Scale covariant theory as a dark energy model

Abstract

We consider it worthy if we could construct a realistic model universe that would enable us to identify a clue about the source of dark energy. So, we develop a Scale Covariant Theory model universe considering a 5D spherically symmetric space-time. It is predicted that the constructed model itself behaves as a phantom energy model/source that tends to a de Sitter phase avoiding the finite-time future singularity (big rip). The model universe is isotropic and is free from an initial singularity. The gravitational constant [Formula: see text] decreases with a variation of [Formula: see text][Formula: see text]yr[Formula: see text] and the Hubble parameter is estimated to be [Formula: see text]. We also provide a thorough analysis of the cosmological findings with graphical representations.

Thermodynamics, phase structure and quasinormal modes for AdS Heyward massive black hole

“…Vegh introduced the dRGT-like massive theories of the different classes by modification in the reference metric. Considering this theory of massive gravity different classes of the BH solutions have been studied in [49][50][51][52][53][54][55][56][57][58][59][60][61][62][63][64][65][66].…”

Krylov Complexity of Fermionic and Bosonic Gaussian States

“…[40,[43][44][45][46][47][48][49][50][51][52][53] One intriguing aspect of Gaussian states is that the action on the covariance matrix can characterize the transition from one Gaussian state to another. [43,[54][55][56][57] For Bosonic Gaussian states, the non-trivial components of this matrix are symmetric, while they are antisymmetric for Fermionic states. However, we found that the covariance matrix alone is insufficient for calculating Krylov complexity, as it lacks information on the relative phase.…”