Interferometer constraints on the inflationary field content

Laura Iacconi, Matteo Fasiello, Hooshyar Assadullahi, Emanuela Dimastrogiovanni, David Wands

Research output: Contribution to journalArticlepeer-review

6 Downloads (Pure)

Abstract

With an energy scale that can be as high as 1014 GeV, inflation may provide a unique probe of high-energy physics. Both scalar and tensor fluctuations generated during this early accelerated expansion contain crucial information about the particle content of the primordial universe. The advent of ground- and space-based interferometers enables us to probe primordial physics at length-scales much smaller than those corresponding to current CMB constraints. One key prediction of single-field slow-roll inflation is a red-tilted gravitational wave spectrum, currently inaccessible at interferometer scales. Interferometers probe directly inflationary physics that deviates from the minimal scenario and in particular additional particle content with sizeable couplings to the inflaton field. We adopt here an effective description for such fields and focus on the case of extra spin-2 fields. We find that a time-dependent sound speed for the helicity-2 modes can generate primordial gravitational waves with a blue-tilted spectrum, potentially detectable at interferometer scales.
Original languageEnglish
Article number31
Number of pages19
JournalJournal of Cosmology and Astroparticle Physics
Volume2020
Issue number03
DOIs
Publication statusPublished - 13 Mar 2020

Keywords

  • cosmological perturbation theory
  • inflation
  • primordial gravitational waves (theory)
  • RCUK
  • STFC
  • ST/N000668/1
  • ST/R505018/1

Fingerprint

Dive into the research topics of 'Interferometer constraints on the inflationary field content'. Together they form a unique fingerprint.

Cite this