5 papers
The GHY boundary term from the string worldsheet to linear order
Amr Ahmadain, Shoaib Akhtar, Rifath Khan
Using the method of images we derive the boundary term of the Einstein- action in half-space from the spherical worldsheet to first order in and to linear order in the…
A Worldsheet Derivation of the Classical Off-shell Boundary Action for the Dilaton in Half-Space
Amr Ahmadain, Rifath Khan
We use the method of images to present a worldsheet derivation of the sphere partition function for the dilaton in half-space to leading order in with Neumann boundary condit…
Closed String Field Theory in 25.99 Dimensions
Amr Ahmadain, Alexander Frenkel, Xi Yin
We return to and refine Zwiebach's formulation of closed string field theory (CSFT) built around non-critical backgrounds [1,2], restricting our attention to genus zero. The struct…
Strings at the Tip of the Cone and Black Hole Entropy From the Worldsheet: Part I
Amr Ahmadain, Ming Yang
We study the nonlinear sigma model (NLSM) worldsheet action describing the motion of closed bosonic strings in the target space of a two-dimensional (2D) flat cone in polar coordin…
A Background-Independent Closed String Action at Tree Level
Amr Ahmadain, Alexander Frenkel, Aron C. Wall
We propose an off-shell bosonic string action that removes the renormalization window constraint of [1]. To all orders in conformal perturbation theory, this action allows for defo…