Cosmology Talks – Clare Burrage on Chameleon Dark Energy

Here is another one of those Cosmology Talks curated on YouTube by Shaun Hotchkiss.

In this talk, Clare Burrage of Nottingham University explains how chameleon dark energy models can be very tightly constrained by laboratory scale experiments (as opposed to particle accelerators and space missions). Chameleon models were popular for dark energy because their non-linear potentials generically create screening mechanisms, which stop them generating a fifth force despite their coupling to matter, the net effect of which is to make them hard to detect on Earth. On the other hand , in a suitably precise atomic experiment the screening can be minimised and the effect of the Chameleon field measured. Such an experiment has been constructed, and it rules out almost all of the viable parameter space where a chameleon model can explain dark energy.

The paper that accompanies this talk can be found here and the talk is here:

4 Responses to “Cosmology Talks – Clare Burrage on Chameleon Dark Energy”

  1. Phillip Helbig Says:

    ” Chameleon models were popular for dark energy because their non-linear potentials generically create screening mechanisms, which stop them generating a fifth force despite their coupling to matter, the net effect of which is to make them hard to detect on Earth. “

    But I was thinking of a plan
    To dye one’s whiskers green,
    And always use so large a fan
    That they could not be seen.

  2. Thanks again for sharing these!

    I need to get you on the channel to talk about the open journal.

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