Bouncing Cosmology in Fourth-Order Gravity

被引：3

作者：

Miranda, Marcello ^{[1
,2
]}

Vernieri, Daniele ^{[2
,3
]}

Capozziello, Salvatore ^{[1
,2
,3
,4
]}

Lobo, Francisco S. N. ^{[5
,6
]}

机构：

[1] Scuola Super Merid, Largo San Marcellino 10, I-80138 Naples, Italy

[2] Ist Nazl Fis Nucl, Sez Napoli, Complesso Univ Monte St Angelo, Edificio G,Via Cinthia, I-80126 Naples, Italy

[3] Univ Napoli Federico II, Complesso Univ Monte St Angelo, Dipartimento Fis E Pancini, Edificio G,Via Cinthia, I-80126 Naples, Italy

[4] Tomsk State Univ Control Syst & Radioelect TUSUR, Int Ctr Grav & Cosmos, Lab Theoret Cosmol, Tomsk 634050, Russia

[5] Univ Lisbon, Inst Astrofis & Ciencias Espaco, Fac Ciencias, Edificio C8, P-1749016 Lisbon, Portugal

[6] Univ Lisbon, Fac Ciencias, Dept Fis, Edificio C8, P-1749016 Lisbon, Portugal

来源：

UNIVERSE | 2022年 / 8卷 / 03期

关键词：

extended theories of gravity; bouncing cosmology; order reduction; EMERGENT UNIVERSE; INFLATION;

D O I：

10.3390/universe8030161

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The Big Bang initial singularity problem can be solved by means of bouncing solutions. In the context of extended theories of gravity, we will look for covariant effective actions whose field equations contain up to fourth-order derivatives of the metric tensor. In finding such bouncing solutions, we will make use of an order reduction technique based on a perturbative approach. Reducing the order of the field equations to second-order, we are able to find solutions which are perturbatively close to General Relativity. We will build the covariant effective actions of the resulting order reduced theories.

引用

页数：9

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