2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/50701Quadratic tachyon profile has been discussed in the boundary string field theory. We here compute the g-function by factorizing the cylinder amplitude. The answer is compared with the disc partition function. The boundary state is constructed. We extend these computations to those of the boundary sine-Gordon model at the free fermion point.9 pages, references addedHigh Energy Physics - Theorytext