12 papers
Heterotic string couplings at order in NS-NS sector
Alireza Pahlavan, Mehdi Ameri, Mohammad R. Garousi
We utilize the standard T-duality procedure to derive the classical effective action of heterotic string theory at the eight-derivative order within the NS-NS sector, which compris…
Tachyon couplings from S-matrix elements in bosonic string theory
Mohammad R. Garousi
We introduce a systematic framework for constructing spacetime and D-brane effective actions in bosonic string theory, encompassing both tachyon and massless modes. The actions are…
The emergence of inherently 9-dimensional one-loop effective action from T-duality
Mohammad R. Garousi
Recent studies suggest that applying the Buscher rules to the dimensional reduction of ten-dimensional, one-loop effective actions generate "purely stringy" couplings in nine dimen…
S-duality in higher-derivative corrections of heterotic supergravity
Mohammad R. Garousi
This study examines the consistency of heterotic supergravity under T-duality when the -field gauge transformation is rendered anomalous by the Green-Schwarz mechanism. We demon…
T-duality and background-dependence in genus corrections to effective actions
Mohammad R. Garousi
The classical effective action in string theory is background-independent, and its invariance under the Buscher rules constrains its form up to a few parameters. This work investig…
Effective action of bosonic string theory at order
Mehdi Ameri, Alireza Pahlavan, Mohammad R. Garousi
In this work, we derive the classical effective action of bosonic string theory at order for the metric, Kalb-Ramond field, and dilaton by imposing a higher-derivative ex…