195 citations · 693 across the 21 of their papers we have counts for
22 papers
Cooling the Shock: New Supernova Constraints on Dark Photons
Andrea Caputo, Hans-Thomas Janka, Georg Raffelt +1
During the accretion phase of a core-collapse supernova (SN), dark-photon (DP) cooling can be largest in the gain layer below the stalled shock wave. In this way, it could counter-…
Inching toward the QCD Axions with Axion Magnetic Resonance in Helioscopes
Hyeonseok Seong, Chen Sun, Seokhoon Yun
Utilizing a helical magnet profile to enhance axion-photon conversion showed great promise in laboratory searches for high axion masses. We extend the mechanism, known as the axion…
Axion Magnetic Resonance: A Novel Enhancement in Axion-Photon Conversion
Hyeonseok Seong, Chen Sun, Seokhoon Yun
We identify a new resonance, axion magnetic resonance (AMR), that can greatly enhance the conversion rate between axions and photons. A series of axion search experiments rely on c…
Terrestrial detection of hidden vectors produced by solar nuclear reactions
Francesco D'Eramo, Giuseppe Lucente, Newton Nath +1
Solar nuclear reactions can occasionally produce sub-MeV elusive beyond the Standard Model particles that escape the solar interior without further interactions. This study focuses…
Dark gauge boson emission from supernova pions
Chang Sub Shin, Seokhoon Yun
The hot, neutron-rich, and dense circumstance in core-collapse supernovae provides a source of negatively charged pions that may make up a significant portion of the matter. These…
Axion Free-kick Misalignment Mechanism
Ling-Xiao Xu, Seokhoon Yun
We propose an alternative scenario for the axion misalignment mechanism based on the nontrivial interplay between the axion and a light dilaton in the early universe. Dark matter a…
Particle dispersion in the classical vector dark matter background
Eung Jin Chun, Seokhoon Yun
Interactions with a background medium modify in general the dispersion relation and canonical normalization of propagating particles. This can have an important phenomenological co…
Flavor Violating Axions in the Early Universe
Francesco D'Eramo, Seokhoon Yun
Flavor violating axion couplings can be in action before recombination, and they can fill the early universe with an additional radiation component. Working within a model-independ…
Dark gauge boson production from neutron stars via nucleon-nucleon bremsstrahlung
Chang Sub Shin, Seokhoon Yun
We discuss the dark gauge boson emission from neutron stars via nucleon-nucleon bremsstrahlung. Through the rigorous treatment of the effective field theory prescription and the th…
Thermal QCD Axions across Thresholds
Francesco D'Eramo, Fazlollah Hajkarim, Seokhoon Yun
Thermal axion production in the early universe goes through several mass thresholds, and the resulting rate may change dramatically across them. Focusing on the KSVZ and DFSZ frame…
Thermal axion production at low temperatures: a smooth treatment of the QCD phase transition
Francesco D'Eramo, Fazlollah Hajkarim, Seokhoon Yun
We study thermal axion production around the confinement scale. At higher temperatures, we extend current calculations to account for the masses of heavy quarks, whereas we quantif…
Vector dark matter from a gauged symmetry
Takaaki Nomura, Hiroshi Okada, Seokhoon Yun
We propose a scenario of dark sector described by a hidden gauge symmetry which is broken by a vacuum expectation value(VEV) of a scalar multiplet. We discuss a general mas…
Cooling of young neutron stars and dark gauge bosons
Deog Ki Hong, Chang Sub Shin, Seokhoon Yun
The standard cooling scenario in the presence of nucleon superfluidity fits rather well to the observation of the neutron stars. It implies that the stellar cooling arguments could…
Axion and neutrino mass from a hidden gauge symmetry model
Takaaki Nomura, Hiroshi Okada, Seokhoon Yun
We propose a model of dark sector described by gauged hidden symmetry in which neutrino masses are generated at one-loop level and axion is induced by assigning Peccei-Qui…
Axion-photon-dark photon oscillation and its implication for 21 cm observation
Kiwoon Choi, Hyeonseok Seong, Seokhoon Yun
We examine the resonant conversion of axion-like particle (ALP) or dark photon to the electromagnetic photon in the early Universe, which takes place due to the ALP-photon-dark pho…
Axion scales and couplings with Stückelberg mixing
Kiwoon Choi, Chang Sub Shin, Seokhoon Yun
We study the axion field range and low energy couplings in models with Stückelberg mixing between axions and gauge bosons. It is noted that the gauge-invariant axion combina…
Gamma-ray spectral modulations induced by photon-ALP-dark photon oscillations
Kiwoon Choi, Sangjun Lee, Hyeonseok Seong +1
Recently it has been noticed that the Fermi-LAT data of gamma-rays from some galactic pulsars and supernova remnants reveal spectral modulations that might be explained by the conv…
Minimal Flavor Violation with Axion-like Particles
Kiwoon Choi, Sang Hui Im, Chan Beom Park +1
We revisit the flavor-changing processes involving an axion-like particle (ALP) in the context of generic ALP effective lagrangian with a discussion of possible UV completions prov…
Dark photon relic dark matter production through the dark axion portal
Kunio Kaneta, Hye-Sung Lee, Seokhoon Yun
We present a new mechanism to produce the dark photon () in the early universe with a help of the axion () using a recently proposed dark axion portal. The dark photon, a li…
Portal Connecting Dark Photons and Axions
Kunio Kaneta, Hye-Sung Lee, Seokhoon Yun
The dark photon and the axion (or axion-like particle) are popular light particles of the hidden sector. Each of them has been actively searched for through the couplings called th…
Mini Force: the (B-L) + xY gauge interaction with a light mediator
Hye-Sung Lee, Seokhoon Yun
The relevant phenomenology and the best search schemes of a subelectroweak-scale gauge boson can be vastly different depending on its coupling. For instance, the rare decay into a…
Natural inflation with multiple sub-Planckian axions
Kiwoon Choi, Hyungjin Kim, Seokhoon Yun
We extend the Kim-Nilles-Peloso (KNP) alignment mechanism for natural inflation to models with axions, which obtains a super-Planckian effective axion decay constant $f_{\tex…