Search Results

Now showing 1 - 2 of 2

Citation - WoS: 21
Citation - Scopus: 22
Vacuum Energy as the Origin of the Gravitational Constant
(Springer Verlag, 2009) Demir, Durmuş Ali
We develop a geometro-dynamical approach to the cosmological constant problem (CCP) by invoking a geometry induced by the energy-momentum tensor of vacuum, matter and radiation. The construction, which utilizes the dual role of the metric tensor that it structures both the spacetime manifold and energy-momentum tensor of the vacuum, gives rise to a framework in which the vacuum energy induced by matter and radiation, instead of gravitating, facilitates the generation of the gravitational constant. The non-vacuum sources comprising matter and radiation gravitate normally. At the level of classical gravitation, the mechanism deadens the CCP yet quantum gravitational effects, if strong, can keep it existent.
Citation - WoS: 2
Citation - Scopus: 2
Single Scale Factor for the Universe From the Creation of Radiation and Matter Till the Present
(Springer Verlag, 2014) Erdem, Recai
A scheme for incorporating the creation of radiation and matter into the cosmological evolution is introduced so that it becomes possible to merge the times before and after the creation of radiation and matter in a single scale factor in the Robertson–Walker metric. This scheme is illustrated through a toy model that has the prospect of constituting a basis for a realistic model.

Physics / Fizik