Time-dependent singularities in the heat equation

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May 2015, 14(3): 969-979. doi: 10.3934/cpaa.2015.14.969

Time-dependent singularities in the heat equation

Jin Takahashi ^1, and Eiji Yanagida ^2,

1.	Department of Mathematics, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo 152-8551, Japan
2.	Department of Mathematics, Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8551

Received September 2014 Revised February 2015 Published March 2015

Abstract
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We consider solutions of the heat equation with time-dependent singularities. It is shown that a singularity is removable if it is weaker than the order of the fundamental solution of the Laplace equation. Some examples of non-removable singularities are also given, which show the optimality of the condition for removability.

Keywords: H\"older continuity., asymptotic behavior, removable singularity, Heat equation, time-dependent singularity.

Mathematics Subject Classification: Primary: 35K05; Secondary: 35A20, 35B4.

Citation: Jin Takahashi, Eiji Yanagida. Time-dependent singularities in the heat equation. Communications on Pure and Applied Analysis, 2015, 14 (3) : 969-979. doi: 10.3934/cpaa.2015.14.969

References:

[1]	H. Brézis and L. Véron, Removable singularities for some nonlinear elliptic equations, Arch. Rational Mech. Anal., 75 (1980/81), 1-6. doi: 10.1007/BF00284616.
[2]	B. Gidas and J. Spruck, Global and local behavior of positive solutions of nonlinear elliptic equations, Comm. Pure Appl. Math., 34 (1981), 525-598. doi: 10.1002/cpa.3160340406.
[3]	A. Grigor'yan, Heat Kernel and Analysis on Manifolds, American Mathematical Society, Providence, RI, 2009.
[4]	K. Hirata, Removable singularities of semilinear parabolic equations, Proc. Amer. Math. Soc., 142 (2014), 157-171. doi: 10.1090/S0002-9939-2013-11739-9.
[5]	S.-Y. Hsu, Removable singularities of semilinear parabolic equations, Adv. Differential Equations, 15 (2010), 137-158.
[6]	K. M. Hui, Another proof for the removable singularities of the heat equation, Proc. Amer. Math. Soc., 138 (2010), 2397-2402. doi: 10.1090/S0002-9939-10-10352-9.
[7]	T. Kan and J. Takahashi, On the profile of solutions with time-dependent singularities for the heat equation, Kodai Math. J., 37 (2014), 568-585. doi: 10.2996/kmj/1414674609.
[8]	P.-L. Lions, Isolated singularities in semilinear problems, J. Differential Equations, 38 (1980), 441-450. doi: 10.1016/0022-0396(80)90018-2.
[9]	S. Sato and E. Yanagida, Solutions with moving singularities for a semilinear parabolic equation, J. Differential Equations, 246 (2009), 724-748. doi: 10.1016/j.jde.2008.09.004.
[10]	L. Véron, Singular solutions of some nonlinear elliptic equations, Nonlinear Anal., 5 (1981), 225-242. doi: 10.1016/0362-546X(81)90028-6.
[11]	L. Véron, Singularities of Solutions of Second Order Quasilinear Equations, Longman, Harlow, 1996.

show all references

References:

[1]	H. Brézis and L. Véron, Removable singularities for some nonlinear elliptic equations, Arch. Rational Mech. Anal., 75 (1980/81), 1-6. doi: 10.1007/BF00284616.
[2]	B. Gidas and J. Spruck, Global and local behavior of positive solutions of nonlinear elliptic equations, Comm. Pure Appl. Math., 34 (1981), 525-598. doi: 10.1002/cpa.3160340406.
[3]	A. Grigor'yan, Heat Kernel and Analysis on Manifolds, American Mathematical Society, Providence, RI, 2009.
[4]	K. Hirata, Removable singularities of semilinear parabolic equations, Proc. Amer. Math. Soc., 142 (2014), 157-171. doi: 10.1090/S0002-9939-2013-11739-9.
[5]	S.-Y. Hsu, Removable singularities of semilinear parabolic equations, Adv. Differential Equations, 15 (2010), 137-158.
[6]	K. M. Hui, Another proof for the removable singularities of the heat equation, Proc. Amer. Math. Soc., 138 (2010), 2397-2402. doi: 10.1090/S0002-9939-10-10352-9.
[7]	T. Kan and J. Takahashi, On the profile of solutions with time-dependent singularities for the heat equation, Kodai Math. J., 37 (2014), 568-585. doi: 10.2996/kmj/1414674609.
[8]	P.-L. Lions, Isolated singularities in semilinear problems, J. Differential Equations, 38 (1980), 441-450. doi: 10.1016/0022-0396(80)90018-2.
[9]	S. Sato and E. Yanagida, Solutions with moving singularities for a semilinear parabolic equation, J. Differential Equations, 246 (2009), 724-748. doi: 10.1016/j.jde.2008.09.004.
[10]	L. Véron, Singular solutions of some nonlinear elliptic equations, Nonlinear Anal., 5 (1981), 225-242. doi: 10.1016/0362-546X(81)90028-6.
[11]	L. Véron, Singularities of Solutions of Second Order Quasilinear Equations, Longman, Harlow, 1996.

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