Díaz Díaz, Jesús Ildefonso and Casal, Alfonso C. and Vegas Montaner, José Manuel
(2009)
*Blow-up in some ordinary and partial differential equations with time-delay.*
Dynamic Systems and Applications, 18
(1).
pp. 29-46.
ISSN 1056-2176

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Official URL: http://www.dynamicpublishers.com/DSA/dsa18pdf/03-DSA-CY-3-Casal.pdf

## Abstract

Blow-up phenomena are analyzed for both the delay-differential equation (DDE) u'(t) = B'(t)u(t - tau), and the associated parabolic PDE (PDDE) partial derivative(t)u=Delta u+B'(t)u(t-tau,x), where B : [0, tau] -> R is a positive L(1) function which behaves like 1/vertical bar t - t*vertical bar(alpha), for some alpha is an element of (0, 1) and t* is an element of (0,tau). Here B' represents its distributional derivative. For initial functions satisfying u(t* - tau) > 0, blow up takes place as t NE arrow t* and the behavior of the solution near t* is given by u(t) similar or equal to B(t)u(t - tau), and a similar result holds for the PDDE. The extension to some nonlinear equations is also studied: we use the Alekseev's formula (case of nonlinear (DDE)) and comparison arguments (case of nonlinear (PDDE)). The existence of solutions in some generalized sense, beyond t = t* is also addressed. This results is connected with a similar question raised by A. Friedman and J. B. McLeod in 1985 for the case of semilinear parabolic equations.

Item Type: | Article |
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Uncontrolled Keywords: | ordinary and partial delay differential equations; parabolic partial differential equations; blow-up; Alekseev's formula. |

Subjects: | Sciences > Mathematics > Differential equations |

ID Code: | 15136 |

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Deposited On: | 08 May 2012 10:00 |

Last Modified: | 06 Feb 2014 10:17 |

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