Neupane Ishwaree P
Department of Physics and Astronomy, University of Canterbury, Private Bag 4800, Christchurch 8020, New Zealand.
Phys Rev Lett. 2007 Feb 9;98(6):061301. doi: 10.1103/PhysRevLett.98.061301. Epub 2007 Feb 7.
We find a cosmological solution corresponding to the compactification of 10D supergravity on a warped conifold that easily circumvents the "no-go" theorem given for a warped or flux compactification, providing new perspectives for the study of supergravity or superstring theory in cosmological backgrounds. With fixed volume moduli of the internal space, the model can explain a physical Universe undergoing an accelerated expansion in the 4D Einstein frame, for a sufficiently long time. The solution found in the limit that the warp factor dependent on the radial coordinate y is extremized (giving a constant warping) is smooth and it supports a flat four-dimensional Friedmann-Robertson-Walker cosmology undergoing a period of accelerated expansion with slowly rolling or stabilized volume moduli.
我们找到了一个与在弯曲锥形流形上进行十维超引力紧致化相对应的宇宙学解，该解轻松规避了针对弯曲或通量紧致化给出的“不可行”定理，为在宇宙学背景下研究超引力或超弦理论提供了新视角。对于内部空间具有固定体积模量的情况，该模型能够解释在四维爱因斯坦框架下一个物理宇宙经历足够长时间加速膨胀的现象。在依赖于径向坐标y的翘曲因子取极值（即给出恒定翘曲）的极限情况下找到的解是平滑的，并且它支持一个平坦的四维弗里德曼 - 罗伯逊 - 沃克宇宙学，该宇宙学经历一个具有缓慢滚动或稳定体积模量的加速膨胀时期。
