EU2C - Quantum Fields |
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Speaker |
Tada, Yuichiro |
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Coauthors |
Fujita, Tomohiro; Pinol, Lucas; Renaux-Petel, Sebastien; Tokuda, Junsei |
| Talk Title |
Stochastic inflation in a general field space |
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Abstract |
Inflationary models in non-trivial field spaces encoded by their non-canonical kinetic terms have attracted attentions recently. On the other hand, the so-called stochastic formalism is known as a powerful tool to investigate a quantum diffusion effect on inflation. In this formalism, field fluctuations originating from the quantum zero-point oscillation are mimicked by classical random noise. We consistently formulate this prescription in a curved field space with use of the path integral method including metric perturbations. We also point out that this formalism has an inevitable ambiguity related with the arbitrariness of noise integral represented by the Ito or Stratonovich process. The smallness of this ambiguity is suggested to be a novel criterion of the validity of the application of this formalism. |
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