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本文总结了在Ⅱ型超新星爆发过程中可能发生的中微子与物质相互作用,综述了Ⅱ型超新星爆发的各个阶段的中微子过程,介绍了有关的中微子输运理论和几种主要近似方案。 相似文献
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We theoretically investigate the additional correction to the Casimir effect due to the change of dielectric constant with temperature, which is different from the previous research that have widely taken dielectric constants of materials as a value independent of temperature. It is found that such a correction can go beyond 20% for some cases and it should not be ignored. Due to the prominent correction, it is possible to tune the Casimir force by such an effect. 相似文献
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Sommerfeld's Quantum Condition of Action and the Spectra of Quantum Schwarzschild Black Hole 下载免费PDF全文
If the situation of quantum gravity nowadays is nearly the same as that of quantum mechanics in its early time of Bohr and Sommerfeld, then a first-step study of the quantum gravity under Sommerfeld‘s quantum condition of action might be helpful. We present the spectra of quantum Schwarzschild black hole in non-relativistic quantum mechanics. It is found that the quantum of area is 8π/3 lp^2, the quantum of entropy is 2π/4kB, and the Hawking evaporation will cease when the black hole reaches the ground state m=1/2√3mp. 相似文献
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在经典电动力学的麦克斯韦方程组中,·D=σf,而·B=0。这意味着和电荷相应的磁荷(磁单极)不存在。因而,在经典的麦克斯韦电磁理论中,电和磁并不处在完全对称的地位。对此,人们不很满意。如果自然界有磁荷存在,那么只要假定所有粒子的磁荷一电荷比是同一常数,总能通过适当的数学变换使麦克斯韦方程组仍具有目前这种形式。 近代对磁单极的讨论始于1931年Dirac的一篇文章[1]。Dirac指出:如果自然界有磁荷存在,则任何粒子的电荷就必须是量子化的,即必须是电子电荷的整数倍。1974年,A,M.polyakov(苏联)和G.t’Hooft(芬兰)又指出:磁单极的质量… 相似文献
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