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we develop new strategies to build numerical relativity surrogate models for eccentric binary black hole systems, which are expected to play an increasingly important role in current and future gravitational-wave detectors. we introduce a new surrogate waveform model, nrsur2dq1ecc, using 47 nonspinning, equal-mass wave... | eccentric binary black hole surrogate models for the gravitational waveform and remnant properties: comparable mass, nonspinning case |
gravitational waves (gws) in the mhz-ghz frequency range are motivated by a host of early universe phenomena such as oscillons, preheating, and cosmic strings. we point out that baryogenesis too serves as a motivation to probe gws in this frequency range. the connection is through primordial black holes (pbhs): on the ... | baryogenesis, primordial black holes and mhz-ghz gravitational waves |
gravitational vacuum condensate stars, proposed as the endpoint of gravitational collapse consistent with quantum theory, are reviewed. gravastars are cold, low entropy, maximally compact objects characterized by a surface boundary layer and physical surface tension instead of an event horizon. within this thin boundar... | gravitational vacuum condensate stars |
it is widely believed that electroweak baryogenesis should be suppressed in strong phase transitions with fast-moving bubble walls, but this effect has never been quantitatively studied. we rederive fluid equations describing transport of particle asymmetries near the bubble wall without making the small-wall-velocity ... | electroweak baryogenesis at high bubble wall velocities |
on 2019 august 14, the advanced ligo and virgo interferometers detected the high-significance gravitational wave (gw) signal s190814bv. the gw data indicated that the event resulted from a neutron star-black hole (nsbh) merger, or potentially a low-mass binary bh merger. due to the low false-alarm rate and the precise ... | growth on s190814bv: deep synoptic limits on the optical/near-infrared counterpart to a neutron star-black hole merger |
until recently, high-resolution global modeling of tides has been done separately from high-resolution global modeling of the atmospherically-forced oceanic general circulation. here we review the emerging class of high-resolution global models that are simultaneously forced by both atmospheric fields and the astronomi... | incorporating tides and internal gravity waves within global ocean general circulation models: a review |
the detailed observation of the distribution of redshifts and chirp masses of binary black hole (bh) mergers is expected to provide a clue to their origin. in this paper, we develop a hybrid model of the probability distribution function of gravitational lensing magnification taking account of both strong and weak grav... | effect of gravitational lensing on the distribution of gravitational waves from distant binary black hole mergers |
the heaviest neutron stars and lightest black holes expected to be produced by stellar evolution leave the mass range 2.2 m ${}_{\odot }\lesssim m\lesssim 5$ ${m}_{\odot }$ largely unpopulated. objects found in this so-called lower mass gap likely originate from a distinct astrophysical process. such an object, with ma... | black hole formation in the lower mass gap through mergers and accretion in agn disks |
we consider an extension of the standard model with a complex singlet scalar, where a global u(1) symmetry is explicitly broken to &z;3 symmetry. we study the two-step electroweak phase transition in the model and find that it can be of first-order if the heavy scalar mass falls in the range of 1-2 tev and the mixing a... | first-order electroweak phase transition in a complex singlet model with &z;3 symmetry |
we investigate the different polarization modes of gravitational waves (gws) in $f(r)$ gravity power law model in de sitter space. it is seen that the massive scalar field polarization mode exists in this model. the mass of the scalar field depends highly on the background curvature and the power term $n$. however, we ... | gravitational waves in \\mathbf {f(r)} gravity power law model |
the two interferometric ligo gravitational-wave observatories provide the most sensitive data to date to study the gravitational-wave universe. as part of a global network, they have completed their third observing run in which they observed many tens of signals from merging compact binary systems. it has long been kno... | parameterised population models of transient non-gaussian noise in the ligo gravitational-wave detectors |
the detection of the least damped quasinormal mode from the remnant of the gravitational wave event gw150914 realized the long-sought possibility of observationally studying the properties of quasistationary black hole spacetimes through gravitational waves. past literature has extensively explored this possibility, an... | observational black hole spectroscopy: a time-domain multimode analysis of gw150914 |
maxwell's equations are invariant under both duality rotations and conformal transformations. recently bandos, lechner, sorokin, and townsend have found a nonlinear generalisation of electrodynamics which possesses both of these symmetries. we couple this theory to general relativity and explore self-gravitating config... | black holes and gravitational waves sourced by non-linear duality rotation-invariant conformal electromagnetic matter |
we present a novel calculation of the four-momentum that is radiated into gravitational waves during the scattering of two arbitrarily spinning bodies. our result, which is accurate to leading order in g , to quadratic order in the spins, and to all orders in the velocity, is derived by using a routhian-based worldline... | gravitational bremsstrahlung from spinning binaries in the post-minkowskian expansion |
what can we learn about the density dependence of nuclear symmetry energy {e}_{mathrm{sym}}(rho ) e sym ( ρ ) from precise measurements of the radius (r1.4) and/or tidal polarizability (λ1.4) of canonical neutron stars with a mass of 1.4 {{m}}_{⊙ } m ⊙ ? with the {e}_{mathrm{sym}}(rho ) e sym ( ρ ) parameterized using ... | delineating effects of nuclear symmetry energy on the radii and tidal polarizabilities of neutron stars |
the current gravitational-wave (gw) localization methods rely mainly on sources with electromagnetic counterparts. unfortunately, a binary black hole does not emit light. due to this, it is generally not possible to localize these objects precisely. however, strongly lensed gravitational waves, which are forecasted in ... | localizing merging black holes with sub-arcsecond precision using gravitational-wave lensing |
within a recently proposed classically conformal model, in which the generation of neutrino masses is linked to spontaneous scale symmetry breaking, we investigate the associated phase transition and find it to be of strong first order with a substantial amount of supercooling. carefully taking into account the vacuum ... | gravitational waves from first-order phase transitions: ligo as a window to unexplored seesaw scales |
a compact object was observed with a mass of $2.50\mbox{--}2.67\,{m}_{\odot }$ by ligo scientific and virgo collaborations (lvc) in gw190814, which provides a great challenge to investigations of supranuclear matter. to study this object, the properties of the neutron star are systematically calculated within the lates... | the possibility of the secondary object in gw190814 as a neutron star |
the first gravitational wave (gw) — gamma-ray burst (grb) association, gw170817/grb 170817a, had an offset in time, with the grb trigger time delayed by ∼1.7 s with respect to the merger time of the gw signal. we generally discuss the astrophysical origin of the delay time, δ t, of gw-grb associations within the contex... | the delay time of gravitational wave — gamma-ray burst associations |
in this work, we estimate how much bulk viscosity driven by urca processes is likely to affect the gravitational wave signal of a neutron star coalescence. in the late inspiral, we show that bulk viscosity affects the binding energy at fourth post-newtonian order. even though this effect is enhanced by the square of th... | projecting the likely importance of weak-interaction-driven bulk viscosity in neutron star mergers |
we use the gravitational wave signals from binary black hole merger events observed by ligo and virgo to reconstruct the underlying mass and spin distributions of the population of merging black holes. we reconstruct the population using the mixture model framework vamana using observations in gwtc-2 occurring during t... | the emergence of structure in the binary black hole mass distribution |
the laser interferometer space antenna (lisa) mission, scheduled for launch in the early 2030s, is a gravitational wave observatory in space designed to detect sources emitting in the millihertz band. in contrast to the present ground-based detectors, the lisa data are expected to be a signal dominated, with strong and... | characterization of the stochastic signal originating from compact binary populations as measured by lisa |
the electromagnetic (em) signal of a binary neutron star (bns) merger depends sensitively on the total binary mass, m tot, relative to various threshold masses set by the neutron star (ns) equation of state (eos), parameterized through the neutron star (ns) maximum mass, m tov, and characteristic radius, r 1.6. em obse... | the multi-messenger matrix: the future of neutron star merger constraints on the nuclear equation of state |
the future space mission lisa will observe a wealth of gravitational-wave sources at millihertz frequencies. of these, the extreme-mass-ratio inspirals of compact objects into massive black holes are the only sources that combine the challenges of strong-field complexity with that of long-lived signals. such signals ar... | rapid generation of fully relativistic extreme-mass-ratio-inspiral waveform templates for lisa data analysis |
we analyze the results of the gravity wave (gw)-resolving, high-resolution kühlungsborn mechanistic general circulation model in july at mcmurdo station (166.69°e and 77.84°s), where strong downslope eastward winds create strong mountain wave (mw) events. these mws have horizontal wavelengths of λh≃230 km, propagate to... | numerical modeling of the excitation, propagation, and dissipation of primary and secondary gravity waves during wintertime at mcmurdo station in the antarctic |
modeling the interaction of dust with long-wave (lw) radiation is still a challenge because of the scarcity of information on the complex refractive index of dust from different source regions. in particular, little is known about the variability of the refractive index as a function of the dust mineralogical compositi... | global scale variability of the mineral dust long-wave refractive index: a new dataset of in situ measurements for climate modeling and remote sensing |
this study explores the impact of antisymmetric tensor effects on spherically symmetric black holes, investigating photon spheres, shadows, emission rate and quasinormal frequencies in relation to a parameter which triggers the lorentz symmetry breaking. we examine these configurations without and with the presence of ... | exploring antisymmetric tensor effects on black hole shadows and quasinormal frequencies |
we present bubbleprofiler, a c++ software package for finding field profiles in bubble walls and calculating the bounce action during phase transitions involving multiple scalar fields. our code uses a recently proposed perturbative method for potentials with multiple fields and a shooting method for single field cases... | bubbleprofiler: finding the field profile and action for cosmological phase transitions |
using photometry collected with the zwicky transient facility, we are conducting an ongoing survey for binary systems with short orbital periods ( ${p}_{{\rm{b}}}\lt 1\,\mathrm{hr})$ with the goal of identifying new gravitational-wave sources detectable by the upcoming laser interferometer space antenna (lisa). we pres... | a systematic search of zwicky transient facility data for ultracompact binary lisa-detectable gravitational-wave sources |
the dark sirens method enables us to use gravitational wave events without electromagnetic counterparts as tools for cosmology and tests of gravity. furthermore, the dark sirens analysis code gwcosmo can now robustly account for information coming from both galaxy catalogues and the compact object mass distribution. we... | testing the nature of gravitational wave propagation using dark sirens and galaxy catalogues |
gravitational wave (gw) predictions of cosmological phase transitions are almost invariably evaluated at either the nucleation or percolation temperature. we investigate the effect of the transition temperature choice on gw predictions, for phase transitions with weak, intermediate and strong supercooling. we find that... | how robust are gravitational wave predictions from cosmological phase transitions? |
the bumblebee gravity model, with a vector field nonminimally coupled to gravity, is a natural extension of the einstein-maxwell theory. in this theory, a black hole can carry a vector hair, making the metric deviate from the schwarzschild metric. to investigate the detectability of the vector hair, we consider an extr... | probing vector hair of black holes with extreme-mass-ratio inspirals |
neutron star mergers are among the most promising sources of gravitational waves for advanced ground-based detectors. these mergers are also expected to power bright electromagnetic signals, in the form of short gamma-ray bursts, infrared/optical transients powered by r-process nucleosynthesis in neutron-rich material ... | low mass binary neutron star mergers: gravitational waves and neutrino emission |
relativistic ultracompact objects without an event horizon may be able to form in nature and merge as binary systems, mimicking the coalescence of ordinary black holes. the postmerger phase of such processes presents characteristic signatures, which appear as repeated pulses within the emitted gravitational waveform, i... | parameter estimation of gravitational wave echoes from exotic compact objects |
black hole-neutron star (bh-ns) mergers are among the most promising gravitational-wave sources for ground-based detectors, and gravitational waves from bh-ns mergers are expected to be detected in the next few years. the simultaneous detection of electromagnetic counterparts with gravitational waves would provide rich... | models of kilonova/macronova emission from black hole-neutron star mergers |
relativistic causality constrains the $s$-matrix both through its analyticity, and by imposing lower bounds on the scattering time delay. these bounds are easiest to determine for spacetimes which admit either a timelike or null killing vector. we revisit a class of pp-wave spacetimes and carefully determine the scatte... | surfin' pp-waves with good vibrations: causality in the presence of stacked shockwaves |
merging black holes (bh) are expected to produce remnants with large dimensionless spin parameters ($a_{\rm spin} \sim 0.7$). however, gravitational wave (gw) observations with ligo/virgo suggest that merging bh are consistent with modestly positive but not high spin ($a_{\rm spin} \sim 0.2$), causing tension with mode... | constraining the ligo/virgo agn channel with black hole spins |
as a new member to the gecam mission, the gecam-c is a gamma-ray all-sky monitor onboard satech-01 satellite. gecam-c was launched on july 27th, 2022 and it is also called hebs (high energy burst searcher). gecam-c is designed to detect gamma-ray transients from 6 kev to 6 mev, such as gamma-ray bursts (grbs), high ene... | the performance of sipm-based gamma-ray detector (grd) of gecam-c |
when the universe is treated as a quantum system, it is described by a wave function. this wave function is a function not only of the matter fields, but also of spacetime. the no-boundary proposal is the idea that the wave function should be calculated by summing over geometries that have no boundary to the past, and ... | review of the no-boundary wave function |
numerical relativity waveforms are a critical resource in the quest to deepen our understanding of the dynamics of, and gravitational waves emitted from, merging binary systems. we present 181 new numerical relativity simulations as the second maya catalog of binary black hole waveforms (a sequel to the georgia tech wa... | second maya catalog of binary black hole numerical relativity waveforms |
we investigate cosmological phase transitions in various composite higgs models consisting of four-dimensional asymptotically-free gauge field theories. each model may lead to a confinement-deconfinement transition and a phase transition associated with the spontaneous breaking of a global symmetry that realizes the st... | cosmological phase transitions in composite higgs models |
fast radio bursts (frbs) are bright millisecond-duration radio bursts at cosmological distances. while young magnetars are the leading source candidate, recent observations suggest that there may be multiple frb progenitor classes. here we investigate a potential coincidence between a binary neutron star merger event, ... | an assessment of the association between a fast radio burst and binary neutron star merger |
roughly half of the quasiperiodic eruption (qpe) sources in galactic nuclei exhibit a remarkably regular alternating "long-short" pattern of recurrence times between consecutive flares. we show that a main-sequence star (brought into the nucleus as an extreme mass-ratio inspiral; emri) that passes twice per orbit throu... | emri + tde = qpe: periodic x-ray flares from star-disk collisions in galactic nuclei |
the 2.5-generation (2.5g) ground-based gravitational wave (gw) detectors ligo voyager and neutron star extreme matter observatory (nemo) are expected to be operational in the late 2020s and early 2030s. in this work, we explore the potential of gw standard sirens observed by the 2.5g gw detectors in measuring cosmologi... | standard siren cosmology in the era of the 2.5-generation ground-based gravitational wave detectors: bright and dark sirens of ligo voyager and nemo |
spin angular momentum associated with circular polarization is a fundamental and important aspect of photons both in classical and quantum optics. the interaction of this optical spin with matter and structures results in many intriguing optical effects and state-of-the-art applications covered under the emerging subje... | spin photonics: from transverse spin to photonic skyrmions |
we demonstrate that chromo-natural inflation can be made consistent with observational data if the su(2) gauge symmetry is spontaneously broken. working in the stueckelberg limit, we show that isocurvature is negligible, and the resulting adiabatic fluctuations can match current observational constraints. observable le... | higgsed chromo-natural inflation |
the data analysis of the gravitational wave signals emitted by coalescing neutron star binaries requires the availability of an accurate analytical representation of the dynamics and waveforms of these systems. we propose an effective-one-body model that describes the general relativistic dynamics of neutron star binar... | modeling the dynamics of tidally interacting binary neutron stars up to the merger |
it is expected that gravitational waves, similar to electromagnetic waves, can be gravitationally lensed by intervening matters, producing multiple instances of the same signal arriving at different times from different apparent luminosity distances with different phase shifts compared to the un-lensed signal due to le... | bayesian statistical framework for identifying strongly lensed gravitational-wave signals |
we present new (3 +1 )d numerical relativity simulations of the binary neutron star (bns) merger and postmerger phase. we focus on a previously inaccessible region of the binary parameter space spanning the binary's mass ratio q ∼1.00 - 1.75 for different total masses and equations of state, and up to q ∼2 for a stiff ... | gravitational waves and mass ejecta from binary neutron star mergers: effect of the mass ratio |
we produce the first numerical relativity binary black hole gravitational waveforms in a higher-curvature theory beyond general relativity. in particular, we study head-on collisions of binary black holes in order-reduced dynamical chern-simons gravity. this is a precursor to producing beyond-general-relativity wavefor... | numerical binary black hole collisions in dynamical chern-simons gravity |
the initial mass function (imf), binary fraction, and distributions of binary parameters (mass ratios, separations, and eccentricities) are indispensable inputs for simulations of stellar populations. it is often claimed that these are poorly constrained, significantly affecting evolutionary predictions. recently, dedi... | merger rates of double neutron stars and stellar origin black holes: the impact of initial conditions on binary evolution predictions |
beyond individually resolvable gravitational wave events such as binary black hole and binary neutron star mergers, the superposition of many more weak signals coming from a multitude of sources is expected to contribute to an overall background, the so-called stochastic gravitational wave background. in this review, w... | stochastic gravitational wave background: methods and implications |
ultralight bosonic fields are compelling dark-matter candidates and arise in a variety of beyond standard model scenarios. these fields can tap energy and angular momentum from spinning black holes through superradiant instabilities, during which a macroscopic bosonic condensate develops around the black hole. striking... | black hole superradiant instability from ultralight spin-2 fields |
we present the spectroscopic evolution of at 2017gfo, the optical counterpart of the first binary neutron star (bns) merger detected by ligo and virgo, gw170817. while models have long predicted that a bns merger could produce a kilonova (kn), we have not been able to definitively test these models until now. from one ... | the rapid reddening and featureless optical spectra of the optical counterpart of gw170817, at 2017gfo, during the first four days |
binary black holes (bbhs) are thought to form in different environments, including the galactic field and (globular, nuclear, young, and open) star clusters. here, we propose a method to estimate the fingerprints of the main bbh formation channels associated with these different environments. we show that the metallici... | fingerprints of binary black hole formation channels encoded in the mass and spin of merger remnants |
we introduce the first complete nonparametric model for the astrophysical distribution of the binary black hole (bbh) population. constructed from basis splines, we use these models to conduct the most comprehensive data-driven investigation of the bbh population to date, simultaneously fitting nonparametric models for... | cover your basis: comprehensive data-driven characterization of the binary black hole population |
taiji is a chinese space mission to detect gravitational waves in the frequency band 0.1 mhz to 1.0 hz, which aims at detecting super (intermediate) mass black hole mergers and extreme (intermediate) mass ratio in-spirals. a brief introduction of its mission overview, scientific objectives, and payload design is presen... | the taiji program: a concise overview |
the canonical view of the maritime continent (mc) diurnal cycle is deep convection occurring over land during the afternoon and evening, tending to propagate offshore overnight. however, there is considerable day-to-day variability in the convection, and the mechanism of the offshore propagation is not well understood.... | a local-to-large scale view of maritime continent rainfall: control by enso, mjo, and equatorial waves |
the interaction between light and mesoscopic mechanical degrees of freedom has been investigated under various perspectives, from spectroscopy in condensed matter, optical tweezer particle trapping, and long-haul optical fiber communication system penalties to gravitational-wave detector noise. in the context of integr... | brillouin optomechanics in nanophotonic structures |
ultralight bosons can form large clouds around stellar-mass black holes via the superradiance instability. through processes such as annihilation, these bosons can source continuous gravitational-wave signals with frequencies within the range of ligo and virgo. if boson annihilation occurs, then the galactic black hole... | characterizing the continuous gravitational-wave signal from boson clouds around galactic isolated black holes |
the short gamma-ray burst (grb) 170817a was the first grb associated with a gravitational-wave event. due to the exceptionally low luminosity of the prompt γ-ray and the afterglow emission, the origin of both radiation components is highly debated. the most discussed models for the burst and the afterglow include a reg... | low-frequency view of gw170817/grb 170817a with the giant metrewave radio telescope |
we present detailed observations of the shock waves emitted at the collapse of single cavitation bubbles using simultaneous time-resolved shadowgraphy and hydrophone pressure measurements. the geometry of the bubbles is systematically varied from spherical to very nonspherical by decreasing their distance to a free or ... | shock waves from nonspherical cavitation bubbles |
a model for the acoustic production of gravitational waves at a first-order phase transition is presented. the source of gravitational radiation is the sound waves generated by the explosive growth of bubbles of the stable phase. the model assumes that the sound waves are linear and that their power spectrum is determi... | sound shell model for acoustic gravitational wave production at a first-order phase transition in the early universe |
we re-analyse the laser interferometer gravitational-wave observatory (ligo)-virgo strain data of the 10 binary black hole mergers reported to date and compute the likelihood function in terms of chirp mass, mass ratio, and effective spin. we discuss the strong degeneracy between mass ratio and spin for the three light... | constraints on binary black hole populations from ligo-virgo detections |
the identification of the electromagnetic (em) counterpart candidate ztf19abanrhr to the binary black hole merger gw190521 opens the possibility to infer cosmological parameters from this standard siren with a uniquely identified host galaxy. the distant merger allows for cosmological inference beyond the hubble consta... | a standard siren cosmological measurement from the potential gw190521 electromagnetic counterpart ztf19abanrhr |
recent gravitational wave observations allow us to probe gravity in the strong and dynamical field regime. in this paper, we focus on testing einstein-dilation gauss-bonnet gravity which is motivated by string theory. in particular, we use two new neutron star black hole binaries (gw200105 and gw200115). we also consid... | constraints on einstein-dilation-gauss-bonnet gravity from black hole-neutron star gravitational wave events |
galactic ultracompact binaries are expected to be the dominant source of gravitational waves in the milli-hertz frequency band. of the tens of millions of galactic binaries with periods shorter than an hour, it is estimated that a few tens of thousand will be resolved by the future laser interferometer space antenna (l... | global analysis of the gravitational wave signal from galactic binaries |
the current work attempts to apply an accurate and numerical strategy to obtain analytical and approximation soliton solutions to a significant version of the fifth-order kdv equation (fkdv): the caudrey-dodd-gibbon (cdg) equation. this model describes the propagation of gravity-capillary waves, shallow water waves wit... | in surface tension; gravity-capillary, magneto-acoustic, and shallow water waves' propagation |
as the sensitivity of current and future gravitational-wave detectors improves, it will become possible to measure the evolution of the binary black hole merger rate with redshift. here, we combine detailed fits to state-of-the-art dynamical models of binary black hole formation in dense star clusters with a cosmologic... | redshift evolution of the black hole merger rate from globular clusters |
many cosmological models rely on large couplings of axions to gauge fields. examples include theories of magnetogenesis, inflation on a steep potential, chiral gravitational waves, and chromonatural inflation. such theories require a mismatch between the axion field range and the mass scale appearing in the af\tilde{f}... | clockwork axions in cosmology. is chromonatural inflation chrononatural? |
linear perturbations of spherically symmetric spacetimes in general relativity are described by radial wave equations, with potentials that depend on the spin of the perturbing field. in previous work [phys. rev. d 99, 104077 (2019), 10.1103/physrevd.99.104077] we studied the quasinormal mode spectrum of spacetimes for... | parametrized black hole quasinormal ringdown. ii. coupled equations and quadratic corrections for nonrotating black holes |
we apply the average null energy condition to obtain upper bounds on the three-point function coefficients of stress tensors and a scalar operator, < ttoi>, in general cfts. we also constrain the gravitational anomaly of u(1) currents in four-dimensional cfts, which are encoded in three-point functions of the for... | bounds on ope coefficients from interference effects in the conformal collider |
the promise by the ligo/virgo/kagra (lvk) collaboration to detect black-hole-neutron-star (bh-ns) mergers via gravitational wave (gw) emission has recently been fulfilled with the detection of gw200105 and gw200115. mergers of bh-ns binaries are particularly exciting for their multimessenger potential since gw detectio... | black-hole-neutron-star mergers are unlikely multimessenger sources |
bose-einstein condensate dark matter (becdm, also known as fuzzy dark matter) is motivated by fundamental physics and has recently received significant attention as a serious alternative to the established cold dark matter (cdm) model. we perform cosmological simulations of becdm gravitationally coupled to baryons and ... | galaxy formation with becdm - ii. cosmic filaments and first galaxies |
validating the black hole no-hair theorem with gravitational-wave observations of compact binary coalescences provides a compelling argument that the remnant object is indeed a black hole as described by the general theory of relativity. this requires performing a spectroscopic analysis of the postmerger signal and res... | ringdown overtones, black hole spectroscopy, and no-hair theorem tests |
this article provides the details on the technical derivation of the gravitational waveform and total gravitational-wave energy flux of nonspinning compact binary systems to the fourth post-newtonian (4pn) order beyond the einstein quadrupole formula. in particular: (i) we overview the link between the radiative multip... | gravitational-wave flux and quadrupole modes from quasicircular nonspinning compact binaries to the fourth post-newtonian order |
in spite of the vast literature on the subject of first order electroweak phase transitions (ewpts), which can provide the necessary conditions for generating the baryon asymmetry in the universe, fermion-induced ewpts still remain a rather uncharted territory. in this paper, we consider a simple fermionic extension of... | multistep strongly first order phase transitions from new fermions at the tev scale |
we derive causality constraints on the simplest scalar-tensor theories in which black holes differ from what general relativity predicts, a scalar coupled to the gauss-bonnet or the chern-simons terms. demanding that time advances are unobservable within the regime of validity of these effective field theories, we find... | causality constraints on black holes beyond gr |
light bosons, proposed as a possible solution to various problems in fundamental physics and cosmology1-3, include a broad class of candidates for physics beyond the standard model, such as dilatons and moduli4, wave dark matter5 and axion-like particles6. if light bosons exist in nature, they will spontaneously form `... | probing the existence of ultralight bosons with a single gravitational-wave measurement |
we analytically calculate the scalar induced gravitational waves (sigws) and find a log-dependent slope of sigw in the infrared regions (f <fc), namely ngw(f )=3 -2 /ln (fc/f ), and ngw(f )=2 -2 /ln (fc/f ) near the peak if the power spectrum of scalar curvature perturbation is quite narrow, where fc is roughly the ... | log-dependent slope of scalar induced gravitational waves in the infrared regions |
using the recently derived higher-spin gravitational compton amplitude from low-energy analytically continued (a /g m ≫1 ) solutions of the teukolsky equation for the scattering of a gravitational wave off the kerr black hole, observables for nonradiating super-extremal kerr binary systems at second post-minkowskian (p... | dynamics for super-extremal kerr binary systems at o (g2) |
we calculate the tree-level amplitudes for electrically neutral 2 → 2 scattering for the standard model higgs doublet non-minimally coupled to the ricci scalar. we consider both the metric and the palatini formulation of gravity. we find the partial wave unitarity limit for a general background field value. our results... | tree-level unitarity in higgs inflation in the metric and the palatini formulation |
the issue of the gauge invariance of gravitational waves arises if they are produced in the early universe at second-order in perturbation theory. we address it by dividing the discussion in three parts: the production of gravitational waves, their propagation in the real universe, and their measurement. | on the gauge invariance of cosmological gravitational waves |
while the advanced ligo and virgo gravitational-wave (gw) experiments now regularly observe binary black hole (bbh) mergers, the evolutionary origin of these events remains a mystery. analysis of the bbh spin distribution may shed light on this mystery, offering a means of discriminating between different binary format... | the low effective spin of binary black holes and implications for individual gravitational-wave events |
we report the results of optical follow-up observations of 29 gravitational-wave (gw) triggers during the first half of the ligo-virgo collaboration (lvc) o3 run with the gravitational-wave optical transient observer (goto) in its prototype 4-telescope configuration (goto-4). while no viable electromagnetic (em) counte... | searching for electromagnetic counterparts to gravitational-wave merger events with the prototype gravitational-wave optical transient observer (goto-4) |
we analyse in some detail a highly tractable non-singular modification of the kerr geometry, dubbed the "eye of the storm" - a rotating regular black hole with an asymptotically minkowski core. this is achieved by "exponentially suppressing" the mass parameter in the kerr spacetime: m → m e-ℓ/r . the single suppression... | the eye of the storm: a regular kerr black hole |
we present an improved version of the 3d monte carlo radiative transfer code possis to model kilonovae from neutron star mergers, wherein nuclear heating rates, thermalization efficiencies, and wavelength-dependent opacities depend on local properties of the ejecta and time. using an axially symmetric two-component eje... | the critical role of nuclear heating rates, thermalization efficiencies, and opacities for kilonova modelling and parameter inference |
gravitational wave detection requires a detailed understanding of the response of the ligo and virgo detectors to true signals in the presence of environmental and instrumental noise. of particular interest is the study of anomalous non-gaussian transients, such as glitches, since their occurrence rate in ligo and virg... | classification and unsupervised clustering of ligo data with deep transfer learning |
the space gravitational wave (gw) antennae is more sensitive to the lower frequency gw signals compare with the ground-based gw detectors. the space mission taiji is designed to detect the gw sources within frequencies between 0.1 mhz and 1 hz. a preliminary study of taiji was started in 2008. up to now, a sophisticate... | a brief analysis to taiji: science and technology |
the combined observation of gw170817 and its electromagnetic counterpart grb170817a reveals that gravitational waves propagate at the speed of light in high precision. we apply the standard analysis of cosmological perturbations, as well as the effective field theory approach, to investigate the experimental consequenc... | f (t ) gravity after gw170817 and grb170817a |
the submesoscale energy budget is complex and remains understood only in region-by-region analyses. based on a series of nested numerical simulations, this study investigated the submesoscale energy budget and flux in the upper ocean of the kuroshio extension, including some innovations for examining submesoscale energ... | submesoscale eddies in the upper ocean of the kuroshio extension from high-resolution simulation: energy budget |
the ligo and virgo gravitational-wave detectors have uncovered binary black hole systems with definitively nonzero spins, as well as systems with significant spin residing in the more massive black hole of the pair. we investigate the ability of isolated binary evolution in forming such highly spinning, asymmetric-mass... | suspicious siblings: the distribution of mass and spin across component black holes in isolated binary evolution |
because of its speed after training, machine learning is often envisaged as a solution to a manifold of the issues faced in gravitational-wave astronomy. demonstrations have been given for various applications in gravitational-wave data analysis. in this letter, we focus on a challenging problem faced by third-generati... | normalizing flows as an avenue to studying overlapping gravitational wave signals |
it is well known that tsunamis can produce gravity waves that propagate up to the ionosphere generating disturbed electron densities in the e and f regions. these ionospheric disturbances can be studied in detail using ionospheric total electron content (tec) measurements collected by continuously operating ground-base... | real-time detection of tsunami ionospheric disturbances with a stand-alone gnss receiver: a preliminary feasibility demonstration |
the mergers of neutron stars expel a heavy-element enriched fireball that can be observed as a kilonova1-4. the kilonova's geometry is a key diagnostic of the merger and is dictated by the properties of ultra-dense matter and the energetics of the collapse to a black hole. current hydrodynamical merger models typically... | spherical symmetry in the kilonova at2017gfo/gw170817 |
extreme mass ratio inspirals (emris) are important sources for space-borne gravitational wave detectors, such as the laser interferometer space antenna and tianqin. previous emri rate studies have focused on the "loss cone" scenario, where stellar-mass black holes (sbhs) are scattered into highly eccentric orbits near ... | formation rate of extreme mass ratio inspirals in active galactic nuclei |
we derive the classical gravitational radiation from an aligned spin binary black hole on closed orbits, using a dictionary built from the 5-point qft scattering amplitude of two massive particles exchanging and emitting a graviton. we show explicitly the agreement of the transverse-traceless components of the radiativ... | post-newtonian waveforms from spinning scattering amplitudes |
the finite physical source problem is usually studied with the concept of volume and time integrals over green's functions (gfs), representing delta-impulse solutions to the governing partial differential field equations. in seismology, the use of realistic earth models requires the calculation of numerical or syntheti... | a python framework for efficient use of pre-computed green's functions in seismological and other physical forward and inverse source problems |
in this work we shall study a possible pre-inflationary scenario for our universe and how this might be realized by f (r) gravity. specifically, we shall introduce a scenario in which the universe in the pre-inflationary era contracts until it reaches a minimum magnitude, and subsequently expands, slowly entering a slo... | pre-inflationary bounce effects on primordial gravitational waves of f(r) gravity |
this note discusses the relation between our knowledge of gravity waves and the parameterization of their effects in global models. improving these parameterizations represents a major motivation for current research on atmospheric gravity waves. indeed, as a major portion of the gravity wave spectrum is on the subgrid... | how does knowledge of atmospheric gravity waves guide their parameterizations? |
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