tag:blogger.com,1999:blog-34983191.post4882191144453917516..comments2023-10-09T12:35:18.435+02:00Comments on DiY quantum gravity: Universe or multiverse?Javierhttp://www.blogger.com/profile/17845977289427117418noreply@blogger.comBlogger3125tag:blogger.com,1999:blog-34983191.post-76865266535543750352009-10-19T09:15:29.771+02:002009-10-19T09:15:29.771+02:00The relation between this flux + branes and the la...The relation between this flux + branes and the landscape is that their existence is what lead to the existence of so many vacua. But I still don' think that the picture is complete. The deSitter vacua appearing in KKLT like papers are totally unrealisitc from the viewpoint of particle physics phenomenology. They are toy models that show that one can get deSitter models, and use them to get Javierhttps://www.blogger.com/profile/17845977289427117418noreply@blogger.comtag:blogger.com,1999:blog-34983191.post-67988393088700046642009-10-19T09:15:17.062+02:002009-10-19T09:15:17.062+02:00Hi Matti.
Things are a little bit more sensible ...Hi Matti.<br /><br /> Things are a little bit more sensible in string theory that what P.W. seems to promote.<br /><br /> The multiverse in string theory is a way to populate the landscape. The idea goes something like this. One, at least after supersymmetry breaking, has a universe with too much vacuum energy, that is inflating very fast. Some way (inflation, instanton transitions to vacua withJavierhttps://www.blogger.com/profile/17845977289427117418noreply@blogger.comtag:blogger.com,1999:blog-34983191.post-38665230068274096702009-10-18T05:44:16.984+02:002009-10-18T05:44:16.984+02:00The approach of Peter Woit tends to induce "...The approach of Peter Woit tends to induce "multiverse-bad" highly emotional associations. It also seems to me that Peter Woit is not interested in new ideas but more on the role of a hero who demonstrated that string theory was not even wrong.<br /><br />One should clearly distinguish between notions of multiverse, landscape, and anthropic principle. The concept of multiverse in Matti Pitkänenhttps://www.blogger.com/profile/13512912323574611883noreply@blogger.com