Cosmological Bounces Induced by a Fermion Condensate.
Cosmological Bounces Induced by a Fermion Condensate.
复制标题
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
中科院分区:
文献类型:
--
作者:
G. Tukhashvili;P. Steinhardt
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.
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.
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.
影响因子:
4.4
作者:
Cook, William G.;Glushchenko, Iryna A.;Steinhardt, Paul J.
通讯作者:
Steinhardt, Paul J.