Gravitational particle creation in a stiff matter dominated universe
Gravitational particle creation in a stiff matter dominated universe
复制标题
刚性物质主导的宇宙中引力粒子的产生
DOI：
--
复制
发表时间：
2016
期刊：
影响因子：
--
通讯作者：
I. Vilja
中科院分区：
文献类型：
--
作者：
Juho Lankinen;I. Vilja
提出了一种在刚性物质控制的平坦Friedmann-Robertson-Walker宇宙中产生引力粒子的情景。用量子场论计算了弯曲时空中标量粒子的初始产生，发现它强烈地依赖于标量质量和宇宙的膨胀参数。粒子的创建对于质量非常大的标量场和较大的展开参数最为有效。我们通过将其应用于宇宙玩具模型场景来演示这一现象，在该场景中，次级粒子是由标量场衰变产生的。
A scenario for gravitational particle creation in a stiff matter dominated flat Friedmann-Robertson-Walker universe is presented. The primary creation of scalar particles is calculated using quantum field theory in curved spacetime and it is found to be strongly dependent on the scalar mass and the expansion parameter of the universe. The particle creation is most effective for a very massive scalar field and large expansion parameter. We demonstrate the phenomenon by applying it to cosmological toy model scenario, where secondary particles are created by the scalar field decay.