Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2006-07-28
Phys.Rev.D74:103511,2006
Physics
High Energy Physics
High Energy Physics - Theory
23 pages,19 figures
Scientific paper
10.1103/PhysRevD.74.103511
The thermal equilibrium of string gas is necessary to activate the Brandenberger-Vafa mechanism, which makes our observed 4-dimensional universe enlarge. Nevertheless, the thermal equilibrium is not realized in the original setup, a problem that remains as a critical defect. We study thermal equilibrium in the Hagedorn universe, and explore possibilities for avoiding the issue aforementioned flaw. We employ a minimal modification of the original setup, introducing a dilaton potential. Two types of potential are investigated: exponential and double-well potentials. For the first type, the basic evolutions of universe and dilaton are such that both the radius of the universe and the dilaton asymptotically grow in over a short time, or that the radius converges to a constant value while the dilaton rolls down toward the weak coupling limit. For the second type, in addition to the above solutions, there is another solution in which the dilaton is stabilized at a minimum of potential and the radius grows in proportion to $t$. Thermal equilibrium is realized for both cases during the initial phase. These simple setups provide possible resolutions of the difficulty.
Kudoh Hideaki
Takamizu Yu-ichi
No associations
LandOfFree
Thermal Equilibrium of String Gas in Hagedorn Universe does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Thermal Equilibrium of String Gas in Hagedorn Universe, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Thermal Equilibrium of String Gas in Hagedorn Universe will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-250743