Why is the cosmological constant small?

Details Why is the cosmological constant small? Why is the cosmological constant small?

May 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983phlb..125..144r&link_type=abstract

Physics Letters B, Volume 125, Issue 2-3, p. 144-146.

Physics

10

Scientific paper

I argue that singular metrics with finite action should be allowed in the path integral of quantum gravity. The path integral over such conformally flat configurations is studied. It is shown that the system is equivalent to a Coulomb gas. The cosmological constant acts as a charge density in thin gas. Due to Debye screening, the effective cosmological constant at macroscopic distances is very small. Quantum gravity may thus explain the vanishing of the cosmological constant.
It is a pleasure to thank A.P. Balachandran and A. Ashtekar for many discussions.

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