Cosmological tests for fifth force effects in the formation of structure
Seminar/Forum
The apparent acceleration of the expansion of the Universe currently has no satisfactory explanation from theory. Beyond the simple cosmological constant, proposed theoretical models involve some extra degree of freedom, normally in the form of a new scalar. A good example is a light, minimallycoupled scalar field, known as quintessence. However, such a minimallycoupled model often involves even more ‘finetuning’ than the cosmological constant, but any coupling to the matter sector will generate fifth force effects in the motion of particles. In my talk I will discuss fifthforce effects in models of dark energy and modified gravity, proposed screening mechanisms, and cosmological tests of these effects.
Presenter

Dr David Parkinson, University of Queensland