Cosmic eggs to relax the cosmological constant

Cosmic eggs to relax the cosmological constant
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放宽宇宙常数的宇宙蛋

DOI:
10.1088/1475-7516/2021/08/064
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发表时间:
2021
影响因子:
6.4
通讯作者:
T. Van Riet
T. Van Riet
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
T. Hertog;R. Tielemans;T. Van Riet

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在额外维度的理论中,宇宙层次问题可以被认为是可观测宇宙的卡鲁扎-克莱因单位的不自然的大半径。我们勾勒出一个动力学机制,放松这一点。在我们提出的早期宇宙场景中,三个大的空间维度通过从“宇宙蛋”中隧穿而产生,这是一种有效的一维配置,所有空间维度都是紧凑的,并且具有可比的小尺寸。如果弦的景观是由低维紧化所主导的,宇宙蛋将是宇宙学的自然初始条件。对玩具蛋模型的量子宇宙学处理预测,在哈特-霍金态的一个变体中,宇宙蛋破裂形成具有小但正的宇宙学常数或精华能量的高维宇宙。因此,宇宙蛋宇宙学给出了这样一个场景,在这个场景中,真空能量的看似不自然的小观测值可以从自然的初始条件中产生。
In theories with extra dimensions, the cosmological hierarchy problem can be thought of as the unnaturally large radius of the observable universe in Kaluza-Klein units. We sketch a dynamical mechanism that relaxes this. In the early universe scenario we propose, three large spatial dimensions arise through tunneling from a `cosmic egg', an effectively one-dimensional configuration with all spatial dimensions compact and of comparable, small size. If the string landscape is dominated by low-dimensional compactifications, cosmic eggs would be natural initial conditions for cosmology. A quantum cosmological treatment of a toy model egg predicts that, in a variant of the Hartle-Hawking state, cosmic eggs break to form higher dimensional universes with a small, but positive cosmological constant or quintessence energy. Hence cosmic egg cosmology yields a scenario in which the seemingly unnaturally small observed value of the vacuum energy can arise from natural initial conditions.
DOI: 10.1002/prop.201800086
发表时间: 2018-08
期刊: Fortschritte der Physik
影响因子: --
作者:
S. Kachru;S. Trivedi
通讯作者: S. Kachru;S. Trivedi