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pro vyhledávání: '"Buchmüller, W"'
We study models of hybrid inflation in the framework of supergravity with superconformal matter. F-term hybrid inflation is not viable since the inflaton acquires a large tachyonic mass. On the contrary, D-term hybrid inflation can successfully accou
Externí odkaz:
http://arxiv.org/abs/1210.4105
Autor:
Brümmer, F., Buchmüller, W.
Grand-unified models with extra dimensions at the GUT scale will typically contain exotic states with Standard Model charges and GUT-scale masses. They can act as messengers for gauge-mediated supersymmetry breaking. If the number of messengers is si
Externí odkaz:
http://arxiv.org/abs/1105.0802
Publikováno v:
Annals Phys.324:1234-1260,2009
We study the approach to equilibrium for a scalar field which is coupled to a large thermal bath. Our analysis of the initial value problem is based on Kadanoff-Baym equations which are shown to be equivalent to a stochastic Langevin equation. The in
Externí odkaz:
http://arxiv.org/abs/0812.1934
Publikováno v:
JHEP0709:113,2007
We construct a 6D supergravity theory which emerges as intermediate step in the compactification of the heterotic string to the supersymmetric standard model in four dimensions. The theory has N=2 supersymmetry and a gravitational sector with one ten
Externí odkaz:
http://arxiv.org/abs/0707.1651
Autor:
Buchmüller, W., Lüdeling, C.
This is a short introduction to the Standard Model and the underlying concepts of quantum field theory.
Comment: Lectures given at the European School of High-Energy Physics, August 2005, Kitzbuehel, Austria, to appear in the proceedings
Comment: Lectures given at the European School of High-Energy Physics, August 2005, Kitzbuehel, Austria, to appear in the proceedings
Externí odkaz:
http://arxiv.org/abs/hep-ph/0609174
Publikováno v:
Phys.Lett.B574:156-161,2003
In higher-dimensional supersymmetric theories gauge couplings of the effective four-dimensional theory are determined by expectation values of scalar fields. We find that at temperatures above a critical temperature $T_*$, which depends on the supers
Externí odkaz:
http://arxiv.org/abs/hep-ph/0307181
Publikováno v:
Phys.Lett. B547 (2002) 128-132
Properties of neutrinos, the lightest of all elementary particles, may be the origin of the entire matter-antimatter asymmetry of the universe. This requires that neutrinos are Majorana particles, which are equal to their antiparticles, and that thei
Externí odkaz:
http://arxiv.org/abs/hep-ph/0209301
Publikováno v:
Nucl.Phys.B648:231-253,2003
We study anomalies of six-dimensional gauge theories compactified on orbifolds. In addition to the known bulk anomalies, brane anomalies appear on orbifold fixpoints in the case of chiral boundary conditions. At a fixpoint, where the bulk gauge group
Externí odkaz:
http://arxiv.org/abs/hep-ph/0209144
Publikováno v:
Phys.Lett. B540 (2002) 295-300
The coset spaces E$_8$/SO(10)$\times$H$_F$ allow complex structures which can account for three quark-lepton generations including right-handed neutrinos. We show that in the context of supersymmetric SO(10) gauge theories in 6 dimensions they also p
Externí odkaz:
http://arxiv.org/abs/hep-ph/0204358
Autor:
Buchmüller, W.
Data on solar and atmospheric neutrinos provide evidence for neutrino masses and mixings. We review some basic neutrino properties, the status of neutrino oscillations and implications for grand unified theories, including leptogenesis.
Comment:
Comment:
Externí odkaz:
http://arxiv.org/abs/hep-ph/0204288