44 citations · 141 across the 10 of their papers we have counts for
10 papers
Geometric Dynamics of Consumer Credit Cycles: A Multivector-based Linear-Attention Framework for Explanatory Economic Analysis
Agus Sudjianto, Sandi Setiawan
This study introduces geometric algebra to decompose credit system relationships into their projective (correlation-like) and rotational (feedback-spiral) components. We represent…
Positive-, negative-, and orthogonal-phase-velocity propagation of electromagnetic plane waves in a simply moving medium
Tom G. Mackay, Akhlesh Lakhtakia, Sandi Setiawan
Planewave propagation in a simply moving, dielectric-magnetic medium that is isotropic in the co-moving reference frame, is classified into three different categories: positive-, n…
A short note on climbing gravity improbable: Superradiant ring fellowship of launching the high Lorentz-factor outflows/jets
Sandi Setiawan
The spin energy extraction from a rotating black hole by amplification of scalar waves inside superradiance resonance wedge cavity (ring), followed by jet formation via magnetic re…
A comparison of superradiance and negative-phase-velocity phenomenons in the ergosphere of a rotating black hole
Sandi Setiawan, Tom G. Mackay, Akhlesh Lakhtakia
The propagation of electromagnetic plane waves with negative phase velocity (NPV) in the ergosphere of a rotating black hole has recently been reported. A comparison of NPV propaga…
Electromagnetic waves with negative phase velocity in Schwarzschild-de Sitter spacetime
Tom G. Mackay, Akhlesh Lakhtakia, Sandi Setiawan
The propagation of electromagnetic plane waves with negative phase velocity (NPV) is considered in Schwarzschild-(anti-)de Sitter spacetime. It is demonstrated that NPV propagation…
Mapping of electromagnetic negative-phase-velocity propagation in the ergosphere of a rotating black hole
Tom G. Mackay, Akhlesh Lakhtakia, Sandi Setiawan
We report on the occurrence of negative-phase-velocity (NPV) planewave propagation in the ergosphere of a rotating black hole. By implementing the Kerr metric, it is demonstrated t…