報告題目：Orientifold Calabi-Yau threefolds: Constructions and Machine Learning

報告時間：2024年10月17日上午10點-11點

報告地點：kaiyun開云官方網(wǎng)站犀浦校區(qū)3教X30456

報告人：高昕研究員（四川大學(xué)）

摘要： Using the Kreuzer-Skarke database of 4-dimensional reflexive polytopes, we systematically constructed a new database of orientifold Calabi-Yau threefolds up to h^{1,1}(X) =12. Our approach involved a non-trivial Z_2 involution, with both divisor exchanging and multi-reflections, acting on the Calabi-Yau manifolds. Each of such proper involutions will result in an orientifold Calabi-Yau manifolds and 320,386,067 of them was constructed. We developed a novel algorithm that significantly reduces the complexity of determining the fixed locus under the involutions, followed by the locations of different types of O-planes. It shows that under the proper involutions one end up with majority the O3/O7-planes system and most of them will further admit a naive Type IIB string vacua. Additionally, a new type of free action was determined. We also computed the smoothness and the splitting of Hodge numbers for these orientifold Calabi-Yau threefolds. Finally, We use the machine learning technique to search the polytope which can result in an orientifold Calabi-Yau hypersurface and the“naive type IIB string vacua”.

報告人簡介：2008年本科畢業(yè)于北京師范大學(xué)，2014年于中國科學(xué)院理論物理研究所獲得博士學(xué)位，期間在德國馬克斯-普朗克物理研究所博士聯(lián)合培養(yǎng)。此后分別在美國弗吉尼亞理工大學(xué)，意大利INFN/羅馬第二大學(xué)，德國海德堡大學(xué)從事博士后科學(xué)研究工作。曾獲意大利國家核物理研究所理論物理博士后研究獎金，德國洪堡學(xué)者研究獎金?，F(xiàn)在四川大學(xué)物理學(xué)院任教，研究方向為弦論唯象，計算代數(shù)幾何，全息有效場論等。