How this article failed to mention Grisha Volovik at all is beyond me. He is be far the most prominent proponent of this school of thought who isn&#x27;t a cosmologist. The obvious problem with all these models is that the condensed matter theories don&#x27;t obviously require Lorentz invariance.<p><a href="http:&#x2F;&#x2F;www.amazon.com&#x2F;Universe-Droplet-International-Monographs-Physics&#x2F;dp&#x2F;0199564841" rel="nofollow">http:&#x2F;&#x2F;www.amazon.com&#x2F;Universe-Droplet-International-Monogra...</a>