HIGHLIGHTS
SUMMARY
To draw conclusions about fundamental physics at the very high energy scales probed during cosmic inflation, an important piece of information is still missing: what is the particle content at play in the primordial universe? The simplest models of inflation are of the single-clock kind: one scalar field both drives the background evolution and seeds the large-scale inhomogeneities that the authors observe nowadays in the cosmic microwave background and in the distribution of matter. Indeed, not only are flat scalar potentials sensitive to Planck-scale physics, but candidate theories at these scales . . .
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