Andreas Ringwald
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View article: Complete Gravitational-Wave Spectrum of the Sun
Complete Gravitational-Wave Spectrum of the Sun Open
The high-temperature plasma in the solar interior generates stochastic gravitational waves (GWs). Owing to its significance as the primary source of high-frequency GWs in the Solar System, we reexamine this phenomenon by highlighting some …
View article: High frequency gravitational wave plotter: Stochastic signals
High frequency gravitational wave plotter: Stochastic signals Open
HFGWplotter_Omega: Gravitational Waves Plotter for stochastic signals and power-law-integrated sensitivities Created by Francesco Muia, Andreas Ringwald and Carlos Tamarit. Code maintained by Carlos Tamarit Credit for the data of the plots…
View article: Polarimetric searches for axion dark matter and high-frequency gravitational waves using optical cavities
Polarimetric searches for axion dark matter and high-frequency gravitational waves using optical cavities Open
We revisit birefringence effects associated with the evolution of the polarization of light as it propagates through axion dark matter or the background of a passing gravitational wave (GW). We demonstrate that this can be described by a u…
View article: The International Axion Observatory (IAXO): case, status and plans. Input to the European Strategy for Particle Physics
The International Axion Observatory (IAXO): case, status and plans. Input to the European Strategy for Particle Physics Open
The International Axion Observatory (IAXO) is a next-generation axion helioscope designed to search for solar axions with unprecedented sensitivity. IAXO holds a unique position in the global landscape of axion searches, as it will probe a…
View article: Polarimetric searches for axion dark matter and high-frequency gravitational waves using optical cavities
Polarimetric searches for axion dark matter and high-frequency gravitational waves using optical cavities Open
We revisit birefringence effects associated with the evolution of the polarization of light as it propagates through axion dark matter or the background of a passing gravitational wave (GW). We demonstrate that this can be described by a u…
View article: Complete Gravitational-Wave Spectrum of the Sun
Complete Gravitational-Wave Spectrum of the Sun Open
The high-temperature plasma in the solar interior generates stochastic gravitational waves (GWs). Due to its significance as the primary source of high-frequency GWs in the solar system, we reexamine this phenomenon highlighting some physi…
View article: Review on Axions
Review on Axions Open
This proceedings' contribution explores the rationale behind the axion as a resolution to the strong CP puzzle. It outlines various benchmark axion models and examines their implications, focusing on two key aspects: (i) the axion's intera…
View article: Axion dark matter (theory & experiment)
Axion dark matter (theory & experiment) Open
We review the motivation for the axion as a solution of the strong CP puzzle and as a candidate for cold dark matter. Then we discuss benchmark axion models and present their predictions concerning axion couplings to the Standard Model and…
View article: First mechanical realization of a tunable dielectric haloscope for the MADMAX axion search experiment
First mechanical realization of a tunable dielectric haloscope for the MADMAX axion search experiment Open
MADMAX, a future experiment to search for axion dark matter,is based on a novel detection concept called the dielectrichaloscope. It consists of a booster composed of several dielectricdisks positioned with μm precision. A prototype compos…
View article: Generic Axion Maxwell Equations: Path Integral Approach
Generic Axion Maxwell Equations: Path Integral Approach Open
The low energy interactions between axions and electromagnetic fields that arise in models with heavy dyons charged under a spontaneously broken global axial U (1) symmetry are derived using the path integral approach. Hence, generic axion…
View article: Searching for GUT-scale QCD axions and monopoles with a high-voltage capacitor
Searching for GUT-scale QCD axions and monopoles with a high-voltage capacitor Open
The QCD axion has been postulated to exist because it solves the strong-CP problem. Furthermore, if it exists axions should be created in the early Universe and could account for all the observed dark matter. In particular, axion masses of…
View article: Searching for GUT-scale QCD Axions and Monopoles with a High Voltage Capacitor
Searching for GUT-scale QCD Axions and Monopoles with a High Voltage Capacitor Open
The QCD axion has been postulated to exist because it solves the strong CP problem. Furthermore, if it exists axions should be created in the early Universe and could account for all the observed dark matter. In particular, axion masses of…
View article: Sensitivity of Resonant Axion Haloscopes to Quantum Electromagnetodynamics
Sensitivity of Resonant Axion Haloscopes to Quantum Electromagnetodynamics Open
Recently, interactions between putative axions and magnetic monopoles have been revisited by two of the authors.[1] It is shown that significant modifications to conventional axion electrodynamics arise due to these interactions, so that t…
View article: Sensitivity of Resonant Axion Haloscopes to Quantum Electromagnetodynamics
Sensitivity of Resonant Axion Haloscopes to Quantum Electromagnetodynamics Open
Recently interactions between putative axions and magnetic monopoles have been revisited by two of us [arXiv:2205.02605 [hep-ph]]. It has been shown that significant modifications to conventional axion electrodynamics arise due to these in…
View article: Generic axion Maxwell equations: path integral approach
Generic axion Maxwell equations: path integral approach Open
Using the path integral approach, we derive the low energy interactions between axions and electromagnetic field that arise in models with heavy dyons charged under a spontaneously broken global axial $U(1)$ symmetry. Hence, we obtain gene…
View article: Axion dark matter (theory & experiment)
Axion dark matter (theory & experiment) Open
We review the motivation for the axion as a solution of the strong CP puzzle and as a candidate for cold dark matter. Then we discuss benchmark axion models and present their predictions concerning axion couplings to the Standard Model and…
View article: Inflation and Higgs Phenomenology in a Model Unifying the DFSZ Axion with the Majoron
Inflation and Higgs Phenomenology in a Model Unifying the DFSZ Axion with the Majoron Open
The Two-Higgs-Doublet-Standard Model-Axion-Seesaw-Higgs-Portal inflation (2hdSMASH) model consisting of two Higgs doublets, a Standard Model (SM) singlet complex scalar and three SM singlet right-handed neutrinos can embed axion dark matte…
View article: Prospects to scrutinise or smash SM*A*S*H
Prospects to scrutinise or smash SM*A*S*H Open
SM*A*S*H is an extension of the Standard Model of particle physics which has just the minimal number of fields in order to solve six puzzles of particle physics and cosmology in one smash: vacuum stability, inflation, baryon asymmetry, neu…
View article: Revealing the cosmic history with gravitational waves
Revealing the cosmic history with gravitational waves Open
The characteristics of the cosmic microwave background provide circumstantial evidence that the hot radiation-dominated epoch in the early universe was preceded by a period of inflationary expansion. Here, we show how a measurement of the …
View article: Electromagnetic Couplings of Axions
Electromagnetic Couplings of Axions Open
We show that, contrary to assertions in the literature, the main contribution to the axion-photon coupling need not be quantized in the units proportional to $e^2$. In particular, we discuss a loophole in the argument for this quantization…
View article: Snowmass2021 Theory Frontier: Theory Meets the Lab
Snowmass2021 Theory Frontier: Theory Meets the Lab Open
We review how theorists have been instrumental in launching and developing new experiments in the last decade, and comment on the challenges and opportunities for this program to continue to thrive going forward. This whitepaper is a solic…
View article: Snowmass2021 Theory Frontier: Theory Meets the Lab
Snowmass2021 Theory Frontier: Theory Meets the Lab Open
We review how theorists have been instrumental in launching and developing new experiments in the last decade, and comment on the challenges and opportunities for this program to continue to thrive going forward. This whitepaper is a solic…
View article: An exceptionally light axion: Strong CP and Dark Matter
An exceptionally light axion: Strong CP and Dark Matter Open
We explore whether the axion which solves the strong CP problem can naturally be much lighter than the canonical QCD axion. The $Z_\\mathcal{N}$ symmetry proposed by Hook, with $\\mathcal{N}$ mirror and degenerate worlds coexisting in Natu…
View article: Revealing the cosmic history with gravitational waves
Revealing the cosmic history with gravitational waves Open
The characteristics of the cosmic microwave background provide circumstantial evidence that the hot radiation-dominated epoch in the early Universe was preceded by a period of inflationary expansion. Here, we show how a measurement of the …
View article: Magnetic anomaly coefficients for QCD axion couplings
Magnetic anomaly coefficients for QCD axion couplings Open
We argue that there are both experimental and theoretical reasons to reconsider the construction of KSVZ-like axion models. From the experimental side, predictions for the axion-photon coupling are not consistent with the collection of ast…
View article: Dark matter from an even lighter QCD axion: trapped misalignment
Dark matter from an even lighter QCD axion: trapped misalignment Open
We show that dark matter can be accounted for by an axion that solves the strong CP problem, but is much lighter than usual due to a $Z_\mathcal{N}$ symmetry. The whole mass range from the canonical QCD axion down to the ultra-light regime…
View article: Simulating MADMAX in 3D: requirements for dielectric axion haloscopes
Simulating MADMAX in 3D: requirements for dielectric axion haloscopes Open
We present 3D calculations for dielectric haloscopes such as the currently envisioned MADMAX experiment. For ideal systems with perfectly flat, parallel and isotropic dielectric disks of finite diameter, we find that a geometrical form fac…