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arXiv 2402.04460gr-qcastro-ph.COhep-th
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一种用于暴胀、暗物质、暗能量和黑洞的新型双场纯K-essence理论

A novel two-field pure K-essence for inflation, dark matter, dark energy and black holes

Changjun Gao

AI总结:

本文提出一种新型双场纯K-essence理论,其拉格朗日量仅依赖两个标量场的动能商,可统一描述暴胀、暗物质、暗能量,并简化黑洞解的求解。

摘要:

K-essence理论通常是在单标量场$\phi$的框架下研究的。即K-essence的拉格朗日量是标量场$\phi$及其协变导数的函数。然而,在本文中,我们探索了一种双场纯K-essence,即相应的拉格朗日量是两个标量场的协变导数的函数,而不依赖于标量场本身。这就是我们称之为纯K-essence的原因。这种K-essence的新颖之处在于其拉格朗日量包含来自两个标量场的动能商项。这导致了许多有趣特性的出现,例如,状态方程可以任意小也可以任意大。作为比较,quintessence的状态方程范围是从$-1$到$+1$。有趣的是,这种新颖的K-essence可以扮演暴胀场、暗物质和暗能量的角色。最后,运动方程中不存在标量场本身,这使得研究变得相当简单,甚至可以得到精确的黑洞解。

英文摘要:

K-essence theories are usually studied in the framework of one scalar field $ϕ$. Namely, the Lagrangian of K-essence is the function of scalar field $ϕ$ and its covariant derivative. However, in this paper, we explore a two-field pure K-essence, i.e. the corresponding Lagrangian is the function of covariant derivatives of two scalar fields without the dependency of scalar fields themselves. That is why we call it pure K-essence. The novelty of this K-essence is that its Lagrangian contains the quotient term of the kinetic energies from the two scalar fields. This results in the presence of many interesting features, for example, the equation of state can be arbitrarily small and arbitrarily large. As a comparison, the range for equation of state of quintessence is from $-1$ to $+1$. Interestingly, this novel K-essence can play the role of inflation field, dark matter and dark energy. Finally, the absence of the scalar fields themselves in the equations of motion makes the study considerable simple such that even the exact black hole solutions can be found.

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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