44 citations · 141 across the 10 of their papers we have counts for
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Applications of geometric algebra to black holes and Hawking radiation
S. Setiawan
We discuss the applications of Gauge Theory of Gravity (GTG) within the language of geometric algebra to black holes and Hawking radiation. Applications include the Unruh effect, t…
Negative phase velocity of electromagnetic waves and the cosmological constant
Tom G. Mackay, Sandi Setiawan, Akhlesh Lakhtakia
Examining the propagation of electromagnetic plane waves with the wavevector directed in opposition to the time-averaged Poynting vector in cosmological spacetime with piecewise un…
Gravitation and Electromagnetic Wave Propagation with Negative Phase Velocity
Tom G. Mackay, Akhlesh Lakhtakia, Sandi Setiawan
Gravitation has interesting consequences for plane wave propagation in a vacuum. The propagation of plane waves with phase velocity directed opposite to the the time-averaged Poynt…
Global and local perspectives of gravitationally assisted negative-phase-velocity propagation of electromagnetic waves in vacuum
Akhlesh Lakhtakia, Tom G. Mackay, Sandi Setiawan
Consistently with the Einstein equivalence principle and using an electromagnetic formulation first suggested by Tamm, we show that a local observer cannot observe negative-phase-v…