标题： 标量子在微扰量子引力中的衰变 显示英文标题

标题： Scalaron Decay in Perturbative Quantum Gravity

摘要： 某种二次引力模型提供了一个成功的暴胀场景。 暴胀由一种称为标量子的新标量自由度驱动。 暴胀结束后，标量子衰变为物质和暗物质自由度，重新加热宇宙。 我们研究了标量子将能量传递给物质领域的新的途径。 这些途径是通过中间引力子态的湮灭和衰变。 结果是在微扰量子引力框架下获得的。 在重标量子极限下，只有标量粒子通过湮灭途径产生。 标量子衰变为所有类型的粒子都是允许的。 在轻标量子极限下，衰变途径被强烈抑制。 在再加热的早期阶段，通过湮灭途径产生的玻色子预计占主导地位，而费米子的产生将在后期阶段占主导地位。 显示英文摘要

摘要： A certain quadratic gravity model provides a successfully inflationary scenario. The inflation is driven by the new scalar degree of freedom called scalaron. After the end of inflation the scalaron decays in matter and dark matter degrees of freedom reheating the Universe. We study new channels by which the scalaron can transfer energy to the matter sector. These channels are annihilation and decay via intermediate graviton states. Results are obtained within perturbative quantum gravity. In the heavy scalaron limit only scalar particles are produced by the annihilation channel. Scalaron decays in all types of particles are allowed. In the light scalaron limit decay channel is strongly suppressed. Boson production via the annihilation channel is expected to be dominant at the early stages of reheating, while fermion production will dominate later stages.