Inflation theory describing our observable universe all the way back from a single singularity inside nothingness and inflating multifold times at a tiny fraction of time at the beginning and therefore preserving uniform conditions and causality coherence of light afterwards at the recombination era, is strongly supported by CMB and the expansion of the universe observations.
However, latest James Webb space telescope discovery of 6 universe breaking galaxies although it is said to only affect our possible limited understanding of galaxies formation, IMHO brings deeper implications to the Inflation model itself and reopens the Cosmological Horizon problem.
In my opinion there could be two possible actual alternate explanations besides the nowadays seems debatable Inflation theory especially after the new data received by the James Webb telescope:
1) A variable speed of light theory which assumes the maximum speed of light (i.e. speed of causality) in the early universe was larger than c when the vacuum energy density was then also much larger, thus superluminous by today's standards that would accelerated also the formation of galaxies in the early universe which the new JWST data suggest. However, this theory has significant problems with quantum physics in general since this would lead to the formation possible of not normal known matter consisting these 6 galaxies that would contradict with the spectroscopic data collected of their elements constituents. In other words if we find these 6 "primordial" galaxies to consist of known elements like hydrogen, helium, iron, nickel etc. after the awaited spectroscopic data come in then it is very difficult the variable speed of light theory and alternative explanation to the Cosmological Horizon Problem to be a valid alternative explanation.
A second plausible alternative explanation that I suggest which however has not the problems of the previous alternative (1) explanation and as far as I know would not contradict the recent JWST data but also CMB and expansion of the universe observations is the following briefly described:
2) Free vacuum space preexisted before the Big Bang (BB).
There was not a single singularity in the beginning but instead multiple singularities all over preexisting vacuum space and appearing more or less at t=0 simultaneously and inflating. The all process of creation is then similar to a phase transition of a preexisting bulk of water (vacuum space) to ice (matter and light). It is as if vacuum energy was phase transitioned to our known matter and light. This proposed model would support the observed homogeneuty CMB data of the observable universe, explain the horizon problem without the use of variable speed of light theories and also does not prohibit the expansion of the universe.
What are the problems with the above proposed alternative model you can see that makes the above (2) suggestion fundamentally WRONG? According to existing theories and current observations?
Research Proposal Universe Creation in a Preexisting Free Space with Multiple ...