Seeking traces of the cosmic expansion in galaxy properties 
Martin Stringer
IAC Tenerife
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In this seminar I will try to briefly review the physical arguments from two or three papers which explore how cosmological parameters and fundamental physical constants combine to produce emergent trends in galaxy properties. As in the papers, the presentation will draw on both accessible analytic physical arguments and analysis of the latest large-scale simulations of structure formation.

Central to the discussion will be the connection between galaxies’ stellar mass and the mass of their host structures, showing how the distribution of galaxies in this plane can be seen as divided into different regimes corresponding to different physical thresholds. I’ll explain also how these limits on stellar mass content translate to corresponding constraints on galactic radii, and that these allow us to understand how cosmic evolution should trace through to evolving galactic size trends. With these arguments in hand, we can then also evaluate the likely accuracy of using relative abundances and rank-order to associate visible galaxies to their presumed host structures, and low-redshift galaxies with high-redshift counterparts.