105 citations · 581 across the 24 of their papers we have counts for
18 papers · 1 filter
A Unified Numerical Study of Axion Stars: From the Nonrelativistic Regime to General Relativity
Parisa Arabameri, Paola Arias, Francisco Colipí-Marchant +1
Axion-star mass-radius relations are commonly computed using different orders of relativistic approximation, making it important to determine where these descriptions remain reliab…
Multi-messenger signal from QCD-Axion Ultracompact Minihalos
Dorian W. P. Amaral, Enrico D. Schiappacasse, Karla Tapia-Rebolledo
We explore the multimessenger signatures from ultracompact minihalos (UCMHs) seeded by stellar-mass primordial black holes (PBHs) and composed of QCD-axion dark matter. Using the s…
Dipole Radiation and Kinetic Mixing from Dark Photon Solitons
Enrico D. Schiappacasse, Moira Venegas
Wave-like dark matter composed of spin-1 particles, known as dark photons, is theorized to form clumps called "vector solitons". These solitons are compact astrophysical objects th…
Constraining Dark Photon Dark Matter with Radio Silence from Soliton Mergers around Supermassive Black Holes
Dorian W. P. Amaral, Enrico D. Schiappacasse, Hong-Yi Zhang
We place the first constraints on the dark matter fraction contained within dark photon solitons using the absence of their predicted radio-frequency signatures, or radio silence,…
Dark photon dark matter from flattened axion potentials
Hong-Yi Zhang, Paola Arias, Andrew Cheek +3
Dark photons can be resonantly produced in the early universe via their coupling to an oscillating axion field. However, this mechanism typically requires large axion--dark photon…
Dark Spin-2 Field Solitons as a Source of Electromagnetic Radiation
Enrico D. Schiappacasse
Spin- light dark boson particles can exhibit wave-like behavior, capable of forming long-lived, coherent, spatially localized structures known as solitons. This work considers t…
Resonant conversion of axion dark radiation into terahertz electromagnetic radiation in a neutron star magnetosphere
Andrew J. Long, Enrico D. Schiappacasse
In the strong magnetic field of a neutron star's magnetosphere, axions coupled to electromagnetism develop a nonzero probability to convert into photons. Past studies have revealed…
Rescuing The Primordial Black Holes all-Dark Matter Hypothesis from The Fast Radio Bursts Tension
Dorian W. P. Amaral, Enrico D. Schiappacasse
Primordial black holes (PBHs) as an all-dark matter (DM) hypothesis has recently been demotivated by the prediction that these objects would source an excessive rate of fast radio…
Photons from dark photon solitons via parametric resonance
Mustafa A. Amin, Andrew J. Long, Enrico D. Schiappacasse
Wave-like dark matter made of spin-1 particles (dark photons) is expected to form ground state clumps called "vector solitons", which can have different polarizations. In this work…
PBH assisted search for QCD axion dark matter
Gongjun Choi, Enrico D. Schiappacasse
The entropy production prior to BBN era is one of ways to prevent QCD axion with the decay constant from overclosing the universe when…
Can QCD Axion Stars explain Subaru HSC microlensing?
Enrico D. Schiappacasse, Tsutomu T. Yanagida
A non-negligible fraction of the QCD axion dark matter may form gravitationally bound Bose Einstein condensates, which are commonly known as axion stars or axion clumps. Such astro…
Microlensing constraints on axion stars including finite lens and source size effects
Kohei Fujikura, Mark P. Hertzberg, Enrico D. Schiappacasse +1
A fraction of light scalar dark matter, especially axions, may organize into Bose-Einstein condensates, gravitationally bound clumps, "boson stars", and be present in large number…
Radio signatures from encounters between Neutron Stars and QCD-Axion Minihalos around Primordial Black Holes
Sami Nurmi, Enrico D. Schiappacasse, Tsutomu T. Yanagida
Probing the QCD axion dark matter (DM) hypothesis is extremely challenging as the axion interacts very weakly with Standard Model particles. We propose a new avenue to test the QCD…
Shining Primordial Black Holes
Mark P. Hertzberg, Sami Nurmi, Enrico D. Schiappacasse +1
We study the well-motivated mixed dark matter (DM) scenario composed of a dominant thermal WIMP, highlighting the case of triplet fermion "winos", with a small fraction o…
Merger of Dark Matter Axion Clumps and Resonant Photon Emission
Mark P. Hertzberg, Yao Li, Enrico D. Schiappacasse
A portion of light scalar dark matter, especially axions, may organize into gravitationally bound clumps (stars) and be present in large number in the galaxy today. It is therefore…
Dark Matter Axion Clump Resonance of Photons
Mark P. Hertzberg, Enrico D. Schiappacasse
Recently there has been interest in the physical properties of dark matter axion condensates. Due to gravitational attraction and self-interactions, they can organize into spatial…
Scalar Dark Matter Clumps with Angular Momentum
Mark P. Hertzberg, Enrico D. Schiappacasse
The behavior of light scalar dark matter has been a subject of much interest recently as it can lead to interesting small scale behavior. In particular, this can lead to the format…
Analysis of Dark Matter Axion Clumps with Spherical Symmetry
Enrico D. Schiappacasse, Mark P. Hertzberg
Recently there has been much interest in the spatial distribution of light scalar dark matter, especially axions, throughout the universe. When the local gravitational interactions…