Zobrazeno 1 - 10
of 41
pro vyhledávání: '"Zahed, Ahmadullah"'
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 motivation behind examining the local version of the CSDR, we derive a new, c
Externí odkaz:
http://arxiv.org/abs/2311.03451
Publikováno v:
Phys. Rev. A 109, 022223 (2024)
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 quantum circuit obtained from canonically purifying the mixed state. We demo
Externí odkaz:
http://arxiv.org/abs/2307.13450
Autor:
Bhat, Faizan, Zahed, Ahmadullah
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 their ratios, as is typically found in the literature. Inspired by the
Externí odkaz:
http://arxiv.org/abs/2304.02003
Autor:
Zahed, Ahmadullah, Sen, Kallol
We analyze the effect of a simple coin operator, built out of Bell pairs, in a $2d$ Discrete Quantum Random Walk (DQRW) problem. The specific form of the coin enables us to find analytical and closed form solutions to the recursion relations of the D
Externí odkaz:
http://arxiv.org/abs/2302.04140
Autor:
Sinha, Aninda, Zahed, Ahmadullah
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 states and calculate the relevant Bell inequalities for these processes
Externí odkaz:
http://arxiv.org/abs/2212.10213
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 crossing symmetric expansion of scattering amplitudes, dubbed as Feynman
Externí odkaz:
http://arxiv.org/abs/2205.13762
Autor:
Zahed, Ahmadullah
This paper presents the fascinating correspondence between the geometric function theory and the scattering amplitudes with $O(N)$ global symmetry. A crucial ingredient to show such correspondence is a fully crossing symmetric dispersion relation in
Externí odkaz:
http://arxiv.org/abs/2108.10355
Publikováno v:
SciPost Phys. 11, 002 (2021)
An intriguing correspondence between ingredients in geometric function theory related to the famous Bieberbach conjecture (de Branges' theorem) and the non-perturbative crossing symmetric representation of 2-2 scattering amplitudes of identical scala
Externí odkaz:
http://arxiv.org/abs/2103.12108
Publikováno v:
Phys. Rev. Lett. 126, 211602 (2021)
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 the non-perturbative Polyakov bootstrap for CFTs in Mellin space on a f
Externí odkaz:
http://arxiv.org/abs/2101.09017
Autor:
Sinha, Aninda, Zahed, Ahmadullah
Publikováno v:
Phys. Rev. Lett. 126, 181601 (2021)
For 2-2 scattering in quantum field theories, the usual fixed $t$ dispersion relation exhibits only two-channel symmetry. This paper considers a crossing symmetric dispersion relation, reviving certain old ideas in the 1970s. Rather than the fixed $t
Externí odkaz:
http://arxiv.org/abs/2012.04877