Zobrazeno 1 - 10
of 212
pro vyhledávání: '"Nelson, J. E."'
Autor:
Rethwisch, Michael D., Berger, Lois, Griffin, Bradford J., Bradley, A., Reay, Mark, Nelson, J. E.
Fifteen insecticide treatments were applied March 12, 2001, to compare their efficacies on alfalfa weevils, western flower thrips, blue alfalfa aphids and associated aphid predators. Furadan and insecticides containing a pyrethroid active ingredient
Externí odkaz:
http://hdl.handle.net/10150/203853
Autor:
Nelson, J. E., Picken, R. F.
Publikováno v:
Modern Physics Letters A, Vol 33, 1 (2019) 1950256 (8 pages), World Scientific
Quantum holonomies of closed paths on the torus $T^2$ are interpreted as elements of the Heisenberg group $H_1$. Group composition in $H_1$ corresponds to path concatenation and the group commutator is a deformation of the relator of the fundamental
Externí odkaz:
http://arxiv.org/abs/1808.08812
Autor:
Nelson, J. E.
It gives me great pleasure to review some of the joint work by Tullio Regge and myself. We worked intensely on 2+1-dimensional gravity from 1989 for about five years, and published 16 articles. I will present and review two of our early articles, hig
Externí odkaz:
http://arxiv.org/abs/1804.08456
Autor:
Nelson, J. E., Picken, R. F.
We continue our investigation into intersections of closed paths on a torus, to further our understanding of the commutator algebra of Wilson loop observables in 2+1 quantum gravity, when the cosmological constant is negative. We give a concise revie
Externí odkaz:
http://arxiv.org/abs/1309.2187
Autor:
Nelson, J. E., Picken, R. F.
Publikováno v:
Gen.Rel.Grav.43:777-795,2011
Wilson observables for 2+1 quantum gravity with negative cosmological constant, when the spatial manifold is a torus, exhibit several novel features: signed area phases relate the observables assigned to homotopic loops, and their commutators describ
Externí odkaz:
http://arxiv.org/abs/1006.0921
Autor:
Nelson, J. E., Picken, R. F.
In the context of (2+1)--dimensional gravity, we use holonomies of constant connections which generate a $q$--deformed representation of the fundamental group to derive signed area phases which relate the quantum matrices assigned to homotopic loops.
Externí odkaz:
http://arxiv.org/abs/0903.4809
Autor:
Nelson, J. E., Picken, R. F.
Publikováno v:
J.Phys.A41:304011,2008
In the context of quantum gravity for spacetimes of dimension 2+1, we describe progress in the construction of a quantum Goldman bracket for intersecting loops on surfaces. Using piecewise linear paths in R^2 (representing loops on the spatial manifo
Externí odkaz:
http://arxiv.org/abs/0711.2271
Publikováno v:
Lett.Math.Phys. 78 (2006) 17-26
Using the Penner--Fock parameterization for Teichmuller spaces of Riemann surfaces with holes, we construct the string-like free-field representation of the Poisson and quantum algebras of geodesic functions in the continuous-genus limit. The mapping
Externí odkaz:
http://arxiv.org/abs/gr-qc/0510119
Autor:
Nelson, J. E., Picken, R. F.
We describe some results concerning the phase space of 3-dimensional Einstein gravity when space is a torus and with negative cosmological constant. The approach uses the holonomy matrices of flat SL(2,R) connections on the torus to parametrise the g
Externí odkaz:
http://arxiv.org/abs/math-ph/0501051
Autor:
Nelson, J. E., Picken, R. F.
Publikováno v:
Adv.Theor.Math.Phys. 9 (2005) 407-433
In the context of (2+1)--dimensional quantum gravity with negative cosmological constant and topology R x T^2, constant matrix--valued connections generate a q--deformed representation of the fundamental group, and signed area phases relate the quant
Externí odkaz:
http://arxiv.org/abs/math-ph/0412007