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dynamical effects of switching a super-critical well potential on pair creation from a vacuum

Chinese Physics B 2018年第8期27卷 103-108页

作者： Qiang Wang Qin-Zhi Xia Jie Liu Li-Bin Fu Institute of Applied Physics and Computational Mathematics Beijing 100088China Graduate School China Academy of Engineering PhysicsBeijing 100088China CAPT HEDPSand IFSA Collaborative Innovation Center of the Ministry of EducationPeking UniversityBeijing 100871China

The dynamical effects on electron-positron pair creation from a vacuum caused by the switching processes of a super- critical well potential are investigated in detail. The results show that only when the switching on and switching off time both increase will the final pair yield converge to the integer of embedded bound states nearly exponentially. But a single adiabatic switching on or switching off cannot lead to an integer pair yield. If the potential is turned on abruptly, associated with the discrete and embedded bound states, there is multi-frequency oscillation around the pair number＇s saturation. The slowly switching on can suppress the amplitude of this oscillation and reduce the final pair yield. The switching off can also reduce the final pair number in the same order of magnitude. The evolution of a single-pair number shows a robust long range correlation between particle and antiparticle. For an adiabatic switching case, the single-pair dominates the early pair creation, their upper limit value is equal to the integer, and these single-pairs will totally disentangle during the switching off.

关键词： electron-positron pair creation dynamical effect

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effect of nonlinear advection on the Indian Ocean diploe asymmetry

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Acta Oceanologica Sinica 2014年第1期33卷 77-82页

作者： WANG Yu LAN Jian CUI Fengjuan Key Laboratory of Physical Oceanography Ocean University of China Department of Oceanography Ocean University of China

The asymmetry of sea surface temperature anomaly（SSTA） amplitudes between the positive and negative phases of the Indian Ocean dipole（IOD） are *** dynamic effects on it are analyzed using a hybrid coordinate ocean model（HYCOM）.It suggests that the IOD is still asymmetric even when forced by a symmetric wind stress,and the asymmetry of the SSTA in the eastern pole is strong while that in the western pole is almost insignificant during the mature phase（September–November（SON））.Thus,the IOD asymmetry is primarily caused by the asymmetry in the IODE.A heat budget analysis is also conducted for the mixedlayer temperature in the eastern Indian Ocean（IODE）,which indicates that a nonlinear ocean advection cools both the positive and negative IOD ***,the nonlinear ocean advection is responsible for the asymmetry of the IOD.

关键词： asymmetry of Indian Ocean dipole dynamical effect heat budget nonlinear advection

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