162 citations · 1.5k across the 41 of their papers we have counts for
36 papers · 1 filter
Vector Superradiance without Separability: Instability Rates from the Worldline Effective Theory
Keegan Cove, Jingping Li, Riccardo Penco
We use a point-particle effective field theory to study the superradiant instability rates of an ultralight massive vector around a slowly rotating black hole. Earlier effective-th…
Effective Field Theories for Material Media
Angelo Esposito, Alberto Nicolis, Riccardo Penco
We review recent progress in understanding certain aspects of condensed matter systems from a high energy theory perspective. We discuss effective field theories that describe coll…
Geometric Symmetries for the Vanishing of the Black Hole Tidal Love Numbers
Roman Berens, Lam Hui, Daniel McLoughlin +2
We present a unified geometric perspective on the symmetries underlying the spin 0, 1 and 2 static perturbations around a Schwarzschild black hole. In all cases, the symmetries are…
Effective Description of Ajar Systems with a Symmetry
Can Onur Akyuz, Riccardo Penco
We introduce the concept of "ajar systems" as an intermediate case between closed and open systems, where the time scale for charge exchange with the environment is parametrically…
The Schwinger-Keldysh Coset Construction
Can Onur Akyuz, Garrett Goon, Riccardo Penco
The coset construction is a tool for systematically building low energy effective actions for Nambu-Goldstone modes. This technique is typically used to compute time-ordered correl…
Snowmass White Paper: Effective Field Theories for Condensed Matter Systems
Tomas Brauner, Sean A. Hartnoll, Pavel Kovtun +6
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…
Near-Zone Symmetries of Kerr Black Holes
Lam Hui, Austin Joyce, Riccardo Penco +2
We study the near-zone symmetries of a massless scalar field on four-dimensional black hole backgrounds. We provide a geometric understanding that unifies various recently discover…
Fractional soft limits
Tomáš Brauner, Angelo Esposito, Riccardo Penco
It is a common lore that the amplitude for a scattering process involving one soft Nambu--Goldstone boson should scale like an integer power of the soft momentum. We revisit this e…
An Effective Field Theory of Magneto-Elasticity
Shashin Pavaskar, Riccardo Penco, Ira Z. Rothstein
We utilize the coset construction to derive the effective field theory of magnon-phonon interactions in (anti)-ferromagnetic and ferrimagnetic insulating materials. The action is u…
Ladder Symmetries of Black Holes: Implications for Love Numbers and No-Hair Theorems
Lam Hui, Austin Joyce, Riccardo Penco +2
It is well known that asymptotically flat black holes in general relativity have a vanishing static, conservative tidal response. We show that this is a result of linearly realized…
Static response and Love numbers of Schwarzschild black holes
Lam Hui, Austin Joyce, Riccardo Penco +2
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…
An Introduction to Effective Field Theories
Riccardo Penco
These notes are an overview of effective field theory (EFT) methods. I discuss toy model EFTs, chiral perturbation theory, Fermi liquid theory, and non-relativistic QED, and use th…
A Universal Relation Between Corrections to Entropy and Extremality
Garrett Goon, Riccardo Penco
Perturbative corrections to General Relativity alter the expressions for both the entropy of black holes and their extremality bounds. We prove a universal relation between the lea…
Shift symmetries, soft limits, and the double copy beyond leading order
Mariana Carrillo-Gonzalez, Riccardo Penco, Mark Trodden
In this paper, we compute the higher derivative amplitudes arising from shift symmetric-invariant actions for both the non-linear sigma model and the special galileon symmetries, a…
Gauged Galileons
Sebastian Garcia-Saenz, Jonghee Kang, Riccardo Penco
We discuss the gauging of non-linearly realized symmetries as a method to systematically construct spontaneously broken gauge theories. We focus in particular on galileon fields an…
Stable wormholes in scalar-tensor theories
Gabriele Franciolini, Lam Hui, Riccardo Penco +2
We reconsider the issue of whether scalar-tensor theories can admit stable wormhole configurations supported by a non-trivial radial profile for the scalar field. Using a recently…
Effective Field Theory of Black Hole Quasinormal Modes in Scalar-Tensor Theories
Gabriele Franciolini, Lam Hui, Riccardo Penco +2
The final ringdown phase in a coalescence process is a valuable laboratory to test General Relativity and potentially constrain additional degrees of freedom in the gravitational s…
Radiation of scalar modes and the classical double copy
Mariana Carrillo-Gonzalez, Riccardo Penco, Mark Trodden
The double copy procedure relates gauge and gravity theories through color-kinematics replacements and holds for both scattering amplitudes and in classical contexts. Moreover, it…
The classical double copy in maximally symmetric spacetimes
Mariana Carrillo-Gonzalez, Riccardo Penco, Mark Trodden
The classical double copy procedure relates classical asymptotically-flat gravitational field solutions to Yang-Mills and scalar field solutions living in Minkowski space. In this…
Conformal solids and holography
A. Esposito, S. Garcia-Saenz, A. Nicolis +1
We argue that a magnetic monopole in an asymptotically AdS space-time is dual to a -dimensional strongly coupled system in a solid state. In light of this, it would be r…
Mutual Interactions of Phonons, Rotons, and Gravity
Alberto Nicolis, Riccardo Penco
We introduce an effective point-particle action for generic particles living in a zero-temperature superfluid. This action describes the motion of the particles in the medium at eq…
A Modern Approach to Superradiance
Solomon Endlich, Riccardo Penco
In this paper, we provide a simple and modern discussion of rotational superradiance based on quantum field theory. We work with an effective theory valid at scales much larger tha…
First Sound in Holographic Superfluids at Zero Temperature
Angelo Esposito, Sebastian Garcia-Saenz, Riccardo Penco
Within the context of AdS/CFT, the gravity dual of an s-wave superfluid is given by scalar QED on an asymptotically AdS spacetime. While this conclusion is vastly supported by nume…
Effective string theory for vortex lines in fluids and superfluids
Bart Horn, Alberto Nicolis, Riccardo Penco
We discuss the effective string theory of vortex lines in ordinary fluids and low-temperature superfluids, by describing the bulk fluid flow in terms of a two-form field to which v…