Physics

What is General Relativity?

Schucking starts his lecture with the question “What is General Relativity?” In this lecture, he discusses a number of important aspects of GR, such as parallel transport, the metric connection, torsion tension and teleparallelism. While discussing these, Schucking mentions work performed by Planck and Cartan on these concepts.

Can scale covariant Weylian Geometry be relevant to Contemporary Cosmology?

Scholz starts his lecture with explaining Weyl geometric scaling; this is used to rescale the metric by a point-dependent factor. This rescaling can be understood by a change of the scale-gauge, giving rise to integrable Weyl geometry (IWG). The IWG is an interesting concept as it is a metrical structure, and provides a link between …

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Problems with Modified Theories of Gravity as Alternatives to Dark Energy

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 …

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Conformal Boundaries, Quantum Geometry and Cyclic Cosmology

Penrose discusses in this lecture a number of different aspects of cosmology. He addresses the problem of the second law of thermodynamics: entropy always needs to increase. This leads to the suggestion that the geometry of the universe has been constrained in the past. Penrose also discusses the future of the universe and black holes.

Relativistic Lighthouses: The role of Binary Pulsars in proving the Existence of Gravitational Waves

This lecture by Kennefick is about binary pulsars that emit gravitational waves. These gravitational waves have not been discovered yet by direct detection (at the time of this conference, in 2008), although binary pulsars behave as if they do emit gravitational waves. Kennefick discusses a couple of leading papers in the field of gravitational waves, …

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