Peter W. Graham
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View article: Revisiting isocurvature bounds on the minimal QCD axion
Revisiting isocurvature bounds on the minimal QCD axion Open
A bstract The QCD axion has important connections to early universe cosmology. For example, it is often said that isocurvature limits rule out a combination of high axion decay constant, f a , and high inflationary Hubble scale, H I . High…
View article: Detecting White Dwarf Binary Mergers with Gravitational Waves
Detecting White Dwarf Binary Mergers with Gravitational Waves Open
Mergers of white dwarf binaries are a possible progenitor channel for Type Ia supernovae. While white dwarfs are abundant in the universe and relatively well understood, their gravitational wave signals have not yet been directly observed.…
View article: Robust bounds on MACHOs from the faintest galaxies
Robust bounds on MACHOs from the faintest galaxies Open
We use the dynamical heating of stars in ultrafaint dwarf (UFD) galaxies to set limits on Massive Compact Halo Objects (MACHOs). In our analysis we study the robustness of the bounds under uncertainties in key UFD parameters, such as the h…
View article: Electromagnetic modeling and science reach of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mtext>DMRadio-</mml:mtext><mml:msup><mml:mrow><mml:mi mathvariant="normal">m</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>
Electromagnetic modeling and science reach of Open
DMRadio-m3 is an experimental search for dark matter axions. It uses a solenoidal dc magnetic field to convert an axion dark-matter signal to an ac electromagnetic response in a coaxial copper pickup. The current induced by this axion sign…
View article: Revisiting Isocurvature Bounds on the Minimal QCD Axion
Revisiting Isocurvature Bounds on the Minimal QCD Axion Open
The QCD axion has important connections to early universe cosmology. For example, it is often said that isocurvature limits rule out a combination of high axion decay constant, $f_a$, and high inflationary Hubble scale, $H_I$. High scales …
View article: Status of the Proton EDM Experiment (pEDM)
Status of the Proton EDM Experiment (pEDM) Open
The Proton EDM Experiment (pEDM) is the first direct search for the proton electric dipole moment (EDM) with the aim of being the first experiment to probe the Standard Model (SM) prediction of any particle EDM. Phase-I of pEDM will achiev…
View article: Highly excited electron cyclotron for QCD axion and dark-photon detection
Highly excited electron cyclotron for QCD axion and dark-photon detection Open
We propose using highly excited cyclotron states of a trapped electron to detect meV axion and dark-photon dark matter, marking a significant improvement over our previous proposal and demonstration [One-electron quantum cyclotron as a mil…
View article: Electromagnetic modeling and science reach of DMRadio-m3 -- Scan Rate
Electromagnetic modeling and science reach of DMRadio-m3 -- Scan Rate Open
Simulated scan rate for DMRadio-m3 as shown in Figure 4a of https://arxiv.org/abs/2302.14084. Scan rate shown in MHz/yr in intervals of 1 MHz assumes KSVZ coupling in the 10-30 MHz range, and DFSZ coupling in the 30-200 MHz. Results calcul…
View article: Constraints on long-ranged interactions between dark matter and the Standard Model
Constraints on long-ranged interactions between dark matter and the Standard Model Open
Dark matter's existence is known thanks to its gravitational interaction with Standard Model particles, but it remains unknown whether this is the only force present between them. While many searches for such new interactions with dark mat…
View article: Enhancing direct detection of Higgsino dark matter
Enhancing direct detection of Higgsino dark matter Open
While much supersymmetric weakly interacting massive particle (WIMP) parameter space has been ruled out, one remaining important candidate is Higgsino dark matter. The Higgsino can naturally realize the “inelastic dark matter” scenario, wh…
View article: Constraints on dark matter from dynamical heating of stars in ultrafaint dwarfs. I. MACHOs and primordial black holes
Constraints on dark matter from dynamical heating of stars in ultrafaint dwarfs. I. MACHOs and primordial black holes Open
We place limits on dark matter made up of compact objects significantly heavier than a solar mass, such as MACHOs or primordial black holes (PBHs). In galaxies, the gas of such objects is generally hotter than the gas of stars and will thu…
View article: Constraints on dark matter from dynamical heating of stars in ultrafaint dwarfs. II. Substructure and the primordial power spectrum
Constraints on dark matter from dynamical heating of stars in ultrafaint dwarfs. II. Substructure and the primordial power spectrum Open
There is a large and growing interest in observations of small-scale structure in dark matter. We propose a new way to probe dark matter structures in the ∼10–108M⊙ range. This allows us to constrain the primordial power spectrum over shor…
View article: Constraints on Long-Ranged Interactions Between Dark Matter and the Standard Model
Constraints on Long-Ranged Interactions Between Dark Matter and the Standard Model Open
Dark matter's existence is known thanks to its gravitational interaction with Standard Model particles, but it remains unknown whether this is the only force present between them. While many searches for such new interactions with dark mat…
View article: Highly Excited Electron Cyclotron for QCD Axion and Dark-Photon Detection
Highly Excited Electron Cyclotron for QCD Axion and Dark-Photon Detection Open
We propose using highly excited cyclotron states of a trapped electron to detect meV axion and dark photon dark matter, marking a significant improvement over our previous proposal and demonstration [Phys. Rev. Lett. 129, 261801]. When the…
View article: Enhancing Direct Detection of Higgsino Dark Matter
Enhancing Direct Detection of Higgsino Dark Matter Open
While much supersymmetric weakly interacting massive particle (WIMP) parameter space has been ruled out, one remaining important candidate is Higgsino dark matter. The Higgsino can naturally realize the "inelastic dark matter" scenario, wh…
View article: Constraints on Dark Matter from Dynamical Heating of Stars in Ultrafaint Dwarfs. Part 2: Substructure and the Primordial Power Spectrum
Constraints on Dark Matter from Dynamical Heating of Stars in Ultrafaint Dwarfs. Part 2: Substructure and the Primordial Power Spectrum Open
There is a large and growing interest in observations of small-scale structure in dark matter. We propose a new way to probe dark matter structures in the $\sim 10 - 10^8 \, M_\odot$ range. This allows us to constrain the primordial power …
View article: Hunt for magnetic signatures of hidden-photon and axion dark matter in the wilderness
Hunt for magnetic signatures of hidden-photon and axion dark matter in the wilderness Open
Earth can act as a transducer to convert ultralight bosonic dark matter (axions and hidden photons) into an oscillating magnetic field with a characteristic pattern across its surface. Here we describe the first results of a dedicated expe…
View article: Coherent Self-Interactions of Dark Matter in the Bullet Cluster
Coherent Self-Interactions of Dark Matter in the Bullet Cluster Open
Many models of dark matter include self-interactions beyond gravity. A variety of astrophysical observations have previously been used to place limits on the strength of such self-interactions. However, previous works have generally focuse…
View article: Constraints on Dark Matter from Dynamical Heating of Stars in Ultrafaint Dwarfs. Part 1: MACHOs and Primordial Black Holes
Constraints on Dark Matter from Dynamical Heating of Stars in Ultrafaint Dwarfs. Part 1: MACHOs and Primordial Black Holes Open
We place limits on dark matter made up of compact objects significantly heavier than a solar mass, such as MACHOs or primordial black holes (PBHs). In galaxies, the gas of such objects is generally hotter than the gas of stars and will thu…
View article: Quantum Sensors for High Energy Physics
Quantum Sensors for High Energy Physics Open
Strong motivation for investing in quantum sensing arises from the need to investigate phenomena that are very weakly coupled to the matter and fields well described by the Standard Model. These can be related to the problems of dark matte…
View article: Erratum: Minimal warm inflation
Erratum: Minimal warm inflation Open
We correct several minor mistakes in equations in section 4.1 and update the viable parameter range of the model quoted in section 4.2 accordingly.
View article: Gravitational Wave Measurement in the Mid-Band with Atom Interferometers
Gravitational Wave Measurement in the Mid-Band with Atom Interferometers Open
Gravitational Waves (GWs) have been detected in the $\sim$100 Hz and nHz bands, but most of the gravitational spectrum remains unobserved. A variety of detector concepts have been proposed to expand the range of observable frequencies. In …
View article: Detecting nanometer-scale new forces with coherent neutron scattering
Detecting nanometer-scale new forces with coherent neutron scattering Open
Significant effort has been devoted to searching for new fundamental forces of nature. At short length scales (below approximately 10 nm), the strongest experimental constraints come from neutron scattering from individual nuclei in gases.…
View article: A Hunt for Magnetic Signatures of Hidden-Photon and Axion Dark Matter in the Wilderness
A Hunt for Magnetic Signatures of Hidden-Photon and Axion Dark Matter in the Wilderness Open
Earth can act as a transducer to convert ultralight bosonic dark matter (axions and hidden photons) into an oscillating magnetic field with a characteristic pattern across its surface. Here we describe the first results of a dedicated expe…
View article: Detecting Nanometer-Scale New Forces with Coherent Neutron Scattering
Detecting Nanometer-Scale New Forces with Coherent Neutron Scattering Open
Significant effort has been devoted to searching for new fundamental forces of nature. At short length scales (below approximately 10 nm), the strongest experimental constraints come from neutron scattering from individual nuclei in gases.…
View article: One-Electron Quantum Cyclotron as a Milli-eV Dark-Photon Detector
One-Electron Quantum Cyclotron as a Milli-eV Dark-Photon Detector Open
We propose using trapped electrons as high-Q resonators for detecting meV dark photon dark matter. When the rest energy of the dark photon matches the energy splitting of the two lowest cyclotron levels, the first excited state of the elec…
View article: Proposal for a definitive search for GUT-scale QCD axions
Proposal for a definitive search for GUT-scale QCD axions Open
The QCD axion is a leading dark matter candidate that emerges as part of the solution to the strong CP problem in the Standard Model. The coupling of the axion to photons is the most common experimental probe, but much parameter space rema…
View article: Projected sensitivity of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mtext>DMRadio-m</mml:mtext></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>: A search for the QCD axion below <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mn>1</mml:mn><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:mi mathvariant="normal">μ</mml:mi><mml:mi>eV</mml:mi></mml:mrow></mml:math>
Projected sensitivity of : A search for the QCD axion below Open
The QCD axion is one of the most compelling candidates to explain the dark matter abundance of the Universe. With its extremely small mass ($\\ll$1 eV=c2), axion dark matter interacts as a classical field rather than a particle.…
View article: Searching for dark clumps with gravitational-wave detectors
Searching for dark clumps with gravitational-wave detectors Open
Dark compact objects ("clumps") transiting the Solar System exert accelerations on the test masses (TM) in a gravitational-wave (GW) detector. We reexamine the detectability of these clump transits in a variety of current and future GW det…
View article: One-Electron Quantum Cyclotron as a Milli-eV Dark-Photon Detector
One-Electron Quantum Cyclotron as a Milli-eV Dark-Photon Detector Open
We propose using trapped electrons as high-$Q$ resonators for detecting meV dark photon dark matter. When the rest energy of the dark photon matches the energy splitting of the two lowest cyclotron levels, the first excited state of the el…