9 research outputs found
Noncommutativity in quantum cosmology and the Hierarchy problem
We study the quantum cosmology of an empty (4+1)-dimensional Kaluza-Klein
cosmology with a negative cosmological constant and a FRW type metric with two
scale factors, one for 4-D universe and the other for one compact extra
dimension. By assuming the noncommutativity in the corresponding
mini-superspace we suggest a solution for the Hierarchy problem, at the level
of Wheeler-DeWitt equation.Comment: 7 pages; Title, abstract and text changed; references added; to
appear in PL
Reconstruction of , and models inspired by variable deceleration parameter
We study an special law for the deceleration parameter, recently proposed by
Akarsu and Dereli, in the context of , and
theories of modified gravity. This law covers the law of Berman for obtaining
exact cosmological models to account for the current acceleration of the
universe, and also gives the opportunity to generalize many of the dark energy
models having better consistency with the cosmological observations. Our aim is
to reconstruct the , and models inspired by this
law of variable deceleration parameter. Such models may then exhibit better
consistency with the cosmological observations.Comment: 18 pages, Published online in Astrophys. Space. Sc