منابع مشابه
Violence in the Dark Ages
A wide range of observational and theoretical arguments suggest that the universe experienced a period of heating and metal enrichment, most likely from starbursting dwarf galaxies. Using a hydrodynamic simulation we have conducted a detailed theoretical investigation of this epoch at the end of the cosmological “dark ages”. Outflows strip baryons from pre-viralized halos with total masses ∼ <1...
متن کاملThe dark ages of the universe.
The Dark Age is the period between the time when the cosmic microwave background was emitted and the time when the evolution of structure in the universe led to the gravitational collapse of objects, in which the first stars were formed. The period of reionization started with the ionizing light from the first stars, and it ended when all the atoms in the intergalactic medium had been reionized...
متن کاملProbing the End of the Dark Ages
In currently popular cosmological scenarios – all variants of the cold dark matter (CDM) cosmogony – some time beyond a redshift of 15, stars within the numerous small halos that condense with virial temperatures ∼ 10 K created the first heavy elements; these protogalactic systems, together perhaps with an early population of mini-quasars, generated the ultraviolet radiation and mechanical ener...
متن کاملParticle decays during the cosmic dark ages
We consider particle decays during the cosmic dark ages with two aims: ~1! to explain the high optical depth reported by the Wilkinson Microwave Anisotropy Probe ~WMAP!, and ~2! to provide new constraints to the parameter space for decaying particles. We delineate the decay channels in which most of the decay energy ionizes and heats the intergalactic medium gas @and thus affects the cosmic mic...
متن کاملNeutralino Annihilations and the Gas Temperature in the Dark Ages
Assuming the dark matter is made entirely from neutralinos, we re-visit the role of their annihilation on the temperature of diffuse gas in the high redshift universe. We consider neutralinos of particle mass 36 GeV and 100 GeV, respectively. The former is able to produce ∼ 7 ee particles per annihilation through the fremionic channel, and the latter ∼ 53 particles assuming a purely bosonic cha...
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ژورنال
عنوان ژورنال: IJASOS- International E-journal of Advances in Social Sciences
سال: 2015
ISSN: 2411-183X
DOI: 10.18769/ijasos.81667