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EnglishWe obtain the induced Lorentz- and CPT-violating term in QED at finite temperature using the imaginary-time formalism and dimensional regularization. Its form resembles a Chern-Simons-like structure, but, unexpectedly, it does not depend on the temporal component of the fixed bμ constant vector that is coupled to the axial-vector current. Nevertheless, Ward identities are respected and its coefficient vanishes at T=0, consistent with previous computations with the same regularization procedure, and it is a nontrivial function of temperature. We argue that at finite T a Chern-Simons-like Lorentz- and CPT-violating term is generically present, the value of its coefficient being unambiguously determined up to a T-independent constant, related to the zero-temperature renormalization conditions.
The Structure of Radiatively Induced Lorentz and CPT Violation in Qed at Finite Temperature / D. Seminara; L. Griguolo; L. Cervi. - ELETTRONICO. - 64(2001), pp. 105003-1-105003-6.
| Titolo: | The Structure of Radiatively Induced Lorentz and CPT Violation in Qed at Finite Temperature |
| Autori di Ateneo: | |
| Autori: | SEMINARA, DOMENICO; L. Griguolo; L. Cervi |
| Data di pubblicazione: | 2001 |
| Rivista: | |
| Volume: | 64 |
| Pagina iniziale: | 105003-1 |
| Pagina finale: | 105003-6 |
| Abstract: | We obtain the induced Lorentz- and CPT-violating term in QED at finite temperature using the imaginary-time formalism and dimensional regularization. Its form resembles a Chern-Simons-like structure, but, unexpectedly, it does not depend on the temporal component of the fixed bμ constant vector that is coupled to the axial-vector current. Nevertheless, Ward identities are respected and its coefficient vanishes at T=0, consistent with previous computations with the same regularization procedure, and it is a nontrivial function of temperature. We argue that at finite T a Chern-Simons-like Lorentz- and CPT-violating term is generically present, the value of its coefficient being unambiguously determined up to a T-independent constant, related to the zero-temperature renormalization conditions. |
| Handle: | http://hdl.handle.net/2158/12606 |
| Appare nelle tipologie: | 1a - Articolo su rivista |
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http://hdl.handle.net/2158/12606
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