| 1. |
- Ambjørn, J., et al.
(författare)
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Langevin simulations of configurations with static charges
- 1985
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Ingår i: Physics Letters B. - 0370-2693. ; 159:4-6, s. 335-340
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Tidskriftsartikel (refereegranskat)abstract
- By using the Langevin equation with complex action it is possible to generate (complex) configurations in the charged sector of gauge theories. We test the algorithm in the case of two-dimensional U(1) gauge theory and are able to measure the string tension with great precision and modest use of computer time for a separation of the charged particles where a conventional Wilson loop would have a value ≈ 10-10.
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| 2. |
- Ambjørn, J., et al.
(författare)
-
Observation of a string in three-dimensional SU(2) lattice gauge theory
- 1984
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Ingår i: Physics Letters B. - : Elsevier BV. - 0370-2693. ; 142:5-6, s. 410-414
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Tidskriftsartikel (refereegranskat)abstract
- SU(2) lattice gauge theory in three dimensions is investigated on a 162×32 lattice. We find that R>×T Wilson loops are well described by a simple string theory for β in the (approximate) scaling region.
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| 3. |
- Ambjørn, J., et al.
(författare)
-
Stochastic confinement and dimensional reduction. (I). Four-dimensional SU(2) lattice gauge theory
- 1984
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Ingår i: Nuclear Physics, Section B. - : Elsevier BV. - 0550-3213. ; 240:2, s. 189-212
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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.
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| 4. |
- Ambjørn, J., et al.
(författare)
-
Stochastic confinement and dimensional reduction (II). Three-dimensional SU(2) lattice gauge theory
- 1984
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Ingår i: Nuclear Physics, Section B. - : Elsevier BV. - 0550-3213. ; 240:4, s. 533-542
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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.
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| 5. |
- Ambjørn, J., et al.
(författare)
-
The complex langevin equation and Monte Carlo simulations of actions with static charges
- 1986
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Ingår i: Nuclear Physics, Section B. - 0550-3213. ; 275:3, s. 375-397
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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).
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| 6. |
- Ambjørn, J., et al.
(författare)
-
Three-dimensional lattice gauge theory and strings
- 1984
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Ingår i: Nuclear Physics, Section B. - : Elsevier BV. - 0550-3213. ; 244:1, s. 262-276
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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.
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| 7. |
- Mattsson, J, et al.
(författare)
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Intratumoral distribution of microspheres.
- 1986
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Ingår i: Anticancer research. - 0250-7005. ; 6:4, s. 563-6
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Tidskriftsartikel (refereegranskat)abstract
- Fifteen mu carbonized microspheres injected in two transplantable rat tumors, a hepatoma transplanted to the dorsum of one hindpaw and an adenocarcinoma transplanted into the liver, were found to be unevenly distributed and often in aggregates that seemed to fill intratumoral vessels. This finding can partly explain the increased vascular resistance in tumors after microsphere injection and makes the technique with repeated injections of microspheres disputable.
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| 8. |
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