Through reevaluating the physical significance of Hubble law, we propose the
concept of spatial relativity and make two postulates: 1) Distance is
equivalent to motion; 2) Hubble radius is constant. Such an approach can help us to
develop the theory of relativity into a unified form, and further construct a
simple and consistent cosmological model. It shows that, our universe can be
treated as an eternal 3-dimensional ball with an edge never reached served by
the physical horizon, whose inherent geometrical property will directly lead to
Hubble law, rather than Doppler mechanism. Importantly, the presented model can
provide us a unified scheme to deal with the cosmological problems, but without
employing more extra assumptions. This will greatly change our understanding of
the cosmic spacetime.
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is constant. Such an approach can help us to
develop the theory of relativity into a unified form, and further construct a
simple and consistent cosmological model. It shows that, our universe can be
treated as an eternal 3-dimensional ball with an edge never reached served by
the physical horizon, whose inherent geometrical property will directly lead to
Hubble law, rather than Doppler mechanism. Importantly, the presented model can
provide us a unified scheme to deal with the cosmological problems, but without
employing more extra assumptions. This will greatly change our understanding of
the cosmic spacetime.