By Anthony Leggett
Within the difficulties of Physics, first released in 1987, Anthony Leggett provides an summary of the frontiers of physics on the time, aimed toward the final reader. CERN Courier, Vol forty seven No 6, July/August 2007 First released in 1987 this reissue continues to be topical because it specializes in difficulties confronted by way of physicists, instead of solutions they supply. for example, commentary of the Higgs boson wouldn't be the tip of the tale. Nature Physics, Vol.2 November 2006.
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Sample text
This decay is certainly not forbidden by energy conservation, but it is forbidden, inter alia, by another conservation law, which is believed to be equally universal — namely, the conservation of total electric charge (the proton has charge + e, the two electrons — 2e). I will return to the general question of conservation laws later. As we saw above, the force which holds the electrons in the atom is the familiar electrostatic attraction between unlike charges (the negatively charged electrons and the positively charged nucleus).
What kinds of assumptions do we, consciously or unconsciously, make about the nature and role of experiment? Setting the stage 33 In the first place, we assume that the results of experiments are intersubjective—that is, that they do not depend on who does the experiment or looks at the result. , then I should be able to confirm that it does indeed read that time, and so should any other person who is familiar with the usual symbols and conventions. Of course, for all sorts of trivial reasons there are always going to be minor disagreements, but we implicitly accept that by using better spectacles, noise isolation, and so on, they can be reduced to as low a level as we like.
This is actually a special case of a much more general and, to many people, worrying paradox in the foundations of quantum mechanics to which I shall return in Chapter 5. Over the last sixty years, the formalism of quantum mechanics, augmented by the generalizations necessary to accommodate special relativity and field theory, has had a success which it is almost impossible to exaggerate. It is the basis of just about everything we claim to understand in atomic and subatomic physics, most things in condensed-matter physics, and to an increasing extent much of cosmology.