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Vertex Intersection Graphs of Paths on a Grid: Characterization Within Block Graphs
(Springer Tokyo, 2017-07)
We investigate graphs that can be represented as vertex intersections of horizontal and vertical paths in a grid, the so called B0-VPG graphs. Recognizing this class is an NP-complete problem. Although, there exists a ...
Pure spinor vertex operators in Siegel gauge and loop amplitude regularization
(Int School Advanced Studies, 2009-07-01)
Since the b ghost in the pure spinor formalism is a composite operator depending on non-minimal variables, it is not trivial to impose the Siegel gauge condition b(0)V = 0 on BRST-invariant vertex operators. Using the ...
Pure spinor vertex operators in Siegel gauge and loop amplitude regularization
(Int School Advanced Studies, 2009-07-01)
Since the b ghost in the pure spinor formalism is a composite operator depending on non-minimal variables, it is not trivial to impose the Siegel gauge condition b(0)V = 0 on BRST-invariant vertex operators. Using the ...
The omega DD vertex in a sum rule approach
(Elsevier B.V., 2007-01-18)
The study of charmonium dissociation in heavy ion collisions is generally performed in the framework of effective Lagrangians with meson exchange. Some studies are also developed with the intention of calculate form factors ...
The omega DD vertex in a sum rule approach
(Elsevier B.V., 2007-01-18)
The study of charmonium dissociation in heavy ion collisions is generally performed in the framework of effective Lagrangians with meson exchange. Some studies are also developed with the intention of calculate form factors ...
A construction of integrated vertex operator in the pure spinor sigma-model in AdS(5) x S-5
(Springer, 2013-11-14)
Vertex operators in string theory me in two varieties: integrated and unintegrated. Understanding both types is important for the calculation of the string theory amplitudes. The relation between them is a descent procedure ...
Half-BPS vertex operators of the AdS5 × S5 superstring
(2019-07-01)
Using the pure spinor formalism for the superstring in an AdS5 × S5 background, a simple expression is found for half-BPS vertex operators. At large radius, these vertex operators reduce to the usual supergravity vertex ...
Exact Algorithms for the Vertex Separator Problem in Graphs
(Wiley-blackwellMaldenEUA, 2011)
Addendum to “Vertex adjacencies in the set covering polyhedron” [Discrete Appl. Math. 218 (2017) 40–56]
(Elsevier Science, 2018-07)
We study the relationship between the vertices of an up-monotone polyhedron R and those of the polytope P obtained by truncating R with the unit hypercube. When R has binary vertices, we characterize the vertices of P in ...