Cosmic eggs to relax the cosmological constant
Cosmic eggs to relax the cosmological constant
复制标题
放宽宇宙常数的宇宙蛋
DOI:
10.1088/1475-7516/2021/08/064
复制
发表时间:
2021
影响因子:
6.4
通讯作者:
T. Van Riet
中科院分区:
文献类型:
--
作者:
T. Hertog;R. Tielemans;T. Van Riet
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