Year: 2011

Dark Matter and Charged Exotic Dust

The density profiles of dark matter halos are often modeled by an approximate solution to the isothermal Lane-Emden equation with suitable boundary conditions at the origin. It is shown here that such a model corresponds to an exact solution of the Einstein-Maxwell equations for exotic charged dust. It is also shown that, because of its necessarily very small charge to mass ratio, the fact that the particles are charged does not necessarily rule out such material as a candidate for dark matter.

Dark Matter-Charged Exotic Dust

Version published in Journal of Physics and Astronomy, Volume 2, Issue 3 (2013):

J Phys & Astron-Chrged Exotic Dust

BORN SECRET: The H-Bomb, the Progressive Case and National Security

By A. DeVolpi, G.E. Marsh, T.A. Postol, and G.S. Stanford.

Born Secret looks at the widely publicized Progressive magazine case and the U.S. government’s then unprecedented attempt to prevent publication of an H-bomb design culled by a journalist from unclassified materials. The book, originally published by Pergamon Press in 1981, has long been out of print and the authors have decided to make it available to the general public and those having an interest in the Atomic Energy Act and the First Amendment. After the court proceedings ended, the authors also donated a copy of the complete unclassified in camera file to the University of Chicago Libraries.

The file is a PDF of approximately 300MB. To download, click here.


The following 6.5 MB file has been reformatted and corrected. Born Secret-Reformated with corrections-updates

Electromagnetic and Gravitational Waves: the Third Dimension

Plane electromagnetic and gravitational waves interact with particles in such a way as to cause them to oscillate not only in the transverse direction but also along the direction of propagation. The electromagnetic case is usually shown by use of the Hamilton-Jacobi equation and the gravitational by a transformation to a local inertial frame. Here, the covariant Lorentz force equation and the second order equation of geodesic deviation followed by the introduction of a local inertial frame are respectively used. It is often said that there is an analogy between the motion of charged particles in the field of an electromagnetic wave and the motion of test particles in the field of a gravitational wave. This analogy is examined and found to be rather limited. It is also shown that a simple special relativistic relation leads to an integral of the motion, characteristic of plane waves, that is satisfied in both cases.

Canadian Journal of Physics 89, 1187-1194 (2011).

Electromagnetic and Gravitational Waves: The Third Dimension

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