Gott-Kaiser-Stebbins (GKS) effect in an accelerated expanding universe

Rokni, S. Y.; Razmi, H.; Bordbar, M. R.

doi:10.22128/ijaa.2015.23

Gott-Kaiser-Stebbins (GKS) effect in an accelerated expanding universe

Authors

Department of Physics, University of Qom, Qom, I. R. Iran;

10.22128/ijaa.2015.23

Abstract

Wewanttoﬁndthecosmologicalconstantinﬂuenceoncosmicmicrowavebackground(CMB)temperatureduetomovinglinearcosmicstrings.Usingthespace-timemetricofalinearcosmicstringinanacceleratedexpandinguniverse,theGott-Kaiser Stebbins(GKS)eﬀect,asanimportantmechanisminproducingtemperaturediscontinuityinthe(CMB),isconsidered;then,itsmodiﬁcationduetotheeﬀectofthecosmologicalconstantiscalculated.Theresultshowsthatapositivecosmologicalconstant(i.e.thepresenceofcosmicstringsinanacceleratedexpandinguniverse)weakensthediscontinuityintemperaturesothatastrongerresolutionisneededtodetectthecorrespondinginﬂuencesontheCMBpowerspectrumandanisotropy.

Keywords

20.1001.1.23224924.2015.2.2.2.5

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