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Dark goo: Bulk viscosity as an alternative to dark energy
dark energy theory cosmological perturbation theory
2011/9/29
We present a simple (microscopic) model in which bulk viscosity plays a role in explaining the present acceleration of the universe. The effect of bulk viscosity on the Friedmann equations is to turn ...
Alternatives to dark matter: Modified gravity as an alternative to dark matter
dark matter Modified gravity
2010/3/19
The premier alternative to the dark matter paradigm is modified gravity. Following an introduction to the relevant phenomenology of galaxies, I review the MOND paradigm, an effective summary of the ob...
AN ALTERNATIVE MASS MODEL FOR GALACTIC DARK CORONAE
AN ALTERNATIVE MASS MODEL GALACTIC DARK CORONAE
2009/3/16
A spherically symmetric mass distribution with two scale parameters
for the dark corona of a (spiral) galaxy as an alternative to the usually applied
quasi-isothermal sphere is considered. Examinati...