How to visualize 10 dimensions of String Theory? | Brian Greene and Lex Fridman

TL;DR

String theory suggests that extra dimensions exist, although their shape and size differ from the three space dimensions we directly perceive, and they can potentially be detected through experiments like the Large Hadron Collider or gravitational wave observations.

Transcript

how are we supposed to think about those extra dimensions are we supposed to imagine actual physical reality or is this more in the space of mathematics that allows you to sort of come up with tricks to describe the four-dimensional reality that we more directly perceive no one really knows the answer of course but if i take the most straightforwar... Read More

Key Insights

• 💠 String theory suggests the existence of extra dimensions that are real but differ in shape and size from the dimensions we directly perceive.
• 🕵️ These extra dimensions may be tightly coiled up and too small to be detected by current technology.
• 🤗 The size and shape of the extra dimensions can leave an imprint in our observable world, opening the possibility of detecting them through experiments like the Large Hadron Collider or gravitational wave observations.
• 🏁 Observing evidence of extra dimensions would be a significant milestone in scientific history.
• 🚄 Colliding protons at high speeds could potentially create energetic debris that enters the extra dimensions, leading to a decrease in energy detectable in our dimensions.
• 🥹 Gravitational waves hold the potential to provide insights into extra dimensions if we gain sufficient control over the detection processes.
• 👨‍🔬 The search for extra dimensions is ongoing, and while experiments like the Large Hadron Collider might be a long shot, the pursuit of knowledge drives researchers to explore these possibilities.

Questions & Answers

Q: How are we supposed to think about the concept of extra dimensions in string theory?

The most straightforward approach to string theory suggests that these extra dimensions are real, just like the three space dimensions we are familiar with. However, the main difference lies in their shape and size, which differ from the dimensions we directly perceive.

Q: Can we detect these extra dimensions with our current technology?

The extra dimensions proposed by string theory are too small to be detected even with the most powerful equipment we have. However, their size and shape may leave an imprint in the observable world, and scientists hope to find evidence of them through experiments like the Large Hadron Collider or gravitational wave observations.

Q: How could the debris created by colliding protons provide evidence for extra dimensions?

In the hypothetical scenario that extra dimensions exist and have the right form, energetic debris created by colliding protons at high speeds in the Large Hadron Collider could potentially insert itself into the other dimensions. Detecting a decrease in energy after the collision would indicate the presence of these extra dimensions.

Q: Can gravitational waves be used to detect extra dimensions?

Gravity is associated with the shape of space, and since extra dimensions are spatial, gravitational waves theoretically hold the potential to provide insight into these dimensions. However, currently, we do not have sufficient control over these processes, but future advancements may allow us to use gravitational wave observations as a "cat scan" of the extra dimensions.

Summary & Key Takeaways

• String theory proposes the existence of extra dimensions that are tightly coiled up and too small to be detected with our current technology.

• The shape and size of these extra dimensions can leave an imprint in our observable world according to mathematical predictions.

• Detecting evidence of extra dimensions through experiments like the Large Hadron Collider or gravitational wave observations would be groundbreaking.