scholarly journals Algebraic renormalization of twisted N=2 supersymmetry with Z=2 central extension

2001 ◽  
Vol 616 (3) ◽  
pp. 437-475 ◽  
Author(s):  
B. Geyer ◽  
D. Mülsch
Keyword(s):  
Central Extension

scholarly journals A note on central group extensions

1973 ◽  
Vol 15 (4) ◽  
pp. 428-429 ◽  
Author(s):  
G. J. Hauptfleisch
Keyword(s):  
Abelian Group ◽  
Homomorphic Image ◽  
Free Group ◽  
Central Extension ◽  
Dihedral Group ◽  
Group Extension ◽  
Central Group ◽  
Group Extensions

If A, B, H, K are abelian group and φ: A → H and ψ: B → K are epimorphisms, then a given central group extension G of H by K is not necessarily a homomorphic image of a group extension of A by B. Take for instance A = Z(2), B = Z ⊕ Z, H = Z(2), K = V4 (Klein's fourgroup). Then the dihedral group D8 is a central extension of H by K but it is not a homomorphic image of Z ⊕ Z ⊕ Z(2), the only group extension of A by the free group B.

scholarly journals Central Extension of Quadratic Lie Algebras and Its Relation to Dihedral Homology

1996 ◽  
Vol 180 (3) ◽  
pp. 725-756
Author(s):  
Guillermo Cortiñas ◽  
Jack M. Shapiro
Keyword(s):  
Lie Algebras ◽  
Central Extension ◽  
Dihedral Homology

A Lax representation for the vertex operator and the central extension

1995 ◽  
Vol 171 (3) ◽  
pp. 547-588 ◽  
Author(s):  
M. Adler ◽  
T. Shiota ◽  
P. van Moerbeke
Keyword(s):  
Vertex Operator ◽  
Central Extension ◽  
Lax Representation

scholarly journals Interacting vacuum at infinity

2019 ◽  
Vol 16 (04) ◽  
pp. 1950052
Author(s):  
G. Kittou
Keyword(s):  
Finite Time ◽  
Central Extension ◽  
Vacuum Model ◽  
Time Singularity ◽  
Attractor Solution ◽  
The One ◽  
Finite Time Singularity

We apply the central extension technique of Poincaré to dynamics involving an interacting mixture of pressureless matter and vacuum near a finite-time singularity. We show that the only attractor solution on the circle of infinity is the one describing a vanishing matter-vacuum model at early times.

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