# American Institute of Mathematical Sciences

August  2018, 11(4): 715-734. doi: 10.3934/krm.2018029

## Long time strong convergence to Bose-Einstein distribution for low temperature

 Deartment of Mathematical Sciences, Tsinghua University, Beijing 100084, China

Received  August 2017 Revised  November 2017 Published  April 2018

Fund Project: This work was supported by National Natural Science Foundation of China Grant No.11571196.

We study the long time behavior of measure-valued isotropic solutions $F_t$ of the Boltzmann equation for Bose-Einstein particles for low temperature. The global in time existence of such solutions $F_t$ that converge at least semi-strongly to equilibrium (the Bose-Einstein distribution) has been proven in previous work and it has been known that the long time strong convergence to equilibrium is equivalent to the long time convergence to the Bose-Einstein condensation. Here we show that if such a solution $F_t$ as a family of Borel measures satisfies a uniform double-size condition (which is also necessary for the strong convergence), then $F_t$ converges strongly to equilibrium as $t$ tends to infinity. We also propose a new condition on the initial datum $F_0$ such that a corresponding solution $F_t$ converges strongly to equilibrium.

Citation: Xuguang Lu. Long time strong convergence to Bose-Einstein distribution for low temperature. Kinetic & Related Models, 2018, 11 (4) : 715-734. doi: 10.3934/krm.2018029
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