Ludwik Silberstein


Ludwik Silberstein was a Polish-American physicist who helped make special relativity and general relativity staples of university coursework. His textbook The Theory of Relativity was published by Macmillan in 1914 with a second edition, expanded to include general relativity, in 1924.

Life

Silberstein was born May 17, 1872 in Warsaw to Samuel Silberstein and Emily Steinkalk. He was educated in Cracow, Heidelberg, and Berlin. To teach he went to Bologna, Italy from 1899 to 1904. Then he took a position at Sapienza University of Rome.
In 1907 Silberstein described a bivector approach to the fundamental electromagnetic equations. When and represent electric and magnetic vector fields with values in, then Silberstein suggested would have values in, consolidating the field description with complexification. This contribution has been described as a crucial step in modernizing Maxwell's equations, while is known as the Riemann–Silberstein vector.
Silberstein taught in Rome until 1920, when he entered private research for the Eastman Kodak Company of Rochester, New York. For nine years he maintained this consultancy with Kodak labs while he gave his relativity course on occasion at the University of Chicago, the University of Toronto, and Cornell University. He lived until January 17, 1948.

Textbook inaugurating relativity science

At the International Congress of Mathematicians in 1912 at Cambridge, Silberstein spoke on "Some applications of quaternions". Though the text was not published in the proceedings of the Congress, it did appear in the Philosophical Magazine of May, 1912, with the title "Quaternionic form of relativity". The following year Macmillan published The Theory of Relativity, which is now available on-line in the Internet Archive. The quaternions used are actually biquaternions. The book is highly readable and well-referenced with contemporary sources in the footnotes.
Several reviews were published. Nature expressed some misgivings:
In his review Morris R. Cohen wrote, "Dr. Silberstein is not inclined to emphasize the revolutionary character of the new ideas, but rather concerned to show their intimate connection with older ones." Another review by Maurice Solovine states that Silberstein subjected the relativity principle to an exhaustive examination in the context of, and with respect to, the principal problems of mathematical physics taken up at the time.
On the basis of the book, Silberstein was invited to lecture at the University of Toronto. The influence of these lectures on John Lighton Synge has been noted:
Silberstein gave a plenary address at the International Congress of Mathematicians in 1924 in Toronto: A finite world-radius and some of its cosmological implications.

The Einstein–Silberstein debate

In 1935, following a controversial debate with Albert Einstein, Silberstein published a solution of Einstein's field equations that appeared to describe a static, axisymmetric metric with only two point singularities representing two point masses. Such a solution clearly violates our understanding of gravity: with nothing to support them and no kinetic energy to hold them apart, the two masses should fall towards each other due to their mutual gravity, in contrast with the static nature of Silberstein's solution. This led Silberstein to claim that A. Einstein's theory was flawed, in need of a revision. In response, Einstein and Rosen published a Letter to the Editor in which they pointed out a critical flaw in Silberstein's reasoning. Unconvinced, Silberstein took the debate to the popular press, with The Evening Telegram in Toronto publishing an article titled "Fatal blow to relativity issued here" on March 7, 1936. Nonetheless, Einstein was correct and Silberstein was wrong: as we know today, all solutions to Weyl's family of axisymmetric metrics, of which Silberstein's is one example, necessarily contain singular structures that are responsible for holding masses against the attractive force of gravity in a static configuration.

Other contributions

According to Martin Claussen, Ludwik Silberstein initiated a line of thought involving eddy currents in the atmosphere, or fluids generally. He says that Silberstein anticipated foundational work by Vilhelm Bjerknes.

Works