313 citations · 2k across the 83 of their papers we have counts for
14 papers · 1 filter
Splitting The Gluon?
Antti J. Niemi, Niels R. Walet
In the strongly correlated environment of high-temperature cuprate superconductors, the spin and charge degrees of freedom of an electron seem to separate from each other. A simila…
Baryon structure in a quark-confining non-local NJL model
Amir H. Rezaeian, Niels R. Walet, Michael C. Birse
We study the nucleon and diquarks in a non-local Nambu-Jona-Lasinio model. For certain parameters the model exhibits quark confinement, in the form of a propagator without real pol…
Exact renormalization group and many-fermion systems
B. Krippa, M. C. Birse, J. A. McGovern +1
The exact renormalization group methods is applied to many fermion systems with short-range attractive force. The strength of the attractive fermion-fermion interaction is determin…
Pairing in Many-Fermion Systems: An Exact Renormalisation Group Treatment
Michael C. Birse, Boris Krippa, Judith A. McGovern +1
We study the application of the exact renormalisation group to a many-fermion system with a short-range attractive force. We introduce a boson field to describe pairing effects, an…
Relativistic Faddeev approach to a non-local NJL model
Amir H. Rezaeian, Niels R. Walet, Michael C. Birse
The diquark and nucleon are studied in a non-local NJL model. We solve the relativistic Faddeev equation and compare the results with the ordinary NJL model. Although the model is…
Renormalization of Hamiltonian Field Theory; a non-perturbative and non-unitarity approach
Amir H. Rezaeian, Niels R. Walet
Renormalization of Hamiltonian field theory is usually a rather painful algebraic or numerical exercise. By combining a method based on the coupled cluster method, analysed in deta…
Soliton Systems at Finite Temperatures and Finite Densities
Oliver Schwindt, Niels R. Walet
The finite-density and finite-temperature phase portraits of the baby-Skyrme and Skyrme models are investigated. Both grand-canonical and canonical approaches are employed. The gra…
Colour superconductivity in finite systems
Paolo Amore, Michael C. Birse, Judith A. McGovern +1
In this paper we study the effect of finite size on the two-flavour colour superconducting state. As well as restricting the quarks to a box, we project onto states of good baryon…
Towards a phase diagram of the 2D Skyrme model
Oliver Schwindt, Niels R. Walet
We discuss calculations of the phase diagram of the baby-Skyrme model, a two-dimensional version of the model that has been so successful in the description of baryons. Contact is…
Quantum Phase Transitions and the Extended Coupled Cluster Method
N. E. Ligterink, N. R. Walet, R. F. Bishop
We discuss the application of an extended version of the coupled cluster method to systems exhibiting a quantum phase transition. We use the lattice O(4) non-linear sigma model in…
Nucleons or diquarks? Competition between clustering and color superconductivity in quark matter
Stephane Pepin, Michael C. Birse, Judith A. McGovern +1
We study the instabilities of quark matter in the framework of a generalized Nambu--Jona-Lasinio model, in order to explore possible competition between three-quark clustering to f…
Quantising the B=2 and B=3 Skyrmion systems
Niels R. Walet
We examine the quantisation of a collective Hamiltonian for the two-baryon system derived by us in a previous paper. We show that by increasing the sophistication of the approximat…
The large- limit and the behavior of and
Atsushi Hosaka, Niels R. Walet
We investigate the isoscalar and isovector components of the axial vector coupling constants, and , using algebraic models that lead to the correct symmetries of l…
The kinetic energy and and the geometric structure in the sector of the Skyrme model: A study using the Atiyah-Manton Ansatz
Niels R. Walet
We study the construction of the collective-coordinate manifold in the baryon number two sector of the Skyrme model. To that end we use techniques of adiabatic large amplitude coll…