Simple Brane World Scenario with Positive Five Dimensional Cosmological Constant
نویسندگان
چکیده
We present a simple brane-world model in five dimensions. In this model we do not need any fine-tuning between the five dimensional cosmological constant and the brane tension to obtain four dimensional flat Minkowski space. The spacetime of our solution has no naked singularities. Further the compactification scale of the fifth direction is automatically determined. [email protected] [email protected] [email protected]
منابع مشابه
A thermal instability for positive brane cosmological constant in the Randall-Sundrum cosmologies
We describe a novel dynamical mechanism to radiate away a positive four dimensional cosmological constant, Λ4, in the Randall-Sundrum cosmological scenario. We show that there are modes of the bulk gravitational field for which the brane is effectively a mirror. This will generally give rise to an emission of thermal radiation from the brane into the bulk. The temperature turns out to be nonvan...
متن کاملNonvanishing Cosmological Constant of Flat Universe in Brane-World Scenario
The finite temperature effect is examined in Randall-Sundrum brane-world scenario with inclusion of the matter fields on the brane. At zero temperature it is found that the theory on the brane is conformally invariant, which guarantees AdS/CFT. At 4d effective action we derived a temperature-dependent nonvanishing cosmological constant at the flat spacetime limit of brane worldvolume. At the co...
متن کاملVacuum Polarization in an Anti-de Sitter Space as an Origin for a Cosmological Constant in a Brane World
In this Letter we show that the vacuum polarization of quantum fields in an anti-de Sitter space naturally gives rise to a small but nonzero cosmological constant in a brane world living in it. To explain the extremely small ratio of mass density in the cosmological constant to the Planck mass density in our universe (≈ 10) as suggested by cosmological observations, all we need is a four-dimens...
متن کاملCosmological Brane Perturbations a
At the end of the last millennium it was realized that the traditional Kaluza-Klein approach is not the only possibility of dimensional reduction. An alternative approach was developed, the brane-world scenario. In this scenario the standard matter fields are constrained to a lower dimensional hypersurface, or brane, which is embedded in a higher dimensional spacetime, or bulk. The gravitationa...
متن کاملLocalization of Matter and Cosmological Constant on a Brane in Anti de Sitter Space
We study two issues, the localization of various spin fields, and the problem of the cosmological constant on a brane in five-dimensional anti de Sitter space. We find that spin-zero fields are localized on a positive-tension brane. In addition to the localized zero-mode there is a continuous tower of states with no mass gap. Spin one-half and three-half states can be localized on a brane with ...
متن کامل