Transpiration is the process of whiskey moving in and out of the wood, or even through the wood. This process occurs in a regular barrel by virtue of the osmotic pressure changing from the changing temperature and humidity on the outside of the stave relative to the inside for the whiskey-filled barrel. If you have free floating staves or wood inside the liquid, you don't have this effect. To some degree, you might try to artificially replicate this effect by pressurizing and de-pressuring the whiskey in the barrel; there is a US craft distillery who does this for their "fast aged" whiskey, although again, they have not accelerated aging, but transpiration and thus extraction.
Aging is aging, you don't accelerate by temperature swings, but elevated temperatures will increase the reactions of aging compared to lowered temperatures, although all the different chemical processes do NOT change their rates of reaction to the same degree with a change in temperature. In fact, some reactions can change by orders of magnitude with temperature, and others almost not at all! Many people unfamiliar with the science of barrel aging will confuse aging, extraction, and transpiration. The transpiration affects both extraction and "filtration", the latter in the case of charred barrels. It can also cause a concentration in the solutes with longer aging (so-called "angel share" effect). Hence, why using a sealed non-oak container with oak adjuncts inside is NOT the same as using an oak barrel as far as transpiration.
The UV treatment methods are currently patented. We have not tried them ourselves. This is an example of an expensive technology that could be used to do a rapid "aging", because it will increase the speed of some of the aging reactions without having to overly elevate the temperature. However, it will not necessarily be exactly the same result, because photo-induced chemistries will increase at rates different from those from changing temperature, and which reactions increase is different, so the result is different from long aging.
Sound and ultrasound can increase extraction. Ultrasound can maybe increase some chemical reactions (photoacoustic chemistry), although I have not seen evidence of a good result for this.
Oxygenation by itself is actually a potential problem, unless balanced with appropriate technologies to use the oxygen in reactions normally associated with aging, like esterification.
In any case, I am not arguing you can't throw all the technology plus the kitchen sink at the problem to get something comparable to longer aging in shorter time. You might well be able to, but it probably will be expensive to do, and may not taste exactly the same, and is not aging in any case, and the TTB won't let you call it that. Aging occurs, according to the TTB, in OAK BARRELS, and means length of time, legally. Period. And the flavor profile from long aging is complicated, and affected by many environmental factors, so replicating it with other technologies is a challenge.
In the end, you make your whiskey, you properly label it, you tell the consumer (hopefully) what you did, and they like or not and pay you accordingly!
FYI, I am a retired physicist who spent 40+ years studying photochemical-induced organic reactions, among other things, and so this colors my perspective.