On the spectrum of particles created in a Robertson-Walker universe
On the spectrum of particles created in a Robertson-Walker universe
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关于罗伯逊-沃克宇宙中产生的粒子光谱
DOI：
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发表时间：
1983
期刊：
影响因子：
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通讯作者：
T. Azuma
中科院分区：
文献类型：
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作者：
T. Azuma
创建的粒子谱在 Robertson-Walker 宇宙中以尺度因子 a∝tα(0 <α≤ 1) 和 a∝et 进行计算，并特别强调它们对施加类似 WKB 正频率条件的初始和最终时间的依赖性。结果表明，如果场方程的 WKB 近似在其邻域内无效，则获得的光谱对这些时间非常敏感。还表明，如果最终时间设置为有限，则创建的粒子的总数密度仍然是有限的。
Created particle spectra are calculated in Robertson-Walker universes with scale factora∝tα(0 <α≦ 1) anda∝et, and discussed with a special emphasis on their dependence upon the initial and final times at which a WKB-like positive frequency condition should be imposed. It is shown that the obtained spectra are very sensitive to these times if the WKB approximation for the field equation is not valid in their neighborhood. It is also shown that the total number density of created particles remains finite if the final time is set to be finite.