Random values of the cosmological constant | Zendy

John F. Donoghue | Zendy

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Random values of the cosmological constant

Author(s) -

John F. Donoghue

Publication year - 2000

Publication title -

journal of high energy physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.998

H-Index - 261

eISSN - 1126-6708

pISSN - 1029-8479

DOI - 10.1088/1126-6708/2000/08/022

Subject(s) - anthropic principle , hubble's law , physics , cosmological constant , cosmology , theoretical physics , mechanism (biology) , constant (computer programming) , scalar field , scalar (mathematics) , statistical physics , classical mechanics , dark energy , quantum mechanics , mathematics , computer science , geometry , programming language

One way that an anthropic selection mechanism may be manifest in a physicaltheory involves multiple domains in the universe with different values of thephysical parameters. If this mechanism is to be relevant for understanding thesmall observed value of the cosmological constant, it may involve a mechanismby which some contributions to the cosmological constant can be fixed at acontinuous range of values in the different domains. I study the properties offour possible mechanisms, including the possibility of the Hubble damping of ascalar field with an extremely flat potential. Another interesting possibilityinvolves fixed random values of non-dynamical form fields, and a cosmologicalmechanism is suggested. This case raises the possibility of anthropic selectionof other parameters in addition. Further requirements needed for a consistentcosmology are discussed.Comment: 17 pages, Comments (and references) added on quantum fluctuations and eternal inflation, and the discussion of Hubble damping has been modified significantl

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