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EnglishUsing very precise measurements of the critical couplings for the chiral transition of non-compact QED_4 in 10^4, 12^4 and 14^4 lattices we analyse the behaviour of the order parameter at the critical point using the equation of state of a logarithmically improved scalar mean field theory, that of the Nambu-Jona Lasinio theory and a pure power law. The first case is definitively excluded by the numerical data. Contrary to that, very high quality fits can be found for the other two cases. A more complex analysis including the susceptibility is however able to clearly distinguish between the last two possibilities. Triviality a la Nambu-Jona Lasinio is also ruled out.
| Titolo: | Testing logarithmic violations to scaling in strongly coupled QED |
| Autori: | |
| Data di pubblicazione: | 1996 |
| Rivista: | |
| Abstract: | Using very precise measurements of the critical couplings for the chiral transition of non-compact QED_4 in 10^4, 12^4 and 14^4 lattices we analyse the behaviour of the order parameter at the critical point using the equation of state of a logarithmically improved scalar mean field theory, that of the Nambu-Jona Lasinio theory and a pure power law. The first case is definitively excluded by the numerical data. Contrary to that, very high quality fits can be found for the other two cases. A more complex analysis including the susceptibility is however able to clearly distinguish between the last two possibilities. Triviality a la Nambu-Jona Lasinio is also ruled out. |
| Handle: | http://hdl.handle.net/11697/11180 |
| Appare nelle tipologie: | 1.1 Articolo in rivista |
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