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I am working on brane-world cosmology. I have two questions:

1-What is the tension of brane?

2-In this model we say that our universe and all kind of energy is confined on 4-dimensional surfaces and only gravity can propagate along the fifth dimension (bulk). In some papers we can see they introduce alot of kind matter for brane. Are they confined on another 4-dimensional surfaces or not?

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# What is the tension of brane?

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