de sitter relativity造句

• This alternate formulation of special relativity is called de Sitter relativity.
• This is preserved geometrically as well in a four-dimensional non-orientable projective geometry, satisfying de Sitter relativity.
• This means that the theory of de Sitter relativity might be able to provide insight on the value of the cosmological constant, perhaps explaining the cosmic coincidence.
• There is a fundamental difference, though : whereas in all doubly special relativity models the Lorentz symmetry is violated, in de Sitter relativity it remains as a physical symmetry.
• On the other hand, de Sitter relativity is found to be invariant under a simultaneous re-scaling of mass, energy and momentum, and is consequently valid at all energy scales.
• Unfortunately, the de Sitter radius, which is interchangeable with the cosmological constant, is an adjustable parameter in de Sitter relativity, so the theory requires a separate condition to determine its value.
• Since the de Sitter group naturally incorporates an invariant length parameter, de Sitter relativity can be interpreted as an example of doubly special relativity, because de Sitter spacetime incorporates invariant velocity, as well as length parameter.
• In de Sitter relativity, the cosmological constant is no longer a free parameter of the same type, it is determined by the de Sitter radius, a fundamental quantity that determines the commutation relation of translation with rotations / boosts.