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Theory Seminars

Pizza Seminars

SEMINAR - Gravitational waves from first order phase transitions

Friday November 30th 2012, 2:30 pm - Seminar room

Speaker: Chiara Caprini (Institut de Physique Théorique, CEA Saclay)

Abstract: Gravitational waves can represent a unique probe of the very early universe. After an introduction about the main properties of the stochastic background of gravitational waves from primordial sources, the seminar concentrates on the gravitational wave signal from a primordial first order phase transition.

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SEMINAR - Issues in alphas determinations from tau decays

Friday November 23rd 2012, 2:30 pm - Seminar room

Speaker: Diogo Boito (Technische Universität München)

Abstract: We will discuss recent developments in the QCD description of hadronic tau decays with emphasis in the perturbative contribution. Various moments of the hadronic spectral functions have been employed in the determination of the strong coupling alpha_s from tau decays.We will analyse the behaviour of their perturbative series under different assumptions for the large-order corrections and for the renormalization group improvement of the series.

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SEMINAR - Current status of gamma-ray dark matter searches with Fermi/LATst

Wednesday  November 21st 2012, 3 pm - Seminar room

Speaker: Miguel Ángel Sánchez Conde , KIPAC- SLAC National Accelerator Laboratory

Abstract: Since its launch in 2008, the NASA Fermi satellite has been extensively searching for dark matter induced gamma-rays. Indeed, Fermi/LAT results have made significant inroads in limiting the standard “WIMP miracle” dark matter scenario, providing the most stringent limits in the annihilation cross section so far.

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SEMINAR - Lattice input on the tau V_us determination puzzle

Friday November 16th 2012, 2:30 pm - Seminar room

Speaker: Kim Maltman (York University (CA) and Adelaide University (Aus)

Abstract: Recent determinations of V_us from flavor-breaking sum rules involving strange and non-strange hadronic tau decay data yield values significantly lower than expectations based on three-family unitarity, and also than those obtained from analyses of K_{ell 3} and the ratio of K_{mu 2} to pi_{mu 2} decay widths.

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MAM SEMINAR - BSM theories face Higgs coupling data

Thursday  November 15th 2012, 2 pm - Coffee room

Speaker: Sandeepan Gupta

Abstract: In this talk I will discuss how to probe Beyond Standard Model theories with Higgs coupling data.

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MAM SEMINAR - The vacuum wave functional for Yang-Mills theory in 3 dimensions

Wednesday November 7th 2012, 2 pm - Coffee room

Speaker: Sebastian Krug

Abstract: I will explain the vacuum wave functional, and present and compare three different methods to obtain the VWF for Yang-Mills theory in 3 dimensions. I will conclude showing how to use it to calculate physical quantities, in particular the static potential.

SEMINAR - Gamma ray astronomy and the origin of galactic cosmic rays

Monday November 5th 2012, 12 pm- Seminar room

Speaker: S. Gabici (Laboratoire APC - CNRS/Université Paris 7)

Abstract: He will give a comprehensive introduction for non-experts, so that it can reach a wider audience.


SEMINAR - Hitting a Natural Higgs in SUSY

Wednesday October 31st 2012, 2:30 pm - Downstairs meeting room

Speaker: Chris Wymant (University of Durham)

Abstract: Supersymmetric theories solve the hierarchy problem chiefly by virtue of a partner for the top quark, the stop, which contributes to the Higgs mass correction an equal amount with the opposite sign.

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SEMINAR - Holography of the Weyl semi-metals

Friday October 26th 2012,  14:30 pm - Seminar room

Speaker: Umut Gursoy (CERN)

Abstract: Weyl semi-metals can be thought of higher dimensional analogs of Graphene, where the single-fermion excitations exhibit Weyl-like dispersion instead of Dirac.

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Non-Abelian discrete gauge symmetries in String Theory

Thursday, October 11th 2012, 11:45am - Seminar room

Speaker: Pablo González Cámara (Barcelona Univ.)


I will discuss the realization of non-Abelian discrete gauge symmetries in 4d field theory and string theory compactifications, as well as their possible relevance for flavor physics.



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