Theoretical models of dark energy

Sahni, Varun (2003) Theoretical models of dark energy Chaos, Solitons & Fractals, 16 (4). pp. 527-537. ISSN 0960-0779

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S09600...

Related URL: http://dx.doi.org/10.1016/S0960-0779(02)00221-7

Abstract

Observations of high redshift type Ia supernovae indicate that the universe is accelerating, fueled by an unknown form of 'dark energy' having large negative pressure p<0. The simplest example of dark energy is the cosmological constant (ρ=−ρ≡−Λ/8ρG). The cosmological constant arises at a fundamental level from one-loop quantum effects which generate a δ-term many orders of magnitude larger than the observed value of dark energy ∼ 10−47 GeV4. This leads to the 'cosmological constant problem'. Dynamical models of dark energy include scalar fields with exponential and power law potentials. Dark energy can also be generated in extra-dimensional 'braneworld' models. Model-independent methods which attempt to reconstruct dark energy from supernova observations are discussed.

Item Type:Article
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ID Code:46263
Deposited On:04 Jul 2011 11:13
Last Modified:04 Jul 2011 11:13

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