Well "dark energy" is nothing more than a place-holder for "we've observed some weird behavior in the motion of objects that violates our theory of gravity, and we don't really know what is going on".
Otherwise known as "gap filler" in an otherwise falsified theory.
"Inflationary cosmology" is just a place-holder for "we've observed that the universe is really really huge, but strangely enough everywhere we look everything is roughly the same looking (on average), and we have no idea how this could have happened".
You just have to translate from science-speak to layperson-speak.
The problem is that inflation was created in one person's head (Alan Guth) and it's now supposedly dead and gone and can never be empirically put to the test. We have to accept the whole concept on "faith" in a "supernatural entity". No other known vector or scalar field in nature retains constant density over exponential increases in volume. It's the ultimate "supernatural entity" and it defies empirical testing processes because it presumably no longer even exists in nature. Talk about belief systems that are built on pure faith.
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