标题： 具有粒子生成的涌现宇宙 显示英文标题

标题： Emergent Universe with particle production

摘要： 展示了一种可能的宇宙涌现解，该解允许通过牺牲引力场来不可逆地创造物质，从而满足爱因斯坦场方程。 当选择宇宙为时空平坦的FRW时空，并采用[17]中提出的状态方程时，当现象学物质生成率与数密度乘以哈勃参数的比值是一个时间无关的单位数量级的$\beta$时，该解存在。 这种解的热力学行为也得到了确定。 有趣的是，我们还发现，当选择物质生成率为常数时，在宇宙学中通常的状态方程下也存在宇宙涌现情景。 还讨论了更一般的宇宙涌现解类。 显示英文摘要

摘要： The possibility of an emergent universe solution to Einstein's field equations allowing for an irreversible creation of matter at the expense of the gravitational field is shown. With the universe being chosen as spatially flat FRW spacetime together with equation of state proposed in [17], the solution exists when the ratio of the phenomenological matter creation rate to the number density times the Hubble parameter is a number $\beta$ of the order of unity and independent of time. The thermodynamic behaviour is also determined for this solution. Interestingly, we also find that an emergent universe scenario is present with usual equation of state in cosmology when the matter creation rate is chosen to be a constant. More general class of emergent universe solutions are also discussed.