Can tachyon fields explain the universe's first moments?

Tachyon inflation proposes that a quantum field resembling faster-than-light particles drove the universe's explosive early expansion. By choosing the Hubble expansion rate as the key variable and introducing a simple linear relationship between slow-roll parameters, the authors derived exact formulas for two key observables — the spectral index and tensor-to-scalar ratio — and found significantly better agreement with Planck, ACT, and DESI data than earlier attempts. The approach could extend to other inflation models.