Prof.
Aalok Misra
(Indian Institute of Technology Roorkee)
25/09/2013, 14:00
Particle Phenomenology
We present a phenomenological model which could possibly be obtained as a local Swiss-Cheese Calabi-Yau string-theoretic compactification in the large volume limit with a mobile D3-brane restricted to a nearly special Lagrangian cycle in the Calabi-Yau and fluxed stacks of wrapped D7-branes. The model provides a natural realization of mu-Split SUSY with a high SUSY-breaking scale wherein the...
Mr
Rafael Alves Batista
(II. Institute for Theoretical Physics, University of Hamburg)
25/09/2013, 14:20
Cosmology & Astroparticle Physics
The origin, chemical composition, and mechanisms of acceleration of the ultra-high energy cosmic rays (UHECRs) are not yet well understood. Aiming for a better interpretation of the available experimental data, these data have to be confronted with theoretical models. In this sense, the development of numerical tools to propagate UHECRs is essential to constrain astrophysical parameters....
Dr
Giorgio Arcadi
(University of Göttingen)
25/09/2013, 14:40
Particle Phenomenology
Decaying Dark Matter is an interesting and viable alternative to the common paradigm of stable Dark Matter. We consider a simple extension of the Standard model with two states, a Dark Matter Majorana fermion and a colored or only electroweakly charged scalar, without introducing any symmetry to stabilize the DM state. We identify the parameter region accounting for an Indirect Dark Matter...
Andrey Saveliev
(University of Hamburg)
25/09/2013, 15:00
Cosmology & Astroparticle Physics
We present our results from semi-analytic computations on the time evolution of the energy content for primordial magnetic fields and the accompanying turbulent flows in the general framework of an expanding Universe with homogeneous and isotropic turbulence. In particular we include the backreaction of the turbulent medium on the magnetic field and point out the effect of helicity compared to...
Dr
Marc Gillioz
(CP3-Origins, University of Southern Denmark)
25/09/2013, 15:50
Particle Phenomenology
The conformal symmetry plays an important role in quantum field theories, even when it is explicitly broken by a renormalization group flow. The Weyl consistency conditions reflect its presence in the renormalized theory. They provide relations among the beta functions of the theory at different loop orders. As an example, we show how the Weyl consistency conditions affect the computation of...
Prof.
Jacek Wosiek
(Jagellonian University)
25/09/2013, 16:10
Particle Phenomenology
After explaining the role of generalized, i.e. multi-parton, ‘t Hooft equations in QCD, their numeric and analytic solutions will be discussed. The intriguing localization property, together with stringy interpretation will be demonstrated. Finally, we will derive analytically the complete basis of localized solutions satisfying appropriate, infrared safe, boundary conditions in all parton...
Prof.
Andrew Koshelkin
(Moscow Institute for Physics and Engineering)
25/09/2013, 16:30
Particle Phenomenology
In order to describe the dynamics of particle production and hadron spectrum in a flux tube, we start with an action integral in QCD4 in (3+1)dimensional space-time with a confining scalar transverse
interaction. Under the dominance of longitudinal motion of the
valence quark-antiquark pair, the four dimensional space-time
QCD4 can be compactified into QCD2 in (1+1)...
Dr
Pedro Schwaller
(CERN)
25/09/2013, 16:50
Particle Phenomenology
Most of the mass of ordinary matter has its origin from quantum chromodynamics (QCD). A similar strong dynamics, dark QCD, could exist to explain the mass origin of dark matter. Using infrared fixed points of the two gauge couplings, we provide a dynamical mechanism that relates the dark QCD confinement scale to our QCD scale, and hence provides an explanation for comparable dark baryon and...
Dr
Marco Drewes
(TU München)
25/09/2013, 17:10
Cosmology & Astroparticle Physics
I discuss leptogenesis in the type I seesaw model with Majorana masses below the electroweak scale and the perspectives to test this scenario in the laboratory. It is often stated that it can only be realised if either two Majorana masses are highly degenerate or new degrees of freedom in addition to the right handed neutrinos are added to the Standard Model. This is, however, only true in...
Dr
Anthony Hartin
(DESY)
26/09/2013, 15:50
Particle Phenomenology
A non-perturbative QFT - the Furry picture - which treats the interaction of particles with each other perturbatively and with intense electromagnetic fields exactly, is already used routinely in the calculation of the beamstrahlung and coherent pair production. The current implementation of the theory for existing calculations requires the approximation of ultra-relativistic, co-linear...
Dr
Masaki Asano
(University of Hamburg)
26/09/2013, 16:10
Particle Phenomenology
Natural supersymmetric spectra require light Higgsinos, light stops and sbottom to achieve the correct electroweak symmetry breaking without a fine tuning. Furthermore, taking into account two loop contribution to the Higgs mass squared term, gluino would not be very heavy. We study the gluino decay signal in natural supersymmetric spectra at the LHC. It would be different from simplified...
Germano Nardini
(Universität Bielefeld)
26/09/2013, 16:30
Cosmology & Astroparticle Physics
In order to explain the observed baryon asymmetry of the Universe, electroweak baryogenesis requires that the electroweak symmetry breaking occurred via a strong first-order phase transition. As proven more than a decade ago for a (lighter CP-even) Higgs mass m_h <~ 100 GeV, such a condition is fulfilled in the MSSM if the right-handed stop is very light. Recently, the same conclusion was...
Dr
Rose Lerner
(Helsinki University)
26/09/2013, 16:50
Cosmology & Astroparticle Physics
The curvaton is only a spectator field during inflation, but produces the observed curvature perturbation when it decays after inflation. We present a simple "realistic" model for the curvaton mechanism, where the curvaton is a real scalar coupled to the standard model Higgs Boson. This coupling to the higgs results both in interesting stochastic behaviour of the field during inflation, and in...
Dr
Kohei Kamada
(DESY)
26/09/2013, 17:10
Cosmology & Astroparticle Physics
Recent LHC results suggest the electroweak vacuum metastability. Although its lifetime is longer than the cosmic age in almost all the parameter space, quantum tunneling to the unwanted true vacuum in the quasi-de Sitter background may occur during inflation. This, in turn, constrains severely high-scale inflation models. In this talk, we discuss how to avoid such tunneling during high-scale...
