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Many-Particle Systems, 5, David Peak
Many-Particle Systems, 5, David Peak
Many Particles
Photons as T → 0 K
Photons are massless bosons. Because they are massless, any number of them can be added or subtracted without changing the photon system energy. (For example, a 1 eV photon can be exchanged for one hundred 0.01 eV photons, without changing system energy.) As a result, the chemical potential for photons is zero.