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Approximately 30-40% of all baryons in the present day universe reside in awarm-hot intergalactic medium (WHIM), with temperatures between 10^5<T<10^7 K.This is a generic prediction from six hydrodynamic simulations of currentlyfavored structure formation models having a wide variety of numerical methods,input physics, volumes, and spatial resolutions. Most of these warm-hot baryonsreside in diffuse large-scale structures with a median overdensity around10-30, not in virialized objects such as galaxy groups or galactic halos. Theevolution of the WHIM is primarily driven by shock heating from gravitationalperturbations breaking on mildly nonlinear, non-equilibrium structures such asfilaments. Supernova feedback energy and radiative cooling play lesser roles inits evolution. WHIM gas is consistent with observations of the 0.25 keV X-raybackground without being significantly heated by non-gravitational processesbecause the emitting gas is very diffuse. Our results confirm and extendprevious work by Cen & Ostriker and Dave' et al.Comment: 9 pages, emulateapj, submitted to Ap

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