Thermal Equilibrium of String Gas in Hagedorn Universe

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dc.creatorTakamizu, Yu-ichi
dc.creatorKudoh, Hideaki
dc.date2006-07-28
dc.date2006-11-21
dc.date.accessioned2026-07-07T10:26:00Z
dc.date.available2026-07-07T10:26:00Z
dc.descriptionThe 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.
dc.description23 pages,19 figures
dc.identifierhttps://arxiv.org/abs/hep-th/0607231
dc.identifierhttp://arxiv.org/abs/hep-th/0607231
dc.identifierPhys.Rev.D74:103511,2006
dc.identifierdoi:10.1103/PhysRevD.74.103511
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/176732
dc.subjectHigh Energy Physics - Theory
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectHigh Energy Physics - Phenomenology
dc.titleThermal Equilibrium of String Gas in Hagedorn Universe
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