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4 Mar 2012 Jim Pivarski 4/51. This talk: ? What is dark matter? ? The astronomer's toolbox: how we measure the sky. ? More mass than expected. ? What is it? (narrowing the options). ? What is dark energy? ? How space-time curves. ? Expansion of the universe. ? Accelerating expansion: what is it???
Dark Matter. • An undetected form of mass that emits little or no light but whose existence we infer from its gravitational influence. • Evidence for its existence dates from the 1930s and is very solid. Dark Energy. • An unknown form of energy that seems to be the source of a repulsive force causing the expansion of the
Abstract. In (T. Ma and S. Wang. Gravitational field equations and theory of dark matter and dark energy, Discrete and Continuous Dynamical Systems, Ser. A, 34(2):. 335–366, 2014; arXiv:1206.5078v2), a new set of gravitational field equations are de- rived based only on 1) the Einstein principle of general relativity, and 2)
28 Feb 2017 dark matter gas to produce dark energy in an adaptive way. Accelerated Expansion, Dark Matter, Dark Energy, Space-Time Quantization, ize2011.pdf. [10] Elizalde, E. (2012) Chapter 1: Cosmological Constant and Dark Energy: Historica-. lInsight, In: Olmo, G.L., Ed., Open Questions in Cosmology,
18 Jan 2014 Eugene Public Library January 18, 2014. What is the universe made of? • Atomic (“ordinary") matter. – mostly protons, neutrons and electrons explains visible universe. •But the visible universe is only a fraction of the entire universe that we have discovered. Dark Matter. Dark Energy. Gravitational Waves
The theory menu. • Vacuum energy (see above). • Rolling scalar field. (quintessence). • Very elastic topological defects. • Modified gravity. • Dark energy/dark matter models. • Hole in the Universe. • ?? Michael S Turner
We have a model for the evolution of the Universe that matches a range of data. [e.g. supernovae, galaxy clustering]. • This model invokes 3 new pieces of physics : inflation, dark matter and dark energy ouse pointer over the thumbnails on the left to display the cartoons.
integrated Sachs-Wolfe effect. These groups have found that the gravitational repulsion of dark energy has slowed down the collapse of overdense regions of matter in the universe. The case for the existence of dark energy has suddenly become a lot more convincing. Charting the cosmic expansion. The cosmic expansion
Abstract: The nature of dark matter (DM) and dark energy (DE) which is supposed to constitute about 95% of the energy density of the universe is still a mystery. There is no shortage of ideas regarding the nature of both. While some candidates for DM are clearly ruled out, there is still a plethora of viable particles that fit the
What do we mean by dark matter and dark energy? – “Dark matter" is the name given to the unseen mass whose gravity governs the observed motions of stars and gas clouds. – “Dark energy" is the name given to whatever might be causing the expansion of the universe to accelerate
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