https://doi.org/10.1140/epjc/s10052-018-5868-z
Regular Article - Theoretical Physics
On non-BPS effective actions of string theory
1
Institute for Theoretical Physics, TU Wien, Wiedner Hauptstrasse 8-10/136, 1040, Vienna, Austria
2
Faculty of Physics, University of Warsaw, ul. Pasteura 5, 02-093, Warsaw, Poland
3
Faculty of Mathematics, Mathematical Institute, Charles University, 18675, Prague, Czech Republic
* e-mail: ehsan.hatefi@fuw.edu.pl
** e-mail: ehsanhatefi@gmail.com
Received:
25
September
2017
Accepted:
7
May
2018
Published online:
17
May
2018
We discuss some physical prospective of the non-BPS effective actions of type IIA and IIB superstring theories. By dealing with all complete three and four point functions, including a closed Ramond–Ramond string (in terms of both its field strength and its potential), gauge (scalar) fields as well as a real tachyon and under symmetry structures, we find various restricted world volume and bulk Bianchi identities. The complete forms of the non-BPS scattering amplitudes including their Chan–Paton factors are elaborated. All the singularity structures of the non-BPS amplitudes, their all order 
higher-derivative corrections, their contact terms and various modified Bianchi identities are derived. Finally, we show that scattering amplitudes computed in different super-ghost pictures are compatible when suitable Bianchi identities are imposed on the Ramond–Ramond fields. Moreover, we argue that the higher-derivative expansion in powers of the momenta of the tachyon is universal.
© The Author(s), 2018
