7.1k citations
- Centre National de la Recherche ScientifiqueFR487 papers
- Rutherford Appleton LaboratoryGB324 papers
- Royal ObservatoryGB279 papers
- California Institute of TechnologyUS257 papers
- Leiden UniversityNL256 papers
- European Southern ObservatoryCL255 papers
- University of OxfordGB241 papers
- University of HertfordshireGB229 papers
- Instituto de Astrofísica de CanariasES227 papers
- University of EdinburghGB227 papers
- National Institute for AstrophysicsIT221 papers
- Cardiff UniversityGB216 papers
Showing 1995Show all
3 papers · 1 filter
quant-ph1995★ 44 cited
Reconstructing the density operator via simple projectors
Ole Steuernagel, John A. Vaccaro
We describe the representation of arbitrary density operators in terms of expectation values of simple projection operators. Two representations are presented which yield non--recu…
hep-ph1995★ 58 cited
Unknotting the polarized vacuum of quenched QED
D. J. Broadhurst, R. Delbourgo, D. Kreimer
A knot-theoretic explanation is given for the rationality of the quenched QED beta function. At the link level, the Ward identity entails cancellation of subdivergences generated b…
hep-ph1995★ 127 cited
Knots and Numbers in Theory to 7 Loops and Beyond
D. J. Broadhurst, D. Kreimer
We evaluate all the primitive divergences contributing to the 7--loop \/--function of theory, i.e.\ all 59 diagrams that are free of subdivergences and hence give scheme--…