Solid Consistency

Abstract

We argue that $isotropic$ scalar fluctuations in solid inflation are adiabatic in the super-horizon limit. During the solid phase this adiabatic mode has peculiar features: constant energy-density slices and comoving slices do not coincide, and their curvatures, parameterized respectively by $\zeta$ and $\mathcal{R}$, both evolve in time. The existence of this adiabatic mode implies that Maldacena's squeezed limit consistency relation holds after angular average over the long mode. The correlation functions of a long-wavelength spherical scalar mode with several short scalar or tensor modes is fixed by the scaling behavior of the correlators of short modes, independently of the solid inflation action or dynamics of reheating.

10 pages. v2: minor changes, matches JCAP version

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• Gaugid inflation
• Fluids, Superfluids and Supersolids: Dynamics and Cosmology of Self Gravitating Media
• Solid Soft Theorems
• Large gauge transformation, Soft theorem, and Infrared divergence in inflationary spacetime
• Anisotropic separate universe and Weinberg's adiabatic mode
• Primordial Stochastic Gravitational Wave Background Anisotropies: in-in Formalization and Applications
• Probing parity-odd bispectra with anisotropies of GW $V$ modes
• Primordial Non-Gaussianity in Supersolid Inflation
• Primordial tensor bispectra in $\mu$-CMB cross-correlations
• Soft theorems for boosts and other time symmetries
• Zoology of Graviton non-Gaussianities
• Primordial Tensor Non-Gaussianity from Massive Gravity
• Spatial Curvature at the Sound Horizon
• Evolution of perturbations in a universe with exotic solid-like matter