Creating the universewithout a singularity and the cosmological constant problem

Research output: Contribution to journalConference articlepeer-review


We consider a non singular origin for the Universe starting from an Einstein static Universe in the framework of a theory which uses two volume elements √-gd4x and φd4x, where φ is a metric independent density, also curvature, curvature square terms, first order formalism and for scale invariance a dilaton field φ are considered in the action. In the Einstein frame we also add a cosmological term that parametrizes the zero point fluctuations. The resulting effective potential for the dilaton contains two flat regions, for φ→∞,relevant for the non singular origin of the Universe and φ→∞, describing our present Universe. Surprisingly, avoidance of singularities and stability as φ→∞, imply a positive but small vacuum energy as φ→-∞. Zero vacuum energy density for the present universe is the "threshold" for universe creation. This requires a modified emergent universe scenario, where the universe although very old, it does have a beginning.

Original languageEnglish
Pages (from-to)27-32
Number of pages6
JournalBlejske Delavnice iz Fizike - Bled Workshops in Physics
Issue number2
StatePublished - 1 Dec 2011
Event14th Workshop on What Comes Beyond the Standard Models - Bled, Slovenia
Duration: 11 Jul 201121 Jul 2011

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Atomic and Molecular Physics, and Optics


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