4 papers
Effective de Sitter-Schwarzschild Metrics
Moorad Alexanian
An earlier work that replaced the de Sitter-Schwarzschild metric for a cosmological constant Lambda <=0 by an effective anti-de Sitter black hole analytic at Lambda = 0 is here ext…
Parametrized Version of the Generalized Aubry-André Model
Moorad Alexanian
A recently introduced recurrence-relation ansatz applied to the Bose-Hubbard model is here used in the generalized Aubry-Andre model. The resulting modified Aubry-Andre model allow…
Symmetric and Asymmetric Quantum Rabi Model
Moorad Alexanian
We introduce a modified Jaynes-Cummings model with single-photon cavity radiation field but with the atomic system instead of exchanging a single photon as in the Jaynes-Cummings m…
Ansatz for the Two-Dimensional Ising Model in an External Magnetic Field
Moorad Alexanian
An ansatz applied to the two-dimensional Ising model in an external magnetic field h gives rise to an exactly soluble model. The singularity in the magnetization found by Onsager d…