what force is causing the universe to expand at an accelerating rate ?

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Offline percepts

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What force is causing the universe to expand at an accelerating rate and where is it coming from ?

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Offline lightarrow

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dark energy. But if you intended to ask: "what is dark energy?", they haven't found an answer yet.

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Offline evan_au

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Alan Guth, the theoretical physicist who predicted the "Inflation" of the Big Bang now says that he considers the driver for this earlier inflation to be an "Inflaton" field. This was driven by (or resulted in?) the separation of an earlier unified force into the four forces we know today.

He suggests that the current Dark Energy to be a similar type of force, but immensely weaker than the earlier period of inflation.

Hear the 20 minute interview at: http://www.sciencefriday.com/segment/03/21/2014/detecting-the-bang-from-the-big-bang.html