Matter and Antimatter: Why Did Matter Dominate?

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Discussion Overview

The discussion centers on the question of why matter dominated over antimatter in the early universe, exploring potential explanations and the nature of matter-antimatter differences. It encompasses theoretical considerations and speculative reasoning regarding fundamental physics concepts.

Discussion Character

  • Exploratory
  • Debate/contested
  • Technical explanation

Main Points Raised

  • Some participants suggest that matter and antimatter were created equally in the early universe, questioning why matter became dominant.
  • Others argue that slightly more matter was created, leading to the current observable universe, but note that the reasons for this imbalance are not fully understood.
  • A participant highlights CP violation in certain processes, such as kaon decay, as a leading candidate for explaining the matter-antimatter imbalance.
  • Questions are raised about the differences between matter and antimatter, with some asserting that they share the same properties except for charge, while others mention parity and CP asymmetries affecting certain interactions.
  • There is a contention regarding the lifetimes of particles and antiparticles, with one participant asserting they are the same due to CPT symmetry, while another suggests slight differences in lifetimes may exist.

Areas of Agreement / Disagreement

Participants express differing views on the creation of matter and antimatter, the implications of CP violation, and the properties of particles and antiparticles, indicating that multiple competing views remain and the discussion is unresolved.

Contextual Notes

Some claims depend on specific definitions of properties and interactions, and there are unresolved questions regarding the implications of CP violation and the nature of particle lifetimes.

joychandra
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As matter & antimatter are equally created in the early universe , then why matter dominated over antimatter. Please suggest any possible answer
 
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They're not equally created. Slightly more matter was created the resulted in the universe we see today.

No-one truly understand the reasons why matter had a slightly larger abundance. This is (at this present time) beyond the scope of observational capabilities.
 
I believe your question is one of the largest unsolved 'mysteries' in physics today. So don't expect an answer anytime soon hehe.
 
joychandra said:
As matter & antimatter are equally created in the early universe , then why matter dominated over antimatter. Please suggest any possible answer

The leading candidate for the explanation on the matter-antimatter imbalance is the CP violation in certain events, such as in kaon decay.

http://physicsworld.com/cws/article/print/17755

Zz.
 
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What are the differences between matter and antimatter. I know they have same spin, same mass and opposite charge. Does there are any other minute differences? Please mention.
 
Basically there are no differences except for the opposite charge (you've already mentioned).

There is one exception, namely the parity and parity-charge asymmetry of the weak interaction. Due to the violation of the P- and CP-symmetry matter and antimatter have slightly different properties. Lifetime of some particles and antiparticles may differ slightly. This effect is extremely small and was observed in neutral K- and B-meson decays. For all other systems matter and antimatter have identical properties (which means that differences may exist but are too small to be visible in experiments).
 
tom.stoer said:
Lifetime of some particles and antiparticles may differ slightly.

Not so. Lifetimes of particles and antiparticles are the same. CPT assures this. What can be different are branching fractions.
 

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