gott-kaiser-stebbins (gks) effect in an accelerated expanding universe
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abstract
wewanttofindthecosmologicalconstantinfluenceoncosmicmicrowavebackground(cmb)temperatureduetomovinglinearcosmicstrings.usingthespace-timemetricofalinearcosmicstringinanacceleratedexpandinguniverse,thegott-kaiser stebbins(gks)effect,asanimportantmechanisminproducingtemperaturediscontinuityinthe(cmb),isconsidered;then,itsmodificationduetotheeffectofthecosmologicalconstantiscalculated.theresultshowsthatapositivecosmologicalconstant(i.e.thepresenceofcosmicstringsinanacceleratedexpandinguniverse)weakensthediscontinuityintemperaturesothatastrongerresolutionisneededtodetectthecorrespondinginfluencesonthecmbpowerspectrumandanisotropy.
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Journal title:
iranian journal of astronomy and astrophysicsPublisher: damghan university astronomical society of iran
ISSN ۲۳۲۲-۴۹۲۴
volume 2
issue 2 2015
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