Abstract
We prove the \(L_{p,q}\)-solvability of parabolic equations in divergence form with full lower-order terms. The coefficients and non-homogeneous terms belong to mixed Lebesgue spaces with the lowest integrability conditions. In particular, the coefficients for the lower-order terms are not necessarily bounded. We study both the Dirichlet and conormal derivative boundary value problems on irregular domains. We also prove embedding results for parabolic Sobolev spaces, the proof of which is of independent interest.
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Acknowledgements
The authors would like to thank Hongjie Dong for helpful suggestions and discussion including the full ranges of \((p_k,q_k)\) in Theorem 5.2 and an example supporting the assertion in Remark 2.3. The authors also thank Jongkeun Choi for discussion on an early version of the paper and the referee for his/her careful review and helpful comments.
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D. Kim and K. Woo were supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (2019R1A2C1084683).
S. Ryu was supported by NRF-2017R1C1B1010966 and NRF-2020R1C1C1A01014310.
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Kim, D., Ryu, S. & Woo, K. Parabolic equations with unbounded lower-order coefficients in Sobolev spaces with mixed norms. J. Evol. Equ. 22, 9 (2022). https://doi.org/10.1007/s00028-022-00761-2
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DOI: https://doi.org/10.1007/s00028-022-00761-2
Keywords
- Parabolic equations
- Unbounded lower-order coefficients
- Sobolev spaces
- Embedding theorem
- Reifenberg flat domains