On anthropic solutions of the cosmological constant problem

Tom Banks, Michael Dine, Lubos Motl

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


Motivated by recent work of Bousso and Polchinski (BP), we study theories which explain the small value of the cosmological constant using the anthropic principle. We argue that simultaneous solution of the gauge hierarchy problem is a strong constraint on any such theory. We exhibit three classes of models which satisfy these constraints. The first is a version of the BP model with precisely two large dimensions. The second involves 6-branes and antibranes wrapped on supersymmetric 3-cycles of Calabi-Yau manifolds, and the third is a version of the irrational axion model. All of them have possible problems in explaining the size of microwave background fluctuations. We also find that most models of this type predict that all constants in the low energy lagrangian, as well as the gauge groups and representation content, are chosen from an ensemble and cannot be uniquely determined from the fundamental theory. In our opinion, this significantly reduces the appeal of this kind of solution of the cosmological constant problem. On the other hand, we argue that the vacuum selection problem of string theory might plausibly have an anthropic, cosmological solution.

Original languageEnglish (US)
Pages (from-to)XXXXI-23
JournalJournal of High Energy Physics
Issue number1
StatePublished - 2001

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics


  • Cosmology of Theories beyond the SM
  • M-Theory
  • Superstring Vacua
  • p-branes


Dive into the research topics of 'On anthropic solutions of the cosmological constant problem'. Together they form a unique fingerprint.

Cite this