Straight from the mind of a genius: Erwin Schrodinger on physics of reality
This is a collection of nine essays eight of which originally appeared under the title Science and the Human Temperament. The ninth chapter contains the address given by Schrödinger on the occasion of the Nobel Prize award for his discovery of wave mechanics. His profound knowledge and deep philosophical thought are reflected in each chapter as he walks through the nature of reality as perceived by classical and quantum physics. The critical issues discussed are: Is cause - effect relationship required for physical reality? Does statistical and chance (probabilities) replace cause and effect? How quantum uncertainty affects physical reality? Could we determine the initial state of an electron? Does positivism makes sense in quantum world. These are some of the questions asked, and he tries to answer them with an easy to understand language. This work is another example of this great genius who was curious about life and the universe from a very young age.
Schrodinger credits Franz Exener, Fritz Hasenoehrl, and David Hume for the idea of departing from mechanical concept of cause and effect. He suggests statistical outcome to replace pure cause - effect relationship. But practical impossibility to determine the initial state of an electron in spacetime precludes from understanding the final (effected) state of the electron. Statistical laws are even more clearly manifested when the behavior of each individual particle is undetermined. It is likely chance (probability) lies at the root of casualty. If the behavior of each atom in every single event is determined by casualty then the details of each individual cause - effect events in a multi-electron system must be registered (positivism,) in reality only the statistical outcome is registered. Thus chance is primarily important for the observed reality. The second alternative is the compulsion of physical law and not probability (chance) and statistical outcome would determine reality. An experiment can not decide between these two possibilities because scientific reasoning will allow us either to derive chance from law or law from chance. If mass, position and velocity of an entity is precisely known at the very start, and then the future behavior is easily predicted by classical physics. But classical physics does not make sense in quantum world (subatomic level), because identical conditions at a point in time do not invariably lead to identical results, but it results in identical statistical outcome; the relative frequencies of various possible events. According to Heisenberg's uncertainty principle, the velocity for a precisely defined position in space is not determinable. The second problem is determining the actual state of an electron. For example, it does not have a definite orbit around the nucleus that can be virtually detected, and it is in a state of perpetual motion around the nucleus without losing kinetic energy contrary to laws of classical physics. Experiments can measure only the energy level difference recorded in the form spectra. Virtual observation is essential to confirm the real existence of an object according classical physics. The exact registration of electromagnetic field generated by moving electron is precluded by Heisenberg uncertainty principle. Uncertainty principle is not an incomplete knowledge. The current view does not accept either ubiety or velocity as permanent objective realities. The word finding a particle at point A does not imply that it was there before. Our measuring device has brought it there or we disturbed its velocity while measuring and this doesn't imply it had a value. The implications of being and having are not the same even though the positivist philosophy concludes that they are one and the same.