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Ponder it this way maybe. At the start you have an absurdly high energy density come into existence before / marking the creation of space-time and its dimensions. The environment is perhaps mathematically modeled or under the "laws" (if they exist) of Quantum Gravity - General Relativity simply breaks down when the energies are so huge as to totally warp space-times topology. The Four force model we see all around us doesn't hold any sway at this creation moment.
Your modelling must really be all about topology - the newly formed curvature of the space-time field, far more I posit than newly arrived energy ball within it, is what defines what happens next. Things rapidly go Bada boom, but rather than envisage a decent boom in a large room, consider it is space-time itself being created and dimensionally unwrapping that is the dominant factor in the event; not the energy concentration spreading its thing around this newly formed space-time. The space-time field itself is spewing out and the laws of GR don't direct it very tightly.
By the time inflation ends, some 10 ^ -34 seconds after the existence event occurs, space-time may have inflated way faster than the speed of light in a vaccuum and the entire universe in this model is now maybe the size of a basketball with all the energy clumps in it are travelling apart by this "topology explosion" so fast that they are all casually disconnected from each other - as the force carriers that dominant our reality simply can't travel fast enough to compensate for that brief period when lightspeed wasn't the fastest thing around. These departing clumps of energy are cooling rapidly to the point where quantum gravity as the dominant environment controller is breaking down force at a time until you get to the four force model that rules most of the universe today (black holes and a few other exotics still excluded). Some models say our universe is one of these clumps.
During that first stint its really the medium - the topology of space-time itself - which is shaped by any matter or energy in it - that is the most important thing to analyse - rather than any specific things within in!
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