388 citations · 1.7k across the 35 of their papers we have counts for
36 papers
Kinetic Equilibrium between SIMP Dark Matter and Radiation via Internal Bremsstrahlung
Xiaoyong Chu, Ajay Kaladharan, Yassine El Mohtadi
As an alternative to standard dark matter freeze-out via two-body annihilation, strongly interacting massive particles are proposed to regulate their relic abundance through three/…
Probing Cosmic-Ray-Boosted and Supernova-Sourced Sub-GeV Dark Matter with Paleo-Detectors
Xiaoyong Chu, Yue-Lin Sming Tsai, Mei-Wen Yang
Astrophysical dark matter particles with masses well below GeV-scale can be difficult to detect using conventional nuclear recoil experiments due to their low velocities in our Mil…
From SIMP miracles to WIMP dead ends: navigating the freeze out of MeV-mass dark matter
Xiaoyong Chu, Josef Pradler
We summarize here our studies \cite{Chu:2022xuh,Chu:2023jyb,Chu:2024rrv} on two distinct scenarios for MeV-mass thermal dark matter freeze-out. First, we determine the minimal viab…
Dark matter bound-state formation in the Sun
Xiaoyong Chu, Raghuveer Garani, Camilo García-Cely +1
The Sun may capture asymmetric dark matter (DM), which can subsequently form bound-states through the radiative emission of a sub-GeV scalar. This process enables generation of sca…
Even SIMP miracles are possible
Xiaoyong Chu, Marco Nikolic, Josef Pradler
Strongly interacting massive particles have been advocated as prominent dark matter candidates when they regulate their relic abundance through odd-numbered annihila…
On the minimal mass of thermal dark matter and the viability of millicharged particles affecting 21cm cosmology
Xiaoyong Chu, Josef Pradler
Thermal freeze-out offers an attractive explanation of the dark matter density free from fine-tuning of initial conditions. For dark matter with a mass below tens of MeV, photons,…
Multipole vector dark matter below the GeV-scale
Xiaoyong Chu, Junji Hisano, Alejandro Ibarra +2
We consider electrically neutral complex vector particles below the GeV mass scale that, from a low energy perspective, couple to the photon via higher dimensional form factor…
Effects of the interplay between fermionic interactions and disorders in the nodal-line superconductors
Wen-Hao Bian, Xiao-Zhuo Chu, Jing Wang
We study the interplay between fermion-fermion interactions and disorder scatterings beneath the superconducting dome of noncentrosymmetric nodal-line superconductors. With the app…
Towards a full description of MeV dark matter decoupling: a self-consistent determination of relic abundance and
Xiaoyong Chu, Jui-Lin Kuo, Josef Pradler
Thermal dark matter at the MeV mass-scale has its abundance set during the highly non-trivial epochs of neutrino decoupling and electron annihilation. The technical obstacles attac…
Dark Freeze-out Cogenesis
Xiaoyong Chu, Yanou Cui, Josef Pradler +1
We propose a new mechanism where a multi-component dark sector generates the observed dark matter abundance and baryon asymmetry and thus addresses the coincidence between the two.…
Scalar Dark Matter Candidates -- Revisited
Céline Bœhm, Xiaoyong Chu, Jui-Lin Kuo +1
We revisit the possibility of light scalar dark matter, in the MeV to GeV mass bracket and coupled to electrons through fermion or vector mediators, in light of significant experim…
Dark sector-photon interactions in proton-beam experiments
Xiaoyong Chu, Jui-Lin Kuo, Josef Pradler
We consider electromagnetically neutral dark states that couple to the photon through higher dimensional effective operators, such as electric and magnetic dipole moment, anapole m…
Self-interacting dark matter without prejudice
Nicolás Bernal, Xiaoyong Chu, Suchita Kulkarni +1
The existence of dark matter particles that carry phenomenologically relevant self-interaction cross sections mediated by light dark sector states is considered to be severely cons…
A Practical and Consistent Parametrization of Dark Matter Self-Interactions
Xiaoyong Chu, Camilo Garcia-Cely, Hitoshi Murayama
Self-interacting dark matter has been proposed to explain the apparent mass deficit in astrophysical small-scale halos, while observations from galaxy clusters suggest that the cor…
Stellar probes of dark sector-photon interactions
Xiaoyong Chu, Jui-Lin Kuo, Josef Pradler +1
Electromagnetically neutral dark sector particles may directly couple to the photon through higher dimensional effective operators. Considering electric and magnetic dipole moment,…
Finite-size dark matter and its effect on small-scale structure
Xiaoyong Chu, Camilo Garcia-Cely, Hitoshi Murayama
If dark matter has a finite size that is larger than its Compton wavelength, the corresponding self-interaction cross section decreases with the velocity. We investigate the implic…
Light dark states with electromagnetic form factors
Xiaoyong Chu, Josef Pradler, Lukas Semmelrock
New particles that are electrically neutral but couple to the electromagnetic current via higher-dimensional operators and that are sufficiently light, at or below the GeV-mass…
Velocity Dependence from Resonant Self-Interacting Dark Matter
Xiaoyong Chu, Camilo Garcia-Cely, Hitoshi Murayama
The dark matter density distribution in small-scale astrophysical objects may indicate that dark matter is self-interacting, while observations from clusters of galaxies suggest th…
Sterile Neutrinos with Secret Interactions -- Cosmological Discord?
Xiaoyong Chu, Basudeb Dasgupta, Mona Dentler +2
Several long-standing anomalies from short-baseline neutrino oscillation experiments -- most recently corroborated by new data from MiniBooNE -- have led to the hypothesis that ext…
Core formation from self-heating dark matter
Xiaoyong Chu, Camilo Garcia-Cely
Cosmological simulations of the CDM model suggest that the dark matter halos of dwarf galaxies are denser in their center than what observational data of such galaxies imply. In…
Self-interacting Spin-2 Dark Matter
Xiaoyong Chu, Camilo Garcia-Cely
Recent developments in bigravity allow one to construct consistent theories of interacting spin-2 particles that are free of ghosts. In this framework, we propose an elementary spi…
Dark matter indirect signals with long-lived mediators
Xiaoyong Chu, Suchita Kulkarni, Pierre Salati
Dark matter particles could annihilate into light and metastable mediators subsequently decaying far away from where they are produced. In this scenario, the indirect signatures of…
Self-interacting dark matter as a solution to the problems in small-scale structures
Camilo Garcia-Cely, Xiaoyong Chu
Dark matter self-interactions are a well-motivated solution to the core-vs.-cusp and the too-big-to-fail problems. They are commonly induced by means of a light mediator, that is a…
Simply split SIMPs
Nicolás Bernal, Xiaoyong Chu, Josef Pradler
Dark Matter which interacts strongly with itself, but only feebly with the Standard Model is a possibility that has been entertained to solve apparent small-scale structure problem…