous in all dimensions. After a Wick rotation, $a=i \epsilon$ where $\epsilon=t_{i+1} - t_{i}$ and with euclidean time given by $\tau = ...
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
1
vote
0
answers
55
views
Obtaining the correlator of harmonic oscillator
The two point function for harmonic oscillator can be written as
$$\langle \langle x(t_1)x(t_2) \rangle \rangle =\frac{\int Dx(t) x(t_1)x(t_2) e^{-S(x)}}{\int Dx(t) e^{-S(x)}} \tag{21} \, .$$
In ...
- 185
0
votes
1
answer
125
views
How to calculate thd average of a Wilson loop in LQCD?
I'm am trying to do the excercise in page 35 from Lepage's LQCD notes: http://arxiv.org/abs/hep-lat/0506036.
I want to compute the thermal average of the Wilson loop of size $a\times a$, where $a$ is ...
- 12.5k
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
1
vote
1
answer
195
views
Is it possible to calculate neutron half-life theoretically?
Is it possible to calculate neutron half-life theoretically? For example, from lattice QCD or something?
- 1,732
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
1
vote
1
answer
75
views
Construction of Bound states in Lattice QCD
How the proton state is found and renormalized in lattice QCD? Is there any literature shows the method step by step? What about other bound states in QCD if we somehow know their quantum numbers?
- 631
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
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