4 papers
Field Theories from Bundles of Strings
Sazzad Nasir, Antti J. Niemi
We propose that at low energy four dimensional bosonic strings may form bound states where they become bundled together much like the filaments in a cable. We inspect the propertie…
(Meta)stable closed vortices in 3+1 dimensional gauge theories with an extended Higgs sector
Antti J. Niemi, Kaupo Palo, Sami Virtanen
In gauge theories with an extended Higgs sector the classical equations of motion can have solutions that describe stable, closed finite energy vortices. Such vortices separate two…
Aspects of mass gap, confinement and N=2 structure in 4-D Yang-Mills theory
Jussi Kalkkinen, Antti J. Niemi
We introduce new variables in four dimensional SU(N) Yang-Mills theory. These variables emerge when we sum the path integral over classical solutions and represent the summation as…
Quantum Mechanical Anomalies and the De Witt Effective Action
Topi Kärki, Antti J. Niemi
We study the partition function of N=1 supersymmetric De Rham quantum mechanics on a Riemannian manifold, with a nontrivial chemical potential for the fermions. General argumen…