Generalized Einstein Relations
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Generalized Einstein Relations between Absorption and Emission Spectra in the Electric-Dipole Approximation
arXiv:2603.10416v2 Announce Type: replace Abstract: Recently, Ryu et al. showed that two broadened bands connected by a set of four Einstein-coefficient spectra for stimulated and spontaneous single-photon transitions will obey detailed balance at equilibrium if the spectra satisfy generalized Einstein relations. Here, quantum mechanical expressions for Einstein-coefficient spectra are obtained in the electric-dipole approximation using an intramolecular Boltzmann distribution and the...
Relativity from the Perspectives of Observers
Announce Type: new Abstract: This paper reviews the role of observers in the development of relativity theory, from special relativity to general relativity, emphasizing that observer-dependent descriptions are as fundamental as the covariance of physical laws. This paper reviews the role of observers in the development of relativity theory, from special relativity to general relativity, emphasizing that observer-dependent descriptions are as fundamental as the covariance of physical laws....
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Strange 'spacetime crystals' could give birth to tiny black holes
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