Formation of primordial black holes after inflation in modified gravity and supergravity

在2022财年项目的第一年，我们的研究活动集中在通过建立和研究我们在引力理论和超引力理论中的原始模型来研究膨胀过程中原始黑洞(PBH)的形成。我们所有的新模型都与最近对宇宙微波背景(CMB)辐射的测量结果一致，并预测了小行星大小的PBH的形成。与韩国、泰国、中国、德国和俄罗斯的其他研究人员合作，在计算机上对大标量(曲率)扰动的功率谱进行了数值计算。利用修正的引力理论，我们在宇宙单场和多场膨胀的新的可行模型的研究中取得了重大进展，这些模型在导致PBH形成的标量微扰的功率谱中有一个大的峰值。在超重力中，我们通过添加膨胀后自发的超对称破缺机制对我们的模型进行了扩展，这对重新加热很重要。我们的新成果发表在8篇原创研究论文中，发表在排名靠前的(Web of Science Rating中的Q1和Q2)同行评议的国际物理期刊上，并由首席研究员在2022年9月在希腊举行的主要国际高能粒子物理会议上提交。

During the first year FY2022 of the project our research activities were focused on theoretical investigation of formation of primordial black holes (PBH) during inflation by constructing and investigating our original models in gravitational theory and supergravity theory. All our new models were consistent with recent measurements of the Cosmic Microwave Background (CMB) radiation, and predicted the formation of PBH of the asteroid size. Numerical calculations of the power spectrum of large scalar (curvature) perturbations were performed on computers in collaboration with other researchers in South Korea, Thailand, China, Germany and Russia. We achieved significant progress in our studies of new viable models of cosmological single-field and multi-field inflation, which have a large peak in the power spectrum of scalar perturbations leading to the PBH formation, by using the modified gravity theories. In supergravity, we extended our models by adding a mechanism of spontaneous supersymmetry breaking after inflation, which is important for reheating. Our new results were published in 8 original research papers in the high-ranked (Q1 and Q2 in the Web of Science rating) peer-reviewed international journals of physics, and presented by the Principal Investigator at the major international conference on high-energy particle physics, held in Greece in September 2022.