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The Standard Model can incorporate baryogenesis, though the amount of net baryons (and leptons) thus created may not be sufficient to account for the present baryon asymmetry. There is a required one excess quark per billion quark-antiquark pairs in the early universe in order to provide all the observed matter in the universe. [3]
Particle physics models which account for dark matter or which lead to successful baryogenesis may predict a strongly first-order electroweak phase transition. [20] The electroweak baryogenesis model may explain the baryon asymmetry in the universe, the observation that the amount of matter vastly exceeds the amount of matter. [4]
The Affleck–Dine mechanism (AD mechanism) is a postulated mechanism for explaining baryogenesis during the primordial Universe immediately following the Big Bang.Thus, the AD mechanism may explain the asymmetry between matter and antimatter in the current Universe.
In physical cosmology, the baryon asymmetry problem, also known as the matter asymmetry problem or the matter–antimatter asymmetry problem, [1] [2] is the observed imbalance in baryonic matter (the type of matter experienced in everyday life) and antibaryonic matter in the observable universe.
Physical cosmology is a branch of cosmology concerned with the study of cosmological models. A cosmological model, or simply cosmology, provides a description of the largest-scale structures and dynamics of the universe and allows study of fundamental questions about its origin, structure, evolution, and ultimate fate. [1]
Such non-conservation of baryon number is indeed assumed to have happened in the early universe, and is known as baryogenesis. However, in some theoretical models, it is suggested that leptogenesis also occurred prior to baryogenesis; thus the term leptogenesis is often used to imply the non-conservation of leptons without corresponding non ...
A possible answer to this question is baryogenesis, the hypothetical physical process that took place during the early universe that produced baryonic asymmetry, i.e. the imbalance of matter (baryons) and antimatter (antibaryons) in the observed universe. However, baryogenesis is only possible under the following conditions proposed by Andrei ...
Schematic timeline of the universe, depicting reionization's place in cosmic history. Reionization refers to a change in the intergalactic medium from neutral hydrogen to ions. The neutral hydrogen had been ions at an earlier stage in the history of the universe, thus the conversion back into ions is termed a reionization. The reionization was ...