Abstract
From 1907 to 1925, Albert Einstein dominated the development of the general relativity theory of gravitation. His own work on the theory of gravitation from 1912 to 1916 had the drama of high adventure. David Hilbert, fascinated by Einstein’s work on relativity and Gustav Mie’s work on electrodynamics, decided to construct a unified field theory of matter. In two communications to the Gottingen Academy (on 20 November 1915 and 23 December 1916), Hilbert developed his theory of the foundations of physics. In the first of these communications, he derived the field equations of gravitation and the conditions governing them. Hilbert’s work, although inspired by Einstein, was independent of and simultaneous with Einstein’s derivation of the field equations and, in certain essential respects, went beyond Einstein’s. Einstein, at that time, was very critical of the efforts of Mie, Hilbert and Weyl to construct a unified field theory of gravitation and electromagnetism. After 1925, such a programme became his primary mission.
In this paper, we have given an account of the intellectual struggles of this fascinating period when the modern theory of gravitation was created.
This investigation developed from a question which Professor Eugene Wigner asked me in November 1971 about Hilbert’s contribution to the equations of general relativity, and my reply to him. See Acknowledgements and Appendix.
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References and Notes
From Einstein-Sommerfeld Briefwechsel, edited by A. Hermann, Schwabe and Co., Basel/ Stuttgart 1968, p. 26. Writing to Hilbert on 1 November 1912 Sommerfeld said, ‘My writing to Einstein was in vain…. Einstein is obviously so deeply immersed in [the theory of] gravitation, that he is deaf against everything else.’ (p. 27).
A. Einstein, Jahrbuch der Radioaktivität und Elektronik 4 (1907), pp. 443–444.
A. Einstein, Jahrbuch 4 (1907), Ref. (2), p. 454.
A. Einstein, Jahrbuch 4 (1907), Ref. (2), p. 454.
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A. Einstein, Ref. (12), p. 908.
They actually do so on bilinear expressions in the gradients. (See M. Abraham, Phys. Z. 13, 3.)
M. Abraham, Ref. (16), p. 3.
M. Abraham, Ref. (16), p. 4.
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M. Abraham, Phys. Z. 13, p. 797.
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The postulate (ii), which states the equivalence of masses, is also satisfied if the gravitational potential does not change significantly in the system considered.
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Einstein’s lectures at the Naturforschende Gesellschaft, Zurich, were given on the occasion of the annual meeting of the Schweizerische naturforschende Gesellschaft, at Frauenfeld on 9 September 1913. The lecture at the Congress of Natural Scientists in Vienna was given in November 1913. The final version of the ‘Entwurf’ paper was written after his lectures at both of these conferences.
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With considerable confidence, Einstein wrote in this paper: [Ref. (52)]: The laws governing these differential forms have been obtained by Christoffel, Ricci and Levi-Civita. I would like to present here an especially simple derivation of these, which [also] appears to me to be new.
C. Seelig, Ref. (35), p. 178.
Letter to Besso, dated Zurich, March 1914. See Correspondance, Ref. (73).].
Albert Einstein, Michele Besso, Correspondance, 1903–1955 (edited by Pierre Speziali), Hermann, Paris (1972).
A. Einstein, Sitz. Ber. Preuss. Akad. Wiss. pp. 778–786 (1915).
Einstein remarked explicitly: ‘Mathematics teaches us that all of these covariants can be derived from the Riemann-Christoffel tensor of the fourth rank…. In the problem of gravitation, we are particularly interested in the tensors of the second rank, which can be constructed from these tensors of the fourth rank and the gμv by inner multiplication.’ (Ref. (74), p. 781. Compare with our earlier quotations from Grossmann’s paper.)
Einstein said that on the basis of his considerations ‘the field equations of gravitation may be written in the form Rμv= — y Tμv, since we already know that these equations are covariant with respect to arbitrary transforma-tions of the determinant 1.’ (Ref. (74), p. 783.)
A. Einstein, Sitz. Ber. Preuss. Akad. Wiss. p. 785 (1915).
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A. Einstein, Ref. (79), pp. 799–800.
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Einstein had explained this result, obtained empirically in his second note, submitted on 18 November 1915, entitled ‘Erklärung der Perihelbewegung des Merkur aus der allgemeinen Relativitätstheorie’, Sitz. Ber. Preuss. Akad. Wiss. pp. 831–839 (1915).
Ref. (81), p. 847.
He wrote to Besso again on 21 December 1915: ‘Read the papers Einstein’s! The final release from misery has been obtained. What pleases me most is the agreement with the perihelion motion of Mercury….Even Planck now begins to take the thing seriously, although he still resists it a bit. But he is a splendid human being.’ [See Correspondance, Ref. 73.]
Writing again to Besso on 3 January 1916, he said: ‘The great success with [the theory of] gravitation pleases me extraordinarily. 1 have seriously in mind to write a book in the near future on the special and general theory of relativity….’ [See Correspondance, Ref. 73.]
See R. Courant and D. Hilbert, Methods of Mathematical Physics, Interscience, New York (1953).
See Vorträge über die Kinetische Theorie der Materie und der Elektrizität, B. G. Teubner, Berlin (1914); Hilbert wrote the foreword to these lectures.
O. Blumenthal, Lebensgeschichte, I.E., p. 417 [see Ref. 88].
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J. von Neumann, Grundlagen der Quantenmechanik, Springer, Berlin (1931) (English translation by R. T. Beyer, Princeton (1955)).
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W. K. Clifford’s translation, Ref. 105, p. 69.
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H. Minkowski, Ref. (110), p. 55.
H. Minkowski, Ref. 110, pp. 65–66. See also his lecture at the 80th Naturforscherversammlung (Congress of Natural Scientists) in Cologne on ‘Raum und Zeit’ printed in Phys. Z. 10, 104–111 (1909), where he gave a most illuminating exposition of the concepts of space and time and introduced the notions of ‘world vectors’ and ‘world postulate’.
R. Hargreaves, ‘Integral forms and their connection with physical equations’, Trans. Camb. Phil. Soc. 21, 107–122 (1908). In fact, H. Poincaré already used ict as the fourth coordinate 4 in his memoir ‘Sur la dynamique de l’électron’, Palermo Rend, 21 (1906), which was submitted on 23 June 1905.
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H. von Helmholtz, Ref. (115), p. 193.
H. von Helmholtz, Ref. (115), pp. 194–195. Riemann’s ‘trial’ lecture [Probevorlesung] was published in the Abhandl. kgl. Ges. Wiss. Gött. 13 (1867), although it had appeared as a pamphlet in 1854.
F. Klein, ‘Vergleichende Betrachtungen über neuere geometrische Forschungen’, Erlangen, appeared in December, 1872; reprinted in Math. Ann. 43 (1893) and in Ges. Abh., Vol. I, p. 460; See F. Klein, Vorlesungen, Ref. 103, Vol. II, p. 28.
See p. 7 of Klein’s Erlangen Programme, or Ref. 103, p. 28.
G. Hamel, ‘Die Lagrange-Eulerschen Gleichungen der Mechanik’, Z. Math. u. Phys. 50, 1-57 (1904) (inaugural lecture); See also’Über die virtuellen Verschiebungen in der Mechanik’, Math. Ann. 59, 416–434 (1904).
G. Hamel, Ref. 124, p. 12.
G. Herglotz, ‘Über die Mechanik des deformierbaren Körpers von Standpunkte der Relativi-tätstheorie’, Ann. Phys. (Leipzig) 36, p. 1911.
The name ‘Poincaré group’ was first used by E. P. Wigner in: ‘On Unitary Representations of the Inhomogeneous Lorentz Group’, Annals of Math. 40, 149 (1939).
His papers on the theory of invariants had the unexpected effect of withering, as it were over-night, a “discipline which so far had stood in full bloom.” [H. Weyl, Gesammelte Abhandlungen Vol. 4, Springer-Verlag, New York 1968, p. 124.]
E. Noether, Ref. 131, pp. 238–239.
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Gustav Mie, ‘Grundlagen einer Theorie der Materie (I)’, Ann. Phys. (Leipzig) 37, 511–534 (1912); (II), 39, 1-40 (1912); (III), 40, 1–66 (1913).
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G. Mie, I.E., (I), p. 513.
G. Mie, I.E., (I), p. 512.
G. Mie, Section 35 of (III), in Ref. 135, entitled ‘Das Plancksche Wirkungsquantum’ does not represent a step in this direction.
Constance Reid, Hilbert, Springer, New York, (1970), pp. 140–141.
Einstein-Sommerfeld Briefwechsel (see Ref. 1), p. 30.
A. Einstein, S. B. Preuss. Akad. Wiss. (1915), p. 844.
C. Reid, Hilbert, Springer, New York (1970), p. 142.
Einstein once remarked, ‘The people in Göttingen sometimes strike me, not as if they want to help one formulate something clearly, but as if they only want to show us physicists how much brighter they are than we.’ (Reid, I.E., p. 142.)
C. Reid, Hilbert, p. 142.
Einstein has posed immense problems, has brought forth profound thoughts and unique con-ceptions, and has invented ingenious methods for dealing with them. Mie was able to construct his electrodynamics [on the basis of these], and they have opened up new avenues for the investigation of the foundations of physics.’ (D. Hilbert, see Ref. 97, ‘Die Grundlagen der Physik’, p. 395.)
D. Hilbert, Ref. (97), I, p. 395.
D. Hilbert, Ref. (97), I, p. 396.
D. Hilbert, Ref. (97), I, p. 396.
D. Hilbert, Ref. (97), I, p. 397.
See the remarks in Section HI.3. Emmy Noether had given the proof in its most general form. Hilbert gave a complete proof for a special case (which he called Theorem 2) of the general theorem.
D. Hilbert, Ref. (97), I, pp. 397 - 398.
A. Einstein, Ann. Phys. (Leipzig) 49, 769 (1916), p. 810.
D. Hilbert, Ref. (97), I, p. 403.
D. Hilbert, Ref. (97), I, p. 404.
D. Hilbert, Ref. (97), I, p. 406.
D. Hilbert, Ref. (97), I, p. 407.
C. Seelig, Albert Einstein [Ref. 35], p. 188.
A. Einstein, Ann. Phys. (Leipzig) 49, 769–822 (1916).
A. Einstein, Ref. (165), p. 772.
A. Einstein, Ref. (165), p. 775.
A. Einstein, Ref. (165), p. 779.
F. Kottler, Ann. Phys. (Leipzig) 50, 955 (1916). Kottler had already given, as early as 1912, the expression for the electromagnetic field equations in a generally covariant form (S. B. Akad. Wiss. Wien 121, 1659 (1912)), and Einstein recognized his contribution. ‘Among the papers which deal critically with the general theory of relativity, those of Kottler are particularly remarkable, because this expert has really penetrated into the spirit of the theory.’ [A. Einstein, ‘Über Friedrich Kottiers Abhandlung “Über Einsteins Äquivalenzhypothese und die Gravitation” ’, Ann. Phys. (Leipzig) 51, 639–642 (1916).]
A. Einstein, Ann. Phys. (Leipzig) 51, 639 (1916).
A. Einstein, Ann. Phys. (Leipzig) 51, 639 (1916), esp. pp. 640–641.
E. Kreischmann ‘Über den physikalischen Sinn der Relativitätspostulate, A. Einsteins neue und seine ursprüngliche Relativitätstheorie’, Ann. Phys. (Leipzig) 53, 575–614 (1917).
E. Kretschmann, Ref. (172), p. 576.
E. Kretschmann, Ref. (172), p. 584.
E. Kretschmann, Ref. (172), p. 610.
A. Einstein, Ann. Phys. (Leipzig) 55, 241–244 (1918). He praised the author (Kretschmann) for his sharp wit, but did not find the sharper form of the equivalence principle either valuable or desirable.
A. Einstein, Ann. Phys. (Leipzig) 49, 769 (1916), esp. p. 781.
A. Einstein, Ref. (177), p. 789.
A. Einstein, Ref. (177), pp. 802–803.
A. Einstein, Ref. (177), pp. 803–804. The formal proof of this statement was given by H. Vermeil, Nachr. Ges. Wiss. Göttingen (1917) 334; see also H. Vermeil, Math. Ann. 79 (1918) 289.
A. Einstein, Ref. (177), p. 804.
A. Einstein, Ref. (177), p. 808.
A. Einstein, Ref. (177), p. 810.
A. Einstein, Ref. (177), pp. 810–811.
Einstein had already done this in a paper entitled ‘Eine neue formale Deutung der Maxwellschen Feldgleichungen der Elektrodynamik’, Sitz. Ber. Preuss. Akad. Wiss. (1916), pp. 184–187. (Submitted and read on 3 February 1916.)
C. Seelig, Ref. (35), p. 199.
This value had already been calculated in his communication of 18 November 1915, dealing with the motion of the perihelion of Mercury.
A. Einstein, Ref. (189), (1918), p. 164.
A. Einstein, S.B. Preuss. Akad. Wiss. (1917), p. 143.
A. Einstein, Ref. (193), pp. 143–144.
A. Einstein, Ref. (193), p. 145.
A. Einstein, Ref. (193), p. 148.
A. Einstein, Ref. (193), p. 151.
A. Einstein, Ann. Phys. (Leipzig) 49, 771.
A. Einstein, Ref. (200), p. 776.
Letter from Einstein to M. Besso, dated Berlin, 31 October 1916. [See Ref. (73)]
D. Hilbert, Nachr. Ges. Wiss. Gött., Math. Phys. Kl. (1917), 53–76, in particular p. 53.
D. Hilbert, ‘Die Grundlagen der Physik’, Math. Ann. 92, 1–32 (1924). This is a slightly condensed version of Hilbert’s two memoirs of 1915 and 1916, which were published in the Proceedings of the Göttingen Academy. The third axiom is the one which expresses H as a sum of a gravitational term K and an electrical term L. Axiom IV was stated in this paper (p. 11). [This paper was reprinted in Hilbert’s Gesammelte Abhandlungen, Vol. 3, pp. 258–289.]
D. Hilbert, Nachr. Gött. (1917), p. 54.
D. Hilbert, Nachr. Gött. (1917), p. 57.
W. Pauli, I.e. in Ref. 106, Section 22, ‘Reality relations’, English edition, pp. 62–64.
H. Reichenbach, Axiomatik der relativistischen Raum-Zeit -Lehre, Vieweg, Braunschweig (1965); English translation by M. Reichenbach, University of California Press, Berkeley (1969), pp. 179–181. It seems to be quite remarkable that Reichenbach ignored Hilbert’s system of axioms completely.
D. Hilbert, Nachr. Gött. (1917), p. 61.
D. Hilbert, Nachr. Gött. (1917), pp. 63–64.
D. Hilbert, Nachr. Gött. (1917), p. 66.
D. Hilbert, Nachr. Gött. (1917), p. 70.
Einstein oscillated between the opinions whether he should take the singular solution as the one corresponding to the real particle (electron, etc.) or not.
W. Pauli, Theory of Relativity, p. 145, footnote 277 (see Ref. 106).
Einstein-Lorentz correspondence, The Hague, The Netherlands.
H.A. Lorentz, Versl. K. Akad. Wetensch. Amsterdam 23, 1073 (1915); Proc. K. Akad. Amsterdam 19, 751 (1915); reprinted in H.A. Lorentz, Collected Papers, Vol.5, The Hague (1937), pp. 229–245.
H. A. Lorentz, Ref. (217a), p. 1073, or Collected Papers, Vol. 5, p. 229.
H. A. Lorentz, Versl. K. Akad. Wetensch. Amsterdam 24, 1389, 1759; 25, 468, 1380 (1916); Proc. K. Akad. Amsterdam 19, 1341, 1354, 20, 2, 20 (1916), reprinted in Collected Papers, Vol. 5, pp. 246 - 313.
H. A. Lorentz, Collected Papers, Vol. 5, p. 246.
H. A. Lorentz, Ref. 220 ), p. 246.
This part is contained in the second paper in H. A. Lorentz, Versl. K. Akad. Wetensch. Amsterdam 24, 1759 (1916).
A. Einstein, ‘Hamiltonsches Prinzip und allgemeine Relativitätstheorie’, Sitz. Ber. Preuss. Akad. Wiss. (1916), pp. 1111–1116.
A. Einstein, Ref. (224), p. 1111.
F. Klein, Nachr. Ges. Wiss. Gött., Math. Phys. Kl. (1918), pp. 171–189.
He proudly noted: ‘As one can see, there is nothing more to be really calculated in the integrals, except to make the obvious use of the elementary formulas of the classical variational calculation.’ (F. Klein, Ref. (226), p. 172)
F. Klein, Ref. (226), p. 185.
F.Klein, Nachr. Ges. Wiss. Gott. (1918), pp. 394–423 (submitted and read on 6 December 1918 ).
W. de Sitter, Proc. Acad. Sci. Amsterdam 19, 1217; 20, 229 (1917).
F. Klein, Nacht. Gott. (1918), Ref. (226), pp. 394–395.
F. Klein, Ref. (232), p. 399.
F. Klein, ‘Zu Hilberts erster Note iiber die Grundlagen der Physik’, Nachr. Ges. Wiss. Gott (1917), pp. 469–489 (read on 25 January 1917). Klein’s aim was to simplify Hilbert’s calculations of the variational problem and obtain 4 a clearer insight into the significance of the conservation laws’. [F. Klein, I.E., p. 469].
F. Klein, Ref. (234), p. 475.
Because of all this I can hardly believe that it is appropriate to regard the arbitrarily chosen quantities tva as the energy-components of the gravitational field.’ (Ref. (234), p. 477.)
D. Hilbert, Nachr. Gott. (1917), p. 477 - 480.
D. Hilbert, Ref. (238), p. 477. Hilbert also mentioned that Emmy Noether, whose help he had requested in his study of the question of energy conservation over a year previously, had, in fact, studied the question thoroughly and arrived at Klein’s conclusions. Klein had also seen Noether’s proof after writing down his own derivation. (Ref. (234), p. 476.)
D. Hilbert, Ref. (238), p. 480.
F. Klein, Ref. (234), pp. 481-482.
H. Weyl, Raum-Zeit-Materie, Leipzig (1918); the fourth edition (1921) was translated as Space-Time-Matter, Methuen, London (1922). Dover edition, New York (1952). The quotations are from the Dover edition, p. 102.
T. Levi-Civita, Rend. del. Circ. Mat. di Palermo 42, 173 (1917).
G. Hessenberg, ‘Vektorielle Begründung der Differentialgeometrie’, Math. Am. 78, 187 (1917).
H. Weyl, Math. Z. 2, 384 (1918). See also Weyl, Sitz. Ber. Preuss. Akad. Wiss. (1918), p. 465.
This follows by integrating the Equation (101), and noting that/is a constant throughout the space if (frßdxt* is a total differential, which means that the expressions
A. Einstein, Sitz. Ber. Preuss. Akad. Wiss. (1918), p. 478.
A. S. Eddington, Proc. Roy. Soc. (London) A99, 104 (1921); A. Einstein, Sitz. Ber. Preuss. Aad. Wiss. A23, 32, 76, 137.
T. Kaluza, Sitz. Ber. Preuss. Akad. Wiss. (1921), p. 27. This theory was extended by O. Klein in several papers: Z.Phys. 37, 895 (1926); Z. Phys. 36,188 (1927), /. Phys. Rad. 8,242 (1927); Ark. Mat. Ast. Fys. 34, No. 1 (1946).
O. Klein, Z. Phys. 37, 903 (1926).
O. Veblen and D. Hoffman, ‘Projective Relativity’, Phys. Rev. 36, 810 (1930).
Letter to H. Weyl, on 23 November 1916 (quoted from C. Seelig, Ref. (35), p. 200).
D. Hilbert, ‘Die Grundlagen der Physik’, Math. Ann. 92,1–32 (1924), reprinted in D. Hilbert, Gesammelte Abhandlungen, Berlin (1935), pp. 258–289.
D. Hilbert, pp. 1–2 (Ges. Abh. 3, pp. 258–259 ).
A. Einstein, Sitz. Ber. Preuss. Akad. Wiss. (1919), pp. 348–356.
A. Einstein, Ref. (260), p. 350.
A. Einstein, Ref. (260), p. 351.
A. Einstein, Ref. (260), pp. 355-356.
A. Einstein to M. Besso, dated Berlin, 5 January 1929 [see Ref. 73]. The paper in question was ‘Einheitliche Feldtheorie’, Sitz. Ber. Preuss. Akad. Wiss. (1929), pp. 2–7.
P. A. M. Dirac, Lecture on ‘Methods in Theoretical Physics’, in the series, From A Life of Physics, Trieste, Italy (June, 1968 ).
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Mehra, J. (1973). Einstein, Hilbert, and the Theory of Gravitation. In: Mehra, J. (eds) The Physicist’s Conception of Nature. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-2602-4_7
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