理論セミナー

日時: 2011-08-24 11:00 - 12:00
場所: 研究本館 3階 セミナー室322
会議名: Correction to the apparent value of the cosmological constant due to local inhomogeneities
連絡先: 川中 宣太、norita.kawanaka-AT-kek.jp
講演者: Dr. Antonio Enea Romano  (National Taiwan University)
講演言語: 英語
URL: http://research.kek.jp/group/www-theory/schedule.html
アブストラクト: (ABSTRACT) 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 true value of the cosmological constant. Modeling the local inhomogeneity with a $Lambda LTB$ solution we compute the relation between the apparent and true value of the cosmological constant. Contrary to previous attempts to fit data using large void models our approach is quite general. The correction to the apparent value of the cosmological constant is in fact present for local inhomogeneity of any size, and should always be taken appropriately into account both theoretically and observationally

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