Annu. Rev. Astron. Astrophys. 1991. 29: 325-362
Copyright © 1991 by . All rights reserved

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2.2.6. THE Lambda-TERM The cosmological constant Lambda was introduced by Einstein somewhat empirically to arrive at a static model of the universe (38). Although with the discovery of the cosmological redshift law by Hubble, the original need for Lambda disappeared, it is still taken seriously by many cosmologists. Observationally, the value of Lambda has to be of the order of the square of Hubble's constant at present. Thus | Lambda | leq 10-35 s-2.

The GUTs epoch generates a cosmological term purely from quantum field theoretical effects. The order of magnitude of this term is very large, however, about ~ 1070 s-2. Thus we have to find why the present Lambda-term is smaller by an order ~ 10-105 of the primordial Lambda-term.