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arXiv 0811.0566astro-phgr-qchep-phhep-th
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宇宙电磁场与暗能量

Cosmological electromagnetic fields and dark energy

Jose Beltran Jimenez, Antonio L. Maroto

摘要:

我们表明,在宇宙尺度上的时间电磁场的存在下产生一个有效的宇宙学常数,它可以解释宇宙的加速膨胀。在电弱尺度暴胀过程中产生的原始电磁量子涨落可以自然地解释这个场的存在,也可以解释暗能量密度的测量值。电磁场在宇宙学尺度上的行为被发现不同于研究得很好的短距离行为,事实上,非零宇宙学常数的存在可能是宇宙学尺度上规范不变性崩溃的信号。该理论与所有的局部引力检验是相容的,并且没有经典或量子不稳定性。由此可见,不仅暗能量的真实性质无需借助新的物理学就能得到确立,而且宇宙学常数的值在标准暴胀宇宙学的背景下也能得到自然的解释。通过对宇宙微波背景辐射各向异性和大尺度结构的观测,可以将这种机制与真正的宇宙学常数区别开来。

英文摘要:

We show that the presence of a temporal electromagnetic field on cosmological scales generates an effective cosmological constant which can account for the accelerated expansion of the universe. Primordial electromagnetic quantum fluctuations produced during electroweak scale inflation could naturally explain the presence of this field and also the measured value of the dark energy density. The behavior of the electromagnetic field on cosmological scales is found to differ from the well studied short-distance behavior and, in fact, the presence of a non-vanishing cosmological constant could be signalling the breakdown of gauge invariance on cosmological scales. The theory is compatible with all the local gravity tests, and is free from classical or quantum instabilities. Thus we see that, not only the true nature of dark energy can be established without resorting to new physics, but also the value of the cosmological constant finds a natural explanation in the context of standard inflationary cosmology. This mechanism could be discriminated from a true cosmological constant by upcoming observations of CMB anisotropies and large scale structure.

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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