Searches for vector-like quarks, $\mathbf{t\bar{t}}$ and $\mathbf{t+b}$ resonances with ATLAS and CMS

In many models of physics beyond the Standard Model the coupling of new physics to third generation quarks is enhanced and signatures are expected that mimic top quark production.The talk presents results from searches for new resonances decaying to a top-antitop or a top-b-jet pair. In addition, we report on several search channels for heavy vector-like quarks decaying to a Higgs boson, a W boson, or a Z boson in association with top or b-quarks. Many results use novel analysis techniques to reconstruct the highly boosted final states that are created in these topologies. The searches are performed on data collected with the ATLAS and CMS experiments in proton-proton collisions at the LHC at a centre-of-mass energy of 7 and 8 TeV.