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The horizon problem describes the fact that we see isotropy in the CMB temperature across the entire sky, despite the entire sky not being in causal contact to establish thermal equilibrium. Refer to the timespace diagram to the right for a visualization of this problem.
Cosmological in ation is widely considered an integral and empirically success-ful component of contemporary cosmology. It was originally motivated by its solution of certain ne-tuning problems of the hot big bang model, particularly what are known as the horizon problem and the atness problem.
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Apr 15, 2024 · What is the Horizon Problem in Cosmology? In cosmology, the horizon problem refers to the challenge of explaining how distant parts of the universe, which are beyond each other’s observable horizons, can have the same temperature and other physical properties.
Questions and model answers on Concentration of Solutions for the AQA GCSE Chemistry syllabus, written by the Chemistry experts at Save My Exams.
The horizon problem indicates that regions of space separated by vast distances are remarkably uniform in temperature and density, challenging traditional Big Bang cosmology. One explanation for the horizon problem is inflation, where a rapid expansion allows distant regions to become causally connected before being driven apart.
This problem is known as the horizon problem, and was first identified by Cjharles Misner in the 1960's. The horizon problem has motivated many theoretical models explaining how either the regions came into contact, or were in an initial state such that their properties were similar.
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The horizon problem, which leads to the causality arguments, arises only in the world models where homogeneity and isotropy (cosmological principle) is presumed to begin with.
