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The identity of Dark Matter (DM) is one of the most captivating topics inparticle physics today. The R-parity conserving Minimal Supersymmetric StandardModel (MSSM), which naturally provides a DM candidate in the form of thelightest neutralino ($\tilde{\chi}_{1}^{0}$), is used as a benchmark scenarioto show that a measurement of $\Omega_{\tilde{\chi}_{1}^{0}}h^{2}$ can beachieved from measurements at the CERN Large Hadron Collider. Focus is placedon compressed mass spectra regions, where the mass difference between the$\tilde{\chi}_{1}^{0}$ and the $\tilde{\tau}_{1}$ is small and where the$\tilde{\tau}_{1}$-$\tilde{\chi}_{1}^{0}$ coannihilation (CA) mechanism of theearly Universe plays an important role. The technique for measuring$\Omega_{\tilde{\chi}_{1}^{0}}h^{2}$ relies on two proposed searches forcompressed Supersymmetry (SUSY): 1) production via Vector Boson Fusion (VBF)processes; and 2) production with associated energetic jets from initial stateradiation (ISR). These approaches allow for the determination of the relicabundance at the LHC for any model where CA is an important DM reductionmechanism in the early Universe. Thus, it is possible to confirm that the DM weobserve today were $\tilde{\chi}_{1}^{0}$'s created in the early Universe. Weshow that from measurements in the VBF and ISR SUSY searches at the LHC, thedark matter relic density can be measured with an uncertainty of 25\% with 3000fb$^{-1}$ of 13 TeV proton-proton data.

Connecting Particle Physics and Cosmology: Measuring the Dark Matter Relic Density in Compressed Supersymmetry at the LHC