Cosmological implications of Higgs near-criticality
Professor José R Espinosa, ICREA/IFAE Barcelona Spain
The Standard Model electroweak vacuum lies very close to the boundary between stability and metastability, with the last option being the most likely. Espinosa will discuss several cosmological implications of this so-called ‘near-criticality’. In the metastable vacuum case, Espinosa will describe the main challenges that the survival of the electroweak vacuum faces during the evolution of the Universe. In the stable vacuum case, Espinosa will critically examine the possibility of implementing Higgs inflation.
LHC: the energy and precision frontiers
Dr Sinead Farrington, University of Warwick, UK
This talk will review the latest results from the LHC. Results will cover two main areas. At the energy frontier, the LHC can search for increasingly high mass Beyond Standard Model particles, some of which are dark matter candidates. At the precision frontier, the LHC is gathering ever-larger samples of Standard Model particles. This enables sensitive searches for deviations from Standard Model predictions in order to search for clues to Beyond Standard Model physics.
Towards fundamental physics from the cosmic microwave background
Professor Hiranya Peiris, University College London, UK
Surveys of the cosmic microwave background (CMB) carry immense promise for measurements of new physics beyond the Standard Models of cosmology and particle physics. Here, Peiris will present an overview of current cosmological constraints from the CMB, and survey the capabilities of upcoming experiments, taking account of Galactic foregrounds and the effect of lensing by intervening large-scale structure. Peiris will present some recent results that highlight the science enabled by combining CMB data with large galaxy surveys. Peiris will comment on some of the experimental and methodological innovations that are needed to realise the promise of upcoming surveys.
Fate of the spectator Higgs during and after inflation
Professor Kari Enqvist, University of Helsinki, Finland
Enqvist discusses the fluctuations of the Higgs field during inflation, the displacement of the mean Higgs field away from the origin, and its subsequent decay. Enqvist will also discuss the Higgs field fluctuations during the preheating period, pointing out that resonant behaviour can induce large fluctuations which may destabilize the electroweak vacuum. Such considerations provide an upper bound on quartic and trilinear interactions between the Higgs and the inflation.