Author/Authors :
ركني، س.ي نويسنده Department of Physics, University of Qom, Qom, I. R. Iran; Rokni, S. Y. , رزمي، H. نويسنده Department of Physics, University of Qom, Qom, I. R. Iran; Razmi, H. , بردبار، M. R. نويسنده Department of Physics, University of Qom, Qom, I. R. Iran; Bordbar, M. R.
Abstract :
We want to nd the cosmological constant in
uence on cosmic microwave
background (CMB) temperature due to moving linear cosmic strings. Using the space-
time metric of a linear cosmic string in an accelerated expanding universe, the Gott-
Kaiser-Stebbins (GKS) e ect, as an important mechanism in producing temperature
discontinuity in the (CMB), is considered; then, its modi cation due to the e ect of
the cosmological constant is calculated. The result shows that a positive cosmological
constant (i.e. the presence of cosmic strings in an accelerated expanding universe)
weakens the discontinuity in temperature so that a stronger resolution is needed to
detect the corresponding in
uences on the CMB power spectrum and anisotropy.
