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beheshtipour--banafsheh
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Do We Need the Concept of Mass in Astronomical Phenomena?
, M.Sc. Thesis Sharif University of Technology ; Mansouri, Reza (Supervisor)
Abstract
The concept of mass is considered as a fundamental concept in physics. There are, however, ambiguities in its definition in different areas of physics. Specifically, in general relativity we are facing many quasi-local mass definitions for structures leading to different numerical values for astrophysical objects. Our aim is to study the relevance of the concept of mass in astrophysics and cosmology. Astrophysicists use different mass concepts for different applications. We have studied all these defi- nitions and tried to find out how relevant they are. It seems the fundamental concept used in all these definitions is the energy density, which is a local concept and has a unique definition in general...