George Tiktopoulos
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| George Tiktopoulos | |
|---|---|
 George Tiktopoulos | |
| Native name | Γεώργιος Τικτόπουλος |
| Born | |
| 🏫 Education | National Technical University of Athens University of Chicago |
| 💼 Occupation | |
George Tiktopoulos Greek: Γεώργιος Τικτόπουλος; (1931-2021) was a Greek theoretical physicist who did research on elementary particle physics and quantum field theory [1].
Biography[edit]
George Tiktopoulos was born in Thessaloniki, Greece in 1931. He graduated from the School of Mechanical and Electrical Engineering of the National Technical University of Athens [1]. After graduation he has worked for a short period as an engineer, while at the same time he was studying mathematics.[citation needed]
He then went to Chicago IL, USA where he started his graduate studies and obtained a PhD degree in theoretical physics with distinction [2]. His thesis concerned the asymptotic behavior of Feynman diagrams [3]. Throughout his long career he has worked for academic institutions in both USA and Europe such as Princeton, Rockefeller University, UCLA, École Normale Supérieure, Orsay, Saclay, Brookhaven National Laboratory, University of Wisconsin, Aspen and CERN [2].
In 1976 he decided to return to Greece, where he joined the Institute of Nuclear Physics at the National Centre of Scientific Research Demokritos in Athens. In 1978 he accepted a professorship at the National Technical University of Athens, where he served as first head of the theory group [1]. He has supervised many Ph.D. thesis in theoretical high energy physics and continued his teaching work long after his retirement.
Scientific work[edit]
His most important contribution to particle physics and the Standard Model concerned the unique properties of gauge theories. In his work with John Michael Cornwall and David N. Levin it is shown that the Higgs field in the electroweak interactions of the Standard Model restores the unitarity bound in Script error: No such module "Subatomic particle".+ Script error: No such module "Subatomic particle". → Script error: No such module "Subatomic particle". + + Script error: No such module "Subatomic particle". − process, an important problem for previous theories of the weak interactions[4]. In another paper with the same colleagues, it is shown that gauge theories are the only renormalizable theories of massive vector particles and that the existence of Lie groups of internal symmetries in particle physics can be traced to the requirement of renormalizability [5]. His most famous work concerned the infrared behavior of gauge theories, where one of the equations bear his name (the Cornwall-Tiktopoulos equation) [6] [7]. In the words of Gerard ‘t Hooft: "..a crucial argument was added to this by Chris Llewellyn-Smith and by John Cornwall, David Levin, and George Tiktopoulos; they showed that requiring unitarity implies that the only such theories are gauge theories..".[8]
Selected publications[edit]
- Uniqueness of spontaneously broken gauge theories, Phys. Rev. Lett vol. 30., 1973, pp. 1268–1270 doi:10.1103/PhysRevLett.30.1268
- Derivation of Gauge Invariance from High-Energy Unitarity Bounds on the S Matrix, Phys. Rev. D, vol. 10, 1974, pp. 1145 doi:10.1103/PhysRevD.10.1145
- Infrared Behavior of non-abelian gauge theories, Phys. Rev. D, vol. 13, 1976, pp. 3370-3397 part 2, Phys. Rev. D, Vol. 15, 1977, 2397 doi:10.1103/PhysRevD.15.2937
- Infrared behavior of non-Abelian gauge theories II, Phys. Rev. D, vol. 15, 1977, pp. 2937-2958 doi:10.1103/PhysRevD.15.2937
A full publication list can be found in inspire
References[edit]
- ↑ 1.0 1.1 1.2 "George Tiktopoulos". National Technical University of Athens. Theoretical Particle Physics Group. April 15, 2021. Retrieved January 20, 2022.
- ↑ 2.0 2.1 "INSPIRE". information platform for High Energy Physics community
- ↑ G.Tiktopoulos PhD Thesis, University of Chicago, Dept. of Physics, 1963. Reprinted from the Physical review Tiktopoulos, George (1963). "High-Energy Behavior of Feynman Amplitudes". Phys. Rev. 131 (1): 480–490. Bibcode:1963PhRv..131..480T. doi:10.1103/PhysRev.131.480.
- ↑ Cornwall, J.M.; Levin, D.N.; Tiktopoulos, G. (1973). "Uniqueness of spontaneously broken gauge theories". Phys. Rev. Lett. 30 (25): 1268–1270. Bibcode:1973PhRvL..30.1268C. doi:10.1103/PhysRevLett.30.1268.
- ↑ Cornwall, J.M; Levin, D.N; Tiktopoulos, G. (1974). "Derivation of Gauge Invariance from High-Energy Unitarity Bounds on the S Matrix". Phys. Rev. D. 10 (12): 1145. Bibcode:1974PhRvD..10.1145C. doi:10.1103/PhysRevD.10.1145.
- ↑ Cornwall, J.M.; Tiktopoulos, G. (1976). "Infrared behavior of non-Abelian gauge theories". Phys. Rev. D. 13 (12): 3370–3397. Bibcode:1976PhRvD..13.3370C. doi:10.1103/PhysRevD.13.3370.
- ↑ Cornwall, J.M.; Tiktopoulos, G. (1977). "Infrared behavior of non-Abelian gauge theories. II". Phys. Rev. D. 15 (10): 2937–2958. Bibcode:1977PhRvD..15.2937C. doi:10.1103/PhysRevD.15.2937.
- ↑ Hoddeson, L. (1997). The Rise of the Standard Model: A History of Particle Physics from 1964 to 1979. Cambridge University Pres. p. 192. Search this book on
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