Rolling closed string tachyons and the big crunch
Rolling closed string tachyons and the big crunch
复制标题
滚动闭弦快子和大挤压
DOI：
10.1088/1126-6708/2005/08/046
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发表时间：
2005
影响因子：
5.4
通讯作者：
B. Zwiebach
中科院分区：
文献类型：
--
作者：
Haitang Yang;B. Zwiebach
研究玻色闭弦理论中耦合引力、玻色介子和体闭弦快子的低能有效场方程。我们建立，每当快子诱导滚动过程中，字符串度量保持固定，而快子滚动到强耦合。对于负定势，我们表明，这将导致爱因斯坦度规，在有限的时间内压缩宇宙。这种行为被证明是相当普遍的，即使潜在的不是负定的。的解决方案是让人想起那些在崩溃阶段的循环宇宙宇宙学中的标量场势与负能量发挥了核心作用。
We study the low-energy effective field equations that couple gravity, the dilaton, and the bulk closed string tachyon of bosonic closed string theory. We establish that whenever the tachyon induces the rolling process, the string metric remains fixed while the dilaton rolls to strong coupling. For negative definite potentials we show that this results in an Einstein metric that crunches the universe in finite time. This behavior is shown to be rather generic even if the potentials are not negative definite. The solutions are reminiscent of those in the collapse stage of a cyclic universe cosmology where scalar field potentials with negative energies play a central role.