Asymptotically optimal Wasserstein couplings for the small-time stable domain of attraction
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arXiv
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| Hauptverfasser: | , , |
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| Format: | Preprint |
| Veröffentlicht: |
2024
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| author | Cázares, Jorge González Kramer-Bang, David Mijatović, Aleksandar |
| author_facet | Cázares, Jorge González Kramer-Bang, David Mijatović, Aleksandar |
| contents | We develop two novel couplings between general pure-jump Lévy processes in $\R^d$ and apply them to obtain upper bounds on the rate of convergence in an appropriate Wasserstein distance on the path space for a wide class of Lévy processes attracted to a multidimensional stable process in the small-time regime. We also establish general lower bounds based on certain universal properties of slowly varying functions and the relationship between the Wasserstein and Toscani--Fourier distances of the marginals. Our upper and lower bounds typically have matching rates. In particular, the rate of convergence is polynomial for the domain of normal attraction and slower than a slowly varying function for the domain of non-normal attraction. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_03609 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Asymptotically optimal Wasserstein couplings for the small-time stable domain of attraction Cázares, Jorge González Kramer-Bang, David Mijatović, Aleksandar Probability Statistics Theory Primary 60F05, 60G51, Secondary 60G52, 60F25 We develop two novel couplings between general pure-jump Lévy processes in $\R^d$ and apply them to obtain upper bounds on the rate of convergence in an appropriate Wasserstein distance on the path space for a wide class of Lévy processes attracted to a multidimensional stable process in the small-time regime. We also establish general lower bounds based on certain universal properties of slowly varying functions and the relationship between the Wasserstein and Toscani--Fourier distances of the marginals. Our upper and lower bounds typically have matching rates. In particular, the rate of convergence is polynomial for the domain of normal attraction and slower than a slowly varying function for the domain of non-normal attraction. |
| title | Asymptotically optimal Wasserstein couplings for the small-time stable domain of attraction |
| topic | Probability Statistics Theory Primary 60F05, 60G51, Secondary 60G52, 60F25 |
| url | https://arxiv.org/abs/2411.03609 |