Speaker: Víctor Cáncer 

Affiliation:
IFAE – UAB

Title:
Black rubbers and non-linear elastic response of scale invariant solids

Abstract:
I will discuss the non-linear elastic response in scale invariant solids. These type of solids can be split in two different options: according to whether
scale invariance (SI) is a manifest or a spontaneously broken symmetry. In the latter case, one can employ effective field theory methods, whereas in the former we use holographic methods.
We focus on a simple class of holographic models that exhibit elastic behaviour, and obtain their nonlinear stress-strain curves as well as an estimate of the elasticity bounds — the maximum possible deformation in the elastic (reversible) regime.
The bounds differ substantially in the manifest or spontaneously broken SI cases, even when the same stress-strain curve is assumed in both cases.
Additionally, the hyper-elastic subset of models (that allow for large deformations) is found to have stress-strain curves akin to natural rubber.
The holographic instances in this category, which we dub black rubber, display richer stress-strain curves – with two different power-law regimes at different magnitudes of the strain.