Flare-Up of the Universe after z≃10^2 for Cosmic String Model

概要

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Sheet-like wakes are formed behind moving cosmic strings, for cold dark matter and baryonic matter have accumulated to the plane swept by the cosmic strings. The fragmentation of the wake has continuously occurred in the plane and the mass of the fragments at z≃10^2 is of the order of M_f≃10^7(Gμ/10^<-6>)^3M_⊙ (the first system). Around the epoch z≃10^2, baryonic matter (M_<fb>≃10^6M_⊙) within the first systems has begun to contract due to H_2 cooling, and Population III stars with masses of 10^<-1>〜10^2M⊙ may be formed by the fragmentation within such systems. The large scale mesh-like traces of moving cosmic strings are superimposed on the structure of the universe and these patterns have simultaneously begun to be luminous at this epoch. The ratio of the accumulated matter in the wakes to the total matter at z≃10^2 is about 10^<-3>. The effects of such Population III stars on the surrounding space by radiative ionizations and shock waves are investigated. The second, third and succeeding baryonic sheets are formed after the isothermal plane shocks. Under moderate parameters, the remaining interwake medium could have been heated up until now. From these sheets, the secondary systems are formed, which may correspond to the globular clusters or dwarf galaxies. The galaxy formation (z≦8) near wakes and sheets(secondary systems) after heat-up of the universe is briefly discussed.
理論物理学刊行会の論文
1987-11-25