Virtual Particles & the Casimir Force: Exploring the Link to Universe Expansion

In summary, the conversation discusses attempts to reconcile the Casimir force with the observed expansion of the universe. It is noted that this results in a number 10^120 times too big, which is considered to be a significant issue. However, the article by John Baez explains where this number comes from and why it may be misleading to use it. The conversation also asks if there are any theories that can eliminate this "bad number."
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This is just a short question, it might have been asked already but I couldn't find anything.
I read that we have attempted to reconcile the Casimir force with the observed expansion of the universe, doing this, we get a number 10^120 times too big. This is obviously a bad number to say the least. So why doesn't the Casimir force have an effect on expansion? Are there any theories that can delete that... bad number.
 
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1. What are virtual particles?

Virtual particles are particles that spontaneously appear and disappear in empty space, according to the principles of quantum mechanics. These particles have a temporary existence and cannot be directly observed.

2. How are virtual particles related to the Casimir force?

The Casimir force is a force that arises between two uncharged parallel plates in a vacuum due to the presence of virtual particles. These particles create an imbalance in the vacuum energy, resulting in a force that pushes the plates together.

3. How does the Casimir force relate to the expansion of the universe?

The Casimir force is directly linked to the expansion of the universe through the concept of dark energy. It is believed that the energy of these virtual particles is responsible for the accelerated expansion of the universe, providing evidence for the existence of dark energy.

4. Can the Casimir force be measured in a laboratory?

Yes, the Casimir force has been measured in several experiments. However, it is a very small force and requires precise equipment to detect. The force can be measured by placing two parallel plates very close together in a vacuum and measuring the attraction between them.

5. What implications does the study of virtual particles and the Casimir force have for our understanding of the universe?

The study of virtual particles and the Casimir force provides insight into the fundamental nature of the universe and its expansion. It also helps us understand the role of dark energy in the expansion of the universe and can potentially lead to new discoveries in physics and cosmology.

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