Thesis Collection
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Browsing by Author "Micheli, J."
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Instantons and the A (2) condensate
Boucaud, Ph.; Leroy, J. P.; Le Yaouanc, Alain; Micheli, J.; Pène, O.; Soto Borrero, Feliciano Carlos de; Donini, A.; Moutarde, Hervé; Rodríguez Quintero, José
(American Physical Society, 2002)
We argue that the ⟨A2OPE⟩ condensate found in the Landau gauge on lattices, when an operator product expansion of Green’s functions is performed, might be explained by instantons. We use cooling to estimate the instanton ... -
IR finiteness of the ghost dressing function from numerical resolution of the ghost SD equation
Boucaud, Ph.; Leroy, J. P.; Le Yaouanc, Alain; Micheli, J.; Pène, O.; Rodríguez Quintero, José (Springer Verlag, 2008-06)
We solve numerically the Schwinger-Dyson ghost equation in the Landau gauge for a given, finite at k = 0 gluon propagator (i.e. the infrared exponent of its dressing function, αgluon, is 1) and under the usual assumption ... -
On the IR behaviour of the Landau-gauge ghost propagator
Boucaud, Ph.; Leroy, J. P.; Le Yaouanc, Alain; Micheli, J.; Pène, O.; Rodríguez Quintero, José (Springer Verlag, 2008-06)
We examine analytically the ghost propagator Dyson-Schwinger Equation (DSE) in the deep IR regime and prove that a finite ghost dressing function at vanish- ing momentum is an alternative solution (solution II) to the ... -
The strong coupling constant at small momentum as an instanton detector
Boucaud, Ph.; Le Yaouanc, Alain; Leroy, J. P.; Micheli, J.; Pène, O.; Soto Borrero, Feliciano Carlos de; Moutarde, Hervé; Rodríguez Quintero, José (Springer Verlag, 2003)
We present a study of αMOM(p) at small p computed from the lattice in the quenched approximation (nf = 0). It shows a dramatic proptop4 law which can be understood within an instanton liquid model. In this framework the ... -
Transparent expression of the A2 condensate’s renormalization
Boucaud, Ph.; Soto Borrero, Feliciano Carlos de; Le Yaouanc, Alain; Leroy, J. P.; Micheli, J.; Moutarde, Hervé; Pène, O.; Rodríguez Quintero, José (American Physical Society, 2003)
We give a more transparent understanding of the vacuum expectation value of the renormalized local operator A2 by relating it to the gluon propagator integrated over the momentum. The quadratically divergent perturbative ...
