279 citations · 2.4k across the 48 of their papers we have counts for
29 papers · 1 filter
Layered Wire-Grid Haloscope for Millielectronvolt Axions and Dark Photons
Andrea Caputo
We propose MADGRID (Millielectronvolt Axions and Dark photons with layered GRIDs), a few wire grids in front of a mirror, tuned by their spacing, forming an epsilon-near-zero slab…
Resonant Conversion of Wave Dark Matter in the Ionosphere
Carl Beadle, Andrea Caputo, Sebastian A. R. Ellis
We consider resonant wave-like dark matter conversion into low-frequency radio waves in the Earth's ionosphere. Resonant conversion occurs when the dark matter mass and the plasma…
Pulsar Nulling and Vacuum Radio Emission from Axion Clouds
Andrea Caputo, Samuel J. Witte, Alexander A. Philippov +1
Non-relativistic axions can be efficiently produced in in the polar caps of pulsars, resulting in the formation of a dense cloud of gravitationally bound axions. Here, we investiga…
A new source for light dark matter isocurvature in low scale inflation
Andrea Caputo, Michael Geller, Giuseppe Rossi
Light scalar and pseudoscalar particles are compelling dark matter candidates, with a vast running experimental program to discover them. Previous studies have shown that these lig…
Stellar limits on scalars from electron-nucleus bremsstrahlung
Salvatore Bottaro, Andrea Caputo, Georg Raffelt +1
We revisit stellar energy-loss bounds on the Yukawa couplings of baryophilic and leptophilic scalars . The white-dwarf luminosity function yields $g_{\rm B}\lesssi…
Dark Matter prospects with COSI: ALPs, PBHs and sub-GeV Dark Matter
Andrea Caputo, Michela Negro, Marco Regis +1
We study the prospects in the search of dark matter offered by the newly selected NASA MeV mission COSI (Compton Spectrometer and Imager). This instrument is designed and optimized…
Hints of dark photon dark matter from observations and hydrodynamical simulations of the low-redshift Lyman- forest
James S. Bolton, Andrea Caputo, Hongwan Liu +1
Recent work has suggested that an additional per baryon of heating in the intergalactic medium is needed to reconcile hydrodynamical simulations with Lyma…
Dark photon superradiance quenched by dark matter
Enrico Cannizzaro, Laura Sberna, Andrea Caputo +1
Black-hole superradiance has been used to place very strong bounds on a variety of models of ultralight bosons such as axions, new light scalars, and dark photons. It is common lor…
A Stimulating Explanation of the Extragalactic Radio Background
Andrea Caputo, Hongwan Liu, Siddharth Mishra-Sharma +2
Despite an intense theoretical and experimental effort over the past decade, observations of the extragalactic radio background at multiple frequencies below 10 GHz are not underst…
Muonic Boson Limits: Supernova Redux
Andrea Caputo, Georg Raffelt, Edoardo Vitagliano
We derive supernova (SN) bounds on muon-philic bosons, taking advantage of the recent emergence of muonic SN models. Our main innovations are to consider scalars in addition to…
Dark photon limits: a handbook
Andrea Caputo, Alexander J. Millar, Ciaran A. J. O'Hare +1
The dark photon is a massive hypothetical particle that interacts with the Standard Model by kinetically mixing with the visible photon. For small values of the mixing parameter, d…
Axion-like Particles from Hypernovae
Andrea Caputo, Pierluca Carenza, Giuseppe Lucente +5
It was recently pointed out that very energetic subclasses of supernovae (SNe), like hypernovae and superluminous SNe, might host ultra-strong magnetic fields in their core. Such f…
Detecting the radiative decay of the cosmic neutrino background with line-intensity mapping
José Luis Bernal, Andrea Caputo, Francisco Villaescusa-Navarro +1
We study the possibility to use line-intensity mapping (LIM) to seek photons from the radiative decay of neutrinos in the cosmic neutrino background. The Standard Model prediction…
Electromagnetic Signatures of Dark Photon Superradiance
Andrea Caputo, Samuel J. Witte, Diego Blas +1
Black hole superradiance is a powerful tool in the search for ultra-light bosons. Constraints on the existence of such particles have been derived from the observation of highly sp…
Directional detection of light dark matter from three-phonon events in superfluid He
Andrea Caputo, Angelo Esposito, Fulvio Piccinini +2
We present the analysis of a new signature for light dark matter detection with superfluid He: the emission of three phonons. We show that, in a region of mass below the MeV, t…
The see-saw portal at future Higgs Factories
Daniele Barducci, Enrico Bertuzzo, Andrea Caputo +2
We consider an extension of the Standard Model with two right-handed singlet fermions with mass at the electroweak scale that induce neutrino masses, plus a generic new physics sec…
Revisiting longitudinal plasmon-axion conversion in external magnetic fields
Andrea Caputo, Alexander J. Millar, Edoardo Vitagliano
In the presence of an external magnetic field the axion and the photon mix. In particular, the dispersion relation of a longitudinal plasmon always crosses the dispersion relation…
Exploring New Physics with O(keV) Electron Recoils in Direct Detection Experiments
Itay M. Bloch, Andrea Caputo, Rouven Essig +3
Motivated by the recent XENON1T results, we explore various new physics models that can be discovered through searches for electron recoils in O(keV)-threshold direct-detection exp…
Minimal flavor violation in the see-saw portal
Daniele Barducci, Enrico Bertuzzo, Andrea Caputo +1
We consider an extension of the Standard Model with two singlet leptons, with masses in the electroweak range, that induce neutrino masses via the see-saw mechanism, plus a generic…
Light Dark Matter and Superfluid He-4 from EFT
Andrea Caputo, Angelo Esposito, Antonio D. Polosa
We study the response of a He-4 detector to the interaction of sub-GeV dark matter using an effective field theory for the superfluid. We compute the lifetime of the phonon, which…
Dark Matter, Dark Photon and Superfluid He-4 from Effective Field Theory
A. Caputo, A. Esposito, E. Geoffray +2
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…
No chiral light bending by clumps of axion-like particles
Diego Blas, Andrea Caputo, Mikhail M. Ivanov +1
We study the propagation of light in the presence of a parity-violating coupling between photons and axion-like particles (ALPs). Naively, this interaction could lead to a split of…
Sub-MeV Dark Matter and the Goldstone Modes of Superfluid Helium
Andrea Caputo, Angelo Esposito, Antonio D. Polosa
We show how the relativistic effective field theory for the superfluid phase of helium-4 can replace the standard methods used to compute the production rates of low momentum excit…
Cosmic implications of a low-scale solution to the axion domain wall problem
Andrea Caputo, Mario Reig
The post-inflationary breaking of Peccei-Quinn (PQ) symmetry can lead to the cosmic domain wall catastrophe. In this Letter we show how to avoid domain walls implementing the Insta…