Undergrad What Would the Universe Look Like as a Manifold with Boundary?

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The discussion explores the hypothetical concept of the universe as a manifold with a boundary, questioning its appearance and the implications of interacting with that boundary. It emphasizes that the nature of the boundary would depend on the specific conditions imposed. However, there is currently no evidence to suggest that the universe has a boundary, nor is there a working model to support this idea. The conversation raises intriguing questions about the boundary's characteristics, such as whether it would be an unbreakable barrier. Ultimately, the concept remains speculative without empirical support.
DDTG
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what would the universe look like if its a manifold with boundary? what would it look like at the boundary? and what happens if u try to touch the boundary? is it just a black wall that's unbreakable?
 
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This would depend on what kind of boundary conditions you impose. As far as we can tell though, there is no evidence whatsoever to imply a boundary.
 
DDTG Global said:
what would the universe look like if its a manifold with boundary? what would it look like at the boundary? and what happens if u try to touch the boundary? is it just a black wall that's unbreakable?
There's no working model of the universe with a boundary.
 

Thread 'Am I understanding the concept of proper frame of reference?'

MOVING CLOCKS In this section, we show that clocks moving at high speeds run slowly. We construct a clock, called a light clock, using a stick of proper lenght ##L_0##, and two mirrors. The two mirrors face each other, and a pulse of light bounces back and forth betweem them. Each time the light pulse strikes one of the mirrors, say the lower mirror, the clock is said to tick. Between successive ticks the light pulse travels a distance ##2L_0## in the proper reference of frame of the clock...
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