Wilson loops to 20th order numerical stochastic perturbation theory
نویسندگان
چکیده
منابع مشابه
Fermionic Loops in Numerical Stochastic Perturbation Theory
In recent years the Numerical implementation of Stochastic Perturbation Theory (NSPT) was introduced, which was able to reach unprecedented high orders in perturbative expansions in Lattice Gauge Theories (LGT). Till now the main limitation of the method has been the quenched approximation, an inclusion of fermionic loops contributions missing. We can now fill this gap. Let us first of all remi...
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At Lattice 2000 we discussed how to include fermionic loops contributions in Numerical Stochastic Perturbation Theory for Lattice SU(3), an algorithm which we will refer to as UNSPT (Unquenched NSPT). Our main message here is that unquenching NSPT results in not such a heavy computational overhead, provided only that an FFT can be implemented in a fairly efficient way. FFT is the main ingredien...
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We give a full account of the Numerical Stochastic Perturbation Theory method for Lattice Gauge Theories. Particular relevance is given to the inclusion of dynamical fermions, which turns out to be surprisingly cheap in this context. We analyse the underlying stochastic process and discuss the convergence properties. We perform some benchmark calculations and as a byproduct we present original ...
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Perturbative calculations in lattice field theories are necessary to connect results in different renormalisation schemes. In asymptotically free theories particulary useful are matchings to those schemes in which perturbative computations at high energies are more easily achieved (first of all MS). It is well known that the bare definition of the coupling in lattice QCD is often not the best o...
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ژورنال
عنوان ژورنال: Physical Review D
سال: 2012
ISSN: 1550-7998,1550-2368
DOI: 10.1103/physrevd.86.054502