Einstein: His Life and Universe

the

Cambridge Companion to Einstein

, courtesy of the author; Norton 2000; Goenner 2004.

2

. Einstein, “The Principles of Research,” a toast in honor of Max Planck, Apr. 26, 1918, CPAE 7: 7.

3

. Einstein to Hermann Weyl, Apr. 6, 1918.

4

. Einstein to Hermann Weyl, Apr. 8, 1918. In a letter to Heinrich Zangger, May 8, 1918, Einstein called Weyl’s theory “ingenious” but “physically incorrect.” It did, however, later become one of the recognized precursors of Yang-Mills gauge theory.

5

. My description of the work of Kaluza and Klein relies on Krauss, 94–104, which is an engaging book on the role extra dimensions have played in explaining the universe.

6

. Einstein to Theodor Kaluza, Apr. 21, 1919.

7

. Einstein to Niels Bohr, Jan. 10, 1923, AEA 8-74.

8

. Einstein to Hermann Weyl, May 26, 1923, AEA 24-83.

9

. Einstein, “On the General Theory of Relativity,” Prussian Academy, Feb. 15, 1923.

10

.

New York Times

, Mar. 27, 1923.

11

. Pais 1982, 466; Einstein, “On the General Theory of Relativity,” the Prussian Academy, Feb. 15, 1923.

12

. Einstein, “Unified Field Theory of Gravity and Electricity,” July 25, 1925; Hoffmann 1972, 225.

13

. Steven Weinberg, “Einstein’s Mistakes,”

Physics Today

(Nov. 2005).

14

. Einstein, “On the Unified Theory,” Jan. 30, 1929.

15

. Einstein to Michele Besso, Jan. 5, 1929, AEA 7-102.

16

.

New York Times

, Nov. 4, 1928; Vallentin, 160.

17

. Clark, 494;

London Daily Chronicle

, Jan. 26, 1929.

18

. “Einstein’s Field Theory,”

Time

, Feb. 18, 1929. Einstein also appeared on

Time