136 citations · 388 across the 13 of their papers we have counts for
15 papers
Analyticity and positivity of Green's functions without Lorentz
Paolo Creminelli, Alessandro Longo, Borna Salehian +1
We study the properties imposed by microcausality and positivity on the retarded two-point Green's function in a theory with spontaneous breaking of Lorentz invariance. We assume i…
A Geometric View on Crossing-Symmetric Dispersion Relations
Joan Elias Miro, Andrea Guerrieri, Mehmet Asim Gumus +1
We introduce a general framework for constructing dispersion relations using crossing-symmetric variables, leading to infinitely many distinct representations of the 2-to-2 scatter…
Bootstrapping leading hadronic muon anomaly
Ahmadullah Zahed
We bootstrap the leading order hadronic contribution to using unitarity, analytic properties, crossing symmetry and finite energy sum rules (FESR) from quantum chromodynamics…
Bootstrapping High-Energy Observables
Faizan Bhat, Debapriyo Chowdhury, Aninda Sinha +2
In this paper, we set up the numerical S-matrix bootstrap by using the crossing symmetric dispersion relation (CSDR) to write down Roy equations for the partial waves. As a motivat…
Complexity for one-dimensional discrete time quantum walk circuits
Aranya Bhattacharya, Himanshu Sahu, Ahmadullah Zahed +1
We compute the complexity for the mixed state density operator derived from a one-dimensional discrete-time quantum walk (DTQW). The complexity is computed using a two-qubit quantu…
A Celestial Route to AdS Bulk Locality
Faizan Bhat, Ahmadullah Zahed
We prove a precise form of AdS bulk locality by deriving analytical two-sided bounds on bulk Wilson coefficients. Our bounds are on the Wilson coefficients themselves, rather than…
A simple coin for a entangled walk
Ahmadullah Zahed, Kallol Sen
We analyze the effect of a simple coin operator, built out of Bell pairs, in a Discrete Quantum Random Walk (DQRW) problem. The specific form of the coin enables us to find an…
Bell inequalities in 2-2 scattering
Aninda Sinha, Ahmadullah Zahed
We consider Bell inequalities in 2-2 scattering of photons, gravitons, fermions and pions. We choose measurement settings that give maximum Bell violation for maximally entangled s…
Locality and Analyticity of the Crossing Symmetric Dispersion Relation
Debapriyo Chowdhury, Parthiv Haldar, Ahmadullah Zahed
This paper discusses the locality and analyticity of the crossing symmetric dispersion relation (CSDR). Imposing locality constraints on the CSDR gives rise to a local and fully cr…
Positivity and Geometric Function Theory Constraints on Pion Scattering
Ahmadullah Zahed
This paper presents the fascinating correspondence between the geometric function theory and the scattering amplitudes with global symmetry. A crucial ingredient to show suc…
Quantum field theory and the Bieberbach conjecture
Parthiv Haldar, Aninda Sinha, Ahmadullah Zahed
An intriguing correspondence between ingredients in geometric function theory related to the famous Bieberbach conjecture (de Branges' theorem) and the non-perturbative crossing sy…
Crossing Symmetric Dispersion Relations for Mellin Amplitudes
Rajesh Gopakumar, Aninda Sinha, Ahmadullah Zahed
We consider manifestly crossing symmetric dispersion relations for Mellin amplitudes of scalar four point correlators in conformal field theories (CFTs). This allows us to set up t…
Crossing Symmetric Dispersion Relations in QFTs
Aninda Sinha, Ahmadullah Zahed
For 2-2 scattering in quantum field theories, the usual fixed dispersion relation exhibits only two-channel symmetry. This paper considers a crossing symmetric dispersion relat…
Crossing symmetry, transcendentality and the Regge behaviour of 1d CFTs
Pietro Ferrero, Kausik Ghosh, Aninda Sinha +1
We develop the technology for Polyakov-Mellin (PM) bootstrap in one-dimensional conformal field theories (CFT). By adding appropriate contact terms, we bootstrap various effect…
Positive geometry in the diagonal limit of the conformal bootstrap
Kallol Sen, Aninda Sinha, Ahmadullah Zahed
We consider the diagonal limit of the conformal bootstrap in arbitrary dimensions and investigate the question if physical theories are given in terms of cyclic polytopes. Recently…