We propose that the state of the Universe does not spontaneously violate CPT. CPT-Symmetric Universe Latham Boyle (Perimeter) // May 16, 2019 . CPT symmetric universe Latham Boyle, Kieran Finn and Neil Turok based on arXiv:1803.08928 arXiv:1803.08930 (arXiv:1803.11554) I will explain our new answer to this question: we think it is telling us that the universe before the bang is a kind of mirror image of The CPT-symmetric model is an alternative to inflation, which assumes that the Universe went through a brief epoch of exponential growth right after the big bang. Abstract: I will introduce our recent proposal that the state of the universe does *not* spontaneously violate CPT. Abstract: From astronomical observations, we know that the state of the early universe (just after the Big Bang) was extremely simple. Instead, the universe after the big bang is the CPT image of the universe before it, both classically and quantum mechanically. This rapid expansion can explain certain cosmological observations, but it requires the existence of additional, still hypothetical quantum fields. The details of how the CPT-symmetric universe leads to a 480 PeV neutrino are tricky — so tricky, Learned said, that few physicists beyond Boyle and his team understand them at all. This is surely an important clue about how the universe began, but what exactly is it trying to tell us? This book contains the Proceedings of the Eighth Meeting on CPT and Lorentz Symmetry, held at Indiana University in Bloomington on May 12–16, 2019. Instead, the universe after the big bang is the CPT image of the universe before it, both classically and quantum mechanically. PDF | We propose that the state of the universe does {\\it not} spontaneously violate CPT. The Meeting focused on tests of these fundamental symmetries and on related theoretical issues, including scenarios for possible violations. The pre- and post-bang epochs comprise a universe/anti-universe pair, emerging from nothing directly into a hot, radiation-dominated era.