A5030111643- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Cosmology and Gravitation Theories
- Neutrino Physics Research
- Atomic and Subatomic Physics Research
- Astrophysics and Cosmic Phenomena
- Particle Detector Development and Performance
- Gamma-ray bursts and supernovae
- Pulsars and Gravitational Waves Research
- Cold Atom Physics and Bose-Einstein Condensates
- Astronomy and Astrophysical Research
- Advanced Frequency and Time Standards
- Stellar, planetary, and galactic studies
- Computational Physics and Python Applications
- Radiation Detection and Scintillator Technologies
- Superconducting and THz Device Technology
- Radio Astronomy Observations and Technology
- Astro and Planetary Science
- Magnetic Field Sensors Techniques
- Black Holes and Theoretical Physics
- High-Energy Particle Collisions Research
- Galaxies: Formation, Evolution, Phenomena
- Noncommutative and Quantum Gravity Theories
- Quantum many-body systems
- Geophysics and Sensor Technology
University of Chicago
2018-2024
Fermi National Accelerator Laboratory
2018-2024
University of California, Irvine
2021-2024
Los Alamos National Laboratory
2024
UC Irvine Health
2023-2024
Durham University
2019
Cornell University
2016-2018
Perimeter Institute
2018
University of California, Berkeley
2013
National Tsing Hua University
2012-2013
Horizon-scale images of black holes (BHs) and their shadows have opened an unprecedented window onto tests gravity fundamental physics in the strong-field regime. We consider a wide range well-motivated deviations from classical General Relativity (GR) BH solutions, constrain them using Event Horizon Telescope (EHT) observations Sagittarius A$^*$ (Sgr A$^*$), connecting size bright ring emission to that underlying shadow exploiting high-precision measurements Sgr A$^*$'s mass-to-distance...
We present a novel dark matter candidate, an elastically decoupling relic, which is cold thermal relic whose abundance determined by the cross section of its elastic scattering on standard model particles. The candidate predicted to have mass ranging from few hundred MeV, and with electrons, photons and/or neutrinos in ${10}^{\ensuremath{-}3}--1\text{ }\text{ }\mathrm{fb}$ range.
We consider generic neutrino dipole portals between left-handed neutrinos, photons, and right-handed heavy neutral leptons (HNL) with Dirac masses. The dominance of this portal significantly alters the conventional phenomenology HNLs. derive a comprehensive set constraints on to HNLs by utilizing data from LEP, LHC, MiniBooNE, LSND as well observations Supernova 1987A consistency standard Big Bang Nucleosynthesis. calculate projected sensitivities proposed high-intensity SHiP beam dump...
We set constraints and future sensitivity projections on millicharged particles (MCPs) based electron scattering data in numerous neutrino experiments, starting with MiniBooNE the Liquid Scintillator Neutrino Detector (LSND). Both experiments are found to provide new (and leading) certain MCP mass windows: 5-35 MeV for LSND 100-180 MiniBooNE. Furthermore, we ongoing Fermilab SBN program, Deep Underground Experiment (DUNE), proposed Search Hidden Particles (SHIP) experiment. In SBND...
We study hidden-sector particles at past (CERN-Hamburg-Amsterdam-Rome-Moscow Collaboration and NuCal), present (NA62, SeaQuest, DarkQuest), future (LongQuest) experiments the high-energy intensity frontier. focus on exploring minimal vector portal next-to-minimal models in which productions decays are decoupled. These have mostly been devised to explain experimental anomalies while avoiding existing constraints. demonstrate that proton fixed-target provide one of most powerful probes for MeV...
With the advent of a new generation neutrino experiments which leverage high-intensity beams for precision measurements, it is timely to explore physics topics beyond standard neutrino-related physics. Given that realm model (BSM) has been mostly sought at high-energy regimes colliders, such as LHC CERN, exploration BSM in will enable complementary measurements energy balance LHC. This concert with ideas fixed target and beam-dump world-wide, e.g., those CERN. The combination high intensity...
We present new models utilizing QCD-like dark sectors to resolve small-scale structure problems. These of resonant self-interacting matter in a sector with QCD are based on analogies the meson spectra standard model QCD. introduce simple that realizes self-interaction (analogous ϕ-K-K system) and thermal freeze-out, which mesons made two light quarks. also consider asymmetric composed heavy quarks realize ϒ(4S)-B-B discuss experimental probes both setups. Finally, we comment possible...
We identify new astrophysical signatures of dark matter that implodes neutron stars (NSs), which could decisively test whether NS-imploding is responsible for missing pulsars in the Milky Way galactic center, source some $r$-process elements, and origin fast-radio bursts. First, forms $\ensuremath{\sim}{10}^{\ensuremath{-}10}$ solar mass or smaller black holes inside stars, proceed to convert into $\ensuremath{\sim}1.5$ (BHs). This decreases number star mergers seen by LIGO/Virgo (LV)...
Heavy neutrinos with additional interactions have recently been proposed as an explanation to the MiniBooNE excess. These scenarios often rely on marginally boosted particles explain excess angular spectrum, thus predicting large rates at higher-energy neutrino-electron scattering experiments. We place new constraints this class of models based sideband measurements performed MINERνA and CHARM-II. A simultaneous energy distributions in terms heavy light mediators is severely constrained by...
We study cosmic-ray-atmosphere collisions as a permanent production source of exotic millicharged particles (MCPs) for all terrestrial experiments. [MCPs are also known charged massive (CHAMPs).] Based on data from Super-K, this allows us to derive new limits MCPs that competitive with, or improve, the currently leading bounds accelerator-based searches masses up 1.5 GeV. In models where subdominant component dark matter (DM) is fractionally charged, these constraints probe parts parameter...
We explore the phenomenology of Elastically Decoupling Relic (ELDER) dark matter. ELDER is a thermal relic whose present density determined primarily by cross-section its elastic scattering off Standard Model (SM) particles. Assuming that this mediated kinetically mixed photon, we argue scenario makes robust predictions for electron-recoil direct-detection experiments, as well photon searches. These are independent details interactions within sector. Together with closely related...
We propose a low-cost and movable setup to probe minicharged particles using high-intensity proton fixed-target facilities. This proposal, FerMINI, consists of scintillator-based detector, requiring multicoincident scintillation signatures within small time window, located downstream the target neutrino experiment. During collisions large number protons on target, intense particle beams may be produced via meson photo-decays Drell-Yan production. take advantage high statistics, shielding,...
Our current understanding of the Universe is established through pristine measurements structure in cosmic microwave background (CMB) and distribution shapes galaxies tracing large scale (LSS) Universe. One key ingredient that underlies cosmological observables field sources observed assumed to be initially Gaussian with high precision. Nevertheless, a minimal deviation from Gaussianityis perhaps most robust theoretical prediction models explain Universe; itis necessarily present even...
We identify what may be the world's most sensitive location to search for millicharged particles in 10 MeV 100 GeV mass range: forward region at LHC. propose constructing a scintillator-based experiment, FORward MicrOcharge SeArch (FORMOSA) this location. FORMOSA can discover large and unexplored of parameter space, including strongly interacting dark matter (mSIDM) candidates that cannot probed by ground-based direct-detection experiments. The newly proposed LHC Forward Physics Facility...
Abstract We study for the first time possibility of probing long-range fifth forces utilizing asteroid astrometric data, via force-induced orbital precession. examine nine Near-Earth Object (NEO) asteroids whose trajectories are accurately determined optical and radar astrometry. Focusing on a Yukawa-type potential mediated by new gauge field (dark photon) or baryon-coupled scalar, we estimate sensitivity reach force coupling strength mediator mass in range m ≃ (10 -21 -10 -15 ) eV, near...
Abstract We derive purely gravitational constraints on dark matter and cosmic neutrino profiles in the solar system using asteroid (101955) Bennu. focus Bennu because of its extensive tracking data high-fidelity trajectory modeling resulting from OSIRIS-REx mission. find that local density is bound by ρ DM ≲ 3.3 × 10 -15 kg/m 3 ≃ 6 ρ̅ , vicinity ∼ 1.1 au (where 0.3 GeV/cm ). show high-precision objects can constrain overdensities relative to Standard Model prediction n̅ ν at level η ≡ n /n̅...
<title>Abstract</title> Using the OSIRIS-REx mission and ground-based tracking data for asteroid Bennu, we derive new constraints on fifth forces ultralight dark matter. The bounds obtain are strongest mediator masses $m \sim 10^{-18} - 10^{-17}\,{\rm eV}$, where currently achieve tightest bounds. Our limits can be translated to a wide class of models leading Yukawa-type forces, demonstrate how they apply $U(1)_B$ photons baryon-coupled scalars. results potential in probing well-motivated...
We study the critical phenomena of Kerr-AdS black hole. Phase structures are observed at different temperatures, ${T}_{L}$, ${T}_{c1}$ and ${T}_{c2}$ with various features. discuss thermal stability considering isothermal compressibility how phase transitions related to each other. The asymptotic value angular momentum also has an implication on separating stable unstable part. Near temperature ${T}_{c1}$, order parameter is determined calculate exponents. All exponents...
CMB-HD is a proposed millimeter-wave survey over half the sky that would be ultra-deep (0.5 uK-arcmin) and have unprecedented resolution (15 arcseconds at 150 GHz). Such answer many outstanding questions about fundamental physics of Universe. Major advances 1.) use gravitational lensing primordial microwave background to map distribution matter on small scales (k~10 h Mpc^(-1)), which probes dark particle properties. It will also allow 2.) measurements thermal kinetic Sunyaev-Zel'dovich...
Abstract A thorough understanding of neutrino–nucleus scattering physics is crucial for the successful execution entire US neutrino program. Neutrino–nucleus interaction constitutes one biggest systematic uncertainties in experiments—both at intermediate energies affecting long-baseline deep underground experiment, as well low coherent program—and could be difference between achieving or missing discovery level precision. To this end, electron–nucleus experiments provide vital information to...
A bstract Oscura is a planned light-dark matter search experiment using Skipper-CCDs with total active mass of 10 kg. As part the detector development, collaboration plans to build Integration Test (OIT), an engineering test 10% mass. Here we discuss early science opportunities OIT for millicharged particles (mCPs) NuMI beam at Fermilab. mCPs would be produced low energies through photon-mediated processes from decays scalar, pseudoscalar, and vector mesons, or direct Drell-Yan productions....
Bringing an external radioactive source close to a large underground detector can significantly advance sensitivity not only sterile neutrinos but also "dark" gauge bosons and scalars. Here we address in detail the reach of Borexino-SOX configuration, which will see powerful (a few PBq) 144Ce–144Pr installed next Borexino detector, light scalar particles coupled SM fermions. The mass this configuration is limited by energy release γ-cascade, particular case 2.2 MeV. Within that one year...
A bstract In hidden sector models, dark matter does not directly couple to the particle content of Standard Model, strongly suppressing rates at direct detection experiments, while still allowing for large signals from annihilation. this paper, we conduct an extensive study matter, covering a wide range spins, mediator interaction diagrams, and annihilation final states, in each case determining whether annihilations are s -wave (thus enabling efficient universe today). We then go on...
In this paper, we find that a magnetic transition dipole moment between tau and sterile neutrinos can account for the XENON1T excess events. Unlike ordinary neutrino moment, introduction of new mass scale allows astrophysical bounds to be suppressed. Interestingly, best-fit regions are compatible with SN1987A imply either boron-8 as source flux. We in $\ensuremath{\sim}(500--800)\text{ }\mathrm{keV}$ range capable evading constraints while being able successfully explain event rate. also set...