Download In The Blink Of An Eye: How Vision Sparked The Big Bang Of by Andrew Parker PDF

By Andrew Parker

Approximately 550 million years in the past, there has been actually an explosion of lifestyles types, as the entire significant animal teams abruptly and dramatically seemed. even if a number of books were written approximately this unbelievable occasion, referred to as the Cambrian explosion, none has defined why it happened. certainly, none was once capable of. right here, for the 1st time, Oxford zoologist Andrew Parker unearths his thought of this nice flourishing of lifestyles. Parker's arguable yet more and more authorized "Light change Theory" holds that it was once the advance of imaginative and prescient in primitive animals that brought on the explosion. Drawing on facts not only from biology, but additionally from geology, physics, chemistry, historical past, and artwork, within the Blink of a watch is the interesting account of a tender scientist's highbrow trip, and a party of the medical strategy.

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They are the harmonic oscillator and the hydrogen atom, the only two for which a classical vision could hold long enough. 3 Matrix Mechanics 21. The failure of the "first quantum theory" was becoming obvious in the early 1920s. Bohr stressed in his lectures the urgent need for a deeper and bolder theory, even if a break with traditional thinking was necessary. The " new quantum theory" was discovered soon after in two versions that were quite different and whose histories are somewhat intermingled.

The first one is about language. Can there be a universal language for interpretation? Can one speak with the same words, under the same constraints of logic, of an atom and of the commonplace world we can see and touch? This question was perhaps answered too soon by the idea of complementarity. 2. The second problem deals with quantum-classical correspondence. Is classical physics a direct consequence of quantum mechanics? The main difficulty of this question is not so much to find a mathematical correspondence between the Schrodinger equation and the classical laws of dynamics but to reconcile quantum probabilism and classical determinism.

This conflict with common sense raised a huge difficulty and was in opposition with everything mathematics had previously been able to do in physics. In classical physics, mathematical symbols can make physical concepts clearer and more precise. When a position, a velocity, or a law of dynamics is expressed by some coordinates, derivatives, and differential equations, the mathematical symbols add to the clarity of the physical concept. There is a full agreement between the theoretical tool and the reality it stands for.

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