Cosmological Bounces Induced by a Fermion Condensate.

Cosmological Bounces Induced by a Fermion Condensate.
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费米子凝聚引起的宇宙学反弹。

DOI:
10.1103/physrevlett.131.091001
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发表时间:
2023
影响因子:
8.6
通讯作者:
P. Steinhardt
P. Steinhardt
中科院分区:
物理与天体物理1区
文献类型:
--
作者:
G. Tukhashvili;P. Steinhardt

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我们证明,Nambu-Jona-Lasinio 类型的费米子凝聚有可能引起非奇异弹跳,将缓慢收缩阶段与膨胀阶段平滑地连接起来。手性凝聚——旋量双线性 ⟨Ψ[over ¯]Ψ⟩ 的非零真空期望值——可以在缓慢收缩阶段使宇宙变得平滑和平坦并且里奇曲率超过临界值后自发形成。在这种方法中,不需要高密度的自旋对齐的自由费米子,这避免了在弹跳阶段产生大的各向异性和启动混沌混合主行为的问题。
We show that it is possible for fermion condensation of the Nambu-Jona-Lasinio type to induce a nonsingular bounce that smoothly connects a phase of slow contraction to a phase of expansion. A chiral condensate-a nonzero vacuum expectation value of the spinor bilinear ⟨Ψ[over ¯]Ψ⟩-can form spontaneously after a slow contraction phase smooths and flattens the universe and the Ricci curvature exceeds a critical value. In this approach, a high density of spin-aligned free fermions is not required, which avoids the problem of generating a large anisotropy and initiating chaotic mixmaster behavior during the bounce phase.
超局域性和慢收缩
DOI: 10.1088/1475-7516/2021/06/013
发表时间: 2021
影响因子: 6.4
作者:
Ijjas, Anna;Sullivan, Andrew P.;Pretorius, Frans;Steinhardt, Paul J.;Cook, William G.
通讯作者: Cook, William G.
缓慢收缩对宇宙初始条件的鲁棒性
DOI: 10.1088/1475-7516/2020/08/030
发表时间: 2020
影响因子: 6.4
作者:
Ijjas, Anna;Cook, William G.;Pretorius, Frans;Steinhardt, Paul J.;Davies, Elliot Y.
通讯作者: Davies, Elliot Y.
DOI: 10.1016/j.physletb.2020.135690
发表时间: 2020-09-10
期刊: PHYSICS LETTERS B
影响因子: 4.4
作者:
Cook, William G.;Glushchenko, Iryna A.;Steinhardt, Paul J.
通讯作者: Steinhardt, Paul J.