Publications (21)
Anomaly Ratio Distributions of Hadronic Axion Models with Multiple Heavy Quarks
Vaisakh Plakkot, Sebastian Hoof
We consider hadronic axion models that extend the Standard Model by one complex scalar field and one or more new heavy quarks, i.e. . We review previously sug…
Axion Quasiparticles for Axion Dark Matter Detection
Jan Schütte-Engel, David J. E. Marsh, Alexander J. Millar +7
It has been suggested that certain antiferromagnetic topological insulators contain axion quasiparticles (AQs), and that such materials could be used to detect axion dark matter (D…
Enhanced quality factors and force sensitivity by attaching magnetic beads to cantilevers for atomic force microscopy in liquid
Sebastian Hoof, Nitya Nand Gosvami, Bart W. Hoogenboom
Dynamic-mode atomic force microscopy (AFM) in liquid remains complicated due to the strong viscous damping of the cantilever resonance. Here we show that a high-quality resonance (…
A Global Analysis of Dark Matter Signals from 27 Dwarf Spheroidal Galaxies using 11 Years of Fermi-LAT Observations
Sebastian Hoof, Alex Geringer-Sameth, Roberto Trotta
We search for a dark matter signal in 11 years of Fermi-LAT gamma-ray data from 27 Milky Way dwarf spheroidal galaxies with spectroscopically measured -factors. Our analysis inc…
Astrophysical Searches and Constraints on Ultralight Bosonic Dark Matter
David J. E. Marsh, Sebastian Hoof
Starting from the evidence that dark matter indeed exists and permeates the entire cosmos, various bounds on its properties can be estimated. Beginning with the cosmic microwave ba…
Catalogues of Cosmologically Self-Consistent Hadronic QCD Axion Models
Luca Di Luzio, Sebastian Hoof, Coenraad Marinissen +1
We extend the catalogue of "phenomenologically preferred" hadronic axion models to include heavy fermion representations associated with higher-dimensional decay operators. The lat…
Structure Formation Models Weaken Limits on WIMP Dark Matter from Dwarf Spheroidal Galaxies
Shin'ichiro Ando, Alex Geringer-Sameth, Nagisa Hiroshima +3
Dwarf spheroidal galaxies that form in halo substructures provide stringent constraints on dark matter annihilation. Many ultrafaint dwarfs discovered with modern surveys contribut…
Updated constraints on axion-like particles from temporal information in supernova SN1987A gamma-ray data
Sebastian Hoof, Lena Schulz
We revise gamma-ray limits on axion-like particles (ALPs) emitted from supernova SN1987A based on Solar Maximum Mission data. We improve and simplify the computation of the expecte…
Axion Helioscopes as Solar Thermometers
Sebastian Hoof, Joerg Jaeckel, Lennert J. Thormaehlen
Axions, if discovered, could serve as a powerful new messenger for studying astrophysical objects. In this study we show how the Sun's spatial and spectral "axion image" can be inv…
Getting More Out of Black Hole Superradiance: a Statistically Rigorous Approach to Ultralight Boson Constraints from Black Hole Spin Measurements
Sebastian Hoof, David J. E. Marsh, Júlia Sisk-Reynés +2
Black hole (BH) superradiance can provide strong constraints on the properties of ultralight bosons (ULBs). While most of the previous work has focused on the theoretical predictio…
Ultimate light-shining-through-a-wall experiments to establish QCD axions as the dominant form of dark matter
Sebastian Hoof, Joerg Jaeckel, Giuseppe Lucente
Establishing the axion as the dark matter (DM) particle after a haloscope discovery typically requires follow-up experiments to break the degeneracy between the axion's coupling to…
Nested sampling for frequentist computation: fast estimation of small -values
Andrew Fowlie, Sebastian Hoof, Will Handley
We propose a novel method for computing -values based on nested sampling (NS) applied to the sampling space rather than the parameter space of the problem, in contrast to its us…
Global fits of axion-like particles to XENON1T and astrophysical data
Peter Athron, Csaba Balázs, Ankit Beniwal +13
The excess of electron recoil events seen by the XENON1T experiment has been interpreted as a potential signal of axion-like particles (ALPs), either produced in the Sun, or consti…
Statistical Uncertainties of the QCD Axion Mass Window from Topological Defects
Sebastian Hoof, Jana Riess, David J. E. Marsh
We review results from QCD axion string and domain wall simulations and propagate the associated uncertainties, including QCD uncertainties, into the calculation of the axion relic…
Quantifying uncertainties in the solar axion flux and their impact on determining axion model parameters
Sebastian Hoof, Joerg Jaeckel, Lennert J. Thormaehlen
We review the calculation of the solar axion flux from axion-photon and axion-electron interactions and discuss the size of various effects neglected in current calculations. For t…
CosmoBit: A GAMBIT module for computing cosmological observables and likelihoods
The GAMBIT Cosmology Workgroup, :, Janina J. Renk +13
We introduce , a module within the open-source software framework for exploring connections between cosmology and particle physics with joint global fi…
QCD axions and axionlike particles in a two-inflation scenario
Sebastian Hoof, Joerg Jaeckel
We investigate the phenomenology of QCD axions and axionlike particles in a scenario with two eras of inflation. In particular, we describe the possible solutions for the QCD axion…
Axion global fits with Peccei-Quinn symmetry breaking before inflation using GAMBIT
Sebastian Hoof, Felix Kahlhoefer, Pat Scott +2
We present global fits of cosmologically stable axion-like particle and QCD axion models in the mass range 0.1 neV to 10 eV. We focus on the case where the Peccei-Quinn symmetry is…
Simple and statistically sound recommendations for analysing physical theories
Shehu S. AbdusSalam, Fruzsina J. Agocs, Benjamin C. Allanach +72
Physical theories that depend on many parameters or are tested against data from many different experiments pose unique challenges to statistical inference. Many models in particle…
A Preview of Global Fits of Axion Models in GAMBIT
Sebastian Hoof
There are currently many experimental searches underway that try to detect QCD axions and axion-like particles. These, in addition to other constraints from astrophysics and cosmol…
Cosmological constraints on decaying axion-like particles: a global analysis
Csaba Balázs, Sanjay Bloor, Tomás E. Gonzalo +8
Axion-like particles (ALPs) decaying into photons are known to affect a wide range of astrophysical and cosmological observables. In this study we focus on ALPs with masses in the…