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arXiv 0901.4930hep-thastro-ph.COgr-qc
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负宇宙学常数的暴胀

Inflation with a Negative Cosmological Constant

Tirthabir Biswas, Anupam Mazumdar

摘要:

我们发现了一种独特的方式来实现通货膨胀通过循环阶段在宇宙中的负真空能量。根据热力学第二定律,熵从一个循环到另一个循环单调增加,通常以恒定的因子增加。这意味着在连续循环中在相同能量密度下的比例因子也增加恒定因子。如果振荡的时间周期保持近似恒定,则这导致标度因子的“总体”指数增长,模仿通货膨胀。从暴胀阶段优雅地退出是可能的,因为在最后的收缩阶段,动态标量场可以把我们从负能量真空带到正能量真空。

英文摘要:

We find a unique way of realizing inflation through cyclic phases in an universe with negative vacuum energy. According to the second law of thermodynamics entropy monotonically increases from cycle to cycle, typically by a constant factor. This means that the scale factor at the same energy density in consecutive cycles also increases by a constant factor. If the time period of the oscillations remain approximately constant then this leads to an ``over all'' exponential growth of the scale factor, mimicking inflation. A graceful exit from this inflationary phase is possible as a dynamical scalar field can take us from the negative to a positive energy vacuum during the last contracting phase.

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。

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