25 research outputs found
Dynamics of Generalized Tachyon Field in Teleparallel Gravity
We study dynamics of generalized tachyon scalar field in the framework of
teleparallel gravity. This model is an extension of tachyonic teleparallel dark
energy model which has been proposed in [26]. In contrast with tachyonic
teleparallel dark energy model that has no scaling attractors, here we find
some scaling attractors which means that the cosmological coincidence problem
can be alleviated. Scaling attractors present for both interacting and
non-interacting dark energy, dark matter cases.Comment: 14 pages, 20 figure
Thermodynamics of an Evaporating Schwarzschild Black Hole in Noncommutative Space
We investigate the effects of space noncommutativity and the generalized
uncertainty principle on the thermodynamics of a radiating Schwarzschild black
hole. We show that evaporation process is in such a way that black hole reaches
to a maximum temperature before its final stage of evolution and then cools
down to a nonsingular remnant with zero temperature and entropy. We compare our
results with more reliable results of string theory. This comparison Shows that
GUP and space noncommutativity are similar concepts at least from view point of
black hole thermodynamics.Comment: 15 Pages, 2 Figures, revised and refernces adde
Can Quantum Gravitational Effects Manifest themselves at Large Distances?
Consider a proposed model of the universe with much greater than its
well-known value of . In this model universe, very large objects
can show quantum behaviors. In a scenario with large extra dimensions,
can attains very large values depending on the dimensionality of spacetime. In
this letter, we show that although conventional thinking indicates that quantum
gravitational effects should manifest themselves only at very small scales, in
actuality quantum gravitational effects can manifest themselves at large scales
too. We use the generalized uncertainty principle with a non-zero minimal
uncertainty in momentum as our primary input to construct a mathematical
framework for our proposal.Comment: 7 Pages, No Figure
Generalized Uncertainty Principle, Modified Dispersion Relations and Early Universe Thermodynamics
In this paper, we study the effects of Generalized Uncertainty Principle(GUP)
and Modified Dispersion Relations(MDRs) on the thermodynamics of
ultra-relativistic particles in early universe. We show that limitations
imposed by GUP and particle horizon on the measurement processes, lead to
certain modifications of early universe thermodynamics.Comment: 21 Pages, 3 eps Figure, Revised Versio