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- W3100017414 abstract "We discuss carefully the blackbody approximation, stressing what it is (a limit case of radiative transfer), and what it is not (the assumption that the body is perfectly absorbing, i.e. black). Furthermore, we derive the Planck spectrum without enclosing the field in a box, as is done in most textbooks. Athough convenient, this trick conceals the nature of the idealization expressed in the concept of a blackbody: first, the most obvious examples of approximate blackbodies, stars, are definitely not enclosed in boxes; second, the Planck spectrum is continuous, while the stationary modes of radiation in a box are discrete. Our derivation, although technically less elementary, is conceptually more consistent, and brings the opportunity to introduce to students the important concept of local density of states, via the resolvent formalism." @default.
- W3100017414 created "2020-11-23" @default.
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- W3100017414 date "2011-06-27" @default.
- W3100017414 modified "2023-09-26" @default.
- W3100017414 title "A blackbody is not a blackbox" @default.
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- W3100017414 doi "https://doi.org/10.1088/0143-0807/32/5/002" @default.
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