Krylov Complexity in Free and Interacting Scalar Field Theories with Bounded Power Spectrum
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arXiv
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| Format: | Preprint |
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2022
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| author | Camargo, Hugo A. Jahnke, Viktor Kim, Keun-Young Nishida, Mitsuhiro |
| author_facet | Camargo, Hugo A. Jahnke, Viktor Kim, Keun-Young Nishida, Mitsuhiro |
| contents | We study a notion of operator growth known as Krylov complexity in free and interacting massive scalar quantum field theories in $d$-dimensions at finite temperature. We consider the effects of mass, one-loop self-energy due to perturbative interactions, and finite ultraviolet cutoffs in continuous momentum space. These deformations change the behavior of Lanczos coefficients and Krylov complexity and induce effects such as the "staggering" of the former into two families, a decrease in the exponential growth rate of the latter, and transitions in their asymptotic behavior. We also discuss the relation between the existence of a mass gap and the property of staggering, and the relation between our ultraviolet cutoffs in continuous theories and lattice theories. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2212_14702 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Krylov Complexity in Free and Interacting Scalar Field Theories with Bounded Power Spectrum Camargo, Hugo A. Jahnke, Viktor Kim, Keun-Young Nishida, Mitsuhiro High Energy Physics - Theory Statistical Mechanics Quantum Physics We study a notion of operator growth known as Krylov complexity in free and interacting massive scalar quantum field theories in $d$-dimensions at finite temperature. We consider the effects of mass, one-loop self-energy due to perturbative interactions, and finite ultraviolet cutoffs in continuous momentum space. These deformations change the behavior of Lanczos coefficients and Krylov complexity and induce effects such as the "staggering" of the former into two families, a decrease in the exponential growth rate of the latter, and transitions in their asymptotic behavior. We also discuss the relation between the existence of a mass gap and the property of staggering, and the relation between our ultraviolet cutoffs in continuous theories and lattice theories. |
| title | Krylov Complexity in Free and Interacting Scalar Field Theories with Bounded Power Spectrum |
| topic | High Energy Physics - Theory Statistical Mechanics Quantum Physics |
| url | https://arxiv.org/abs/2212.14702 |