Langevin Simulations with Colored Noise and Non-Markovian Dissipation
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| Format: | Artículo científico |
| Language: | en |
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Sociedade Brasileira de Física
2008
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| _version_ | 1876455253769977856 |
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| author | R. L. S. Farias |
| author_facet | R. L. S. Farias |
| contents | Langevin Simulations with Colored Noise and Non-Markovian Dissipation R. L. S. Farias R. O. Ramos L. A. da Silva Física, Astronomía y Matemáticas Non Markovian Colored noise Langevin equation The nonequilibrium dynamics of an homogeneous scalar field is studied using Langevin equations. Microscopic derivations based on quantum field theory methods can lead to complicated nonlocal equations of motion. Here we study, numerically, the results obtained by appropriately approximating these equations in a local form (the Markovian approximation) and compare with results obtained with suitable prescriptions for accounting for the nonlocal terms, i.e. the non-Markovian form. We use a prescription for the nonlocal equations motivated by the results obtained from previous derivations using nonequilibrium quantum field theory methods. 2008 artículo científico 0103-9733 https://www.redalyc.org/articulo.oa?id=46415795021 en http://www.redalyc.org/revista.oa?id=464 Brazilian Journal of Physics application/pdf Sociedade Brasileira de Física Brazilian Journal of Physics (Brasil) Num.3B Vol.38 |
| format | Artículo científico |
| id | redalyc_46415795021 |
| institution | Redalyc |
| language | en |
| publishDate | 2008 |
| publisher | Sociedade Brasileira de Física |
| spellingShingle | Langevin Simulations with Colored Noise and Non-Markovian Dissipation R. L. S. Farias Física, Astronomía y Matemáticas Non Markovian Colored noise Langevin equation Langevin Simulations with Colored Noise and Non-Markovian Dissipation R. L. S. Farias R. O. Ramos L. A. da Silva Física, Astronomía y Matemáticas Non Markovian Colored noise Langevin equation The nonequilibrium dynamics of an homogeneous scalar field is studied using Langevin equations. Microscopic derivations based on quantum field theory methods can lead to complicated nonlocal equations of motion. Here we study, numerically, the results obtained by appropriately approximating these equations in a local form (the Markovian approximation) and compare with results obtained with suitable prescriptions for accounting for the nonlocal terms, i.e. the non-Markovian form. We use a prescription for the nonlocal equations motivated by the results obtained from previous derivations using nonequilibrium quantum field theory methods. 2008 artículo científico 0103-9733 https://www.redalyc.org/articulo.oa?id=46415795021 en http://www.redalyc.org/revista.oa?id=464 Brazilian Journal of Physics application/pdf Sociedade Brasileira de Física Brazilian Journal of Physics (Brasil) Num.3B Vol.38 |
| title | Langevin Simulations with Colored Noise and Non-Markovian Dissipation |
| topic | Física, Astronomía y Matemáticas Non Markovian Colored noise Langevin equation |
| url | https://www.redalyc.org/articulo.oa?id=46415795021 |