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Séminaires et colloques
Séminaire Guillaume Chalons
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Europe/Paris
Grand Amphi (LPSC)
Grand Amphi
LPSC
Description
Precision calculations for Dark Matter self-annihilation in Supersymmetric theories.
There is robust evidence on astrophysical and cosmological scales for the presence of particle Dark Matter (DM) in our universe. With the measurement of its present cosmological abundance by the PLANCK satellite with an unprecedented accuracy, we have entered an era of precision measurements of cosmological parameters. The relic density of DM can be quite naturally accounted for by a weakly interactive massive particle (WIMP). At the subatomic level, the discovery of the (a?) Higgs boson at the LHC is a milestone in the quest for unravelling how elementary particles get a mass, the so-called ElectroWeak Symmetry Breaking (EWSB) riddle. As these two enigmas involve weakly interactive particles, it is natural to ask oneself if they can be both resolved in an unified paradigm. The Standard Model, the theory explaining the behavior of elementary particles at the quantum level, cannot address these shortcomings both. Lots of models, going beyond the Standard Model (BSM), have emerged to answer these questions. One of the best motivated and most studied models, Supersymmetry (SUSY), gives an elegant explanation to both problems by postulating a new symmetry between bosons and fermions. The ElectroWeak (EW) scale is then stabilized and several SUSY particles can postulate as the DM particle.
A particularly well studied candidate is the neutralino and determining the properties of this particle is the subject of an intense experimental effort at colliders, direct detection and indirect detection experiments. As the experimental precision on cosmological parameters is increasing, on the theory side we need to rely on precise prediction to reach, at least, the same level of accuracy, meaning that calculations beyond leading-order (LO) must be performed.
In this seminar I will present the SloopS code and some of its applications to the computation of the DM relic density at one-loop level in the Minimal Supersymmetric Standard Model (MSSM). The complete renormalization needed for the computation will be presented and some particular quantum effects affecting the self-annihilation, which are absent at LO, will be scrutinized.
I will also discuss the interpretation of the recently claimed gamma-ray line signal found in the FERMI data as coming from DM annihilation, in the framework of the Next-to-Minimal Supersymmetric Model (NMSSM). A particular attention will be paid in considering the interplay between DM searches and the LHC to confirm the SUSY origin of the signal.
There is robust evidence on astrophysical and cosmological scales for the presence of particle Dark Matter (DM) in our universe. With the measurement of its present cosmological abundance by the PLANCK satellite with an unprecedented accuracy, we have entered an era of precision measurements of cosmological parameters. The relic density of DM can be quite naturally accounted for by a weakly interactive massive particle (WIMP). At the subatomic level, the discovery of the (a?) Higgs boson at the LHC is a milestone in the quest for unravelling how elementary particles get a mass, the so-called ElectroWeak Symmetry Breaking (EWSB) riddle. As these two enigmas involve weakly interactive particles, it is natural to ask oneself if they can be both resolved in an unified paradigm. The Standard Model, the theory explaining the behavior of elementary particles at the quantum level, cannot address these shortcomings both. Lots of models, going beyond the Standard Model (BSM), have emerged to answer these questions. One of the best motivated and most studied models, Supersymmetry (SUSY), gives an elegant explanation to both problems by postulating a new symmetry between bosons and fermions. The ElectroWeak (EW) scale is then stabilized and several SUSY particles can postulate as the DM particle.
A particularly well studied candidate is the neutralino and determining the properties of this particle is the subject of an intense experimental effort at colliders, direct detection and indirect detection experiments. As the experimental precision on cosmological parameters is increasing, on the theory side we need to rely on precise prediction to reach, at least, the same level of accuracy, meaning that calculations beyond leading-order (LO) must be performed.
In this seminar I will present the SloopS code and some of its applications to the computation of the DM relic density at one-loop level in the Minimal Supersymmetric Standard Model (MSSM). The complete renormalization needed for the computation will be presented and some particular quantum effects affecting the self-annihilation, which are absent at LO, will be scrutinized.
I will also discuss the interpretation of the recently claimed gamma-ray line signal found in the FERMI data as coming from DM annihilation, in the framework of the Next-to-Minimal Supersymmetric Model (NMSSM). A particular attention will be paid in considering the interplay between DM searches and the LHC to confirm the SUSY origin of the signal.
