Abstract
In the quest for mathematical foundations of M-theory, the Hypothesis H that fluxes are quantized in Cohomotopy theory, implies, on flat but possibly singular spacetimes, that M-brane charges locally organize into equivariant homotopy groups of spheres. Here, we show how this leads to a correspondence between phenomena conjectured in M-theory and fundamental mathematical concepts/results in stable homotopy, generalized cohomology and Cobordism theory [Formula: see text] : â stems of homotopy groups correspond to charges of probe [Formula: see text]-branes near black [Formula: see text]-branes; â stabilization within a stem is the boundary-bulk transition; â the Adams d-invariant measures [Formula: see text]-flux; â trivialization of the d-invariant corresponds to [Formula: see text]-flux; â refined Toda brackets measure [Formula: see text]-flux; â the refined Adams e-invariant sees the [Formula: see text]-charge lattice; â vanishing Adams e-invariant implies consistent global [Formula: see text]-fields; â ConnerâFloydâs e-invariant is the [Formula: see text]-flux seen in the GreenâSchwarz mechanism; â the Hopf invariant is the M2-brane Page charge ([Formula: see text]-flux); â the PontrjaginâThom theorem associates the polarized brane worldvolumes sourcing all these charges. In particular, spontaneous K3-reductions with 24 branes are singled out from first principles : â Cobordism in the third stable stem witnesses spontaneous KK-compactification on K3-surfaces; â the order of the third stable stem implies the 24 NS5/D7-branes in M/F-theory on K3. Finally, complex-oriented cohomology emerges from Hypothesis H, connecting it to all previous proposals for brane charge quantization in the chromatic tower: K-theory, elliptic cohomology, etc. : â quaternionic orientations correspond to unit [Formula: see text]-fluxes near M2-branes; â complex orientations lift these unit [Formula: see text]-fluxes to heterotic M-theory with heterotic line bundles. In fact, we find quaternionic/complex Ravenel-orientations bounded in dimension; and we find the bound to be 10, as befits spacetime dimension [Formula: see text].
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