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What did Kramers and Kronig do and how did they do it?
Open accessAbstract
Over time the account of how the Kramers–Kronig (dispersion) relations between the real and imaginary parts of response functions were derived in 1926 and 1927 has been transmogrified into anecdotes about what might have been done but was not. Although Kramers obtained both members of a pair of relations, Kronig obtained only one. Both authors appealed to specific models of an atomic gas rather than to the general arguments about linearity, causality and analyticity in modern model-independent derivations. Kramers merely speculated on whether the specific results he obtained might have a more general validity. Neither author showed that a signal cannot travel faster than c in any medium for which the dispersion relations are satisfied. Indeed, they did not mention, even obliquely, signal speeds and causality. Despite their magical aura, Kramers–Kronig relations are translations into somewhat cryptic frequency language of statements clearer in time language.
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Citations
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Metadata
- Authors
- Bohren, C. F.
- Affiliations
- Pennsylvania State University (US)
- Corresponding author
- Bohren, Craig F
- ORCID
- Bohren, Craig F
- Venue
- European Journal of Physics
- Publisher
- IOP Publishing
- Published
- 2010-03-30
- Volume
- 31
- Issue
- 3
- Pages
- 573-577
- ISSN
- 0143-0807 (ISSN-L)
- 1361-6404
- OpenAlex
- W2026692979
- Cited by
- 112
- References
- 11
- Citations by year
- 2026: 4 · 2025: 9 · 2024: 6 · 2023: 2 · 2022: 9 · 2021: 5 · 2020: 8 · 2019: 34 · 2018: 4 · 2017: 8 · 2016: 4 · 2015: 5 · 2014: 6 · 2013: 2 · 2012: 3
- FWCI
- 17.73
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- European Journal of Physics (publishedVersion)
- Topics
- Social Sciences › Arts and Humanities › History and Philosophy of Science › History of Science and Medicine
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Quantum and Classical Electrodynamics
- Social Sciences › Arts and Humanities › History and Philosophy of Science › Historical Studies and Socio-cultural Analysis
- Keywords
- Kramers-Kronig relations, dispersion relation, response functions, causality, analyticity, signal propagation speed, history of physics, Kramer
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