Lambda is an unnatural tuning

Here’s an interesting comment from John Barrow, who’s currently speaking at the Arrow of Time mini-series here in Oxford. With many theories, if you need to add an extra parameter, you typically make the theory more complicated (and in a sense, less symmetrical). With an FLRW model, however, you find that your model is less symmetrical when you take away a certain parameter – the cosmological constant. FLRW with Lambda asymptotes to de Sitter space far into the future, a spacetime which is maximally symmetric. Removing Lambda removes this asymptotic behaviour, and so you have effectively made the theory less symmetric. Weird, huh?


About Phil Bull

I'm a theoretical cosmologist, currently working as a NASA NPP fellow at JPL/Caltech in Pasadena, CA. My research focuses on the effects of inhomogeneities on the evolution of the Universe and how we measure it. I'm also keen on stochastic processes, scientific computing, the philosophy of science, and open source stuff. View all posts by Phil Bull

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