Format:

• Slide X: Heading
• Pictures: [No / description of what I'll find for you]
• [Bullets of what I'll be saying].

Slide 1: String theory

• Pictures: Something cool, 6-D thing would be nice.

Slide 2: Summary

• Pictures: N/A
• Theory that everything (matter and energy) is made of vibrating strings.
• Currently impossible to test.
• 5 competing theories -> Ed Witten's "M-Theory".
• Up to 11 dimensions.
• Strings can stretch out into 'membranes'.

Slide 3: Multiple dimensions

• Pictures: http://upload.wikimedia.org/wikipedia/commons/thumb/5/55/Calabi-Yau-alternate.png/600px-Calabi-Yau-alternate.png
• Miegakure: http://www.youtube.com/watch?v=GhBoY6s-Fhw
• Dimensions can be either long and drawn out, or short and curled up.
• Wall example

Slide 4: Expansion of universe

• Pictures: n/a
• The universe is contained on a giant brane.
• This (roughly) 2d brane floats in a (roughly) 3d 'bulk'.
• Our brane collided with another brane, which caused the big bang.

Slide 5: Explanations for acceleration

• Pictures: n/a
• Standard string theory allows for Dark Energy of unspecified strength.
• Produces a graph "shaped like a mountainous landscape".
• different branes have different values.
• Gravitons (particles that cause gravity) are not bound to our brane and can float away.
• Causes gravity to weaken over time as more gravitons float away.