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A. Y. Shiekh

Publications and source records attributed to A. Y. Shiekh.

17 recordsLinked to original sources
arXiv2012

Approaching the event horizon of a black hole

It is argued that it takes an infinite amount of external time for a freely falling test particle to reach the event horizon of a classical black hole (which happens in finite faller time), and that in this time the black hole would have evaporated due to Hawking radiation; so the freely falling test particle would itself evaporate at the event horizon, and so not pass through.

physics.gen-ph↗
arXiv2011

Operator Regularization of Feynman diagrams at multi-loop order

It may be possible to use operator regularization with Feynman diagrams, which would greatly simplify its use as it has so far been limited to the more complicated Schwinger approach. Operator regularization, unlike $ζ$-function regularization, is not limited to one-loop order, and preserves supersymmetry unlike dimensional regularization. In practice the use of operator regularization in the context of Feynman diagrams is found not to complicate the calculation.

hep-th↗
arXiv1996

Can the Equivalence Principle Survive Quantization?

It is well known that Einstein gravity is non-renormalizable; however a generalized approach is proposed that leads to Einstein gravity {\it after} renormalization. This them implies that at least one candidate for quantum gravity treats all matter on an equal footing with regard to the gravitational behaviour.

gr-qc↗
arXiv1993

Orthodox Gravity

A scalar field theory is investigated within the context of orthodox quantum gravity.

hep-th↗
arXiv1992

Centri`fugal' Force around a Black Hole

Besides having some very interesting perturbatively unstable orbits, it seems that for a Schwarzschild black hole, below $r=3M$, the force always increases inward with increasing angular momentum. Here this previously known result is derived with greater simplicity, and a similar analysis is performed for black holes with angular momentum and charge.

astro-ph↗