Browsing by Subject "Vacuum energy"
Now showing items 19 of 9

Affine inflation
(American Physical Society, 201706)Affine gravity, a gravity theory based on affine connection with no notion of metric, supports scalar field dynamics only if scalar fields have nonvanishing potential. The nonvanishing vacuum energy ensures that the ... 
Boundary shape and Casimir energy
(IOP Publishing, 200908)Casimir energy changes are investigated for geometries obtained by small but arbitrary deformations of a given geometry for which the vacuum energy is already known for the massless scalar field. As a specific case, ... 
Cosmological consequences of a variable cosmological constant model
(World Scientific Publishing, 201706)We derive a model of dark energy which evolves with time via the scale factor. The equationofstate is studied as a function of a parameter α introduced in this model as = (1  2α)/(1 + 2α). In addition to the recent ... 
Cosmological implications of affine gravity
(Izmir Institute of Technology, 201804)The main aim of this thesis is to reveal some interesting aspects of the purely affine theory of gravity and its cosmological implication. A particular attention will be devoted to its consequences when applied to cosmological ... 
Eddington's gravity in immersed spacetime
(IOP Publishing, 20150319)We formulate Eddington's affine gravity in a spacetime that is immersed in a larger eightdimensional space endowed with a hypercomplex structure. The dynamical equation of the first immersed Riccitype tensor leads to ... 
New casimir energy calculations
(World Scientific Publishing, 2007)New Casimir energy results for massless scalar field in some 3 dimensional cavities are presented. We attempted to discuss the correlation between the sign and the magnitude of the energy and the shape of the cavities. ... 
Separate EinsteinEddington spaces and the cosmological constant
(Wiley, 20160501)Based on Eddington affine variational principle on a locally product manifold, we derive the separate Einstein space described by its Ricci tensor. The derived field equations split into two field equations of motion that ... 
Vacuum energy as the origin of the gravitational constant
(Springer, 200911)We develop a geometrodynamical approach to the cosmological constant problem (CCP) by invoking a geometry induced by the energymomentum tensor of vacuum, matter and radiation. The construction, which utilizes the dual ... 
A way to get rid of cosmological constant and zeropoint energy problems of quantum fields through metric reversal symmetry
(IOP Publishing, 200806)In this paper, a framework is introduced to remove the huge discrepancy between the empirical value of the cosmological constant and the contribution to the cosmological constant predicted from the vacuum energy of quantum ...