Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2018/01/019
Keywords
inflation; cosmological parameters from CMBR
Funding
- STFC studentship
- Royal Society University Research Fellowship
- European Research Council under the European Union's Seventh Framework Programme (FP) / ERC Grant [616170]
- Science and Technology Facilities Council [ST/L000652/1]
- Science and Technology Facilities Council [ST/M003574/1, 1501547, ST/L000652/1, ST/P000525/1] Funding Source: researchfish
- STFC [ST/L000652/1, ST/P000525/1, ST/M003574/1] Funding Source: UKRI
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The spectral index of scalar perturbations is an important observable that allows us to learn about inflationary physics. In particular, a detection of a significant deviation from a constant spectral index could enable us to rule out the simplest class of inflation models. We investigate whether future observations could rule out canonical single-field slow-roll inflation given the parameters allowed by current observational constraints. We find that future measurements of a constant running (or running of the running) of the spectral index over currently available scales are unlikely to achieve this. However, there remains a large region of parameter space (especially when considering the running of the running) for falsifying the assumed class of slow-roll models if future observations accurately constrain a much wider range of scales.
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