Matter and Antimatter: Why Did Matter Dominate?

[joychandra]

As matter & antimatter are equally created in the early universe , then why matter dominated over antimatter. Please suggest any possible answer

 

[protonchain]

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.

 

[Nick89]

I believe your question is one of the largest unsolved 'mysteries' in physics today. So don't expect an answer anytime soon hehe.

 

[ZapperZ]

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.

 

[joychandra]

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.

 

[tom.stoer]

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).

 

[Vanadium 50]

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.