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6 papers · 1 filter
Closed time like curve and the energy condition in 2+1 dimensional gravity
P. Menotti, D. Seminara
We consider gravity in 2+1 dimensions in presence of extended stationary sources with rotational symmetry. We prove by direct use of Einstein's equations that if i) the energy mome…
Possible Failure of Asymptotic Freedom in Two-Dimensional and -Models
S. Caracciolo, R. G. Edwards, A. Pelissetto +1
We have simulated the two-dimensional and -models, at correlation lengths up to about 220 (resp.\ 30), using a Wolff-type embedding algorithm. We see no evidence o…
The radial gauge propagators in quantum gravity
P. Menotti, G. Modanese, D. Seminara
We give a general procedure for extracting the propagators in gauge theories in presence of a sharp gauge fixing and we apply it to derive the propagators in quantum gravity in the…
Radiative Correction Effects of a Very Heavy Top
Riccardo Barbieri, Matteo Beccaria, Paolo Ciafaloni +2
If the top is very heavy, m_t >> M_Z, the dominant radiative correction effects in all electroweak precision tests can be exactly characterized in terms of two quantities, the rho-…
Wolff-Type Embedding Algorithms for General Nonlinear -Models
Sergio Caracciolo, Robert G. Edwards, Andrea Pelissetto +1
We study a class of Monte Carlo algorithms for the nonlinear -model, based on a Wolff-type embedding of Ising spins into the target manifold . We argue heuristically that, at…
Dynamic Critical Behaviour of Wolff's Algorithm for -Models
S. Caracciolo, R. G. Edwards, A. Pelissetto +1
We study the performance of a Wolff-type embedding algorithm for -models. We find that the algorithm in which we update the embedded Ising model à la Swendsen-Wang has cr…