Results from Di-Higgs Searches with the ATLAS detector at CERN's Large Hadron Collider

The Standard Model of Particle Physics (SM) has been incredibly successful with its predictions validated by observations. The discovery of the Higgs boson (H) in 2012 by ATLAS and CMS experiments at the Large Hadron Collider (LHC) was a triumph of the SM. Since its discovery, many measurements of the Higgs boson’s properties have been carried out, and so far all the results agree with the SM predictions within uncertainties. However, in order to fully characterize the Higgs boson, it is necessary to measure its coupling to itself (Higgs self-coupling), a property that has deep theoretical and cosmological consequences. Measurement of the quartic Higgs self-coupling is not possible in any current experimental facility, but the trilinear Higgs boson self-coupling can be accessed in events with pair-produced Higgs bosons (HH) at the LHC. In this talk, we will present the most recent results from HH searches performed with the ATLAS detector at the LHC, including results on trilinear Higgs self-coupling and results from Beyond the SM searches in the HH decay modes.