Your words...............Since the detection of the Higgs boson in 2012 [2], no new fundamental particles have been discerned through the full-contact method to supplement the Standard Model or decipher the longstanding mysteries of dark energy, dark matter or gravity at the quantum scale.....................
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Well said, Higgs was the last.
These "the longstanding mysteries of dark energy, dark matter or gravity at the quantum scale".... are creating lots of other problems like: Wastage of highly intellectual human resources, Draining of financial resources etc.. Further research on these is not taking us anywhere.
As you have suggested, other models are also to be considered. Please see the foundational thinking of "Dynamic Universe model" in my essay.... "
A properly deciding, Computing and Predicting new theory's Philosophy "
Best
SNP. Gupta