Why more matter than antimatter

In summary, the creation of matter and antimatter during the big bang led to a balance between the two. However, due to certain conditions known as Sakharov conditions, there was a shift towards more matter being created. This imbalance led to the survival of particles with no charge, resulting in a matter-filled universe. The standard model of particle physics offers some explanations for this imbalance, but a conclusive theory is still lacking. One proposed idea is that an event horizon at the big bang could have resulted in the survival of particles over their antiparticles, further contributing to the asymmetry.
  • #1
ownedbyphysics
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If there is duality, at the big bang, when matter and antimatter was created, why did the balance shift to matter? Someone told me that there is a theory that the particles that have no charge was left over and created matter?
 
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  • #2
Take a look to the wikipedia entry about baryogenesis. To create this disbalance between matter and antimatter some conditions (called Sakharov conditions) are needed. The standard model of particle physics explains at least partially how these conditions might have taken place, but there is still no conclusive theory about matter antimatter asymmetry.
 
  • #3
The balance shifted because, as hellfire said, certain conditions arose such that you had more matter to start with and/or more was created through photon interaction.

Thus when the matter and antimatter annihilated each other there was an excess of matter thus we have a matter filled universe today.
 
  • #4


i also heard an idea that, if their was an event horizon at the big bang, and an antiparticle- particle pair were next to it yet only the antiparticle was in it, then the particle would survive and become a real particle
 
  • #5


I can provide a response to your question about the imbalance of matter and antimatter in the universe.

The current understanding of the universe is based on the Big Bang theory, which states that the universe began as a hot, dense and expanding state about 13.8 billion years ago. According to this theory, matter and antimatter were created in equal amounts during the early stages of the universe.

However, as the universe expanded and cooled, matter and antimatter particles began to interact and annihilate each other, producing energy in the form of photons. This process is known as baryogenesis, and it is believed to have led to the dominance of matter over antimatter in the early universe.

One explanation for this imbalance is that there is a slight difference in the behavior of matter and antimatter particles, known as CP-violation. This tiny difference, which is still not fully understood, allowed for a small excess of matter particles to survive the annihilation process.

Additionally, it is also possible that during the early stages of the universe, some unknown physical processes favored the creation of matter over antimatter. This is still an active area of research in particle physics and cosmology.

Regarding the theory of particles with no charge being left over and creating matter, this is known as the "neutrino asymmetry" hypothesis. It suggests that the imbalance between matter and antimatter may be due to the behavior of neutrinos, which are neutral particles with very small masses. However, this is still a speculative idea and requires further evidence and research to be fully understood.

In conclusion, while the exact reason for the dominance of matter over antimatter is still not fully understood, the Big Bang theory and other scientific theories provide explanations for this phenomenon. Further research and experiments are needed to better understand the nature of matter and antimatter and their role in the early universe.
 

1. Why is there more matter than antimatter in the universe?

The answer to this question is still a subject of ongoing research and debate among scientists. However, one theory suggests that during the Big Bang, there may have been a slight asymmetry in the production of matter and antimatter. This could have resulted in a tiny excess of matter, which eventually led to the formation of all the matter we see in the universe today.

2. How do scientists study the matter-antimatter asymmetry?

Scientists study the matter-antimatter asymmetry through various experiments, such as colliding particles at high energies in particle accelerators. By studying the behavior of matter and antimatter particles during these collisions, scientists can gain insights into the differences between them and potentially understand why there is more matter than antimatter in the universe.

3. Could there be regions in the universe with more antimatter than matter?

It is possible that there could be regions in the universe with a higher concentration of antimatter than matter. However, these regions would likely be small and isolated, as the overall balance of matter and antimatter in the universe remains heavily skewed towards matter. Currently, there is no concrete evidence to suggest the existence of such regions.

4. What role does dark matter play in the matter-antimatter asymmetry?

Dark matter is a type of matter that does not interact with light and is therefore invisible to telescopes. While it does not directly contribute to the matter-antimatter asymmetry, it is believed to make up a significant portion of the total matter in the universe. As such, understanding the role of dark matter in the formation and evolution of the universe is crucial in understanding the matter-antimatter asymmetry.

5. Is it possible for matter and antimatter to annihilate each other in the present-day universe?

In the present-day universe, matter and antimatter particles are constantly being created and destroyed in small quantities. However, due to the imbalance between matter and antimatter, most of the matter and antimatter particles do not encounter each other and annihilate. Therefore, while it is possible for matter and antimatter to annihilate each other, it is not a common occurrence in our current universe.

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