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| Larmor | |
|---|---|
| Name | Joseph Larmor |
| Birth date | 1857-07-11 |
| Death date | 1942-03-19 |
| Nationality | British |
| Fields | Mathematics, Physics |
| Workplaces | Trinity College, Cambridge, University of Cambridge, St John's College, Cambridge |
| Alma mater | Trinity College, Cambridge |
| Known for | Larmor formula; Larmor precession; contributions to electromagnetism; theoretical work related to special relativity |
Larmor Joseph Larmor was an Irish-born British theoretical physicist and mathematician whose work influenced contemporary figures such as James Clerk Maxwell, Hendrik Lorentz, Albert Einstein, Hermann Minkowski, and Arthur Eddington. His contributions to electrodynamics, celestial mechanics, and atomic theory intersected with developments at institutions including Trinity College, Cambridge, Royal Society, University of Cambridge, St John's College, Cambridge, and scientific debates involving Paul Dirac and Niels Bohr. Larmor’s name designates several physical principles used in contexts ranging from synchrotron radiation to magnetic resonance imaging.
The surname derives from Irish and Norman influences similar to families associated with regions like County Antrim and cultural ties with institutions such as Royal Belfast Academical Institution and Queen's University Belfast. In scientific literature the term appears attached to formulas and effects that are cited alongside work by Hendrik Lorentz, J. J. Thomson, Ernest Rutherford, Maxwell Garnett, and referenced in reviews by Lord Rayleigh and William Henry Bragg. Usage of the name in textbooks aligns with curricula from University of Oxford, Imperial College London, University of Cambridge, and lecture series at Cavendish Laboratory.
The Larmor formula gives the power radiated by an accelerating nonrelativistic point charge, often invoked in analyses involving J. J. Thomson, Paul Langevin, Sir James Jeans, P. A. M. Dirac, and problems treated in treatises by H. A. Lorentz and Max Born. Applications cite experiments by Heinrich Hertz, instrumentation at CERN, and theoretical frameworks used by Lev Landau and Evgeny Lifshitz. Derivations appear in monographs alongside chapters by John David Jackson, Richard Feynman, Linus Pauling, Enrico Fermi, and are applied in contexts studied by George Airy, Edmund Whittaker, G. H. Hardy, and Arthur Eddington.
Larmor precession describes the precessional motion of a magnetic dipole in an external magnetic field and introduces the Larmor frequency used in technologies developed by Raymond Damadian, Paul Lauterbur, and Peter Mansfield for imaging techniques associated with Nobel Prize in Physiology or Medicine. The concept is taught in courses at Massachusetts Institute of Technology, Stanford University, University of California, Berkeley, and features in research by Felix Bloch, Edward Purcell, Isidor Rabi, Richard Ernst, and instrumentation by General Electric and Siemens. Phenomena related to the concept are analyzed in experiments by Erwin Schrödinger, Werner Heisenberg, Wolfgang Pauli, Max Planck, and are central to spectroscopy methods developed by Kurt Wüthrich.
Larmor theorem concerns the equivalence between rotation in physical space and the effect of a magnetic field on charged particle motion, a principle that interfaces with transformations studied by Hermann Minkowski, Albert Einstein, Henri Poincaré, Hendrik Lorentz, and frame analyses in texts by Noether. It is applied in derivations connected to special relativity, referenced in correspondence with Paul Dirac and Maxwell Garnett, and discussed in the context of magnetohydrodynamics examined by Eugene Parker and Sir Horace Lamb. Mathematical formulations echo work by Arthur Cayley, James Joseph Sylvester, George Gabriel Stokes, and are employed in analyses presented at meetings of the Royal Society and International Congress of Mathematicians.
Principles bearing the name are central to technologies and fields associated with magnetic resonance imaging, Nuclear Magnetic Resonance, synchrotron radiation facilities like European Synchrotron Radiation Facility, and accelerator physics at CERN and SLAC National Accelerator Laboratory. They underpin theoretical treatments in astrophysics studies of pulsars, magnetars, and radiative processes in research by Subrahmanyan Chandrasekhar, Fred Hoyle, Martin Rees, and Vera Rubin. Larmor-related concepts appear in semiconductor and solid-state research at Bell Labs, quantum information experiments at IBM Research, and precision measurement projects led by National Institute of Standards and Technology and observatories including Hubble Space Telescope programs.
Joseph Larmor’s career unfolded during the late Victorian and Edwardian eras, with intersections involving figures such as James Clerk Maxwell, Lord Kelvin, J. J. Thomson, Ernest Rutherford, Arthur Eddington, and institutions like Trinity College, Cambridge, Cavendish Laboratory, and Royal Society. Biographical treatments situate him among contemporaries including William Thomson, 1st Baron Kelvin, G. H. Hardy, E. T. Whittaker, Arthur Stanley Eddington, and Henry Moseley. His correspondence and reviews connected him to theorists such as Hendrik Lorentz, Albert Einstein, Hermann Minkowski, Paul Dirac, and he engaged in debates that related to developments recognized by awards like the Nobel Prize in Physics and honors conferred by bodies such as the Royal Society and British Academy.
Category:Physicists