1,894 research outputs found
Future singularity free accelerating expansion with the modified Poisson brackets
We show that the second accelerating expansion of the universe appears
smoothly from the decelerating universe remarkably after the initial inflation
in the two-dimensional soluble semi-classical dilaton gravity along with the
modified Poisson brackets of noncommutativity between the relevant fields.
However, the ordinary solution coming from the equations of motion following
the conventional Poisson algebra describes permanent accelerating universe
without any phase change. In this modified model, it turns out that the phase
transition is related to the noncommutative Poisson algebra.Comment: 13 pages, 2 figures; v2. to appear in Phys. Rev.
Thermodynamics of warped AdS black hole in the brick wall method
The statistical entropy of a scalar field on the warped AdS black hole in
the cosmological topologically massive gravity is calculated based on the
brick-wall method, which is different from the Wald's entropy formula giving
the modified area law due to the higher-derivative corrections in that the
entropy still satisfies the area law. It means that the entropy for scalar
excitations on this background is independent of higher-order derivative terms
or the conventional brick wall method has some limitations to take into account
the higher-derivative terms.Comment: 12 pages, 1 figure; v2. to appear in Phys. Lett. B; v3. typos
correcte
Recommended from our members
Integrated Educational Project of Theoretical, Experimental, and Computational Analyses
This research demonstrates how to design an integrated capstone project by including theoretical, experimental and computational analyses of a truss bridge. The project mainly focused on leading students to approach engineering problems with various methods and to understand the advantages and disadvantages of each method. The students applied three methods to acquire the values of stresses and deflections of members in the given truss bridge. First, they calculated the stresses and deformations theoretically. Second, they actually conducted an experiment of the truss bridge with electronic measuring equipment. Lastly, they built two simulation models with Autodesk Inventor and Dassault Systèmes SolidWorks. From the comparisons of above three methods, students were guided to the validation of assumptions of theories.Cockrell School of Engineerin
- …