arXiv subjects

William G Unruh

Publications and source records attributed to William G Unruh.

4 recordsLinked to original sources

arXiv2026

Black Hole--Entropy Container or Creator

Do black holes possess entropy or do they create it? The dominant assumption is that they possess entropy, and a they evaporate that entropy is emitted and decreases. In this paper I use a model of a linear amplifier, in which I argue that the amplifier has not entropy and yet it emits entropy in the process of it operation. This model is closely related to behaviour of black holes, resulting in answer the question of that title that black holes do not have entropy, but nevertheless them create and emit entropy with the total entropy emitted being the same as the usual expression proportional to the square of the mass of the black hole.

gr-qc↗

arXiv2019

The ambiguity function and the displacement operator basis in quantum mechanics

We present a method for calculating expectation values of operators in terms of a corresponding c-function formalism which is not the Wigner--Weyl position-momentum phase-space, but another space. Here, the quantity representing the quantum system is the expectation value of the displacement operator, parametrized by the position and momentum displacements, and expectation values are evaluated as classical integrals over these parameters. The displacement operator is found to offer a complete orthogonal basis for operators, and some of its other properties are investigated. Connection to the Wigner distribution and Weyl procedure are discussed and examples are given.

quant-ph↗

arXiv2018

Kepler's laws without calculus

Kepler's laws are derived from the inverse square law without the use of calculus and are simplified over previous such derivations.

physics.hist-ph↗

arXiv2018

Prehawking radiation

Using the 2-D quantum energy momentum tensor expectation value near a black hole, the value near a collapsing shell which stops collapsing just outside the putative horizon is calculated and shown not to have any evidence of preHawking radiation.

gr-qc↗