New nonsingular cosmological solution of nonlocal gravity

被引:4
|
作者
Kolar, Ivan [1 ]
Maldonado Torralba, Francisco Jose [2 ]
Mazumdar, Anupam [1 ]
机构
[1] Univ Groningen, Van Swinderen Inst, NL-9747 AG Groningen, Netherlands
[2] Univ Tartu, Inst Phys, Lab Theoret Phys, W Ostwaldi 1, EE-50411 Tartu, Estonia
基金
芬兰科学院;
关键词
GRAVITATIONAL COLLAPSE; SINGULARITIES; UNIVERSE;
D O I
10.1103/PhysRevD.105.044045
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present a new bouncing cosmological solution of the nonlocal theory known as infinite derivative gravity, which goes beyond the recursive ansatz, square R = r(1)R + r(2). The nonlocal field equations are evaluated using the spectral decomposition with respect to the eigenfunctions of the wave operator. The energy-momentum tensor computed for this geometry turns out to be much more sensitive to the choice of the nonlocal form factor, since it depends on the value of the function on a continuous infinite interval. We show that this stronger dependence on the form factor allows us to source the geometry by the perfect fluid with the non-negative energy density satisfying the strong energy condition. We show that this bouncing behavior is not possible in the local theories of gravity such as, in general, relativity or R + R-2 gravity sourced by a fluid which meets the non-negative energy and strong energy conditions.
引用
收藏
页数:11
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