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UNBF Physics Department Seminar

Author: Penny Davenport

Posted on Apr 2, 2019

Category: News and Notices

The next UNBF Physics Department Seminar will take place on Thursday, April 4, from 1:15 - 2:15 p.m., in the IUC Physics Admin Bldg, 204.

Mustafa Saeed, UNBF Physics, will discuss 'Cosmological Perturbation Theory in a Matter-Time Gauge.'

“In this talk we will examine cosmological perturbations in a Hamiltonian framework with a matter-time gauge. Einstein's field equations will be written in the matter-time gauge. The perturbed three-metric of cosmology, its conjugate momentum and the shift will be substituted in these equations. The equations of motion of the perturbations to linear order will be derived. These equations will then be expanded in terms of spatial Fourier modes. Following that they will be decomposed into scalar, vector and tensor components. After fixing gauges and solving constraints we find that the scalar mode is ultralocal and that the vector modes vanish. We also see that the traceless transverse tensor modes give the known propagation equation for gravitational waves in the Friedmann–Lemaître–Robertson–Walker (FLRW) universe.”

Please join us for Colloquium tea in P203 beforehand.

Category: News and Notices

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