Wilfried Buchmüller

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Wilfried Buchmüller (* 1950 ) is a German theoretical elementary particle physicist.

Life

Buchmüller studied physics at the University of Bonn and at Imperial College in London . In 1977 he received his doctorate in Bonn and then was an assistant in Bonn, at Cornell University , at the Fermilab , at the Max Planck Institute for Physics in Munich and from 1984 to 1986 at CERN . From 1986 to 1990 he was a professor at the University of Hanover and then a senior scientist at DESY and since 1992 professor at the University of Hamburg . Among other things, he was visiting professor at the University of California, Santa Barbara and from 1992 to 1998 adjunct professor at Nordita in Copenhagen .

Buchmüller dealt in particular with the electroweak phase transition and the nature of matter-antimatter asymmetry, neutrino physics , the nature of dark matter and, in general, the field of research known as astroparticle physics from the interface between elementary particle physics and cosmology.

It has long been known that the CP violation observed, for example, during the decay of K mesons and B mesons is not sufficient to explain the observed matter-antimatter asymmetry. From the 1990s onwards, Buchmüller and colleagues favored a model of matter formation from the asymmetrical decay of heavy “sterile” Majorana neutrinos predicted in GUTs , which initially lead to asymmetry in leptons ( leptogenesis ) and then via the so-called sphaleron process (caused by non-perturbation theory topological structures in the nonabelian gauge theories of the GUTs) also leads to baryons. The model also predicts neutrino masses (with an upper limit of 0.12 eV). The models were examined in detail by Buchmüller and his theory group at DESY. As a dark matter candidate, he investigated gravitinos and possible signals of their decay for observations in gamma-ray astronomy.

He is co-editor of the Journal of Cosmology and Astroparticle Physics. Since 2005 he has been the spokesman for the Virtual Institute Particle Cosmology (VIPAC) of the Helmholtz Association, which is supposed to be the center for promoting astroparticle physics in Germany and was founded by working groups from the universities of Bonn, Heidelberg, Munich and DESY. In 2007 he was elected a full member of the Academy of Sciences in Hamburg .

Fonts

  • The structure of the vacuum and the origin of matter . In: Physics in Our Time , Volume 29, 1996, Issue 5, p. 211
  • arxiv : 0710.5857 Baryogenesis - 40 years later , PASCOS 2007
  • Wilfried Buchmüller, Roberto Peccei , Tsutomu Yanagida : Leptogenesis as the origin of matter . In: Annual Review of Particle and Nuclear Physics , Volume 55, 2005, pp. 311-355

Web links

References and footnotes

  1. ↑ that is, they interact neither electroweak nor strongly
  2. ↑ where the sphaleron occurs at higher temperatures, where the energy corresponds to the heights of the potential barriers between the vacuums, in contrast to tunnel solutions ( instantons ) with lower energies. The Sphaleron energy scale is believed to be around 10 TeV. Similar topological effects (affecting the axial anomaly) could be observed in the QCD, but already at a much lower energy (QCD) (10 GeV)
  3. ↑ On Buchmüller's work on CP injury 2002: A bound on neutrino masses from baryogenesis . ( arxiv : hep-ph / 0209301v1 ), the prediction of the neutrino mass is in: Buchmüller, Plümacher, Di Bari: A bound for the neutrino mass from baryogenesis . In: Physics Letters , B, Volume 547, 2002, p. 128, arxiv : hep-ph / 0209301 . Similar models (with SO (10) -GUT) were already used by Buchmüller, Plümacher: Baryon asymmetry and neutrino mixing . In: Physics Letters , B, Vol 389, 1996, p 73, arxiv : hep-ph / 9608308 examined,
  4. ↑ Buchmüller: Gravitino Dark Matter . Talk, Susy 09, arxiv : 0910.1870
  5. ↑ Communication from the Helmholtz Institute May 2009 (PDF)
personal data
SURNAME Buchmüller, Wilfried
BRIEF DESCRIPTION German physicist
DATE OF BIRTH 1950