Max A. Metlitski

Anomalous axion interactions and topological currents in dense matter

Recently an effective Lagrangian for the interactions of photons, Nambu-Goldstone bosons and superfluid phonons in dense quark matter has been derived using anomaly matching arguments. In this paper we illuminate the nature of certain anomalous terms in this Lagrangian by an explicit microscopic calculation. We also generalize the corresponding construction to introduce the axion field. We derive an anomalous axion effective Lagrangian describing the interactions of axions with photons and superfluid phonons in the dense matter background. This effective Lagrangian, among other things, implies that an axion current will be induced in the presence of magnetic field. We speculate that this current may be responsible for the explanation of neutron star kicks.

Neutron Stars as Type-I Superconductors

In a recent paper by Link, it was pointed out that the standard picture of the neutron star core composed of a mixture of a neutron superfluid and a proton type-II superconductor is inconsistent with observations of a long period precession in isolated pulsars. In the following we will show that an appropriate treatment of the interacting two-component superfluid (made of neutron and proton Cooper pairs), when the structure of proton vortices is strongly modified, may dramatically change the standard picture, resulting in a type-I superconductor. In this case the magnetic field is expelled from the superconducting regions of the neutron star, leading to the formation of the intermediate state when alternating domains of superconducting matter and normal matter coexist.

Duality and bosonization of (2+1) -dimensional Majorana fermions

We construct a dual bosonized description of a massless Majorana fermion in

θ-parameter in 2 color QCD at finite baryon and isospin density

(2+1)d

Vortices and type-I superconductivity in neutron stars

. In contrast to Dirac fermions, for which a bosonized description can be constructed using a flux attachment procedure, neutral Majorana fermions call for a different approach. We argue that the dual theory is an

Deconfined quantum critical points: symmetries and dualities

SO(N)_1

θ dependence of QCD at finite isospin density

Chern-Simons gauge theory with a critical

Vortons in two component Bose-Einstein condensates

SO(N)

Drum vortons in high density QCD

vector bosonic matter field (

Currents on superconducting strings at finite chemical potential and temperature

N geq 3