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S-matrix and homological perturbation lemma
Pulmann, Ján ; Jurčo, Branislav (advisor) ; Doubek, Martin (referee)
Loop homotopy Lie algebras, which appear in closed string field theory, are a generalization of homotopy Lie algebras. For a loop homotopy Lie algebra, we transfer its structure on its homology and prove that the transferred structure is again a loop homotopy algebra. Moreover, we show that the homological perturbation lemma can be regarded as a path integral, integrating out the degrees of freedom which are not in the homology. The transferred action then can be interpreted as an effective action in the Batalin-Vilkovisky formalism. A review of necessary results from Batalin- Vilkovisky formalism and homotopy algebras is included as well. Powered by TCPDF (www.tcpdf.org)
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Finite dimensional BV formalism
Skácel, Ondřej ; Jurčo, Branislav (advisor) ; Pulmann, Ján (referee)
We study the BV formalism in both the infinite- and finite-dimensional case. We outline the use in QFT and provide explicit calculations for the Yang- Mills theories. We summarize the flat finite-dimensional case and show an equiv- alence bewteen two definitions of the effective observable. An overview of graded geometry is included. 1
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S-matrix and homological perturbation lemma
Pulmann, Ján ; Jurčo, Branislav (advisor) ; Doubek, Martin (referee)
Loop homotopy Lie algebras, which appear in closed string field theory, are a generalization of homotopy Lie algebras. For a loop homotopy Lie algebra, we transfer its structure on its homology and prove that the transferred structure is again a loop homotopy algebra. Moreover, we show that the homological perturbation lemma can be regarded as a path integral, integrating out the degrees of freedom which are not in the homology. The transferred action then can be interpreted as an effective action in the Batalin-Vilkovisky formalism. A review of necessary results from Batalin- Vilkovisky formalism and homotopy algebras is included as well. Powered by TCPDF (www.tcpdf.org)
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Operads and field theory
Pulmann, Ján ; Jurčo, Branislav (advisor) ; Křižka, Libor (referee)
Operads and their variants, modular and cyclic operads, naturally describe compositions of objects of various types. We provide an accessible introduction to the theory of operads, the formalism for modular operads from [1] and modern application of modular operads to physics, due to Barannikov [2]. Through examples, we introduce Batalin-Vilkovisky formalism as a tool for cohomological integration of path integral in quantum field theories. A master equation, consistency condition for action, follows from this formalism. Solutions to master equation also describe algebras over Feynman transform of a modular operad. We explore the master equation defined in terms of modular operad and review an application to closed string field theory. [1] Martin Doubek, Branislav Jurco, and Korbinian Muenster. Modular operads and the quantum open-closed homotopy algebra. 2013. arXiv: 1308.3223 [math-AT]. [2] Serguei Barannikov. "Modular operads and Batalin-Vilkovisky geometry". In: International Mathematics Research Notices 2007 (2007), rnm075.
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