搜索结果: 1-6 共查到“相对论与引力场 cosmology”相关记录6条 . 查询时间(0.109 秒)
An old Einstein - Eddington generalized gravity and modern ideas on branes and cosmology
old Einstein - Eddington generalized gravity modern ideas branes cosmology
2010/12/20
We briefly discuss new models of an ‘affine’ theory of gravity in multidimensional space-times with symmetric connections. We use and generalize Einstein’s proposal to specify the space-time geometry ...
Conformal cosmology with a positive effective gravitational constant
Conformal cosmology positive effective gravitational constant
2010/12/20
The conformal cosmological model presented by Mannheim predicts a negative value for the effective gravitational constant, Geff. It also involves a scalar field, S, which is treated classically.
Observational constraints on Chaplygin cosmology in a braneworld scenario with induced gravity and curvature effect
Cosmology Dark energy -Cosmology theory- Cosmology Observations
2010/12/21
We study cosmological dynamics and late-time evolution of an extended induced grav-ity braneworld scenario. In this scenario, curvature effects are taken into account via the
Gauss-Bonnet term in the...
Brans-Dicke Cosmology in 4D from scalar-vacuum in 5D
Brans-Dicke Theory Kaluza-Klein Theory Modified General Relativity Cosmic Late-Time Acceleration
2010/3/17
We show that Brans-Dicke (BD) theory in 5D may explain the present cosmic accelerated expansion without recurring to matter fields in 5D or dark energy in 4D. Without making any assumption on the natu...
Non-standard loop quantum cosmology
Loop cosmology big bounce spectra of physical observables free parameter
2010/3/18
We present results concerning the nature of the cosmological big bounce(BB) transition within the loop geometry underlying loop quantum cosmology (LQC). Our canonical quantization method is an alterna...
Noether symmetric minisuperspace model of $f(R)$ cosmology
metric $f(R)$ cosmology symmetric minisuperspace
2010/3/18
We study the metric $f(R)$ cosmology using Noether symmetry approach by utilizing the behavior of the corresponding Lagrangian under infinitesimal generators of the desired symmetry. The existence of ...