标题： 宇宙加速来自弦诱导的加利略子 显示英文标题

标题： Cosmic acceleration from string induced Galileons

摘要： 人们已经证明，特定的Horndeski引力理论源于低能有效异弦作用的gravidilaton部分的一致Kaluza-Klein约化，其中包含了第一个$\alpha'$修正。 在这里，我们通过对各种框架下的场方程构造精确解，首次研究了该低维理论的宇宙学解。 在树级情况下，在弦帧中，我们发现母理论的对偶对称性并未因维度约化而改变，导致标准反弹和大爆炸前情景解。 对于$\alpha'\neq0$，我们发现了精确模型表现出宇宙加速，其中我们发现了关于非紧致维度数量的有趣物理现象。 某些稳定性要求需要包含一个标量势。 显示英文摘要

摘要： It has been shown a specific Horndeski theory of gravity arises from a consistent Kaluza-Klein reduction of the gravi-dilaton sector of the low-energy effective heterotic string action with a first $\alpha'$ correction. Here we provide a first investigation of the cosmological solutions to the lower dimensional theory by constructing exact solutions to the field equations in various frames. At tree level, in string frame, we find the duality symmetry of the parent theory is unaltered by dimensional reduction, leading to standard bouncing and pre-Big Bang scenario solutions. For $\alpha'\neq0$, we uncover exact models exhibiting cosmic acceleration, where we find interesting physics concerning the number of noncompact dimensions. Certain stability requirements demand the inclusion of a dilaton potential.