We derive the quadratic action for the physical degrees of freedom of massless spin-0, spin-
1, and spin-2 perturbations on a Schwarzschild-(A) dS background in arbitrary dimensions …

This is a book on the theory of the special relativity that, on the one hand, has been written
from a critical perspective; and on the other, suggests a way to construct a discrete and …

The dispersion relation ε (k) of the elementary excitations of superfluid He 4 has been
measured at very low temperatures, from saturated vapor pressure up to solidification, using …

We review recent progress and a number of future directions for applications of effective field
theory methods to condensed matter systems broadly defined. Our emphasis is on areas …

The late time physics of interacting QFTs at finite temperature is controlled by
hydrodynamics. For CFTs this implies that heavy operators--which are generically expected …

We employ an effective field theory to study the detectability of sub-GeV dark matter through
its interaction with the gapless excitations of superfluid^ 4 4 He. In a quantum field theory …

A bstract We employ hydrodynamics and gauge/gravity to study magneto-transport in
phases of matter where translations are broken (pseudo-) spontaneously. First we provide a …

We consider a model of sub-GeV dark matter whose interaction with the Standard Model is
mediated by a new vector boson (the dark photon) which couples kinetically to the photon …

We present the analysis of a new signature for light dark matter detection with superfluid He
4: the emission of three phonons. We show that, in a region of mass below the MeV, the …

The observed tightness of the mass discrepancy-acceleration relation (MDAR) poses a fine-
tuning challenge to current models of galaxy formation. We propose that this relation could …