Zobrazeno 1 - 10
of 549
pro vyhledávání: '"Nardelli, G."'
Publikováno v:
JHEP0503:079,2005
We present a new analytic time dependent solution of cubic string field theory at the lowest order in the level truncation scheme. The tachyon profile we have found is a bounce in time, a $C^{\infty}$ function which represents an almost exact solutio
Externí odkaz:
http://arxiv.org/abs/hep-th/0502151
Publikováno v:
JHEP 0403:030,2004
We compute, on the disk, the non-linear tachyon $\beta$-function, $\beta^T$, of the open bosonic string theory. $\beta^T$ is determined both in an expansion to the third power of the field and to all orders in derivatives and in an expansion to any p
Externí odkaz:
http://arxiv.org/abs/hep-th/0402167
Publikováno v:
Phys.Rev. D66 (2002) 085012
Commutative Yang-Mills theories in 1+1 dimensions exhibit an interesting interplay between geometrical properties and U(N) gauge structures: in the exact expression of a Wilson loop with $n$ windings a non trivial scaling intertwines $n$ and $N$. In
Externí odkaz:
http://arxiv.org/abs/hep-th/0205210
Publikováno v:
Nucl.Phys. B617 (2001) 308-320
We perform a perturbative ${\cal O}(g^4)$ Wilson loop calculation for the U(N) Yang-Mills theory defined on non-commutative one space - one time dimensions. We choose the light-cone gauge and compare the results obtained when using the Wu-Mandelstam-
Externí odkaz:
http://arxiv.org/abs/hep-th/0107147
Publikováno v:
JHEP 0107:008,2001
We study the perturbative unitarity of non-commutative quantum Yang-Mills theories, extending previous investigations on scalar field theories to the gauge case where non-locality mingles with the presence of unphysical states. We concentrate our eff
Externí odkaz:
http://arxiv.org/abs/hep-th/0105257
Autor:
Nardelli, G., Peloso, M.
Publikováno v:
Nucl.Phys. B567 (2000) 583-601
The partition function of a two dimensional Abelian gauge model reproducing magnetic vortices is discussed in the harmonic approximation. Classical solutions exhibit conformal invariance, that is broken by statistical fluctuations, apart from an exce
Externí odkaz:
http://arxiv.org/abs/hep-th/9912087
Publikováno v:
Phys.Rev. D59 (1999) 125005
We calculate in dimensions $D=2+\epsilon$ and in light-cone gauge (LCG) the perturbative ${\cal O}(g^4)$ contribution to a rectangular Wilson loop in the (t,x)-plane coming from diagrams with a self-energy correction in the vector propagator. In the
Externí odkaz:
http://arxiv.org/abs/hep-th/9904061
Publikováno v:
Nucl.Phys. B534 (1998) 491-512
A rectangular Wilson loop centered at the origin, with sides parallel to space and time directions and length $2L$ and $2T$ respectively, is perturbatively evaluated ${\cal O}(g^4)$ in Feynman gauge for Yang--Mills theory in $1+(D-1)$ dimensions. Whe
Externí odkaz:
http://arxiv.org/abs/hep-th/9806190
Autor:
Bassetto, A., Nardelli, G.
Publikováno v:
Phys.Rev. D57 (1998) 2628-2630
Classical vacuum - pure gauge - solutions of Euclidean two-dimensional SU(2) Yang-Mills theories are studied. Topologically non-trivial vacua are found in a class of gauge group elements isomorphic to $S_2$. These solutions are unexpectedly related t
Externí odkaz:
http://arxiv.org/abs/hep-th/9711187
Publikováno v:
Phys.Rev. D56 (1997) 3631-3645
The Schwinger model, defined in the space interval $-L \le x \le L$, with (anti)periodic boundary conditions, is canonically quantized in the light-cone gauge $A_-=0$ by means of equal-time (anti)commutation relations. The transformation diagonalizin
Externí odkaz:
http://arxiv.org/abs/hep-th/9707137