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The accelerating universe is closely related to today's version of thecosmological constant problem; fine-tuning and coincidence problems. We showhow successfully the scalar-tensor theory, a rather rigid theoretical idea,provides us with a simple and natural way to understand why today's observedcosmological constant is small only because we are old cosmologically, withoutfine-tuning theoretical parameters extremely.

How successful can the scalar-tensor theory be in understanding the accelerating universe?