large-charge

The large-charge master field which generates all n-point correlation functions with an insertion of large charge Q in non-relativistic …

The large charge approach allows to describe special sectors of strongly-coupled systems. When another controlling parameter is present, it is still useful because it allows to unveil interesting mathematical structures and access previously unexplored parts of the spectrum. In this talk I will concentrate on the O(N) vector model in the large-N limit, give a geometrical interpretation of the asymptotic expansion of the dimension of the lowest operator of fixed charge, and use resurgence to resum this expansion. The result suggests an unexpected interplay between conformal symmetry and resurgence and will lead to an intuitive interpretation for the impressive agreement of the large-charge predictions with lattice data also in the O(2) model case. Based on 1610.04495, 2008.03308, 2102.12488.

The large charge approach allows to describe special sectors of strongly-coupled systems. When another controlling parameter is present, it is still useful because it allows to unveil interesting mathematical structures and access previously unexplored parts of the spectrum. In this talk I will concentrate on the O(N) vector model in the large-N limit, give a geometrical interpretation of the asymptotic expansion of the dimension of the lowest operator of fixed charge, and use resurgence to resum this expansion. The result suggests an unexpected interplay between conformal symmetry and resurgence and will lead to an intuitive interpretation for the impressive agreement of the large-charge predictions with lattice data also in the O(2) model case. Based on 1610.04495, 2008.03308, 2102.12488.

We study the unitary Fermi gas in a harmonic trapping potential starting from a microscopic theory in the limit of large charge and …

We study the spectrum of scalar charged operators in CFTs with a U(1) global symmetry. The charged operators are dual, by the …

The large charge approach allows to describe special sectors of strongly-coupled systems. When another controlling parameter is present, it is still useful because it allows to unveil interesting mathematical structures and access previously unexplored parts of the spectrum. In this talk I will discuss the case of fermionic CFTs in three dimensions. Depending on the model and the nature of the fixed charge, we find two types of descriptions: in terms of a superfluid or a Fermi sphere. We explicitly compute the conformal dimensions of the lowest operator of fixed charge and in the superfluid case verify the EFT predictions for the phonon spectrum

The Charge Convexity Conjecture (i.e. the conjecture that the spectrum of the lowest charged operator in a CFT is a convex function of Q) implies, through holographic duality, the Positive Binding Conjecture: that gravitational theories in AdS with a U(1) gauge symmetry must contain a charged particle which has positive self-binding energy. Here we study the spectrum of scalar charged operators in CFTs with a U(1) global symmetry. We show that this spectrum is necessarily convex if it is well approximated by a field which realises the global symmetry non-linearly.

The Charge Convexity Conjecture (i.e. the conjecture that the spectrum of the lowest charged operator in a CFT is a convex function of Q) implies, through holographic duality, the Positive Binding Conjecture: that gravitational theories in AdS with a U(1) gauge symmetry must contain a charged particle which has positive self-binding energy. Here we study the spectrum of scalar charged operators in CFTs with a U(1) global symmetry. We show that this spectrum is necessarily convex if it is well approximated by a field which realises the global symmetry non-linearly.

The large charge approach allows to describe special sectors of strongly-coupled systems. When another controlling parameter is present, it is still useful because it allows to unveil interesting mathematical structures and access previously unexplored parts of the spectrum. In this talk I will concentrate on the O(N) vector model in the large-N limit, give a geometrical interpretation of the asymptotic expansion of the dimension of the lowest operator of fixed charge, and use resurgence to resum this expansion. The result suggests a still unexplored interplay between conformal symmetry and resurgence and will lead to an intuitive interpretation for the impressive agreement of the large-charge predictions with lattice data also in the O(2) model case.

We study the large-charge sector of large-N fermionic CFTs in three dimensions.