Talks

We describe a class of non-Fermi liquid systems, using the AdS/CFT correspondence. The Fermi surfaces are studied by computing the response functions of fermionic operators. The scaling behavior near the Fermi surfaces is determined by conformal dimensions in an emergent IR CFT. The low-energy excitations near the Fermi momenta are not Landau quasiparticles. When the operator is marginal in the IR CFT, the full spectral function is precisely of the `marginal Fermi liquid' form, introduced as a phenomenological model of the `strange metal' phase of high temperature superconductors.

The sneutrino is a viable NLSP candidate in SUSY with gravitino LSP. In my talk I will focus on this possibility, in particular concentrating on the question of whether the LHC can distinguish spectra with a sneutrino NLSP from alternatives, e.g. ones with neutralino LSP. I will show that there are at least two different families of experimentally allowed spectra with sneutrino NLSP which exhibit distinctive multilepton signals. These spectra are not easy to fake within the MSSM. I will discuss these signals in detail and illustrate our analysis approach on simulations.