The cosmological constant problem and the extra dimensions of N=2 D=5 supergravity

被引：1

作者：

Salem, Safinaz ^{[1
]}

机构：

[1] Al Azhar Univ, Fac Sci, Dept Phys, Cairo 11765, Egypt

来源：

PHYSICS OF THE DARK UNIVERSE | 2024年 / 44卷

关键词：

Supergravity; Extra-dimensions; Dark energy;

D O I：

10.1016/j.dark.2024.101499

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We propose an interpretation for the cosmological constant problem based on modeling the universe as a 3-brane embedded in the bulk of 5 -dimensional supergravity with hypermultiplets. When solving the modified Friedmann equations the complex structure moduli of the Calabi-Yau manifold cancel the large value of the vacuum energy density on the brane, wherein this value transfers to an Anti -de Sitter fifth dimensional bulk compactified on a scale (similar to 10-26 m). An effective dark energy density is produced on the brane which equals the observed value responsible for the late -time acceleration of the universe. The bulk undergoes a decelerated contraction while we show that cosmic expansion of the brane-universe consists with the recent observed data of the ACDM model. On the other hand, through this model, the hierarchy between the electroweak scale (MEW = 100 GeV) and the Planck scale (Mpl similar to 1018 GeV) is interpreted by compactifying the 6 -extra dimensions of D = 5 supergravity on a sub -millimeters scale, where the fundamental scale of gravity within these extra dimensions is MEW.

引用

页数：6

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