Thermal radiation produced by the expansion of the Universe
Thermal radiation produced by the expansion of the Universe
复制标题
宇宙膨胀产生的热辐射
作者：
L. Parker
我在这里展示了宇宙的膨胀可以创造出具有黑体分布的粒子。我给出了一个简单的模型，在这个模型中，在最初空的时空中产生的粒子在很早的时候就导致了弗里德曼膨胀，这种膨胀由具有黑体光谱的热相对论粒子（可能包括引力子）主导，甚至在经典的热化过程有机会采取行动之前。如果粒子的产生发生在普朗克时间附近，那么产生的熵在数量级上与爱因斯坦方程所要求的一致。文中还讨论了与观测到的3K黑体辐射一致的条件。
I show here that the expansion of the Universe can create particles with a black-body distribution. I give a simple model in which the creation of particles in an initially empty space time leads at very early times to a Friedmann expansion dominated by hot relativistic particles (probably including gravitons) having a black-body spectrum, even before classical thermalising processes have had a chance to act. If the particle creation occurs near the Planck time, the entropy produced is consistent, in order of magnitude, with that required by the Einstein equations. The conditions in which one achieves consistency with the observed 3K black-body radiation are also discussed.