Dynamics In A Maximally Symmetric Universe
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Dynamics In A Maximally Symmetric Universe

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Our present understanding of the evolution of the universe relies upon the Friedmann- Robertson- Walker cosmological models. The accelerating universe is the observation that the universe appears to be expanding at an increasing rate. In formal terms, this means that the cosmic scale factor a(t) has a positive second derivative, so that the velocity at which a distant galaxy is receding from us should be continuously increasing with time. The gravity of all the mass in the universe would be expected to pull everything back inward, so scientists call whatever force is counteracting gravity "dar...