Speaker
Description
Cosmological soft theorems (or consistency relations) provide a powerful probe
for the physics of inflation. These relations rely on minimal assumptions and hold very
generally. Consequently, any violation of these relations would rule out a large class of
inflationary models. For instance, a violation of the scalar soft theorem (or consistency
relation) would rule out all attractor single-field inflation models and instead point toward
either multi-field dynamics or a non-attractor phase. In this paper, we derive tree-level
multi-soft theorems, at leading order in the soft expansion, for both scalar and tensor
correlation functions. Our analysis employs the background-wave method, in which the
effect of long-wavelength modes is captured by an appropriate spatial coordinate rescaling.
In addition, we systematically incorporate soft-exchange contributions, including tensor
exchanges in scalar correlators and scalar exchanges in tensor correlators.
| Other topic / keywords: | Inflation, Consistency relations, Soft Theorems |
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