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detecting and attributing sub-regulatory fugitive emissions in the energy sector remains a priority for industry and environmental groups alike. vehicle-based geochemical emission detection and attribution is seeing increasingly widespread use. in order to distinguish between biogenic and thermogenic emission sources, ... | fugitive emissions attribution via simultaneous measurement of ethane and methane isotopic signature in vehicle-based surveys |
as temperatures increase across the arctic, particularly during the cold seasons, soil carbon may be increasingly vulnerable to microbial mineralization and transfer to the atmosphere as co2. loss of co2 from soils during shoulder (autumn/spring) and winter seasons could greatly alter the annual net ecosystem carbon ba... | quantifying cold season soil co2 emissions in alaska and northwest canada |
as of january 1, 2020, regulated quantitative leak inspection frequency will increase for upstream oil and gas production infrastructure in canada, in an attempt to reduce methane and associated emissions. traditional leak detection methods such as us epa method 21 are expensive and slow, whereas a pproved alternatives... | exploring vehicle-based methane emission rate calculation uncertainty |
space debris and its impact on the near-earth space environment has become a serious problem for active satellites. while modelling and observing make up a large portion of the discussion on how to limit the debris, the order of 'high risk objects' and the impact of an active removal is just as essential. high risk obj... | analysis on the active removal of high-risk objects |
the escalating risk of collisions and the accumulation of space debris in low earth orbit (leo) has reached critical concern due to the ever increasing number of spacecraft. addressing this crisis, especially in dealing with non-cooperative and unidentified space debris, is of paramount importance. this paper contribut... | taking a peek into yolov5 for satellite component recognition via entropy-based visual explanations |
this paper presents a new framework for player valuation in european football by fusing principles from financial mathematics and network theory. the valuation model leverages a "passing matrix" to encapsulate player interactions on the field, utilizing centrality measures to quantify individual influence. unlike tradi... | european football player valuation: integrating financial models and network theory |
as a case study into an algorithmic approach to congressional districting, north carolina provides a lot to explore. statistical modeling has called into question whether recent north carolina district plans are unbiased. in particular, the literature suggests that the district plan used in the 2016 u.s. house of repre... | congressional districting: "rocks-pebbles-sand" |
space is becoming more crowded in low earth orbit due to increased space activity. such a dense space environment increases the risk of collisions between space objects endangering the whole space population. therefore, the need to consider collision avoidance as part of routine operations is evident to satellite opera... | predicting the probability of collision of a satellite with space debris: a bayesian machine learning approach |
future launches are projected to significantly increase both the number of active satellites and aggregate collision risk in low earth orbit (leo). in this paper, a dynamical systems theory approach is used to analyze the effect of launch rate distribution on the stability of the leo environment. a multi-shell, three-s... | a dynamical systems analysis of the effects of the launch rate distribution on the stability of a source-sink orbital debris model |
there is no gold standard for the diagnosis of alzheimer's disease (ad), except from autopsies. unsupervised learning can provide insight into the pathophysiology of ad. a mixture of regressions can simultaneously identify clusters from multiple biomarkers while accounting for within-cluster demographic effects. cerebr... | mixture of regressions with multivariate responses for discovering subtypes in alzheimer's biomarkers with detection limits |
at a time when space debris are already a growing issue in the space sector, the deployment of large constellations, made of hundreds to thousands of satellites, is of concern from an environmental point of view. in the next decade, the space sector will undergo a considerable change as the population of active satelli... | analytical model for collision probability assessments with large satellite constellations |
the identification and characterization of space debris is becoming essential today: over the next few years, more and more satellites will be launched, increasing the population of objects in earth's orbit and the risk of collision. whether geo (geostationary earth orbit), meo (medium earth orbit), or leo (low-earth o... | streak detection challenges for telescope observations of satellites |
near-earth space continues to be the focus of critical services and capabilities provided to the society. with the steady increase of space traffic, the number of resident space objects (rsos) has recently boomed in the context of growing concern due to space debris. the need of a holistic and unified approach for addr... | the resident space objects network: a complex system approach for shaping space sustainability |
pocketqubes are a form factor of highly miniaturized satellites with a body of one or more cubic units of 5 cm. in this paper, the characteristics of pocketqubes in terms of their constraints and their (potential) utility are treated. to avoid space debris and limit collision risk, the orbits of pocketqubes need to be ... | utility and constraints of pocketqubes |
the grieving and self-sabotaging call over ultimate tragedy and lost morals has never stopped whenever human beings, horrified, helpless, but excited, enter into a new era. yet, we tend to forget challenges come with opportunities. the space era is evolving so rapidly that losing the old and familiar imagination over a... | unlocking the value of space debris: an investigation on multi-shell source-sink physical-economical model and space debris value definition |
it is of great interest to quantify the contributions of genetic variation to brain structure and function, which are usually measured by high-dimensional imaging data (e.g., magnetic resonance imaging). in addition to the variance, the covariance patterns in the genetic effects of a functional phenotype are of biologi... | ace of space: estimating genetic components of high-dimensional imaging data |
to predict an epileptic event means the ability to determine in advance the time of the seizure with the highest possible accuracy. a correct prediction benchmark for epilepsy events in clinical applications is a typical problem in biomedical signal processing that helps to an appropriate diagnosis and treatment of thi... | epileptic seizure prediction using pearson's product-moment correlation coefficient of a linear classifier from generalized gaussian modeling |
global scale warming has led to permafrost thaw, which may release large amounts of carbon to the atmosphere as co2 and ch4, potentially accelerating global warming (i.e. a positive feedback). however, uncertainty in the mechanisms controlling carbon mineralization is compounded by concurrent changes in soil hydrology ... | abrupt thaw enhances annual global warming potential of an actively degrading permafrost peatland |
in this paper we consider the use of wide field of view radar sensors such as the murchison widefield array (mwa), a low frequency radio telescope designed for astrophysics and cosmology, for rapid response observations of the debris clouds produced by collisions between objects in earth orbit. with an increasing densi... | simulations of orbital debris clouds due to breakup events and their characterisation using the murchison widefield array radio telescope |
this paper introduces an r package that implements simultaneous non-gaussian component analysis for data integration. sing uses a non-gaussian measure of information to extract feature loadings and scores (latent variables) that are shared across multiple datasets. we describe and implement functions through two exampl... | singr: an r package for simultaneous non-gaussian component analysis for data integration |
in the last decade the space debris issue has been in the spotlight as the number of artificial objects orbiting around the earth is steadily on the growth. currently, about 2.000 of operating satellites are in the orbit, most of which are destined to re-enter the atmosphere and hopefully burn out. the fragmentation of... | debris collision alert system |
neglecting small fragments in space debris evolutionary models can lead to a significant underestimation of the collision risk for operational satellites. however, when scaling down to the millimeter range, the debris population grows to over one million objects, making deterministic approaches too computationally expe... | density-based in-orbit collision risk model extension to any impact geometry |
in canada, offshore oil production facilities are exempt from new methane mitigation requirements that apply to onshore producers. since onshore oil and gas operations have been shown in canada to emit more methane than is reported in the federal inventory, it is reasonable to question methane emission levels, and inte... | airborne emissions of methane at offshore oil platforms in newfoundland and labrador, canada |
the emergence of the operation of small satellite constellations to facilitate high-speed internet across the world is relatively a new technological development to be achieved from lower earth orbit (leo). the outcomes of such advancement in technology will be an essential tool to achieve the united nations' sustainab... | legal challenges on deployment and operation of small satellite constellations |
parameter estimates of gw150914 were obtained using bayesian inference, based on three semi-analytic waveform models for binary black hole coalescences. these waveform models differ from each other in their treatment of black hole spins, and all three models make some simplifying assumptions, notably to neglect sub-dom... | effects of waveform model systematics on the interpretation of gw150914 |
binary black hole systems are among the most important sources for gravitational wave detection. they are also good objects for theoretical research for general relativity. a gravitational waveform template is important to data analysis. an effective-one-body-numerical-relativity (eobnr) model has played an essential r... | waveform model for an eccentric binary black hole based on the effective-one-body-numerical-relativity formalism |
gravitational shockwaves are simple exact solutions of einstein equations representing the fields of ultrarelativistic sources and idealized gravitational waves (shocks). historically, much work has focused on shockwaves in the context of possible black hole formation in high energy particle collisions, yet they remain... | quantum imprints of gravitational shockwaves |
we study and reveal the relation between the electroweak sphaleron energy and the gravitational wave signals from a first-order electroweak phase transition. for the first time, we find that a larger sphaleron energy corresponds to a stronger gravitational wave signal for a sufficiently strong phase transition. we also... | connecting the electroweak sphaleron with gravitational waves |
the ligo and virgo gravitational-wave observatories have detected many exciting events over the past five years. as the rate of detections grows with detector sensitivity, this poses a growing computational challenge for data analysis. with this in mind, in this work we apply deep learning techniques to perform fast li... | complete parameter inference for gw150914 using deep learning |
an explicit example is found showing how a modified theory of gravity can be constrained with the ringdown signals from merger of binary black holes. this has been made possible by the fact that the modified gravitational theory considered in this work has an exact rotating black hole solution and that the correspondin... | constraining modified gravity with ringdown signals: an explicit example |
we study pseudo-goldstone dark matter in the z3 complex scalar singlet model. because the direct detection spin-independent cross section is suppressed, such dark matter is allowed in a large mass range. unlike in the original model stabilized by a parity and due to the cubic coupling of the singlet, the z3 model can a... | gravitational wave signals of pseudo-goldstone dark matter in the z3 complex singlet model |
gravitational-wave observations of coalescing binary systems allow for novel tests of the strong-field regime of gravity. using data from the gravitational wave open science center (gwosc) of the ligo and virgo detectors, we place the first constraints on an effective-field-theory based extension of general relativity,... | gravitational-wave constraints on an effective-field-theory extension of general relativity |
we investigate the production of gravitational waves during preheating after inflation in the common case of field potentials that are asymmetric around the minimum. in particular, we study the impact of oscillons, comparatively long lived and spatially localized regions where a scalar field (e.g., the inflaton) oscill... | gravitational waves from oscillons after inflation |
scientific analysis for the gravitational wave detector lisa will require theoretical waveforms from extreme-mass-ratio inspirals (emris) that extensively cover all possible orbital and spin configurations around astrophysical kerr black holes. however, on-the-fly calculations of these waveforms have not yet overcome t... | adiabatic waveforms from extreme-mass-ratio inspirals: an analytical approach |
while current gravitational wave observations with ground based detectors have been consistent with compact binaries in quasi-circular orbits, eccentric binaries may be detectable by ground-based and space-based instruments in the near future. eccentricity significantly complicates the gravitational wave signal, and we... | a 3pn fourier domain waveform for non-spinning binaries with moderate eccentricity |
we present the first results from an all-sky all-frequency (asaf) search for an anisotropic stochastic gravitational-wave background using the data from the first three observing runs of the advanced ligo and advanced virgo detectors. upper limit maps on broadband anisotropies of a persistent stochastic background were... | all-sky, all-frequency directional search for persistent gravitational waves from advanced ligo's and advanced virgo's first three observing runs |
we investigate first order phase transitions in a holographic setting of five-dimensional einstein gravity coupled to a scalar field, constructing phase diagrams of the dual field theory at finite temperature. we scan over the two-dimensional parameter space of a simple bottom-up model and map out important quantities ... | gravitational waves from a holographic phase transition |
the gravitational wave observations of colliding black holes have opened a new window into the unexplored extreme gravity sector of physics, where the gravitational fields are immensely strong, nonlinear, and dynamical. ten binary black hole merger events observed so far can be used to test einstein's theory of general... | parametrized and inspiral-merger-ringdown consistency tests of gravity with multiband gravitational wave observations |
the violent collisions of black holes provide for excellent test-beds of einstein's general relativity in the strong/dynamical gravity regime. we here demonstrate the resolving power one can gain upon the use of multi-band observations of gravitational waves from both ground- and space-based detectors. we find signific... | multi-band gravitational wave tests of general relativity |
we investigate in details the gravitational wave (gw) from the first-order phase transition (pt) in the extended standard model of particle physics with a dimension-six operator, which is capable of exhibiting the recently discovered slow first-order pt in addition to the usually studied fast first-order pt. to simplif... | the gravitational waves from the first-order phase transition with a dimension-six operator |
the detection of gravitational waves from extreme-mass-ratio inspirals with upcoming space-borne detectors will allow for unprecedented tests of general relativity in the strong-field regime. aside from assessing whether black holes are unequivocally described by the kerr metric, such detections may place constraints o... | gravitational-wave glitches: resonant islands and frequency jumps in nonintegrable extreme-mass-ratio inspirals |
orbital eccentricity is a crucial physical effect to unveil the origin of compact-object binaries detected by ground- and spaced-based gravitational-wave (gw) observatories. here, we perform for the first time a bayesian inference study of inspiral-merger-ringdown eccentric waveforms for binary black holes with nonprec... | bayesian inference of binary black holes with inspiral-merger-ringdown waveforms using two eccentric parameters |
understanding and dealing with inference biases in gravitational-wave (gw) parameter estimation when a plethora of signals are present in the data is one of the key challenges for the analysis of data from future gw detectors. working within the linear signal approximation, we describe generic metrics to predict infere... | noisy neighbours: inference biases from overlapping gravitational-wave signals |
a detection of the stochastic gravitational-wave background (sgwb) from unresolved compact binary coalescences could be made by advanced ligo and advanced virgo at their design sensitivities. however, it is possible for magnetic noise that is correlated between spatially separated ground-based detectors to mimic a sgwb... | detecting a stochastic gravitational-wave background in the presence of correlated magnetic noise |
we study electroweak baryogenesis in the so(6)/so(5) composite higgs model with the third generation quarks being embedded in the 20' representation of so(6). the scalar sector contains one higgs doublet and one real singlet, and their potential is given by the coleman-weinberg potential evaluated from the form factors... | electroweak baryogenesis and gravitational waves in a composite higgs model with high dimensional fermion representations |
we apply machine learning methods to build a time-domain model for gravitational waveforms from binary black hole mergers, called mlgw. the dimensionality of the problem is handled by representing the waveform's amplitude and phase using a principal component analysis. we train mlgw on about o (103) teobresums and seob... | machine learning gravitational waves from binary black hole mergers |
we study gravitational waves emitted by a binary system of nonspinning bodies in a quasicircular inspiral within the framework of einstein-aether theory. in particular, we compute explicitly and analytically the expressions for the time-domain and frequency-domain waveforms, gravitational wave polarizations, and respon... | gravitational waves from the quasicircular inspiral of compact binaries in einstein-aether theory |
the future space-borne gravitational wave (gw) detectors would provide a promising probe for the new physics beyond the standard model that admits the first-order phase transitions. the predictions for the gw background vary sensitively among different concrete particle physics models but also share a large degeneracy ... | gravitational waves from patterns of electroweak symmetry breaking: an effective perspective |
lisa is a space-based mhz gravitational-wave observatory, with a planned launch in 2034. it is expected to be the first detector of its kind, and will present unique challenges in instrumentation and data analysis. an accurate preflight simulation of lisa data is a vital part of the development of both the instrument a... | unified model for the lisa measurements and instrument simulations |
a totally asymptotically free qcd axion model, where all couplings flow to zero in the infinite energy limit, was recently formulated. a very interesting feature of this fundamental theory is the ability to predict some low-energy observables, like the masses of the extra fermions and scalars. here we find and investig... | gravitational waves from fundamental axion dynamics |
left-right symmetry at high energy scales is a well-motivated extension of the standard model. in this paper we consider a typical minimal scenario in which it gets spontaneously broken by scalar triplets. such a realization has been scrutinized over the past few decades chiefly in the context of collider studies. in t... | gravitational waves as a probe of left-right symmetry breaking |
we investigate the reach of the ligo/virgo/kagra detectors in the search for signatures of first-order phase transitions in the early universe. utilizing data from the first three observing runs, we derive constraints on the parameters of the underlying gravitational-wave background, focusing on transitions characteriz... | probing early universe supercooled phase transitions with gravitational wave data |
although gravitational radiation causes inspiralling compact binaries to circularize, a variety of astrophysical scenarios suggest that binaries might have small but non-negligible orbital eccentricities when they enter the low-frequency bands of ground- and space-based gravitational-wave detectors. if not accounted fo... | gravitational-wave phasing for low-eccentricity inspiralling compact binaries to 3pn order |
the advanced ligo and virgo detectors opened a new era to study black holes (bhs) in our universe. a population of stellar-mass binary black holes (bbhs) are discovered to be heavier than previously expected. these heavy bbhs provide us an opportunity to achieve multiband observation with ground-based and space-based g... | multiband observation of ligo/virgo binary black hole mergers in the gravitational-wave transient catalog gwtc-1 |
gravitational wave signals from extreme mass ratio inspirals are a key target for space-based gravitational wave detectors. these systems are typically modeled as a distributionally-forced teukolsky equation, where the smaller black hole is treated as a dirac delta distribution. time-domain solvers often use regulariza... | towards exponentially-convergent simulations of extreme-mass-ratio inspirals: a time-domain solver for the scalar teukolsky equation with singular source terms |
all-sky surveys for isolated continuous gravitational waves present a significant data-analysis challenge. semicoherent search methods are commonly used to efficiently perform the computationally-intensive task of searching for these weak signals in the noisy data of gravitational-wave detectors such as ligo and virgo.... | implementing a semicoherent search for continuous gravitational waves using optimally constructed template banks |
eccentricity is a smoking gun for the formation channel of stellar-mass binary black holes (sbbhs). space-based gravitational wave observatories can determine binary eccentricity to $e_0\gtrsim\mathcal{o}(10^{-4}) $, but the detection of these systems can be very challenging. a targeted search of archival data triggere... | the challenge of eccentricity when observing stellar-mass binary black holes with space-based gravitational wave detectors |
we study the gravitational waves produced by the collision of the bubbles as a probe for the cosmological first order qcd phase transition, considering heavy static quarks. using ads/qcd and the correspondence between a first order hawking-page phase transition and confinement-deconfinement phase transition, we find th... | gravitational waves generated from the cosmological qcd phase transition within ads/qcd |
extreme mass ratio inspirals (emris) are among the most interesting gravitational wave (gw) sources for space-borne gw detectors. however, successful gw data analysis remains challenging due to many issues, ranging from the difficulty of modeling accurate waveforms, to the impractically large template bank required by ... | detecting gravitational waves from extreme mass ratio inspirals using convolutional neural networks |
gravitational waves from a phase transition associated with the generation of the masses of elementary particles are within the reach of future space-based detectors such as lisa. a key determinant of the resulting power spectrum, not previously studied, is the lifetime of the acoustic turbulence which follows. we stud... | decay of acoustic turbulence in two dimensions and implications for cosmological gravitational waves |
gravitational-wave (gw) detectors have begun to observe coalescences of heavy black hole binaries (m ≳50 m⊙) at a consistent pace for the past few years. accurate models of gravitational waveforms are essential for unbiased and precise estimation of source parameters, such as masses and spins of component black holes. ... | constraining the parameters of gw150914 and gw170104 with numerical relativity surrogates |
clustering measurements of gravitational wave (gw) mergers in luminosity distance space can be used in the future as a powerful tool for cosmology. we consider tomographic measurements of the angular power spectrum of mergers both in an einstein telescope-like detector network and in some more advanced scenarios (more ... | gravitational wave mergers as tracers of large scale structures |
extreme-mass-ratio inspirals (emris) are important gravitational-wave (gw) sources for future space-based detectors. the standard model consists of one stellar-mass black hole spiraling into a supermassive one, and such a process emits low-frequency ( 10-3 hz) gws, which contain rich information about the space-time ge... | extreme-mass-ratio inspirals produced by tidal capture of binary black holes |
the last gravitational waves emitted in the coalescence of two black holes are quasinormal ringing modes of the merged remnant. in general relativity, the mass and the spin of the remnant black hole uniquely determine the frequency and damping time of each radiated mode. the amplitudes of these modes are determined by ... | exciting black hole modes via misaligned coalescences. i. inspiral, transition, and plunge trajectories using a generalized ori-thorne procedure |
precise measurements of the displacement of, and force acting on, a mechanical oscillator can be performed by coupling the oscillator to an optical cavity. brownian thermal forces represent a fundamental limit to measurement sensitivity which impedes the ability to use precise force measurements as a tool of fundamenta... | attonewton-meter torque sensing with a macroscopic optomechanical torsion pendulum |
the tianqin project is aiming at gravitational wave (gw) detection in space. tianqin gw observatory comprises three satellites orbiting on 1 × 105 km earth orbits to form an equilateral-triangle constellation. in order to minimize the variations in arm lengths and breathing angles, the satellites must be launched and a... | the facilities and performance of tianqin laser ranging station |
we discuss the energy loss due to gravitational radiation of binaries composed of exotic objects whose horizon boundary conditions are replaced with reflective ones. our focus is on the extreme mass-ratio inspirals in which the central heavier black hole is replaced with an exotic compact object. we show, in this case,... | oscillations in the extreme mass-ratio inspiral gravitational wave phase correction as a probe of a reflective boundary of the central black hole |
space-borne gravitational wave detectors can detect sources like the merger of massive black holes. the rapid identification and localization of the source would play a crucial role in multi-messenger observation. the geocentric orbit of the space-borne gravitational wave detector, tianqin, makes it possible to conduct... | near real-time gravitational wave data analysis of the massive black hole binary with tianqin |
searching for departures from general relativity (gr) in more than one post-newtonian (pn) phasing coefficients, called a multiparameter test, is known to be ineffective given the sensitivity of the present generation of gravitational-wave detectors. strong degeneracies in the parameter space make the outcome of the te... | parametrized tests of post-newtonian theory using principal component analysis |
we explore the capabilities of a future proton collider to probe the nature of the electro-weak phase transition, following the hypothetical discovery of a new scalar particle. we focus on the real singlet scalar field extension of the standard model, representing the most minimal, and challenging to probe, framework t... | the electro-weak phase transition at colliders: discovery post-mortem |
the detection of gravitational waves from extreme mass ratio inspirals (emris) by the future space-based gravitational-wave detectors demands the generation of accurate enough waveform templates. since the spin of the smaller secondary body cannot be neglected for the detection and parameter estimation of emris, we stu... | adiabatic equatorial inspirals of a spinning body into a kerr black hole |
the exact properties of dark matter remain largely unknown despite the accumulating evidence. if dark matter is composed of weakly interacting massive particles, it would be accreted by the black hole in the galactic center and form a dense, cuspy spike. dynamical friction from this spike may have observable effects in... | probing dark matter spikes via gravitational waves of extreme-mass-ratio inspirals |
computing signal-to-noise ratios (snrs) is one of the most common tasks in gravitational-wave data analysis. while a single snr evaluation is generally fast, computing snrs for an entire population of merger events could be time consuming. we compute snrs for aligned-spin binary black-hole mergers as a function of the ... | gravitational-wave signal-to-noise interpolation via neural networks |
gravitational waveforms for compact binary coalescences (cbcs) have been invaluable for detections by the ligo-virgo collaboration. they are obtained by a combination of semi-analytical models and numerical simulations. so far systematic errors arising from these procedures appear to be less than statistical ones. howe... | compact binary coalescences: constraints on waveforms |
gravitational wave detections offer insights into the astrophysical populations of black holes in the universe and their formation processes. detections of binaries consisting of black holes lying outside the bulk distribution of the astrophysical population are particularly intriguing. in this study, we perform an inj... | measurability of precession and eccentricity for heavy binary-black-hole mergers |
we study the properties of the gravitational wave (gw) signals produced by first order phase transitions during the inflation era. we show that the power spectrum of the gw oscillates with its wave number. this signal can be observed directly by future terrestrial and spatial gravitational wave detectors and through th... | a unique gravitational wave signal from phase transition during inflation |
in this work we present the results of a search for continuous gravitational waves from the galactic center using ligo o2 data. the search uses the band-sampled-data directed search pipeline, which performs a semicoherent wide-parameter-space search, exploiting the robustness of the frequencyhough transform algorithm. ... | directed search for continuous gravitational-wave signals from the galactic center in the advanced ligo second observing run |
recent discoveries of gravitational wave (gw) signals from astrophysical compact binary systems of neutron stars and black holes have firmly established them as prime sources for advanced gw detectors. theoretical templates of expected signals from such systems have been used to filter the detector data using the match... | effectual template banks for upcoming compact binary searches in advanced-ligo and virgo data |
drastic changes in the early universe such as first-order phase transition can produce a stochastic gravitational wave (gw) background. we investigate the testability of a scale invariant extension of the standard model (sm) using the gw background produced by the chiral phase transition in a strongly interacting qcd-l... | gravitational waves from hidden qcd phase transition |
drag-free control (dfc) is one of the key technologies for space-borne gravitational wave detectors. for the tianqin (tq) project, non-gravitational disturbances on the spacecraft must be suppressed by dfc. tianqin-1 (tq-1) is the first satellite for technology verification, whose main goal is to verify the disturbance... | drag-free control design and in-orbit validation of tianqin-1 satellite |
we present a novel machine-learning approach to estimate selection effects in gravitational-wave observations. using techniques similar to those commonly employed in image classification and pattern recognition, we train a series of neural-network classifiers to predict the ligo/virgo detectability of gravitational-wav... | gravitational-wave selection effects using neural-network classifiers |
we study the properties of gravitational wave (gw) signals produced by first-order phase transitions during the inflation era. we show that the power spectrum of a gw oscillates with its wave number. this signal can be observed directly by future terrestrial and spatial gw detectors and through the b-mode spectrum in t... | a unique gravitational wave signal from phase transition during inflation |
coalescing compact binaries emitting gravitational wave (gw) signals, as recently detected by the advanced ligo-virgo network, constitute a population over the multidimensional space of component masses and spins, redshift, and other parameters. characterizing this population is a major goal of gw observations and may ... | digging the population of compact binary mergers out of the noise |
inspirals of stellar-mass compact objects into massive black holes, known as extreme mass ratio inspirals (emris), are one of the key targets for upcoming space-based gravitational-wave detectors. in this paper we take the first steps needed to systematically incorporate the effect of external gravitating matter on emr... | extreme mass ratio inspirals into black holes surrounded by matter |
compact boson-star binaries are hypothetical sources for ground-based and space gravitational-wave detectors. their signal would be a messenger for novel fundamental fields and could shed light on the dark matter. in this work, we further develop our analysis [phys. rev. d 102, 083002 (2020), 10.1103/physrevd.102.08300... | bayesian parameter estimation on boson-star binary signals with a coherent inspiral template and spin-dependent quadrupolar corrections |
gravitational wave astrophysics relies heavily on the use of matched filtering both to detect signals in noisy data from detectors and to perform parameter estimation and tests of general relativity on those signals. matched filtering relies upon prior knowledge of the signals expected to be produced by a range of astr... | precessing numerical relativity waveform surrogate model for binary black holes: a gaussian process regression approach |
the millihertz gravitational wave band is expected to be opened by space-borne detectors like tianqin. various mechanisms can produce short outbursts of gravitational waves, whose actual waveform can be hard to model. in order to identify such gravitational wave bursts and not to misclassify them as noise transients, w... | searching gravitational-wave bursts with space-borne detectors |
asymmetric emission of gravitational waves during a compact binary coalescence results in the loss of linear momentum and a corresponding `kick' or recoil on the binary's center of mass. this leads to a direction-dependent doppler shift of the ringdown gravitational waveform. we quantify the measurability of the kick i... | testing general relativity via direct measurement of black hole kicks |
we show that if the propagating speed of gravitational waves (gws) gradually diminishes during inflation, the power spectrum of primordial gws will be strongly blue, while that of the primordial scalar perturbation may be unaffected. we also illustrate that such a scenario is actually a disformal dual to the superinfla... | propagating speed of primordial gravitational waves and inflation |
with the improvement in sensitivity of gravitational wave (gw) detectors and the increasing diversity of gw sources, there is a strong need for accurate gw waveform models for data analysis. while the current model accuracy assessments require waveforms generated by numerical relativity (nr) simulations as the "true wa... | assessing the model waveform accuracy of gravitational waves |
a compact stellar-mass object inspiraling onto a massive black hole deviates from geodesic motion due to radiation-reaction forces as well as finite-size effects. such postgeodesic deviations need to be included with sufficient precision into wave-form models for the upcoming space-based gravitational-wave detector lis... | hamilton-jacobi equation for spinning particles near black holes |
continuous gravitational wave signals, like those expected by asymmetric spinning neutron stars, are among the most promising targets for ligo and virgo detectors. the development of fast and robust data analysis methods is crucial to increase the chances of a detection. we have developed a new and flexible general dat... | a new data analysis framework for the search of continuous gravitational wave signals |
the cancellation of noise from terrestrial gravity fluctuations, also known as newtonian noise (nn), in gravitational-wave detectors is a formidable challenge. gravity fluctuations result from density perturbations associated with environmental fields, e.g., seismic and acoustic fields, which are characterized by compl... | machine learning for gravitational-wave detection: surrogate wiener filtering for the prediction and optimized cancellation of newtonian noise at virgo |
compact binaries are an important class of gravitational-wave (gw) sources that can be detected by current and future gw observatories. they provide a testbed for general relativity (gr) in the highly dynamical strong-field regime. here, we use gws from inspiraling binary neutron stars and binary black holes to investi... | simultaneous bounds on the gravitational dipole radiation and varying gravitational constant from compact binary inspirals |
the local black hole mass function (bhmf) is of great interest to a variety of astrophysical problems, ranging from black hole binary merger rates to an indirect census of the dominant seeding mechanism of supermassive black holes. in this letter, we combine the latest galaxy stellar mass function from the galaxy and m... | exploring the local black hole mass function below 106 solar masses |
the ability to test general relativity in extreme gravity regimes using gravitational wave observations from current ground-based or future space-based detectors motivates the mathematical study of the symmetries of black holes in modified theories of gravity. in this paper we focus on spinning black hole solutions in ... | petrov type, principal null directions, and killing tensors of slowly rotating black holes in quadratic gravity |
the sensitivity of wide-parameter-space searches for continuous gravitational waves is limited by computational cost. recently it was shown that deep neural networks (dnns) can perform all-sky searches directly on (single-detector) strain data [c. dreissigacker et al., phys. rev. d 100, 044009 (2019), 10.1103/physrevd.... | deep-learning continuous gravitational waves: multiple detectors and realistic noise |
coalescing binaries of neutron stars and black holes are one of the most important sources of gravitational waves for the upcoming network of ground-based detectors. detection and extraction of astrophysical information from gravitational-wave signals requires accurate waveform models. the effective-one-body and other ... | accuracy and precision of gravitational-wave models of inspiraling neutron star-black hole binaries with spin: comparison with matter-free numerical relativity in the low-frequency regime |
the gravitational wave memory effect is a prediction of general relativity. the presence of memory effect in gravitational wave signals not only provides the chance to test an important aspect of general relativity, but also represents a potentially non-negligible contribution to the waveform for certain gravitational ... | detecting the gravitational wave memory effect with tianqin |
stellar core collapse events are expected to produce gravitational waves via several mechanisms, most of which are not yet fully understood due to the current limitations in the numerical simulations of these events. in this paper, we begin with an empirical functional form that fits the gravitational-wave spectra from... | systematic study of the stochastic gravitational-wave background due to stellar core collapse |
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