Starting from the pseudo- B0B0 gauge solution for marginal deformations in OSFT, we analytically compute the relation between the perturbative deformation parameter λ~λ~ in the solution and the BCFT marginal parameter λλ , up to fifth order, by evaluating the Ellwood invariants. We observe that the microscopic reason why λ~λ~ and λλ are different is that the OSFT propagator renormalizes contact-term divergences differently from the contour deformation used in BCFT
BCFT and OSFT moduli: an exact perturbative comparison
Larocca, Pier Vittorio;Maccaferri, Carlo
2017-01-01
Abstract
Starting from the pseudo- B0B0 gauge solution for marginal deformations in OSFT, we analytically compute the relation between the perturbative deformation parameter λ~λ~ in the solution and the BCFT marginal parameter λλ , up to fifth order, by evaluating the Ellwood invariants. We observe that the microscopic reason why λ~λ~ and λλ are different is that the OSFT propagator renormalizes contact-term divergences differently from the contour deformation used in BCFT
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