| 1. |
- Ambjørn, J., et al.
(författare)
-
Stochastic confinement and dimensional reduction. (I). Four-dimensional SU(2) lattice gauge theory
- 1984
-
Ingår i: Nuclear Physics, Section B. - : Elsevier BV. - 0550-3213. ; 240:2, s. 189-212
-
Tidskriftsartikel (refereegranskat)abstract
- By Monte Carlo calculations on a 124 lattice we investigate four-dimensional SU(2) lattice gauge theory with respect to the conjecture that at large distances this theory reduces approximately to two-dimensional SU(2) lattice gauge theory. We find good numerical evidence for this conjecture. As a by-product we also measure the SU(2) string tension and find reasonable agreement with scaling. The "adjoint string tension" is also found to have a reasonable scaling behaviour.
|
|
| 2. |
- Ambjørn, J., et al.
(författare)
-
Stochastic confinement and dimensional reduction (II). Three-dimensional SU(2) lattice gauge theory
- 1984
-
Ingår i: Nuclear Physics, Section B. - : Elsevier BV. - 0550-3213. ; 240:4, s. 533-542
-
Tidskriftsartikel (refereegranskat)abstract
- We study 3-dimensional SU(2) lattice gauge theory with respect to dimensional reduction. By Monte Carlo calculations we find that this reduction is valid to a good approximation (within ≈10%). The adjoint string tension is found to scale approximately. We also compare the adjoint string tension with a string theory.
|
|
| 3. |
- Ambjørn, J., et al.
(författare)
-
The complex langevin equation and Monte Carlo simulations of actions with static charges
- 1986
-
Ingår i: Nuclear Physics, Section B. - 0550-3213. ; 275:3, s. 375-397
-
Tidskriftsartikel (refereegranskat)abstract
- We explore the possibilities of using the complex Langevin equation to Monte Carlo generate configurations of gauge theories with static charges present in the action. Successful results are obtained for systems that possess nontrivial saddle-point (classical) solutions. For that reason the algorithm works impressively for two-dimensional U(1) in the entire β-range whereas for three- and four-dimensional U(1) the applicability is limited to the weak coupling regime (large β). The method fails completely for SU(2) and SU(3).
|
|
| 4. |
- Ambjørn, J., et al.
(författare)
-
Three-dimensional lattice gauge theory and strings
- 1984
-
Ingår i: Nuclear Physics, Section B. - : Elsevier BV. - 0550-3213. ; 244:1, s. 262-276
-
Tidskriftsartikel (refereegranskat)abstract
- We consider SU(2) lattice gauge theory in three dimensions. The Wilson loops are found to be well described by a simple string model in the approximate scaling region.
|
|
| 5. |
|
|
| 6. |
|
|
| 7. |
|
|
| 8. |
- Bengtsson, Mats, et al.
(författare)
-
QCD effects on the event structure in leptoproduction
- 1988
-
Ingår i: Nuclear Physics, Section B. - : Elsevier BV. - 0550-3213. ; 301:4, s. 554-582
-
Tidskriftsartikel (refereegranskat)abstract
- Perturbative QCD corrections to leptoproduction events can be introduced either in the form of matrix elements or of parton showers. Each of these approaches has its advantages and disadvantages, making a comparison of the two interesting. At present energies, both methods can be made to agree reasonably well with data, whereas differences appear at higher energies. The influence of these QCD effects on the expected event structure at ep colliders, HERA in particular, is investigated in detail. This includes multiplicity and momentum distributions, transverse momentum flow and correlations, as well as jet properties.
|
|
| 9. |
- Coste, Antoine, et al.
(författare)
-
Finite Size Effects and Twisted Boundary Conditions
- 1987
-
Ingår i: Nuclear Physics B. - : Elsevier BV. - 0550-3213. ; 287, s. 569-588
-
Tidskriftsartikel (refereegranskat)abstract
- We explore the possibility of reducing finite size effects in the weak coupling region of glueball correlations and Wilson loops. Our analysis indicates that twisted boundary conditions do diminish finite size effects and numerical evidence for this is given for the glueball correlation.
|
|
| 10. |
- Flensburg, M., et al.
(författare)
-
String model potentials and lattice gauge theories
- 1987
-
Ingår i: Nuclear Physics, Section B. - : Elsevier BV. - 0550-3213. ; 283, s. 141-164
-
Tidskriftsartikel (refereegranskat)abstract
- The static potentials from bosonic string models are examined to the two-loop level. Available MC data for 4-dimensional SU(3) are in approximate agreement with the universal leading order predictions but fail to reproduce the Nambu string when the two-loop terms are included in the analysis. We also confront Nambu string model predictions for Tc σ with SU(2), SU(3) and SU(N → ∞) MC data. In the SU(2) case, impressive agreement is found both in 3 and 4 dimensions. In contrast, the data for SU(3) and SU(N → ∞) differ from the string model prediction. These theories have identical values for Tc σ, indicating that N → ∞ is a good approximation to N = 3.
|
|
