Disciplines / Research questions
Physics
691 research topics · 2739 questions
Ultracold atomic chip4 questions
Coherent Y-junction splitting and fragmentation suppression for a guided atom interferometer on a superconducting atom chip
Open for about 18 yearsContinuous quantum degeneracy in a continuously pumped, light-shielded magnetic reservoir of ultracold atoms
Open for about 11 yearsCoherent two-photon microwave transfer and microwave-induced Fano-Feshbach resonances for ultracold sodium on a strong-microwave atom chip
Open for about 16 yearsOrigin of the excess phase noise on Ramsey recurrences in a Bose–Einstein condensate interferometer with state-dependent microwave potentials on an atom chip
Open for about 17 years
High-sensitivity detection technology for ultrasound molecular imaging3 questions
In vivo pharmacokinetics, safety, and generalizability of tetrazine-TCO pretargeted microbubble capture for acute-thrombus ultrasound molecular imaging
Open for about 9 yearsTranslating VEGFR2-targeted ultrasound molecular imaging from a transgenic mouse model to early breast cancer detection in women
Open for about 13 yearsPhysical Mechanisms of Acoustic Radiation Force–Enhanced Signal Decorrelation of Adherent Targeted Microbubbles and Quantitative Validation of Decorrelation-Weighted Pulse Inversion Contrast Imaging
Open for about 9 years
Mechanism of Ultrasound Energy and Sonochemistry2 questions
Effect of ultrasonic vibration on friction characteristics at contact interfaces5 questions
Quantitative theory of ultrasonic friction-torque reduction in the slow-motion regime: a slowly rotating adhesive micro-contact on an ultrasonically vibrated surface
Open for about 12 yearsQuantitative characterization of surface-acoustic-wave-induced friction suppression in microscopic contacts
Open for about 26 yearsExtending the analytical elastoplastic contact model of longitudinal-vibration friction reduction to real engineering surfaces (asperity interactions, measured height distributions, high-load accuracy, and experimental validation)
Open for about 6 yearsRough-surface contact mechanics and predictive torque capability for a toothless MEMS traveling-wave ultrasonic micromotor
Open for about 6 yearsUltrasonic weakening of static friction at amorphous interfaces: microslip versus adhesion mechanisms, effective-temperature constitutive account, and transfer to granular media
Open for about 13 years
Acoustic cavitation mechanism of ultrasound preparation of nanomaterials4 questions
Mechanism, ambient stability, and functional integration of sonochemically synthesized hydrogenated amorphous silicon nanoparticles from liquid trisilane
Open for about 9 yearsQuantitative mechanism of ultrasonic cavitation-induced deagglomeration: partitioning shock-wave, bubble-cluster-oscillation, streaming, and ultrasonic-capillary contributions
Open for about 4 yearsAcoustic-cavitation-resolving model of ultrasound-intensified reactive mixing in the swirling vortex flow reactor
Open for about 3 yearsQuantitative mechanism, phase-purity window, generality, and scale-up of the ultrasonic-assisted ambient synthesis of surfactant-free colloidal Mn3O4 nanoparticles
Open for about 20 years
Basic Formulation and Finiteness of Superstring Theory10 questions
Cubic NSNS self-interactions, field redefinitions, and fermionic sectors of the two-field type II superstring field theory
Open for about 1 yearThe on-shell value of the closed string field theory action and its boundary/tadpole completion in noncompact backgrounds
Open for about 22 yearsCompleting the linear-dilaton regularization of light-cone gauge superstring amplitudes: extension to heterotic and type I strings, and infrared divergences of the critical limit
Open for about 7 yearsBackground independence of closed string field theory beyond marginally connected backgrounds
Open for about 33 yearsField-redefinition uniqueness and background independence of open-closed superstring field theory
Open for about 7 yearsRigorous, assumption-free equivalence of the two contour prescriptions in superstring perturbation theory (low spacetime dimensions, stub-free intermediate-state sums, and controlled integral interchanges)
Open for about 9 yearsCompleting the linear-dilaton regularization of light-cone gauge superstring field theory: heterotic and Type I amplitudes, and a nonperturbative definition
Open for about 10 yearsInfrared-finite inclusive observables and perturbative unitarity of superstring field theory in four or fewer non-compact dimensions
Open for about 10 yearsSupermoduli-space foundations of closed superstring field theory: the single-cover and canonical picture-changing-insertion problem
Open for about 12 yearsGlobal background independence of superstring field theory: a formulation valid beyond closely related backgrounds
Open for about 33 years
The landscape picture of superstring theory10 questions
Controlled realization of maximal-vacuum-energy selection of the weak scale in a UV-complete landscape
Open for about 7 yearsSwampland volume-growth and field-range bounds beyond supersymmetry: deciding the field-excursion-bound vacuum-counting argument
Open for less than 1 yearKähler-modulus completion of the universal class of type-IIB flux vacua with analytic mass spectrum: full stabilization within the Large Volume Scenario and stability of the complex-structure sector
Open for about 5 yearsStructure of the exact flux-vacuum landscape: genericity of level reduction, the Hodge tensor-symmetry correspondence, and point-like vacua
Open for about 2 yearsUplift-mechanism dependence of the joint statistics of SUSY breaking and the cosmological constant in the string flux landscape
Open for about 3 yearsDoes the elliptic Calabi–Yau fourfold dominate the F-theory flux-vacuum landscape?
Open for about 10 yearsCompatibility of the integrated Gibbons-Maldacena-Nunez constraint with the four-dimensional trace constraint in brane-uplifted de Sitter vacua of type IIB string theory
Open for about 10 yearsExploiting and diagnosing sampler-induced structure in the flux landscape at large number of moduli: permutation-aware sampling, the intermediate regime, and the separation of algorithmic bias from landscape structure
Open for about 3 yearsGrowth, complexity, and dimensionality of the type IIB/F-theory flux-vacuum locus: the Grimm–Monnee counting conjectures
Open for about 2 yearsThe geometric factor in flux-vacuum counting: does moduli-space Euler-density suppression generically overcome flux-ball growth across the Calabi-Yau landscape?
Open for about 7 years
The Burst Mechanism of Supernova3 questions
Robustness of the progenitor-structure-to-explosion-outcome mapping in calibrated parametrized spherically symmetric core-collapse supernova models (PUSH): calibration transferability, multi-dimensional validation, fallback, rotation, and progenitor uncertainties
Open for about 8 yearsPulsational delayed detonation of a bound white dwarf after a failed surface detonation: viability and observational outcome of the channel for Type Ia supernovae
Open for about 32 yearsQuantitative multi-dimensional explosion threshold and predictive explosion criterion for neutrino-driven core-collapse supernovae
Open for about 12 years
Are the supernova remnants the origin of cosmic rays?1 questions
First-principles calculation methods beyond LDA5 questions
Making density-corrected DFT trustworthy: predicting when HF-DFT improves results for the right reason, and co-designing functionals with better densities
Open for about 3 yearsFeasible fully screened exchange and the universal reliability of beyond-RPA corrections to the random-phase-approximation correlation functional
Open for about 19 yearsOpen development frontiers of the Variational Discrete Action Theory: scalable discrete-action evaluation, unitary sequential product density matrices, a practical DFT+VDAT workflow, and off-shell energy-functional parameterization
Open for about 5 yearsLong-Range Charge-Fluctuation (RPA) Correlation and Size-Extensive Multireference Increments in the Wave-Function Treatment of Bulk Metals
Open for about 12 yearsSurpassing the range-separated hybrid meta-GGA performance ceiling: genuinely nonlocal exchange-correlation functionals for molecular chemistry
Open for less than 1 year
Magnetization/Particle Number Sector4 questions
Constructive eigenfunction mapping for the one-dimensional charge-pair Hubbard model and the origin of odd-lattice-size level crossings in the Hubbard chain
Open for about 6 yearsConvergence of the Bethe-root series solution of the Heisenberg and XXZ spin chains in a magnetic field
Open for about 7 yearsOrdering of magnetization-sector lowest energies and continuity of the lowest-energy branch at commensurate magnetization in one-dimensional U(1)-symmetric spin chains
Open for about 11 yearsMagnetic structure of antiferromagnetic spin-1 Bose-Hubbard ground states beyond the minimal-total-spin theorem, with continuum contact-interaction and higher-spin extensions
Effective Mechanism for Magnetic Energy Release—Magnetic Reconnection4 questions
Conversion efficiency from flux expelled by a color-spin-locked quark-star phase transition to coherent radio emission
Open for about 1 yearFast magnetic reconnection in the magnetorotational-supernova proto-neutron-star core: which mechanism operates, and is it fast enough to matter?
Open for about 20 yearsDoes magnetic reconnection limit MRI-driven field amplification in magnetorotational core-collapse supernovae? The unverified reconnection timescale in the proto-neutron-star regime
Open for about 20 yearsMagnetospheric coupling and radiative efficiency of magnetic-flux expulsion from a color-spin-locked quark core: the uncomputed emission mechanism of the CSL fast-radio-burst scenario
Open for about 1 year
Zero-bias anomalies in tunnelling magnetoresistance in magnetic heterojunctions5 questions
Self-consistent nonequilibrium many-body theory of electron-magnon interaction in realistic three-dimensional magnetic tunnel junctions: reproducing the zero-bias anomaly, finite-bias TMR, and inelastic spin-transfer torque
Open for about 12 yearsMicroscopic foundation and experimental validation of the effective-circuit theory for the cusplike zero-bias anomaly in tunneling magnetoresistance
Open for about 16 yearsOrigin of the negative zero-bias anomaly and high-energy inelastic features in MgO tunnel junctions with magnetic and nonmagnetic electrodes
Open for about 16 yearsInterfacial magnon excitation and temperature-stable tunnel magnetoresistance in Co2MnSi/MgO magnetic tunnel junctions
Open for about 18 yearsMicroscopic origin of the zero-bias anomaly and defect-mediated tunneling statistics in Al2O3-barrier magnetic tunnel junctions
Open for about 19 years
Subleading eigenvalues and correlation lengths3 questions
Correlation length of the quantum transverse-field Ising model on the Bethe lattice: the bound and the conjectured sharp critical value
Open for about 18 yearsSymmetry-enforced minimal entanglement and minimal correlation length in integer spin-J chains beyond matrix product states
Open for about 1 yearExact transfer-matrix spectrum and closed-form ground-state entropy of the Ising antiferromagnet on the Shastry–Sutherland lattice at
Open for about 45 years
What can the fine structure of hypernuclear spectra tell us?2 questions
Quantifying the ΛNN–ΣNN three-body-force effects on the high-lying (³He–d)+Λ continuum states of ⁶_ΛLi within a self-consistent structure-plus-reaction framework
Open for about 1 yearDynamical origin of spin-dependent charge-symmetry breaking in the ΛN interaction: the A = 4 mirror hypernuclei ⁴ΛH–⁴ΛHe
Open for about 53 years
Fermion mass hierarchies and flavor mixing from flavor symmetry7 questions
Dynamical origin of the dominant flavor-symmetric (democratic) quark Yukawa matrix and its compatibility with SO(10)/E6 grand unification
Open for about 7 yearsCompleting the disentanglement of fermion mass and flavor-mixing hierarchies: lepton-sector realization and phenomenological closure of the flavor-blind hierarchy framework
Open for about 10 yearsDynamical origin of the flat (democratic) flavor structure and its extension to Majorana neutrinos and non-normal orderings
Open for about 3 yearsCompleting the modular weighton mechanism for fermion mass hierarchies: weighton vacuum, Kähler and SUSY-breaking corrections, and cosmological viability
Open for about 6 yearsA complete modular flavor model simultaneously preserving the up- and down-sector quark-lepton mass relations
Open for about 2 yearsComplete classification of fermion mass hierarchies near the cusp in modular flavor symmetry models
Open for about 1 yearCompleting the TeV-scale flavor-deconstruction framework: classification, ultraviolet origin, and experimental testability of vector-like-fermion chains for the fermion mass hierarchy
Open for less than 1 year
Algebraic Bethe ansatz4 questions
Off-shell Bethe vectors beyond the classical Lie series: intrinsic meaning of the uniformizing parameters and extension to exceptional and quantum affine algebras
Open for less than 1 yearCompleteness of the Bethe ansatz for the open XXZ spin chain with non-diagonal boundary terms
Open for about 23 yearsExact arithmetic of the spin-1/2 XXX Bethe equations: closed-form counting functions, the Pauli principle for Bethe roots, and unphysical singular solutions in the thermodynamic limit
Open for about 13 yearsCompleting the nested algebraic Bethe ansatz for rational spin chains with arbitrary simple -symmetry: the fusion conjecture, unwanted terms, and multi-excitation creation operators
Open for about 2 years
Hard-square model with diagonal interaction2 questions
Manipulation and measurement of individual nanostructures6 questions
Dynamical stability and quantitative Brownian-motion spectroscopy of an optically trapped nanoparticle in superfluid helium
Open for about 5 yearsQuantitative mechanism and predictive design of single-beam three-dimensional optical trapping of plasmonic metal nanowires
Open for about 13 yearsQuantum regime of two Coulomb-coupled nanospheres in a bichromatic optical tweezer: simultaneous ground-state cooling, coherent exchange, and individual addressing
Open for about 2 yearsQuantitative limits of optical-force absorption spectroscopy and quantum-resonant sorting of single nanoparticles
Open for about 5 yearsMicroscopic origin and predictive force laws of electron-beam trapping of nanoparticles in liquid cells
Open for about 13 yearsUnresolved metrology and mechanisms in four-point in situ electron-microscopy electromechanical characterization of freestanding metallic and semiconducting nanowires
Open for about 12 years
Unsolvable boundary of the monomer–dimer problem1 questions
Optical precision control of single atoms9 questions
Quantum-limited, calibration-free superresolution microscopy of optical fields with a single tweezer-trapped atom
Open for about 4 yearsMetasurface-lens optical tweezers for single neutral atoms: closing the efficiency, chromatic, and scaling gaps to objective-class performance
Open for about 4 yearsFault-tolerance analysis of single-atom addressing by standing-wave quenching in optical lattices
Open for about 19 yearsMicroscopic mechanism of the sharply bias-field-dependent single-atom lifetime in a circularly polarized metalens optical tweezer
Open for about 1 yearSingle-atom trapping, deterministic detection, and control in 3D-printed fiber-lens optical tweezers
Open for about 4 yearsRobustness of SLAP-based single-site addressing of ultracold atoms in optical lattices to spin decoherence, site defects, pump-node imperfections, and photon scattering
Open for about 13 yearsMagnetically insensitive Raman sideband cooling of a single atom to the three-dimensional motional ground state of an optical tweezer
Open for about 9 yearsFull three-dimensional motional ground-state cooling of single atoms in state-dependent optical tweezers via chirp cooling
Open for about 3 yearsSub- site-addressed single-qubit gates for neutral atoms in optical lattices: spontaneous-scattering and beam-misalignment limits
Open for about 20 years
How do protein chains fold into natural structures?10 questions
Is the folding energy landscape of the B-domain of staphylococcal protein A genuinely multiple-funnelled? Equilibrium weights, force-field robustness, and experimental detection of competing non-native funnels
Open for about 18 yearsElectrostatic control of folding cooperativity in single-domain proteins: mechanism, generality, prediction, and engineering
Open for about 16 yearsRobustness and physical basis of the global effect of point mutations on the site-specific stability and folding of the αtα helix-turn-helix motif
Open for about 8 yearsMechanistic rules of chaperone-assisted cotranslational folding: how ribosome proximity and trigger factor determine de novo folding pathways at peptide resolution
Open for about 2 yearsGeneral folding-location rules for cotranslational folding of protein domains at the ribosome exit tunnel
Open for about 11 yearsQuantitative, residue-level mechanism of cotranslational protein folding on the ribosome: generality across folds, ribosome–nascent-chain interaction energetics, and chaperone modulation
Open for about 18 yearsUnresolved folding-landscape features of the fast-folding λ-repressor variant λYA near the downhill limit: origin of the minor slow phase, transition-state ensemble composition, possible incipient-downhill subpopulation, and the kinetic prefactor
Open for about 10 yearsMicroscopic origin of folding barriers and many-body cooperativity in small single-domain proteins
Open for about 20 yearsMechanism of the structural-Zn(II)-induced switch from cooperative to partly downhill folding in prokaryotic zinc-finger domains: intermediate structure, metal-binding kinetics, determinants, and generality
Open for about 13 yearsGenerality of the foldon-based stepwise pathway model of protein folding
Open for about 11 years
Equivalence Principle—The Fundamental Principle of Physics6 questions
Improved quantum test of the weak equivalence principle for atoms in coherent superposition of internal energy states
Open for about 9 yearsFoundations and feasibility of torsion-balance tests of the weak equivalence principle for matter in quantum-superposition states
Open for less than 1 yearReconciling finite-temperature equivalence-principle violations with the gravitationally coupled Dirac equation for particles and antiparticles
Open for about 6 yearsDoes the weak equivalence principle survive full deformed-special-relativity frameworks? Extending the modified-dispersion-relation analysis beyond the one-particle sector
Open for about 1 yearTightening Weak Equivalence Principle limits on neutrinos versus photons from blazar timing: controlling intrinsic emission-time offsets and distance uncertainties
Open for about 38 yearsCompleting the peculiar-acceleration power-spectrum test of the weak equivalence principle on cosmological scales: sensitivity to realistic violations, relativistic modeling, and observational feasibility
Open for about 1 year
Low-density phase and high-density phase4 questions
Phase transitions in the Aristoff–Radin lattice model of quasicrystals: rigorous existence, order, and the temperature–chemical-potential phase diagram
Melting density and nature of the fluid-solid transition in the Bowen-Lyons-Radin-Winkler zipper-molecule hard-core model
Hexatic order and two-step melting at large exclusion range in the triangular-lattice k-NN hard-core lattice gas, and the algorithms to reach it
Order of the entropy-driven order-disorder (fluid-crystal) transition in non-sliding hard-core lattice gases
Is the low-energy ionic biological effect caused by direct action?7 questions
Cell-cycle-resolved quantification and validation of the direct-action contribution to mammalian cell killing by ionizing radiation (the DABBLE framework)
Open for about 5 yearsMechanism of very-low-energy ion-induced DNA damage and mutation: anomalous nitrogen-over-argon effectiveness and unquantified secondary-electron, UV, and X-ray channels
Open for about 17 yearsDNA damage by low-energy ions: species and charge-state scaling, strand-break mechanisms, and hydrated and cellular relevance
Open for about 17 yearsCausal mechanisms of low-energy ion beam mutagenesis in bacteria: quantifying direct energy deposition versus indirect radical chemistry and mechanistically explaining in vivo mutation spectra
Open for about 19 yearsMechanism of low-keV argon-ion-induced developmental delay in Caenorhabditis elegans larvae: attribution among reactive oxygen species, DNA-damage responses, and cuticle surface damage
Open for about 15 yearsCausal agents, thresholds, and dose-response of mutation induction by plasma immersion low-energy-ion bombardment of naked DNA
Open for about 16 yearsQuantitative mechanism of ultra-low-energy ion-induced DNA strand breaks: direct atomic collisions versus secondary processes
Open for about 13 years
Absorption and isolation of low-frequency sound waves4 questions
Nonlinear active electroacoustic impedance control beyond the cubic single-degree-of-freedom resonator: multi-degree-of-freedom absorbers and negative-effective-bulk-modulus nonlinear active acoustic metamaterials
Open for about 7 yearsPredictive, as-manufactured modeling of the hybrid perforated-hemispherical-shell and membrane acoustic metamaterial: the unexplained 552 Hz absorption peak and the theory–experiment bandwidth discrepancy
Open for about 2 yearsUnstudied high-frequency sound-insulation peaks of the labyrinth-type Helmholtz–thin-film compound acoustic metamaterial
Open for about 1 yearExact simultaneous critical coupling of all resonances in a discrete Helmholtz-resonator array while retaining band-averaged absorption
Open for about 6 years
Stability of electrorheological and magnetorheological fluids5 questions
Stability–performance tradeoff in zeolite/silicone-oil electrorheological fluids: surfactant and acoustic-stirring stabilization versus retained ER yield stress and response time
Open for about 13 yearsMolecular-scale verification of the binding mechanism between PAA-coated SPIONs and fatty-acid-coated carbonyl iron in bidisperse magnetorheological fluids
Open for about 6 yearsControlling Factors of Time Instability and the Sedimentation-Performance Trade-off in Ferrofluid-Based Three-Disperse Magnetorheological Fluids
Open for about 5 yearsLong-term durability and lifetime design rules for gel-structured electrorheological materials in shear-mode damping devices
Open for about 13 yearsSedimentation–redispersibility trade-off in concentrated iron-based magnetorheological fluids: a predictive framework and rational additive design
Open for about 20 years
Reversible resistance change phenomenon caused by electric pulses4 questions
Quantitative closure of the oxygen-diffusion model for electric-pulse-induced resistance (EPIR) switching in Pr0.7Ca0.3MnO3: direct oxygen-vacancy transport parameters and the mechanism of pulse-enhanced ionic mobility
Open for about 20 yearsPhysical origin of the mode-dependent reliability asymmetry between unipolar and bipolar resistive switching in Ag/ZnMn2O4/p+-Si devices
Open for about 7 yearsMicroscopic origin and spatial location of electric-pulse-induced resistance switching at a tungsten point contact on an individual ZnO nanotube
Open for about 16 yearsMicroscopic origin of the ferroelectric-buffer-enhanced electric-pulse-induced resistance (EPIR) switching in Pr0.7Ca0.3MnO3 films: ferroelectric field effect versus ionic redistribution
Open for about 19 years
Electron and atomic nucleus scattering4 questions
Constraining the shell-versus--cluster composition of the C and O ground states through density-profile-sensitive elastic scattering
Open for about 3 yearsValidating and correcting the GENIE event generator's quasielastic nuclear models against (e,e'p) reduced cross sections and nuclear transparency
Open for about 1 yearSimultaneous microscopic description of charge radii and parity-violating asymmetries in Ca and Pb: resolving the CREX–PREX tension and the model dependence of neutron-skin extraction from parity-violating electron scattering
Open for about 4 yearsCharge properties of deformed halo nuclei: deformed relativistic Hartree-Bogoliubov theory in continuum with intrinsic electromagnetic structure corrections
Open for less than 1 year
Elliptic parametrization of symmetric biquadratic relations2 questions
Degenerate biquadratic regimes for the string-equation Dirichlet problem: John-mapping periodicity, Poncelet dynamics, and the Pell-Abel correspondence
Ladder operators, bispectral algebra, and degenerations of the biorthogonal rational functions on elliptic grids: completing the rational-function analogue of the Askey-Wilson framework
Symmetry and symmetry-breaking mechanisms5 questions
Controlled manipulation of the two symmetry-broken phase states and a first-principles effective model of the driven-dissipative space-time crystal
Open for about 5 yearsFate of coherent-beam-driven spin symmetry breaking and entropy production in a spinor Bose-Einstein condensate beyond the fully decoherent limit
Open for about 6 yearsUniversality class of the continuous Q-QL transition: criticality-enabled U(1) symmetry breaking in 1D spin chains and 1+1D field theory
Open for about 1 yearStructure, topology, and differential surface tension of inhomogeneous chiral condensates in the chiral limit of QCD from constrained simulations
Open for about 4 yearsOpen problems for modulated-symmetry SPT chains: phase transitions, realistic realizations, and bundle-symmetry structure
Open for about 2 years
Diagonal and non-diagonal integrable boundaries3 questions
Integrable boundary interactions of open SU(4) alternating spin chains: classification beyond the SU(2)×SU(2)-preserving class and higher-rank SU(N) extension
Nested off-diagonal Bethe ansatz for the () spin chain with generic non-diagonal open boundaries
Integrable non-factorizable boundaries in doubled-space quantum circuits: classification beyond spin-1/2 free fermions, replica couplings, Bethe-ansatz spectra, and Lindblad form
How exactly do the turbulent fluctuation fields in convective warm clouds affect the formation of large cloud droplets?10 questions
Gelation-time statistics of the sol–gel transition in turbulent droplet collision–coalescence and their link to warm-rain initiation
Open for about 14 yearsTurbulence-modulated collisional growth of cloud droplets toward rain initiation: realistic collision efficiencies, growth-time fluctuations, and the atmospheric Reynolds-number extrapolation
Open for about 70 yearsDo caustic-driven droplet voids and phase-change feedback operate at deep-convective-cloud Reynolds numbers ()?
Open for about 4 yearsTurbulent collision-coalescence of cloud droplets: validated parameterizations of the geometric kernel, collision efficiency, Reynolds-number extrapolation, and stochastic-coalescence moment closures for cloud-scale models
Open for about 20 yearsValidation and coupled nonlinear quantification of the tangling-clustering instability as a mechanism of rapid raindrop formation in turbulent stratified atmospheric clouds
Open for about 12 yearsConstraining the turbulent collision–coalescence kernel at cloud Reynolds numbers: the turbulence enhancement of warm-rain autoconversion in precipitating shallow convection
Open for about 15 yearsOpen directions in direct Lagrangian simulation of turbulent droplet growth in vertically developing clouds: evolving turbulence, collision–condensation feedback, and microphysical robustness
Open for less than 1 yearFate of turbulence-driven continuous growth of cloud droplet size variance by condensation under realistic activation, entrainment, and collision coupling
Open for about 11 yearsWhich turbulent collision kernel (Ayala–Wang or Onishi) is realistic at cloud Reynolds numbers?
Open for about 9 yearsConsistent collision efficiencies for quantitative evaluation of turbulence-enhanced droplet collision–coalescence growth at high dissipation rates
Open for about 8 years
Spectral expansion of multi-point functions4 questions
Do the Matsubara two-particle irreducible vertex divergences persist on the real-frequency axis?
Analytic long-time and long-distance asymptotics of finite-temperature order-parameter correlations in the anisotropic quantum XY chain
Convergence of the form-factor series for the multipoint correlation functions of the 1+1-dimensional sinh-Gordon model
Convergence of form factor expansions in 1+1-dimensional integrable quantum field theories beyond space-like two-point functions of sinh-Gordon
Multi-point joint distribution2 questions
Physics of multiferroics2 questions
Electric-field switching of out-of-plane polarization in the metallic two-dimensional ferroelectric oxynitride monolayer Tl2NO2 and quantification of magnetoelectric coupling in its WTe2 heterostructure
Open for about 4 yearsStacking-controlled multiferroicity in bilayer ScI: robustly determining and experimentally realizing the predicted interlayer magnetic switching
Open for less than 1 year