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arXiv 1208.2146gr-qchep-th
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Eddington启发的Born-Infeld引力中理想流体驱动的宇宙

Universe Driven by Perfect Fluid in Eddington-inspired Born-Infeld Gravity

Inyong Cho, Hyeong-Chan Kim, Taeyoon Moon

摘要:

我们研究了充满正压理想流体的宇宙在Eddington启发的Born-Infeld引力中的演化。我们考虑各向同性和各向异性的宇宙。在高能量密度的早期阶段,演化过程与广义相对论相比有了较大的改进。对于状态方程参数$w>0$,初始奇异性并不伴随,因为它是在早期的工作中发现的辐射。更有趣的是,对于无压粉尘($w=0$),初始状态接近德西特状态。这一事实为理论的无奇点性质开辟了新的可能性。与广义相对论相反,各向异性是温和的,并且不会在时空中产生曲率奇点。

英文摘要:

We investigate the evolution of the Universe filled with barotropic perfect fluid in Eddington-inspired Born-Infeld gravity. We consider both the isotropic and the anisotropic universe. At the early stage when the energy density is high, the evolution is modified considerably compared with that in general relativity. For the equation-of-state parameter $w>0$, the initial singularity is not accompanied as it was discovered for radiation in earlier work. More interestingly, for pressureless dust ($w=0$), the initial state approaches a de Sitter state. This fact opens a new possibility of singularity-free nature of the theory. The anisotropy is mild, and does not develop curvature singularities in spacetime contrary to general relativity.

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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