If existing, feebly interacting particles such as sterile neutrinos, axion-like particles, and others could have been abundantly produced in the core formed during the collapse of Sanduleak in 1987. The duration of the neutrino burst detected at Kamiokande II and at the Irvine–Michigan–Brookhaven (IMB) experiment depended on the cooling speed of the newly formed proto-neutron star at the...
We will introduce new cosmological dynamics of the QCD axion, where the axion field rotates in field space. Axion dark matter may be produced from the kinetic energy of the rotation and the required axion decay constant is much below the prediction of the conventional evolutions. The angular momentum of the rotation is transferred into baryon asymmetry through baryon number violating...
In most direct detection experiments, the free nuclear recoil description of dark matter scattering breaks down for masses ≲ 100 MeV, or when the recoil energy is comparable to a few times the typical phonon energy. For dark matter lighter than 1 MeV, scattering via excitation of a single phonon dominates and has been computed previously, but for the intermediate mass range or higher detector...
Light thermal dark matter, whose mass is below 1GeV, is an attractive candidate for dark matter, as its abundance in the present universe is well explained by the thermal freeze-out mechanism. At the same time, it may solve the so-called core-cusp problem via its strong enough self-scattering. We study a minimal model for a light scalar dark matter as an example of such a candidate, requiring...
We derive purely gravitational constraints on dark matter and cosmic neutrino profiles in the solar system using asteroid (101955) Bennu.
We focus on Bennu because of its extensive tracking data and high-fidelity trajectory modeling resulting from the OSIRIS-REx mission. We find that the local density of dark matter is bound by $\rho_{\rm DM} < 3.3\times 10^{-15}\;\rm kg/m^3 \simeq...
We propose a novel technique to search for axions with an optomechanical cavity filled with a material such as superfluid helium. Axion absorption converts a pump laser photon to a photon plus a phonon. The axion absorption rate is enhanced by the high occupation number of coherent photons or phonons in the cavity, allowing our proposal to largely overcome the extremely small axion coupling....
Solving the SM finetuning problems requires introduction of both SUSY and PQ symmetry, all in a stringy context for unification with gravity. Discrete R-symmetries which emerge from string compactifications can generate an approximate, accidental PQ symmetry in the SUSY DFSZ type model with axion decay constant related to the SUSY breaking scale in the cosmological sweet spot, with R-parity...
We analyze the preferred SUSY parameter space that is in agreement with the Dark Matter (DM) relic density, the direct detection (DD) bounds, the LHC searches as well as $(g-2)_\mu$. Seven different scenarios are identified. For each scenario we analyze the complementarity between future DD experiments and direct searches at the (HL-)LHC and future $e^+e^-$ colliders. It is demonstrated that...
We present a Spin 3/2 FIMP dark matter (DM) candidate. FIMP dark matter is produced via the freeze-in mechanism that generally implies tiny coupling between the DM and the standard model particles, making DM direct detection almost hopeless. This is not the case for a spin 3/2 DM at low reheating temperature, where collider bounds play a fundamental role in constraining the parameter space. We...
Authors: Mukesh Kumar Pandey, Chih-Pan Wu, Lakhwinder Singh, C.-P. Liu, Hsin-Chang Chi, Jiunn-Wei Chen, Henry T. Wong
Direct searches of dark matter (DM) through its scattering with electrons have been a rapidly growing field in the past decade. With the low-threshold capabilities of modern detectors in electron recoil (ER) and new ideas inspired by theoretical studies, the coverage of DM...
While most searches for cosmic axions so far focused on their cold relics as (a component of) dark matter, various well-motivated cosmological sources can produce ``boosted'' axions that remain relativistic today. In this talk I will demonstrate that existing/upcoming neutrino experiments such as Super-Kamiokande, Hyper-Kamiokande, DUNE, JUNO, and IceCube can probe such energetic axion relics....
