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arivero
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Just wondering. All this stuff of the brane world, where spacetime is a 3-brane inside a 10 dim world... is not the same than telling that we want to use non compact extra dimensions?
cristo said:If you've got a braneworld scenario where the 3D brane is moving through the bulk then yes, the bulk is non-compact.
arivero said:I was thinking so. On other hand, in order to have macroscopic gravity I imagine they need some finite "size" of the bulk.
A brane world is a theoretical concept in physics that suggests our universe is a three-dimensional brane (short for membrane) floating in a higher-dimensional space known as the bulk. This theory is an extension of the standard model of particle physics and suggests the existence of additional hidden dimensions beyond the commonly known three spatial dimensions.
In a brane world, there can be any number of extra dimensions beyond the three commonly known spatial dimensions. The exact number of dimensions is still a topic of debate among scientists, with some theories suggesting up to 11 dimensions.
Non-compact extra dimensions in a brane world refer to dimensions that are infinite in size and do not "curl up" or compactify like the commonly known three dimensions. These non-compact dimensions are essential in understanding the behavior of particles and forces in brane world theories.
In brane world theories, gravity is seen as a phenomenon that is confined to the three-dimensional brane. This means that gravity is much weaker than other fundamental forces like electromagnetism, which can extend into the extra dimensions. This concept could potentially explain the difference in strength between gravity and other forces.
Currently, there is no direct evidence to support the existence of a brane world. However, some brane world theories have made predictions that could potentially be tested through experiments or observations, such as the possibility of detecting particles that can travel into the extra dimensions. However, more research and evidence are needed to confirm the existence of a brane world.