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assuming that dark matter (dm) efficiently clusters on various scales we analyse the possible impact on direct dm searches. for certain sizes and densities of dm clusters, mutual detector-cluster encounters may occur only once a year or every several years leading to the apparent failure of individual experiments searc... | dark matter clusters and time correlations in direct detection experiments |
this thesis describes the search for dark matter at the lhc in the mono-jet plus missing transverse momentum final state, using the full dataset recorded in 2012 by the atlas experiment. it is the first time that the number of jets is not explicitly restricted to one or two, thus increasing the sensitivity to new signa... | searching for dark matter with the atlas detector |
we demonstrate a superconducting (sc) microwave (mw) cavity that can accelerate the dark matter search by maintaining superconductivity in a high dc magnetic field. we used high-temperature superconductor (htsc) yttrium barium copper oxide (ybco) with a phase transition temperature of 90k to prevent sc failure by the m... | high quality factor high-temperature superconducting microwave cavity development for the dark matter axion search in a strong magnetic field |
we present a classically scale-invariant model where the dark matter, neutrino and electroweak mass scales are dynamically generated from dimensionless couplings. the standard model gauge sector is extended by a dark $su(2)_x$ gauge symmetry that is completely broken through a complex scalar doublet via the coleman-wei... | dark matter and neutrino masses from a classically scale-invariant multi-higgs portal |
in this paper, we investigate the possibility of testing the weakly interacting massive particle (wimp) dark matter (dm) models by applying the simplest phenomenological model which introduces an interaction term between dark energy (de) and wimp dm, i.e., q = 3γdmhρdm. in general, the coupling strength γde is close to... | a new way to test the wimp dark matter models |
a dual-phase xenon time-projection chamber was built at nikhef in amsterdam as a direct dark matter detection r&d facility. in this paper, the setup is presented and the first results from a calibration with a 22na gamma-ray source are presented. the results show an average light yield of (5.6 ± 0.3) photoelectrons... | commissioning of a dual-phase xenon tpc at nikhef |
we consider a feeble repulsive interaction between ordinary matter and dark matter, with a range similar to or larger than the size of the earth. dark matter can thus be repelled from the earth, leading to null results in direct detection experiments, regardless of the strength of the short-distance interactions of dar... | dark matter repulsion could thwart direct detection |
the nature of dark matter (dm) remains a mystery since it has so far eluded detection in the laboratory. to that end, the large underground xenon (lux) experiment was built to directly observe the interaction of dm with xenon target nuclei. lux acquired data from april 2013 to may 2016 at surf in south dakota, which le... | sub-gev dark matter searches and electric field studies for the lux and lz experiments |
the sodium iodide active background rejection experiment-south (sabre-south) is a direct dark matter detector soon to be deployed in the stawell gold mine, in victoria, australia. monitoring of external environmental and experimental conditions, (temperature, barometric pressure, relative humidity, high voltage, and se... | a scalable and reconfigurable industrial-grade slow control system for sabre-south dark matter experiment |
the lz collaboration aims to directly detect dark matter by using a liquid xenon time projection chamber (tpc). in order to probe the dark matter signal, observed signals are compared with simulations that model the detector response. the most computationally expensive aspect of these simulations is the propagation of ... | gpu simulation with opticks: the future of optical simulations for lz |
this book is about dark matter's particle nature and the implications of a new symmetry that appears when a hypothetical dark matter particle is heavy compared to known elementary particles. dark matter exists and composes about 85% of the matter in the universe, but it cannot be explained in terms of the known element... | heavy wimp effective theory: formalism and applications for scattering on nucleon targets |
we show that the baryon-dark-matter coincidence problem can be solved in the constrained minimal supersymmetric model. baryons and dark matter are generated simultaneously through the late-time decay of nontopological solitons, q-balls, which are formed after the affleck-dine baryogenesis. a certain relation between th... | solution to the baryon-dark-matter coincidence problem in the constrained minimal supersymmetric model with a 126-gev higgs boson |
thermal freeze-out of a weakly interacting massive particle is the dominant paradigm for dark matter production. this scenario is now being probed by direct and indirect detection experiments, as well as at colliders. the lack of convincing signals motivates us to consider alternative scenarios. in this contribution we... | dark matter models beyond the wimp paradigm |
an ever-increasing amount of evidence suggests that approximately one quarter of the energy in the universe is composed of some non-luminous, and hitherto unknown, "dark matter". physicists from numerous sub-fields have been working on and trying to solve the dark matter problem for decades. the common solution is the ... | low-mass dark matter search results and radiogenic backgrounds for the cryogenic dark matter search |
we propose a minimal model of a fermionic dark matter with a pseudoscalar mediator and n generation of vector-like quarks. we calculate the relic density and obtain a new constraint on the generation of the vector-like quarks. from the viewpoint of phenomenology, we probe the proposed model via direct and indirect appr... | search for vector-like quarks in a fermionic dark matter model with pseudoscalar: a resonance case |
previous work has argued that, in the framework of plasma dark matter models, the dama annual modulation signal can be consistently explained with electron recoils. in the specific case of mirror dark matter, that explanation requires an effective low velocity cutoff, $v_c \gtrsim 30,000$ km/s, for the halo mirror elec... | shielding of a direct detection experiment and implications for the dama annual modulation signal |
we present experimental results concerning the direct excitation of the magnetisation in a photon-magnon hybrid system composed of a microwave cavity and an embedded yttrium iron garnet (yig) sphere. an 11 ps ultrafast pulsed laser, with wavelength of 1064 nm outside the yig transparence window, directly excite the mag... | direct excitation of the magnetisation in photon-magnon hybrid systems with an infrared laser pulse |
we propose a minimal model of a fermionic dark matter with a pseudoscalar mediator and n generation of vector-like quarks. we calculate the relic density and obtain new constraint on the generation of the aforementioned quarks. concerning phenomenological aspects, we probe the presenting model via direct and indirect a... | searching for vector-like quarks in a fermionic dark matter model with pseudoscalar: a resonance case |
a two-phase argon detector is generally suitable for the direct detection of weakly interacting massive particle (wimp) dark matter owing to its high rejection power against electron recoil background events. however, ionization signal (s2) has not been effectively used for argon in current experiments because its basi... | study of the low-energy er/nr discrimination and its electric-field dependence with liquid argon |
experimental observations and theoretical arguments at galaxy and larger scales have suggested that a large fraction of the universe is composed by dark matter (dm) particles. this has motivated the dama experimental efforts to investigate the presence of such particles in the galactic halo by exploiting a model indepe... | dama/libra-phase1 model independent results |
in the past years the spotlight of the search for dark matter particles widened to the low mass region, both from theoretical and experimental side. we discuss results from data obtained in 2013 with a single detector tum40. this detector is equipped with a new upgraded holding scheme to efficiently veto backgrounds in... | the cresst dark matter search - status and perspectives |
damascus calculates the density and velocity distribution of dark matter (dm) at any detector of given depth and latitude to provide dark matter particle trajectories inside the earth. provided a strong enough dm-matter interaction, the particles scatter on terrestrial atoms and get decelerated and deflected. the resul... | damascus: dark matter simulation code for underground scatterings |
the china dark matter experiment (cdex) is located at the china jinping underground laboratory (cjpl) and aims to directly detect the weakly interacting massive particles (wimp) flux with high sensitivity in the low mass region. here we present a study of the predicted photon and electron backgrounds including the back... | study of the material photon and electron background and the liquid argon detector veto efficiency of the cdex-10 experiment |
in this conference paper, i give an overview of the capabilities of darkbit, a module of the gambit global fitting code that calculates a range of dark matter observables and corresponding experimental likelihood functions. included in the code are limits from the dark matter relic density, multiple direct detection ex... | an overview of darkbit, the gambit dark matter module |
the seesaw and leptogenesis commonly depend on the masses of same particles, and thus are both realized at the same scale. in this work, we demonstrate a new possibility to realize a tev-scale neutrino seesaw and a natural high-scale leptogenesis. we extend the standard model by two gauge-singlet scalars, a vector-like... | tev scale neutrino mass generation, minimal inelastic dark matter, and high scale leptogenesis |
we discuss strategies to make inferences on the thermal relic abundance of a weakly interacting massive particle (wimp) when the same effective dimension-six operator that explains an experimental excess in direct detection is assumed to drive decoupling at freeze-out, and apply them to the explicit scenario of wimp in... | from direct detection to relic abundance: the case of proton-philic spin-dependent inelastic dark matter |
the influence of the transient thermal effects on the partition of the energy of selfrecoils in germanium and silicon into energy eventually given to electrons and to atomic recoils respectively is studied. the transient effects are treated in the frame of the thermal spike model, which considers the electronic and ato... | contribution of the electron-phonon interaction to lindhard energy partition at low energy in ge and si detectors for astroparticle physics applications |
abundant evidence from cosmological and astrophysical observations suggests that the standard model does not describe 84% of the matter in our universe. the nature of this dark matter (dm) remains a mystery since it has so far eluded detection in the laboratory. to that end, the large underground xenon (lux) experiment... | sub-gev dark matter searches and electric field studies for the lux and lz experiments |
merging galaxy clusters such as the bullet cluster provide a powerful testing ground for indirect detection of dark matter. the spatial distribution of the dark matter is both directly measurable through gravitational lensing and substantially different from the distribution of potential astrophysical backgrounds. we p... | towards a bullet-proof test for indirect signals of dark matter |
in many scalar dark matter models an imposed discrete symmetry will result in cp conservation. we present results for the 3hdm, the standard model with two additional inert doublets, where it is possible to have cp-violating effects and a stable dark matter candidate. we discuss the new regions of dm relic density open... | dark matter and cp-violation in the three-higgs doublet model |
for many dark matter models, the annihilation cross section to two-body final states is difficult to probe with current experiments because the dominant annihilation channel is velocity or helicity suppressed. the inclusion of gauge boson radiation for three-body final states can lift the helicity suppression, allowing... | indirect detection of the partial p wave via the s wave in the annihilation cross section of dark matter |
although the existence of dark matter is well established by many astronomical measurements, its nature still remains one of the unsolved puzzles of particles physics. the unprecedented energy reached by the large hadron collider (lhc) at cern has allowed exploration of previously unaccessible kinematic regimes in the ... | searches for dark matter in atlas |
an overview of recent developments in supersymmetry, supergravity and unification and prospects for supersymmetry discovery at the current and future high energy colliders and elsewhere are discussed. currently several empirical data point to supersymmetry as an underlying symmetry of particle physics. these include th... | supersymmetry unification, naturalness, and discovery prospects at hl-lhc and he-lhc |
we study self-conjugate dark matter (dm) particles interacting primarily with standard model (sm) leptons in an effective field theoretical framework. we consider sm gauge-invariant effective contact interactions between majorana fermion, real scalar and real vector dm with leptons by evaluating the wilson coefficients... | effective field theory approach to lepto-philic self-conjugate dark matter |
in this contribution, ctas potential role in detection of particle dark matter in the context of other detection approaches is briefly discussed for an audience of gamma-ray astronomers. in particular searches for new particles at the large hadron collider and detection of dark matter particles in deep underground dete... | cta in the context of searches for particle dark matter - a glimpse |
the neutralino dark matter (dm) predicted by the minimal supersymmetric standard model (mssm) has been probed in several search modes at the large hadron collider (lhc), one of the leading ones among which is the trilepton plus missing transverse momentum channel. the experimental analysis of this mode has, however, be... | closing in on the wino lsp via trilepton searches at the lhc |
the qcd axion is a particle postulated to exist since the 1970s to explain the strong-cp problem in particle physics. it could also account for all of the observed dark matter in the universe. the axion resonant interaction detection experiment (ariadne) experiment intends to detect the qcd axion by sensing the fictiti... | a method for controlling the magnetic field near a superconducting boundary in the ariadne axion experiment |
cresst is a multi-stage experiment directly searching for dark matter (dm) using cryogenic $\mathrm{cawo_4}$ crystals. previous stages established leading limits for the spin-independent dm-nucleon cross section down to dm-particle masses $m_\mathrm{dm}$ below $1\,\mathrm{gev/c^2}$. furthermore, cresst performed a dedi... | search for low-mass dark matter with the cresst experiment |
we study the collider, astrophysical and cosmological constraints on the dark matter sector of a conformal model within the framework of both the freeze out as well as the freeze in mechanism. the model has a dark sector with strong self interactions. this sector couples weakly with the standard model (sm) particles vi... | cosmological dark matter in a conformal model |
dark matter that was once in thermal equilibrium with the standard model is generally prohibited from obtaining all of its mass from the electroweak or qcd phase transitions. this implies a new scale of physics and mediator particles needed to facilitate dark matter annihilations. in this work, we consider scenarios wh... | perturbative unitarity constraints on charged/colored portals |
the cresst-iii experiment, located in the gran sasso underground laboratory (lngs, italy), aims at the direct detection of dark matter (dm) particles. scintillating cawo4 crystals operated as cryogenic detectors are used as target material for dm-nucleus scattering. the simultaneous measurement of the phonon signal fro... | direct dark matter search with the cresst-iii experiment - status and perspectives |
please see the pdf file for details. | erratum: casting a wide signal net with future direct dark matter detection experiments erratum: casting a wide signal net with future direct dark matter detection experiments |
i study the possibility of directly detecting ultra-high energy (uhe from now on) wimps by the icecube experiment, via the wimps interaction with the nuclei in the ice. i evaluate galactic and extragalactic uhe wimp and astrophysical and atmospheric neutrino event rates at energy range of 10 tev-10 pev. i assume uhe wi... | directly search for ultra-high energy wimps at icecube |
we review the phenomenology of susy dark matter in various versions of mssm, with universal and nonuniversal gaugino masses at the gut scale. we start with the universal case, where the cosmologically compatible dark matter relic density is achieved only over some narrow regions of parameter space, involving some fine-... | susy dark matter in universal and nonuniversal gaugino mass models |
in the present work we study the branon dark matter particles impact on compact objects, and we provide the first constraints of the parameter space using white dwarf stars. the branon dark matter model is characterized by two free parameters, namely the branon mass particle m and the brane tension factor f . the latte... | constraining the parameter space of branon dark matter using white dwarf stars |
dark matter (dm) remains a vital, but elusive, component in our current understanding of the universe. accordingly, many experimental searches are devoted to uncovering its nature. however, both the existing direct detection methods, and the prominent $\gamma$-ray search with the fermi large area telescope (fermi-lat),... | multi-frequency search for dark matter: the role of hess, cta, and ska |
detectors based upon the noble elements, especially liquid xenon as well as liquid argon, as both single- and dual-phase types, require reconstruction of the energies of interacting particles, both in the field of direct detection of dark matter (weakly interacting massive particles or wimps, axions, etc.) and in neutr... | a review of basic energy reconstruction techniques in liquid xenon and argon detectors for dark matter and neutrino physics using nest |
local dark matter density, ρdm, is one of the crucial astrophysical inputs for the estimation of detection rates in dark matter direct search experi- ments. knowing the value also helps us to investigate the shape of the galactic dark halo, which is of importance for indirect dark matter searches, as well as for variou... | determination of the local dark matter density using k-dwarfs from gaia dr2 |
dark matter is a type of matter hypothesized in astronomy and cosmology to account for a large part of the mass that appears to be missing from the universe. china dark matter experiment (cdex) is a direct detection system of dark matter. a cryogenic system for cdex-10 has been designed and constructed. this note descr... | cryogenic system of china dark matter experiment (cdex-10) |
we describe a new detector capable of directly measuring dark matter particles with masses as low as 1 mev/c 2. the detector is based on the quantum evaporation of helium atoms from the surface of liquid helium and their detection using field ionization. when a dark matter particle collides with an atom in liquid heliu... | development of a dark matter detector that uses liquid he and field ionization |
in these proceedings we review the interplay between lhc searches for dark matter and direct detection experiments. for this purpose we consider two prime examples: the effective field theory (eft) approach and the minimal supersymmetric standard model (mssm). in the eft scenario we show that for operators which do not... | dark matter: connecting lhc searches to direct detection |
damascus-crust determines the critical cross-section for strongly interacting dm for various direct detection experiments systematically and precisely using monte carlo simulations of dm trajectories inside the earth's crust, atmosphere, or any kind of shielding. above a critical dark matter-nucleus scattering cross se... | damascus-crust: dark matter simulation code for underground scatterings - crust edition |
we analyze the parametric space of the constrained minimal supersymmetric standard model with μ >0 supplemented by a generalized asymptotic yukawa coupling quasiunification condition which yields acceptable masses for the fermions of the third family. we impose constraints from the cold dark matter abundance in the ... | probing the hyperbolic branch/focus point region of the constrained minimal supersymmetric standard model with generalized yukawa quasiunification |
we studied the interplay between the mass reach for electroweakinos at future hadron colliders and direct detection experiments. the lack of new phenomena at the lch motivates us to focus on split supersymmetry scenarios with different electroweakino spectra. a 100 tev hadron collider may reach masses up to 3 tev in mo... | searching susy from below |
the hypothesis of dark matter interacting with the standard model uniquely via the higgs portal is severely challenged by experiments. however, if dark matter is a fermion, the higgs-portal interaction implies the presence of mediators, which can change the phenomenology significantly. this article discusses the impact... | probing higgs-portal dark matter with weakly interacting mediators |
future large liquid argon direct dark matter detectors can benefit greatly from an efficient surface background rejection technique. to aid the development of these large scale detectors a test stand, argon-1, has been constructed at carleton university, ottawa, canada, in the noble liquid detector development lab. it ... | surface background rejection technique for liquid argon dark matter detectors using a thin scintillating layer |
lux (large underground xenon) was a dark matter experiment, which was housed at the sanford underground research facility (surf) in south dakota until late 2016, and previously set world-leading limits on weakly interacting massive particles (wimps), axions and axion-like particles (alps). this proceeding presents an o... | latest results of the lux dark matter experiment |
electroluminescence and electron avalanching are the physical effects used in two-phase argon and xenon detectors for dark mater search and neutrino detection, to amplify the primary ionization signal directly in cryogenic noble-gas media. we review the concepts of such light and charge signal amplification, including ... | electroluminescence and electron avalanching in two-phase detectors |
next-generation dark matter direct detection experiments will explore several orders of magnitude in the dark matter-nucleus scattering cross section below current upper limits. in case a signal is discovered the immediate task will be to determine the dark matter mass and to study the underlying interactions. we devel... | astrophysics-independent determination of dark matter parameters from two direct detection signals |
we study the collider, astrophysical, and cosmological constraints on the dark matter sector of a conformal model within the framework of the freeze-out as well as the freeze-in mechanism. the model has a dark sector with strong self-interactions. this sector couples weakly with the standard model particles via a scala... | cosmological dark matter in a conformal model |
sodium iodide thallium doped (nai(tl)) scintillation detectors have been applied to the direct searches for dark matter since the 1980s and have produced one of the most challenging results in the field—the observation by the dama/libra collaboration of an annual modulation in the detection rate for more than twenty cy... | dark matter searches using nai(tl) at the canfranc underground laboratory: past, present and future |
the signals in dark matter direct-detection experiments should exhibit modulation signatures due to the earth's motion with respect to the galactic dark matter halo. the annual and daily modulations, due to the earth's revolution about the sun and rotation about its own axis, have been explored previously. monthly modu... | monthly modulation in dark matter direct-detection experiments |
dm-ice is a program towards the first direct detection search for dark matter in the southern hemisphere with a 250 kg-scale nai(tl) crystal array. it will provide a definitive understanding of the modulation signal reported by dama by running an array at both northern and southern hemisphere sites. a 17 kg predecessor... | dm-ice: current status and future prospects |
asteroseismology can be used to constrain some properties of dark-matter (dm) particles (casanellas & lopes, 2013). in this work, we performed an asteroseismic modelling of the main-sequence solar-like pulsator kic 2009505 (also known as dushera) in order to test the existence of dm particles with the characteristi... | constraints to dark-matter properties from asteroseismic analysis of kic 2009504 |
an ultra-sensitive opto-mechanical force sensor has been built and tested in the optics laboratory at infn trieste. its application to experiments in the dark energy sector, such as those for chameleon-type wisps, is particularly attractive, as it enables a search for their direct coupling to matter. we present here th... | kwisp: an ultra-sensitive force sensor for the dark energy sector |
the recent direct detection of gravitational waves (gws) from binary black hole mergers (2016, phys. rev. lett. 116, no. 6, 061102; no. 24, 241103) opens up an entirely new non-electromagnetic window into the universe making it possible to probe physics that has been hidden or dark to electromagnetic observations. in a... | nuclear constraints on gravitational waves from deformed pulsars |
in order to test the capabilities of barium fluoride (baf2) crystal for dark matter direct detection, nuclear recoils are studied with mono-energetic neutron beam. the energy spectra of nuclear recoils, quenching factors for elastic scattering neutrons and discrimination capability between neutron inelastic scattering ... | neutron beam test of barium fluoride crystal for dark matter direct detection |
one of the most powerful techniques for direct detection of dark matter via elastic scattering of galactic wimps is the use of liquid argon time projection chambers. atmospheric argon (aar) has a naturally occurring radioactive isotope, 39ar, of cosmogenic origin. the use of argon extracted from underground wells, depr... | dart, a detector for measuring the 39ar depletion factor |
the paper concerns the inverse problem of calculus of variations for one class of elliptic and hyperbolic quasilinear second order equations with two independent variables. the equations of this class have a rather wide range of applications, among which are modeling of a two-conductor transmission line, motion of a hy... | on the inverse variational problem for one class of quasilinear equations |
dispersion curves or band diagrams play a crucial role in examining, analyzing and designing wave propagation in periodic structures. despite their ubiquity and current research interest, introductory papers and reference scripting tailored to novel researchers in the field are lacking. this paper aims to address this ... | a guide to numerical dispersion curve calculations: explanation, interpretation and basic matlab code |
standard application of the seismic ambient noise tomography considers the existence of synchronous records at stations for green's functions retrieval. more recent theoretical and experimental observations showed the possibility to apply correlation of coda of noise correlation (c3) to obtain green's functions between... | enhanced rayleigh waves tomography of mexico using ambient noise cross-correlations (c1) and correlations of coda of correlations (c3) |
full-waveform inversion, seismic hazard analysis, and moment-tensor estimation rely to varying degrees on accurate simulations of seismic wave propagation. the effects of oceans and other bodies of water on the propagation of seismic waves can be significant. in the context of numerical wavefield modelling, it has been... | the effect of water layers on large-scale seismic simulations - an application to the scec ucvm |
in this paper, we consider time-harmonic elastic wave scattering governed by the lamé system. it is known that the elastic wave field can be decomposed into the shear and compressional parts, namely, the pressure and shear waves that are generally coexisting, but propagating at different speeds. we consider the third o... | decoupling elastic waves and its applications |
in this paper, we focus on a new wave equation described wave propagation in the attenuation medium. in the first part of this paper, based on the time-domain space fractional wave equation, we formulate the frequency-domain equation named as fractional helmholtz equation. according to the physical interpretations, thi... | infinite-dimensional bayesian approach for inverse scattering problems of a fractional helmholtz equation |
inferring the solar photospheric magnetic field from zeeman polarization data involves many steps and assumptions, each with varying degree of impact on the accuracy of the result. it has been long known that the treatment of unresolved structures and instrumental scattered light will influence the inferred strength an... | on measuring and mitigating bias in the inferred magnetic field in the helioseismic and magnetic imager and other vector magnetographs |
ultrasound computed tomography (usct) is an emerging medical imaging modality that holds great promise for improving human health. full-waveform inversion (fwi)-based image reconstruction methods account for the relevant wave physics to produce high spatial resolution images of the acoustic properties of the breast tis... | a forward model incorporating elevation-focused transducer properties for 3d full-waveform inversion in ultrasound computed tomography |
the complex helmholtz equation $(\delta + k^2)u=f$ (where $k\in{\mathbb r},u(\cdot),f(\cdot)\in{\mathbb c}$) is a mainstay of computational wave simulation. despite its apparent simplicity, efficient numerical methods are challenging to design and, in some applications, regarded as an open problem. two sources of diffi... | an iterative method for helmholtz boundary value problems arising in wave propagation |
full waveform inversion (fwi) enables us to obtain high-resolution velocity models of the subsurface. however, estimating the associated uncertainties in the process is not trivial. commonly, uncertainty estimation is performed within the bayesian framework through sampling algorithms to estimate the posterior distribu... | physics reliable frugal uncertainty analysis for full waveform inversion |
full wave inversion (fwi) imaging scheme has many applications in engineering, geoscience and medical sciences. in this paper, a surrogate deep learning fwi approach is presented to quantify properties of materials using stress waves. such inverse problems, in general, are ill-posed and nonconvex, especially in cases w... | deep learning surrogate interacting markov chain monte carlo based full wave inversion scheme for properties of materials quantification |
seismic tomography is a powerful tool for understanding earth structure, which uses advanced numerical methods and large volumes of passive seismic data to develop seismic velocity models. tomographic inversions using adjoint methods have previously been applied at global and regional scales. we apply these methods to ... | adjoint tomography of the hikurangi subduction zone and new zealand's north island |
three-dimensional (3d) elastic phononic topological insulator, featuring two-dimensional (2d) surface states, which support the high-efficient and robust elastic wave propagation without backscattering in all spatial dimensions, remains a challenge due to the nature of multiple polarized elastic modes and their complex... | experimental realization of three-dimensional elastic phononic topological insulator |
an overlapped continuous model framework, for the helmholtz wave propagation problem in unbounded regions comprising bounded heterogeneous media, was recently introduced and analyzed by the authors ({\tt j. comput. phys., {\bf 403}, 109052, 2020}). the continuous helmholtz system incorporates a radiation condition (rc)... | analysis and application of an overlapped fem-bem for wave propagation in unbounded and heterogeneous media |
this work considers the propagation of high-frequency waves in highly-scattering media where physical absorption of a nonlinear nature occurs. using the classical tools of the wigner transform and multiscale analysis, we derive semilinear radiative transport models for the phase-space intensity and the diffusive limits... | transport models for wave propagation in scattering media with nonlinear absorption |
local microstructural heterogeneities of elastic metamaterials give rise to non-local macroscopic cross coupling between stress-strain and momentum-velocity, known as willis coupling. recent advances have revealed that symmetry breaking in piezoelectric metamaterials introduces an additional macroscopic cross coupling ... | electro-momentum coupling tailored in piezoelectric metamaterials with resonant shunts |
inverse source problems are central to many applications in acoustics, geophysics, non-destructive testing, and more. traditional imaging methods suffer from the resolution limit, preventing distinction of sources separated by less than the emitted wavelength. in this work we propose a method based on physically inform... | a physically informed deep-learning approach for locating sources in a waveguide |
we present a methodology to perform inverse analysis on reconfigurable topological insulators for flexural waves in plate-like structures. first the unit cell topology of a phononic plate is designed, which offers two-fold degeneracy in the band structure by topology optimization. in the second step, piezoelectric patc... | inverse design of reconfigurable piezoelectric topological phononic plates |
thermodynamic properties of fluids confined in nanopores differ from those observed in the bulk. to investigate the effect of nanoconfinement on water compressibility, we perform water sorption experiments on two nanoporous glass samples while concomitantly measuring the speed of longitudinal and shear ultrasonic waves... | ultrasonic study of water adsorbed in nanoporous glasses |
traumatic axonal injury occurs when loads experienced on the tissue-scale are transferred to the individual axons. mechanical characterization of axon deformation especially under dynamic loads however is extremely difficult owing to their viscoelastic properties. the viscoelastic characterization of axon properties th... | a fractional viscoelastic model of the axon in brain white matter |
waveform inversion is concerned with estimating a heterogeneous medium, modeled by variable coefficients of wave equations, using sources that emit probing signals and receivers that record the generated waves. it is an old and intensively studied inverse problem with a wide range of applications, but the existing inve... | when data driven reduced order modeling meets full waveform inversion |
full waveform inversion (fwi) is one of a family of methods that allows the reconstruction of earth subsurface parameters from measurements of waves at or near the surface. this is a numerical optimization problem that uses the whole waveform information of all arrivals to update the subsurface parameters that govern s... | application of an rbf-fd solver for the helmholtz equation to full-waveform inversion |
environmental noise recordings are commonly applied in seismic microzonation studies. by calculating the h/v spectral ratio, the fundamental frequency of soft terrains overlying a rigid bedrock can be determined (nakamura (1989). in such a simple two-layer system, equation f = n vs/4h (1) links the resonance frequency ... | potential application of environmental noise recordings in geoarchaeological site characterization |
one of the great challenges facing our society is to cope with the increase in natural risks induced by climate change and human activity. the frequency of heavy rains and changes in vegetation cover have intensified over most areas, leading to enhanced risks of landslides and the tsunamis they can generate. rising sea... | challenges in physical modeling of landslides, glaciers, and generated seismic and tsunami waves for hazard assessment |
parameterized flows around active regions can serve as a crucial first order correction to global-scale velocity fields used in flux-transport models. in a previous study, we carefully measured near-surface background meridional flow and differential rotation of the quiet sun. this allows us to measure the near-surface... | parameterized inflows around active regions for flux-transport models |
the magnetorotational instability (mri) is an important process in sufficiently ionized accretion discs, as it can create turbulence that acts as an effective viscosity, mediating angular momentum transport. due to its local nature, it is often analysed in the shearing box approximation with eulerian methods, which oth... | simulating the magnetorotational instability on a moving mesh with the shearing box approximation |
we report on the discovery of an ultrasoft x-ray transient source, 3xmm j152130.7+074916. it was serendipitously detected in an xmm-newton observation on 2000 august 23, and its location is consistent with the center of the galaxy sdss j152130.72+074916.5 (z = 0.17901 and dl = 866 mpc). the high-quality x-ray spectrum ... | an ultrasoft x-ray flare from 3xmm j152130.7+074916: a tidal disruption event candidate |
whilst in galaxy-size simulations, supermassive black holes (smbhs) are entirely handled by sub-grid algorithms, computational power now allows the accretion radius of such objects to be resolved in smaller scale simulations. in this paper, we investigate the impact of resolution on two commonly used smbh sub-grid algo... | bondi or not bondi: the impact of resolution on accretion and drag force modelling for supermassive black holes |
spatially resolved observations of molecular line emission have the potential to yield unique constraints on the nature of turbulence within protoplanetary disks. using a combination of local non-ideal magnetohydrodynamics (mhd) simulations and radiative transfer calculations, tailored to properties of the disk around ... | signatures of mri-driven turbulence in protoplanetary disks: predictions for alma observations |
we present results from the first global 3d mhd simulations of accretion disks in cataclysmic variable (cv) systems in order to investigate the relative importance of angular momentum transport via turbulence driven by the magnetorotational instability (mri) compared with that driven by spiral shock waves. remarkably, ... | global mhd simulations of accretion disks in cataclysmic variables. i. the importance of spiral shocks |
we perform 3d radiation hydrodynamic local shearing-box simulations to study the outcome of gravitational instability (gi) in optically thick active galactic nuclei (agns) accretion disks. gi develops when the toomre parameter qt≲ 1, and may lead to turbulent heating that balances radiative cooling. however, when radia... | 3d radiation hydrodynamic simulations of gravitational instability in agn accretion disks: effects of radiation pressure |
we present a new implementation of the galaxy evolution and assembly (gaea) semi-analytic model, that features an improved modelling of the process of cold gas accretion on to supermassive black hole (smbhs), derived from both analytic arguments and high-resolution simulations. we consider different scenarios for the l... | the rise of active galactic nuclei in the galaxy evolution and assembly semi-analytic model |
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