New nonsingular cosmological solution of nonlocal gravity
New nonsingular cosmological solution of nonlocal gravity
复制标题
非局域引力的新非奇异宇宙学解
作者：
I. Kolář;F. J. M. Torralba;A. Mazumdar
我们提出了一种新的非局域理论的弹跳宇宙学解，称为无限导数引力，它超越了递归 ansatz ${Box R = r_1 R +r_2}$。使用波算子本征函数的谱分解来评估非局部场方程。事实证明，针对该几何形状计算的能量动量张量对非局部形状因子的选择更加敏感，因为它取决于连续无限区间上的函数值。我们证明，这种对形状因子的更强依赖性使我们能够通过具有满足强能量条件的非负能量密度的完美流体来获取几何形状。我们证明这种弹跳行为在局域引力理论中是不可能的，例如广义相对论或由满足非负能量和强能量条件的流体产生的 $R+R^2$ 引力。
We present a new bouncing cosmological solution of the non-local theory known as infinite derivative gravity, which goes beyond the recursive ansatz, ${Box R = r_1 R +r_2}$. The non-local 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 non-local 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 behaviour 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.
影响因子：
5
作者：
Kolář, Ivan;Boos, Jens
通讯作者：
Boos, Jens