| Autor: |
Shunsuke, Yabunaka, Bertrand, Delamotte |
| Rok vydání: |
2018 |
| Zdroj: |
Physical review letters. 121(23) |
| ISSN: |
1079-7114 |
| Popis: |
The large N expansion plays a fundamental role in quantum and statistical field theory. We show on the example of the O(N) model that at N=∞ its standard implementation misses some fixed points of the renormalization group in all dimensions smaller than four. These new fixed points show singularities under the form of cusps at N=∞ in their effective potential that become a boundary layer at finite N. We show that they have a physical impact on the multicritical physics of the O(N) model at finite N. We also show that the mechanism at play holds also for the O(N)⊗O(2) model and is thus probably generic. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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