On high-order perturbative calculations at finite density
Journal article, Peer reviewed
Published version
Date
2017-02Metadata
Show full item recordCollections
Original version
Ghisoiu, I et al. (2017) On high-order perturbative calculations at finite density. Nuclear Physics B. 915, pp. 102-118. 10.1016/j.nuclphysb.2016.11.023Abstract
We discuss the prospects of performing high-order perturbative calculations in systems characterized by a vanishing temperature but finite density. In particular, we show that the determination of generic Feynman integrals containing fermionic chemical potentials can be reduced to the evaluation of three-dimensional phase space integrals over vacuum on-shell amplitudes — a result reminiscent of a previously proposed “naive real-time formalism” for vacuum diagrams. Applications of these rules are discussed in the context of the thermodynamics of cold and dense QCD, where it is argued that they facilitate an extension of the Equation of State of cold quark matter to higher perturbative orders.