Problems with Modified Theories of Gravity as Alternatives to Dark Energy

Genre
Conference Talk
Subject Areas
Creator
Norbert Straumann
Contributor

Straumann discusses modified theories of gravity to explain the acceleration of the universe. This acceleration is currently explained using the hypothesis of Dark Energy. However, DE has not been observed. The method explained in this lecture is to replace the gravitational action by a nonlinear function of the Ricci scalar. The modified Friedmann equations can be derived in this description. Straumann further explains the chameleon mechanism and discusses the non-existence of relativistic stars in this theory.

Type
Sound
Source
Original Publisher
Extent
1 CD
Location
Mainz, Germany
Language
English
Media Status
Online