The object of the present paper is to study N (k)-quasi-Einstein manifolds. We study an N (k)-
quasi-Einstein manifold satisfying the curvature conditions $ R ({\xi}, X){\cdot} Z= 0$, $ Z …

A straightforward simple proof is given that dark energy is the natural conse-quence of a
quantum disentanglement physical process. Thus while the ordinary energy density of the …

The four-dimensional character of Einstein's spacetime is generally accepted in mainstream
physics as beyond reasonable doubt correct. However the real problem is when we require …

In a one-dimension Mauldin-Williams Random Cantor Set Universe, the Sigalotti topological
speed of light is where. It follows then that the corresponding topological acceleration must …

In this study, we consider the N(k)- quasi Einstein manifolds with respect to a type of semi-
symmetric metric connection. We suppose that the generator of N(k)- quasi-Einstein …

The object of the present paper is to introduce spacetimes with pseudosymmetric
energymomentum tensor. In this paper at first we consider the relation R (X, Y)· T= fQ (g, T) …

The topological speed of light which may be used to compute the density of ordinary energy
and dark energy of the cosmos is replaced by dimensionless quantity taken from Special …

In this paper, at the first in our main results, we introduce new classes of N (k)-quasi Einstein
manifolds. Moreover, we consider N (k)-quasi Einstein manifold satisfying the conditions R …

The object of the present paper is to study N (k)-quasi-Einstein manifolds. Existence of N (k)-
quasi Einstein manifolds is proved by a non-trivial example. Also some physical examples of …

The object of the present paper is to study the m-projective curvature tensor on N (k)-quasi-
Einstein manifolds. The existence of N (k)-quasi Einstein manifolds is proved by two non …