On the coalgebra description of OCHA

Details On the coalgebra description of OCHA On the coalgebra description of OCHA

2006-07-18

arxiv.org/abs/math/0607435v2

Mathematics

Quantum Algebra

14 pages, 2 figures; v2: throughoutly reviewed and extended

Scientific paper

OCHA is the homotopy algebra of open-closed strings. It can be defined as a sequence of multilinear operations on a pair of DG spaces satisfying certain relations which include the $L_\infty$ relations in one space and the $A_\infty$ relations in the other. In this paper we show that the OCHA structure is intrinsic to the tensor product of the symmetric and tensor coalgebras. We also show how an OCHA can be obtained from $A_\infty$-extesions and define the {\it universal enveloping} $A_\infty$-algebra of an OCHA as an $A_\infty$-extension of the universal enveloping of its $L_\infty$ part by its $A_\infty$ part.

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