arXiv 1809.035722018-09hep-thgr-qchep-ph

量子无标度区与弦模

Quantum no-scale regimes and string moduli

Herve Partouche

备注：: 1+17 pages, 3 figures

摘要：

在微扰弦论中，在量子水平上的无标度模型中发现的平坦的、均匀的和各向同性的宇宙学演化可以进入“量子无标度区”（QNSRs）。在这种情况下，量子有效势主要由无标度模、介子和不涉及超对称破缺的模的经典动能决定。其结果是，演化接近经典的，其中的无标度结构是准确的。当单圈势为正时，全局吸引子机制迫使初始膨胀的解进入描述平坦的、不断膨胀的宇宙的QNSR。相反，当势可以达到负值时，内部模量在大多数情况下会导致生长宇宙的某种不稳定性。后者停止膨胀并最终坍缩，除非初始条件在相空间的一个很小的区域中被调整。最后，在QNSR中，无论势的细节如何，都不会发生规范不稳定性。

英文摘要：

We review that in perturbative string theory, flat, homogeneous and isotropic cosmological evolutions found in no-scale models at the quantum level can enter into "quantum no-scale regimes" (QNSRs). When this is the case, the quantum effective potential is dominated by the classical kinetic energies of the no-scale modulus, dilaton and moduli not involved in the supersymmetry breaking. As a result, the evolutions approach the classical ones, where the no-scale structure is exact. When the 1-loop potential is positive, a global attractor mechanism forces the initially expanding solutions to enter the QNSR describing a flat, ever-expanding universe. On the contrary, when the potential can reach negative values, the internal moduli induce in most cases some kind of instability of the growing universe. The latter stops expanding and eventually collapses, unless the initial conditions are tuned in a tiny region of the phase space. Finally, in QNSR, no gauge instability takes place, regardless of the details of the potential.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

摘要：

英文摘要：

相关论文