59 citations · 102 across the 13 of their papers we have counts for
13 papers
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…
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 me…
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…
A Comment on Deriving the Gibbons-Hawking-York Term From the String Worldsheet
Amr Ahmadain, Vasudev Shyam, Zihan Yan
In this note, we show that the noncovariant metric boundary term obtained from the nonlinear sigma model worldsheet derivation of the bulk off-shell sphere partition function is cl…
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 conditi…
Off-Shell Strings II: Black Hole Entropy
Amr Ahmadain, Aron C. Wall
In 1994, Susskind and Uglum argued that it is possible to derive the Bekenstein-Hawking entropy from string theory. In this article we explain the conceptual underpinnings…
Off-Shell Strings I: S-matrix and Action
Amr Ahmadain, Aron C. Wall
We explain why Tseytlin's off-shell formulation of string theory is well-defined. Although quantizing strings on an off-shell background requires an arbitrary choice of Weyl frame,…
Boundary Description of Microstates of the Two-Dimensional Black Hole
Amr Ahmadain, Alexander Frenkel, Krishnendu Ray +1
We identify the microstates of the non supersymmetric, asymptotically flat 2d black hole in the dual c=1 matrix quantum mechanics (MQM). We calculate the partition function of the…
Emergent geometry and path integral optimization for a Lifshitz action
Amr Ahmadain, Israel Klich
Extending the background metric optimization procedure for Euclidean path integrals of two-dimensional conformal field theories, introduced by Caputa et al. (Phys. Rev. Lett. 119,…
A (1+1)-dimensional Lifshitz Weyl Anomaly From a Schrdinger-invariant Non-relativistic Chern-Simons Action
Amr Ahmadain
The main result of this paper is that the Weyl anomaly of a (1+1)-dimensional Lifshitz effective action can be derived from a (2+1)-dimensional non-relativistic Schr$\mathrm{…
Holographic rainbow networks for colorful Motzkin and Fredkin spin chains
Rafael N. Alexander, Amr Ahmadain, Zhao Zhang +1
We present bulk tensor networks that exactly represent the ground states of a continuous family of one-dimensional frustration-free Hamiltonians. These states, which are known as a…
Quantum phase transition from bounded to extensive entanglement entropy in a frustration-free spin chain
Zhao Zhang, Amr Ahmadain, Israel Klich
We introduce a continuous family of frustration-free Hamiltonians with exactly solvable ground states. We prove that the {ground state of our model is non-degenerate and exhibits}…