This point, constitute a powerful challenge to the cosmological viability of MOG. Keywords: Modified gravity, Structure formation, Linear perturbations, Dark matter, Scalar-tensor-vector gravitydoi:10.1016/j.physletb.2020.135238Sara Jamali aMahmood Roshan a bLuca Amendola cPhysics Letters B
张量(Tensor)、标量(scalar)、向量(vector)、矩阵(matrix) Python Numpy 切片和索引(高级索引、布尔索引、花式索引) Python NumPy 广播(Broadcast) 张量(Tensor):Tensor = multi-dimensional array of numbers 张量是一个多维数组,它是标量,向量,矩阵的高维扩展 ,是一个数据容器,张量是矩阵向任意维度的推广 注意,张...
张量(Tensor)、标量(scalar)、向量(vector)、矩阵(matrix) 张量(Tensor):Tensor = multi-dimensional array of numbers 张量是一个多维数组,它是标量,向量,矩阵的高维扩展 ,是一个数据容器,张量是矩阵向任意维度的推广 注意,张量的维度(dimension)通常叫作轴(axis), 张量轴的个数也叫作阶(rank)] 标量(scalar)...
张量(Tensor)、标量(scalar)、向量(vector)、矩阵(matrix) Python Numpy 切片和索引(高级索引、布尔索引、花式索引) Python NumPy 广播(Broadcast) 张量(Tensor):Tensor = multi-dimensional array of numbers 张量是一个多维数组,它是标量,向量,矩阵的高维扩展 ,是一个数据容器,张量是矩阵向任意维度的推广 注意,张...
(Phys. Rev. D 79, 044014 (2009), arXiv:0901.3730) in which the Eddington-Robertson parameters for our modified gravity theory (MOG) are derived. We show by explicit calculation that the role of the vector field $\\phi_\\mu$ cannot be ignored in this derivation....
1.标量(Scalar)数值量。 2.向量(Vector)数值量加方向,数值表示每个维度上的量,而 1 维数组的项数表示空间维度数。 3.矩阵(Matrix)数值量加方向,数值表示每个维度上的量,而 2 维数来表示空间维度数。 4.张量(Tensor)抽象表达的不是维度而是维度的等级。比如标量
gravity has been investigated, and it has been shown that the well known exact solutions of general relativity can be reproduced properly [42,43]. For instance, although the Reissner-Nordtröm solution in the standard version of gravity theory (general relativity) corresponds to an electrically ...
Such effective theories of gravity can include a finite number of tensor, vector or scalar fields as well as higher derivatives of these fields. Higher-derivative actions appeared initially from interest in the higher energy behavior of gravitation and cosmology or as leading order corrections of ...
Instead of a scalar field, one can introduce an additional spin-1 field into the gravity sector with a richer phenomenology due to the existence of intrinsic vector modes. Analogous to scalar–tensor Horndeski theories, it is possible to construct most general vector–tensor theories with second...
In order to construct a unique theory of scalar-tensor gravity one is usually forced to choose this vector. In torsion theories of gravity, the choice of setting the non-metricity equal to zero corresponds to taking the projective freedom away and ...