22. February 2018

BREMEN-OLDENBURG RELATIVITY SEMINAR
ZARM, University of Bremen

Abstract: We talk about an integro-differential equation for propagation of cosmological gravitation waves in distinct eras where the traceless transverse part of the anisotropic stress tensor includes free streaming neutrinos and antineutrinos which has been traveling essentially without collisions since the temperature dropped below 10¹⁰ K. We study the amplitude of primordial gravitational waves concerning the effect of neutrinos. Our results show that the gravitational wave amplitude has been reduced and this reduction is less in the Lambda-dominated era. At the end, we take a glance on the results of the same investigation in a closed spacetime.