Junwu Huang
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View article: Polarization-shape alignment of IllustrisTNG star-forming galaxies
Polarization-shape alignment of IllustrisTNG star-forming galaxies Open
In star-forming disk galaxies, the radio continuum emission ($1$-$10\,$GHz) powered by star formation has an integrated polarization direction imperfectly aligned with the apparent disk minor axis. This polarization-shape alignment effect …
View article: Dark Matter Haloscope with a Disordered Dielectric Absorber
Dark Matter Haloscope with a Disordered Dielectric Absorber Open
Light dark matter candidates such as axions and dark photons generically couple to electromagnetism, yielding dark-matter-to-photon conversion as a key search strategy. In addition to resonant conversion in cavities and circuits, light dar…
View article: Expanding Ejecta Method: II. Framework for Cosmological Distance Measurements via Intensity Interferometry
Expanding Ejecta Method: II. Framework for Cosmological Distance Measurements via Intensity Interferometry Open
We explore the potential of the expanding ejecta method (EEM) as a cosmological probe, leveraging its ability to measure angular diameter distances to supernovae (SNe) with intensity interferometry. We propose three distinct applications o…
View article: New Probe of Cosmic Birefringence Using Galaxy Polarization and Shapes
New Probe of Cosmic Birefringence Using Galaxy Polarization and Shapes Open
We propose a novel statistical method to measure cosmic birefringence and demonstrate its power in probing parity violation due to axions. Exploiting an empirical correlation between the integrated radio polarization direction of a spiral …
View article: Search for continuous gravitational wave signals from luminous dark photon superradiance clouds with LVK O3 observations
Search for continuous gravitational wave signals from luminous dark photon superradiance clouds with LVK O3 observations Open
Superradiance clouds of kinetically mixed dark photons around spinning black holes can produce observable multimessenger electromagnetic and gravitational wave signals. The cloud generates electric fields of up to a teravolt-per-meter, whi…
View article: Search for continuous gravitational wave signals from luminous dark photon superradiance clouds with LVK O3 observations
Search for continuous gravitational wave signals from luminous dark photon superradiance clouds with LVK O3 observations Open
Superradiance clouds of kinetically-mixed dark photons around spinning black holes can produce observable multi-messenger electromagnetic and gravitational wave signals. The cloud generates electric fields of up to a Teravolt-per-meter, wh…
View article: Searching for string bosenovas with gravitational wave detectors
Searching for string bosenovas with gravitational wave detectors Open
A bstract We study the phenomenology of a string bosenova explosion in vector superradiance clouds around spinning black holes, focusing on the observable consequences in gravitational wave detectors and accelerometers. During the superrad…
View article: Bubble velocities and oscillon precursors in first-order phase transitions
Bubble velocities and oscillon precursors in first-order phase transitions Open
A bstract Metastable ‘false’ vacuum states are an important feature of the Standard Model of particle physics and many theories beyond it. Describing the dynamics of a phase transition out of a false vacuum via the nucleation of bubbles is…
View article: Pi in the Sky: Neutron Stars with Exceptionally Light QCD Axions
Pi in the Sky: Neutron Stars with Exceptionally Light QCD Axions Open
We present a comprehensive study of axion condensed neutron stars that arise in models of an exceptionally light axion that couples to quantum chromodynamics (QCD). These axions solve the strong-charge-parity (CP) problem, but have a mass-…
View article: Dark Photon Limits from Patchy Dark Screening of the Cosmic Microwave Background
Dark Photon Limits from Patchy Dark Screening of the Cosmic Microwave Background Open
Dark photons that kinetically mix with the Standard Model photon give rise to new spectral anisotropies (patchy dark screening) in the cosmic microwave background (CMB) due to conversion of photons to dark photons within large-scale struct…
View article: Constraints on axions from patchy screening of the cosmic microwave background
Constraints on axions from patchy screening of the cosmic microwave background Open
The resonant conversion of cosmic microwave background (CMB) photons into axions within large-scale structure induces an anisotropic spectral distortion in CMB temperature maps. Applying state-of-the-art foreground cleaning techniques to $…
View article: Searching for String Bosenovas with Gravitational Wave Detectors
Searching for String Bosenovas with Gravitational Wave Detectors Open
We study the phenomenology of string bosenova explosions in vector superradiance clouds around spinning black holes, focusing on the observable consequences in gravitational wave detectors and accelerometers. During the growth of the super…
View article: Dark photon limits from patchy dark screening of the cosmic microwave background
Dark photon limits from patchy dark screening of the cosmic microwave background Open
Dark photons that kinetically mix with the Standard Model photon give rise to new spectral anisotropies (patchy dark screening) in the cosmic microwave background (CMB) due to conversion of photons to dark photons within large-scale struct…
View article: Axion-Induced Patchy Screening of the Cosmic Microwave Background
Axion-Induced Patchy Screening of the Cosmic Microwave Background Open
Cosmic Microwave Background (CMB) photons can undergo resonant conversion into axions in the presence of magnetized plasma distributed inside non-linear large-scale structure (LSS). This process leads to axion-induced patchy screening: sec…
View article: A New Probe of Cosmic Birefringence Using Galaxy Polarization and Shapes
A New Probe of Cosmic Birefringence Using Galaxy Polarization and Shapes Open
We propose a novel statistical method to measure cosmic birefringence and demonstrate its power in probing parity violation due to axions. Exploiting an empirical correlation between the integrated radio polarization direction of a spiral …
View article: Patchy screening of the CMB from dark photons
Patchy screening of the CMB from dark photons Open
We study anisotropic (patchy) screening induced by the resonant conversion of cosmic microwave background (CMB) photons into dark-sector massive vector bosons (dark photons) as they cross non-linear large scale structure (LSS). Resonant co…
View article: Patchy Screening of the CMB from Dark Photons
Patchy Screening of the CMB from Dark Photons Open
We study anisotropic (patchy) screening induced by the resonant conversion of cosmic microwave background (CMB) photons into dark-sector massive vector bosons (dark photons) as they cross non-linear large scale structure (LSS). Resonant co…
View article: Dark photon superradiance: Electrodynamics and multimessenger signals
Dark photon superradiance: Electrodynamics and multimessenger signals Open
We study the electrodynamics of a kinetically mixed dark photon cloud that forms through superradiance around a spinning black hole, and design strategies to search for the resulting multimessenger signals. A dark photon superradiance clou…
View article: Dark photon superradiance: Electrodynamics and multimessenger signals
Dark photon superradiance: Electrodynamics and multimessenger signals Open
We study the electrodynamics of a kinetically mixed dark photon cloud that forms through superradiance around a spinning black hole, and design strategies to search for the resulting multimessenger signals. A dark photon superradiance clou…
View article: Dark photon vortex formation and dynamics
Dark photon vortex formation and dynamics Open
A bstract We study the formation and evolution of vortices in U(1) dark photon dark matter and dark photon clouds that arise through black hole superradiance. We show how the production of both longitudinal mode and transverse mode dark ph…
View article: A Mass for the Dual Photon
A Mass for the Dual Photon Open
We explore a novel IR phase of electromagnetism and place constraints on it. The usual IR modification of electromagnetism, the Higgs phase, involves adding a photon mass for the gauge field $A_μ$, which screens electric fields and confine…
View article: First Indirect Detection Constraints on Axions in the Solar Basin
First Indirect Detection Constraints on Axions in the Solar Basin Open
Axions with masses of order keV can be produced in great abundance within the Solar core. The majority of Sun-produced axions escape to infinity, but a small fraction of the flux is produced with speeds below the escape velocity. Over time…
View article: Dark photon vortex formation and dynamics
Dark photon vortex formation and dynamics Open
We study the formation and evolution of vortices in $U(1)$ dark photon dark matter and dark photon clouds that arise through black hole superradiance. We show how the production of both longitudinal mode and transverse mode dark photon dar…
View article: Sign-reversed anomalous Nernst effect in the ferromagnetic Weyl-semimetal Fe$_{3-x}$GeTe$_2$: the role of Fe vacancies
Sign-reversed anomalous Nernst effect in the ferromagnetic Weyl-semimetal Fe$_{3-x}$GeTe$_2$: the role of Fe vacancies Open
Anomalous Nernst effect, as a thermal partner of anomalous Hall effect, is particularly sensitive to the Berry curvature anomaly near the Fermi level, and has been used to probe the topological nature of quantum materials. In this work, we…
View article: New Constraints on Dark Photon Dark Matter with Superconducting Nanowire Detectors in an Optical Haloscope
New Constraints on Dark Photon Dark Matter with Superconducting Nanowire Detectors in an Optical Haloscope Open
Uncovering the nature of dark matter is one of the most important goals of particle physics. Light bosonic particles, such as the dark photon, are well-motivated candidates: they are generally long-lived, weakly interacting, and naturally …
View article: An effective formalism for testing extensions to General Relativity with gravitational waves
An effective formalism for testing extensions to General Relativity with gravitational waves Open
The recent direct observation of gravitational waves (GW) from merging black holes opens up the possibility of exploring the theory of gravity in the strong regime at an unprecedented level. It is therefore interesting to explore which ext…
View article: Axion string signatures: a cosmological plasma collider
Axion string signatures: a cosmological plasma collider Open
A bstract We study early and late time signatures of both QCD axion strings and hyperlight axion strings (axiverse strings). We focus on charge deposition onto axion strings from electromagnetic fields and subsequent novel neutralizing mec…
View article: First Constraints on Nuclear Coupling of Axionlike Particles from the Binary Neutron Star Gravitational Wave Event GW170817
First Constraints on Nuclear Coupling of Axionlike Particles from the Binary Neutron Star Gravitational Wave Event GW170817 Open
Light axion fields, if they exist, can be sourced by neutron stars due to their coupling to nuclear matter, and play a role in binary neutron star mergers. We report on a search for such axions by analyzing the gravitational waves from the…