14-16 November 2011
IPN Orsay
Europe/Paris timezone

Beyond-mean-field theories with zero-range effective interactions: A way to handle the ultraviolet divergence.

14 Nov 2011, 15:45
Auditorium Irène Joliot-Curie (IPN Orsay)

Auditorium Irène Joliot-Curie

IPN Orsay


Dr Marcella Grasso (IPNO)


Zero-range effective interactions are commonly used in nuclear physics and in other domains to describe many-body systems within the mean field model. If they are used in a beyond mean-field framework, contributions to the total energy that display an ultraviolet divergence are found. We propose a general strategy to regularize this divergence and we illustrate it in the case of the second-order corrections to the equation of state (EOS) of uniform symmetric matter. By setting a momentum cut-off Λ, we show that for every (physically meaningful) value of Λ it is possible to determine a new interaction such that the EOS with the second-order corrections reproduces the empirical EOS, with a fit of the same quality as that obtained at the mean-field level.

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