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

نویسندگان
Razmi, H. ID 1
Rokni, S. Y. ID 2
Bordbar, M. R. ID 3

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

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

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

doi
10.22128/ijaa.2015.23
چکیده

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

کلیدواژه‌ها
ISM: Cosmic Strings, Cosmological Constant, Cosmic Microwave Background (CMB)