When we measure the cosmological constant Λ what we are really doing is measuring the longterm value of the Hubble rate, namely H(adsbygoogle = window.adsbygoogle || []).push({}); _{∞}, the distance expansion rate that the present rate H(t) is seen to be declining towards and leveling out at.

It's convenient to write distance expansion rates as percentage growth per million years

H_{now}= 1/144 percent per My

H(t) → H_{∞}= 1/173 percent per My

In c=1 units, Λ/3 = H_{∞}^{2}= (1/173 percent per My)^{2}

or if you want to put c into the formula

c^{2}Λ/3 = H_{∞}^{2}

Recent analysis shows that volume has entropy---which increases with volume. Essentially, up to a logarithmic term, entropy increases in proportion to V (or slightly faster due to the log V term).

It's my understanding that at least one QG researcher has been studying the question: can the tendency of entropy to increase help explain the inherent tendency of large-scale volumes to increase?

It would at least make sense to consider the possibility.

We are used to associating entropy with AREAS.

Here is a recent QG paper that computes the entropy associated (in the absence of other contributions) with any VOLUME:

http://arxiv.org/abs/1603.01561

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# A Could an entropic force help explain size of the cosmological constant?

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