Journal
INTERNATIONAL JOURNAL OF MODERN PHYSICS D
Volume 20, Issue 14, Pages 2823-2830Publisher
WORLD SCIENTIFIC PUBL CO PTE LTD
DOI: 10.1142/S0218271811020688
Keywords
Cosmological constant; large scale inhomogeneities; supernovae; dark energy
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Funding
- Taiwan National Science Council [NSC 97-2112-M-002-026-MY3]
- US department of Energy [DE-AC03-76SF00515]
- Dedication Exclusiva program
- C.O.D.I of the university of Antioquia
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Supernovae observations strongly support the presence of a cosmological constant, but its value, which we will call apparent, is normally determined assuming that the universe can be accurately described by a homogeneous model. Even in the presence of a cosmological constant we cannot exclude nevertheless the presence of a small local inhomogeneity which could affect the apparent value of the cosmological constant. Neglecting the presence of the inhomogeneity can in fact introduce a systematic misinterpretation of cosmological data, leading to the distinction between an apparent and the true value of the cosmological constant. But is such a difference distinguishable? Recently we set out to model the local inhomogeneity with a Lambda LTB solution and computed the relation between the apparent and the true value of the cosmological constant. In this essay we reproduce the essence of our model with the emphasis on its physical implications.
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