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We study 1/2 BPS domain walls, 1/2 BPS flux tubes (strings) and their 1/4 BPSjunctions. We consider the simplest example of N=2 Abelian gauge theory withtwo charged matter hypermultiplets which contains all of the above-listedextended objects. In particular, we focus on string-wall junctions (boojums)and calculate their energy. It turns out to be logarithmically divergent in theinfrared domain. We compute this energy first in the (2+1)-dimensionaleffective theory on the domain wall and then, as a check, obtain the sameresult from the point of view of (3+1)-dimensional bulk theory. Next, we studyinteractions of boojums considering all possible geometries of string-walljunctions and directions of the string magnetic fluxes.Comment: 23 pages, 11 figures, v2 references adde

physical review. d. particles, fields, gravitation, and cosmology/physical review. d, particles, fields, gravitation, and cosmology

Studying boojums in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="script">N</mml:mi><mml:mo>=</mml:mo><mml:mn>2</mml:mn></mml:math>theory with walls and vortices

Studying boojums inN=2theory with walls and vortices