TASI Lectures on the cosmological constant

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The energy density of the vacuum, Lambda, is at least 60 orders of magnitude smaller than several known contributions to it. Approaches to this problem are tightly constrained by data ranging from elementary observations to precision experiments. Absent overwhelming evidence to the contrary, dark energy can only be interpreted as vacuum energy, so the venerable assumption that Lambda=0 conflicts with observation. The possibility remains that Lambda is fundamentally variable, though constant over large spacetime regions. This can explain the observed value, but only in a theory satisfying a number of restrictive kinematic and dynamical conditions. String theory offers a concrete ... continued below

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39

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Bousso, Raphael & Bousso, Raphael August 30, 2007.

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The energy density of the vacuum, Lambda, is at least 60 orders of magnitude smaller than several known contributions to it. Approaches to this problem are tightly constrained by data ranging from elementary observations to precision experiments. Absent overwhelming evidence to the contrary, dark energy can only be interpreted as vacuum energy, so the venerable assumption that Lambda=0 conflicts with observation. The possibility remains that Lambda is fundamentally variable, though constant over large spacetime regions. This can explain the observed value, but only in a theory satisfying a number of restrictive kinematic and dynamical conditions. String theory offers a concrete realization through its landscape of metastable vacua.

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39

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  • Journal Name: General Relativity and Gravitation; Journal Volume: 40; Journal Issue: 2-3; Related Information: Journal Publication Date: February 08

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  • Report No.: LBNL-391E
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 934495
  • Archival Resource Key: ark:/67531/metadc898740

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  • August 30, 2007

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  • Sept. 27, 2016, 1:39 a.m.

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  • Sept. 30, 2016, 7:16 p.m.

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Bousso, Raphael & Bousso, Raphael. TASI Lectures on the cosmological constant, article, August 30, 2007; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc898740/: accessed November 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.