The two essays here published for the first time are separated by an interval of thirty-five years. The first and longer one was written shortly before my appointment as Max Planck's successor in Berlin, and a few months before the idea of what is now called wave mechanics began for a while to monopolise my whole interest; the second and shorter one dates from two years after my appointment as Professor Emeritus at the University of Vienna. The two are closely related in theme, and, of course, also connect with many ideas which I have publicly advocated in the intervening period. I do not know whether it is presumptuous of me to suppose that readers will be interested in ‘my’ view of the world. The critics, not myself, will decide on this. But a gesture of decorous modesty is usually in fact a disguise for arrogance. I should prefer not to be guilty of this. Anyway, the total (I have counted) is about twenty-eight to twenty-nine thousand words. Not an excessive size for a view of the world. There is one complaint which I shall not escape. Not a word is said here of acausality, wave mechanics, indeterminacy relations, complementarity, an expanding universe, continuous creation, etc. Why doesn't he talk about what he knows instead of trespassing on the professional philosopher's preserves? Ne sutor supra crepidam .
The two essays here published for the first time are separated by an interval of thirty-five years. The first and longer one was written shortly before my appointment as Max Planck's successor in Berlin, and a few months before the idea of what is now called wave mechanics began for a while to monopolise my whole interest; the second and shorter one dates from two years after my appointment as Professor Emeritus at the University of Vienna. The two are closely related in theme, and, of course, also connect with many ideas which I have publicly advocated in the intervening period. I do not know whether it is presumptuous of me to suppose that readers will be interested in ‘my’ view of the world. The critics, not myself, will decide on this. But a gesture of decorous modesty is usually in fact a disguise for arrogance. I should prefer not to be guilty of this. Anyway, the total (I have counted) is about twenty-eight to twenty-nine thousand words. Not an excessive size for a view of the world. There is one complaint which I shall not escape. Not a word is said here of acausality, wave mechanics, indeterminacy relations, complementarity, an expanding universe, continuous creation, etc. Why doesn't he talk about what he knows instead of trespassing on the professional philosopher's preserves? Ne sutor supra crepidam .
When Schrödinger returned from his summer holidays for the winter semester of the academic year 1925/26, he would have been quite unaware that he was on the verge of an outburst of creative activity that would change forever the world of physics. He had just reviewed and codified his personal world view and it was unlikely that his philosophical outlook would change in any revolutionary way. He had set down his belief in Vedanta and thus in Schopenhauer, through whom the Kantian a priori categories of space and time had been refurbished. During five carefree years in Switzerland, he had been insulated from both the hypocrisy of Vienna and the brutality of German politics. It would not be surprising if Swiss society, with its deep roots in economic security, had made him more conservative in other ways. His more unconventional beliefs, he kept to himself, and neither his inaugural lecture nor My World View was published at this time. Hermann Weyl once said that Schrödinger ‘did his great work during a late erotic outburst in his life’. His marriage with Anny was at a high point of disagreement and tension, with constant talk of breakup and divorce. Their Zürich circle provided ample opportunities for amorous adventures, and if Erwin cared to venture outside the usual academic liaisons, both Weyl and Debye were available as competent guides to the uninhibited night life of the city. Before the breakthrough The semester began on October 15, and Schrödinger had his usual heavy teaching schedule, five hours a week on Theory of Electricity, two hours on Theory of Spectra, a weekly seminar for the electricity course, and the joint seminar with E.T.H., which met for two hours every fortnight. Pieter Debye suggested that Erwin should give a seminar talk on the de Broglie thesis, which had just been published in Annales de Physique .
When schrödinger returned from his summer holidays for the winter semester of the academic year 1925/26, he would have been quite unaware that he was on the verge of an outburst of creative activity that would change forever the world of physics. He had just reviewed and codified his personal world view and it was unlikely that his philosophical outlook would change in any revolutionary way. He had set down his belief in Vedanta and thus in Schopenhauer, through whom the Kantian a priori categories of space and time had been refurbished. During five carefree years in Switzerland, he had been insulated from both the hypocrisy of Vienna and the brutality of German politics. It would not be surprising if Swiss society, with its deep roots in economic security, had made him more conservative in other ways. His more unconventional beliefs, he kept to himself, and neither his inaugural lecture nor My World View was published at this time. Hermann Weyl once said that schrödinger ‘did his great work during a late erotic outburst in his life’. His marriage with Anny was at a high point of disagreement and tension, with constant talk of breakup and divorce. Their zürich circle provided ample opportunities for amorous adventures, and if Erwin cared to venture outside the usual academic liaisons, both Weyl and Debye were available as competent guides to the uninhibited night life of the city. Before the breakthrough The semester began on October 15, and schrödinger had his usual heavy teaching schedule, five hours a week on Theory of Electricity, two hours on Theory of Spectra, a weekly seminar for the electricity course, and the joint seminar with E.T.H., which met for two hours every fortnight. Pieter Debye suggested that Erwin should give a seminar talk on the de Broglie thesis, which had just been published in Annales de Physique .
Now I shall try to give you an idea of the way in which physicists at present endeavour to overcome this failure. One might term it an ‘emergency exit’, though it was not intended as such, but as a new theory. I mean, of course, wave mechanics. (Eddington called it ‘not a physical theory but a dodge—and a very good dodge too’.) The situation is about as follows. The observed facts (about particles and light and all sorts of radiation and their mutual interaction) appear to be repugnant to the classical ideal of a continuous description in space and time. (Let me explain myself to the physicist by hinting at one example: Bohr's famous theory of spectral lines in 1913 had to assume that the atom makes a sudden transition from one state into another state, and that in doing so it emits a train of light waves several feet long, containing hundreds of thousands of waves and requiring for its formation a considerable time. No information about the atom during this transition can be offered.) So the facts of observation are irreconcilable with a continuous description in space and time 5 it just seems impossible, at least in many cases.
Now I shall try to give you an idea of the way in which physicists at present endeavour to overcome this failure. One might term it an ‘emergency exit’, though it was not intended as such, but as a new theory. I mean, of course, wave mechanics. (Edding-ton called it ‘not a physical theory but a dodge— and a very good dodge too’.) The situation is about as follows. The observed facts (about particles and light and all sorts of radiation and their mutual interaction) appear to be repugnant to the classical ideal of a continuous description in space and time. (Let me explain myself to the physicist by hinting at one example: Bohr's famous theory of spectral lines in 1913 had to assume that the atom makes a sudden transition from one state into another state, and that in doing so it emits a train of light waves several feet long, containing hundreds of thousands of waves and requiring for its formation a considerable time. No information about the atom during this transition can be offered.) So the facts of observation are irreconcilable with a continuous description in space and time; it just seems impossible, at least in many cases. On the other hand, from an incomplete description—from a picture with gaps in space and time—one cannot draw clear and unambiguous conclusions; it leads to hazy, arbitrary, unclear thinking—and that is the thing we must avoid at all costs! What is to be done?
Be this as it may, it seems worth our while to try to examine the matter from various angles. A point of view that I have previously touched on in these lectures and that does suggest itself is this, that our present difficulties in physical science are bound up with the notorious conceptional intricacy inherent in the idea of the continuum. But this does not tell you much. How are they bound up? What precisely is the mutual relationship? If you envisage the development of physics in the last half-century, you get the impression that the discontinuous aspect of nature has been forced upon us very much against our will. We seemed to feel quite happy with the continuum. Max Planck was seriously frightened by the idea of a discontinuous exchange of energy, which he had introduced (1900) in order to explain the distribution of energy in black-body-radiation. He made strong efforts to weaken the hypothesis, and, if possible, to get away from it, but in vain. Twenty-five years later the inventors of wave mechanics indulged for some time in the fond hope that they had paved the way of return to a classical continuous description, but again the hope was deceptive.
When the Great War began in August, 1914, Erwin schrödinger at the age of twenty-seven was a Privatdozent at Vienna University, at the outset of a promising career in physics. He served throughout the war as a commissioned officer in the Austrian fortress artillery, first on the Italian front and later assigned to the imperial meteorology department in Vienna. On October 7,1915, his revered professor of theoretical physics, Fritz Hasenöhrl, was killed by a grenade in an Italian attack on Mount Plaut in the South Tirol. Early in 1918, schrödinger received word that he was being seriously considered for the position of Professor Extraordinarius [associate professor] in theoretical physics at the University of Czernowitz. ‘I made up my mind to lecture there on honest theoretical physics, first of all according to the pattern of the splendid lectures of my beloved teacher Fritz Hasenöhrl, fallen in the war, but besides to concern myself with philosophy, deeply immersed as I then was in the writings of Spinoza, Schopenhauer, Mach, Richard Semon, and Richard Avenarius. My good angel intervened, since soon Czernowitz no longer belonged to us. So nothing came of it. I had to stick to theoretical physics, and, to my astonishment, something occasionally emerged from it.’ Even on active duty, schrödinger found time to read deeply in philosophy, and indeed it was the only thing that kept him from despair during the long years of senseless killing and destruction. A serious interest in philosophy was not unusual among German and Austrian physicists, but with schrödinger at that time it was so important that he was even tempted to sacrifice scientific research to devote his life to philosophical study. Much later, in 1963, Max Born wrote: ‘I am convinced that theoretical physics is actually philosophy. It has revolutionized fundamental concepts, e.g., about space and time (relativity), about causality (quantum theory), and about substance and matter (atomistics). It has taught us new methods of thinking (complementarity), which are applicable far beyond physics.’ By his discovery of wave mechanics, Erwin schrödinger contributed in a major way to this revolutionary change in our view of the world [ Weltanschauunung ].