| Project/Area Number |
16540155
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Basic analysis
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| Research Institution | OKAYAMA UNIVERSITY |
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Principal Investigator |
HIROKAWA Masao Okayama Univ., Grad.Sch.Nat.& Tech., Professor, 大学院・自然科学研究科, 教授 (70282788)
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| Co-Investigator(Kenkyū-buntansha) |
HIROSHIMA Fumio Kyushu Univ., Fac.Math., Associate Professor, 大学院・数理学研究院, 助教授 (00330358)
TAMURA Hideo Okayama Univ., Grad.Sch.Nat.& Tech., Professor, 大学院・自然科学研究科, 教授 (30022734)
SATO Ryotaro Okayama Univ., Grad.Sch.Nat.& Tech., Professor, 大学院・自然科学研究科, 教授 (50077913)
TANAKA Katsumi Okayama Univ., Admission center, Associate Professor, アドミッションセンター, 助教授 (60207082)
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| Project Period (FY) |
2004 – 2005
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| Project Status |
Completed (Fiscal Year 2005)
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| Budget Amount *help |
¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 2005: ¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 2004: ¥1,900,000 (Direct Cost: ¥1,900,000)
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| Keywords | Nonrelativistic QED / Operator Analysis / Ultraviolet Cutoff |
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| Research Abstract |
There are some mathematical problems in nonrelativistic quantum electrodynamics. Especially, we have been concerned with ultraviolet catastrophe in high energy region and moreover infrared catastrophe after removing ultraviolet cutoff.
Hirokawa established some problems on ultraviolet catastrophe and/or infrared castastrophe in mathematics. Hiroshima and Spohn investigated the renormalized mass of electron. Hirokawa, Hiroshima, and Spohn have succeeded in removing both, ultraviolet and infrared cutoffs for the so-called Nelson model, which describes the electron coupled with photons in such as hydrogen-like atom. Also, Hirokawa clarified that the result by the regular perturbation theory is still available in the above model after removing both cutoffs in collaboration with Hainzl and Spohn. They employed a nonperturbative method to prove it.
Hirokawa studied scattering theory with Tamura, problem on singularity of ultraviolet catastrophe with Tanaka, and uniqueness of the ground state with Sato.
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