BCFT moduli space in level truncation

0471780 - FZÚ 2017 RIV US eng J - Journal Article
Kudrna, Matěj - Maccaferri, C.
BCFT moduli space in level truncation.
Journal of High Energy Physics. Roč. 2016, č. 4 (2016), 1-33, č. článku 057. ISSN 1029-8479. E-ISSN 1029-8479
R&D Projects: GA ČR(CZ) GA14-31689S
Institutional support: RVO:68378271
Keywords : deformation: marginal * field theory: string * tachyon: potential * string: open * moduli space * effective potential * nonperturbative * toy model
Subject RIV: BF - Elementary Particles and High Energy Physics
Impact factor: 6.063, year: 2016

We propose a new non-perturbative method to search for marginal deformations in level truncated open string field theory. Instead of studying the flatness of the effective potential for the marginal field (which is not expected to give a one-to-one parametrization of the BCFT moduli space), we identify a new non-universal branch of the tachyon potential which, from known analytic examples, is expected to parametrize the marginal flow in a much larger region of the BCFT moduli space. By a level 18 computation in Siegel gauge we find an increasingly flat effective potential in the non-universal sector, connected to the perturbative vacuum and we confirm that the coefficient of the marginal field (ASFT) has a maximum compatible with the value where the solutions stop existing in the standard Sen-Zwiebach approach.
Permanent Link: http://hdl.handle.net/11104/0269105