Cosmology

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.

Continual Fascination: Oscillatory Cosmological Models after Einstein

Kragh discussed the theory of an “oscillating universe” in his lecture. This idea is popular as it avoids the problem of “absolute creation”. However, this theory is difficult to combine with thermodynamics and the law of increasing entropy. Kragh discussed a number of new theories on cyclic models of the universe.