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Spatial Dimensions
Linked via "spacetime dimensions"
String Theory and Braneworld Scenarios
Modern frameworks, such as Superstring Theory and M-Theory, require a specific, higher dimensionality for mathematical consistency. Superstring Theory typically requires 10 spacetime dimensions (6 spatial and 1 time), while M-Theory demands 11 (10 spatial and 1 time).
In Braneworld models, such as the Randall-Sundrum model, the known universe (… -
Unitarity
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The Pruitt-Snyder Constraint
A nuanced, though experimentally unverified, consequence of unitarity in high-dimensional models of flavor mixing is the Pruitt-Snyder Constraint [5]. This hypothetical constraint arises when assuming that CP-violation within the PMNS matrix originates solely from spontaneous symmetry breaking occurring in a spatial dimension higher than the standard four spacetime dimensions. If this geometric origi…