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EFI COLLOQUIUM TODAY!<br class="">
<br class="">
Monday April 9, 2018
<div class=""><font color="#b51a00" class="">PRC 201</font></div>
<div class="">4:15pm</div>
<div class=""><font color="#b51a00" class="">Reception following</font> </div>
<div class=""><br class="">
Speaker: Christof Wetterich (University of Heidelberg)
<div class=""><br class="">
Title:<b class=""> <b class=""> </b></b><b class="">Scale symmetry in particle physics and cosmology</b></div>
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<p class="MsoNormal">Abstract:<span style="background-color: rgb(255, 255, 255);" class=""> </span>Scale symmetry can be a central ingredient in cosmology. It arises from fixed points of running couplings in quantum gravity - no intrinsic mass or length scales
are present anymore. Such a world can be realised in the infinite past and future of our Universe. </p>
<p class="MsoNormal"><span style="text-indent: 0.5in;" class="">The ultraviolet fixed point makes quantum gravity asymptotically safe and non-perturbatively renormalizable. Successful predictions, as for the mass of the Higgs boson, are related to the behavior
of couplings close to the fixed point. The approximate scale invariance close to the fixed point is reflected in cosmology in the almost scale invariant spectrum of the observed primordial cosmic fluctuations. The approach to the infrared fixed point in the
asymptotic future is characterized by the dynamics of an almost massless cosmon - the pseudo Goldstone boson of spontaneously broken scale symmetry. It is responsible for dynamical dark energy.</span></p>
<p class="MsoNormal"><span style="text-indent: 0.5in;" class="">Both inflation and the present dynamical dark energy arise from the same scalar field. The history of the Universe describes a crossover from a “past fixed point“ where all particles are massless,
to a “future fixed point“ where exact scale invariance is spontaneously broken, generating the particle masses. The cosmological solution can be extrapolated to the infinite past in physical time - the Universe has no beginning and no physical singularity.
A simple model is compatible with all present cosmological observations. It could be tested by the observation of huge lumps in the cosmic neutrino background, the detection of early dark energy , or rather large primordial graviton fluctuations generated
during inflation.</span></p>
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