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a polarization modulator unit for a low-frequency telescope in litebird employs an achromatic half-wave plate (ahwp). it consists of five-layer a-cut sapphire plates, which are stacked based on a pancharatnam recipe. in this way, the retardance of the ahwp is a half-wave over the bandwidth of 34 - 161 ghz. the diameter... | mechanical strength and millimeter-wave transmission spectrum of stacked sapphire plates bonded by sodium silicate solution |
anisotropic neutrino emission from a core-collapse supernova (ccsn) causes a permanent change in the local space-time metric, called the gravitational wave (gw) memory. long considered unobservable, this effect will be detectable in the near future, at deci-hertz gw interferometers. i will present a novel idea, where o... | searching for supernova neutrinos with gw memory triggers |
we firstly generalize the massive scalar propagator for planar gravitational waves propagating on minkowski space obtained recently in van haasteren and prokopec (2022 arxiv:2204.12930 [gr-qc]). we then use this propagator to study the response of a freely falling unruh-dewitt detector to a gravitational wave backgroun... | gravitational wave signals in an unruh-dewitt detector |
recent numerical relativity simulations of mergers of binary black holes suggest that the maximum final value of a/m is {∼ }0.95 for the coalescence of two equal-mass black holes with aligned spins of the same magnitude a/m=0.994, which is close to the upper limit a/m=0.998 of accretion spin-up shown by thorne [astroph... | the detection of quasinormal mode with a/m = 0.95 would prove a sphere 99% soaking in the ergoregion of the kerr space-time1 |
a considerable fraction of incident high energy photons from astrophysical transients such as gamma ray bursts (grbs) is compton scattered by the earth's atmosphere. these photons, sometimes referred to as the "reflection component", contribute to the signal detected by space-borne x-ray/γ-ray instruments. the effectiv... | revisiting the earth's atmospheric scattering of x-ray/γ-rays and its effect on space observation: implication for grb spectral analysis |
we report on the monitor of all-sky x-ray image (maxi) observation of the gravitational-wave (gw) event gw170817 and the electromagnetic counterpart of gw170817. gw170817 is a binary neutron star coalescence candidate detected by the advanced laser interferometer gravitational-wave observatory (ligo) and advanced virgo... | maxi upper limits of the electromagnetic counterpart of gw170817 |
it has been suggested by weinberg et al. (2013) that an instability due to the nonlinear coupling of a neutron star's tide to its $p$- and $g$-modes could affect the gravitational-wave phase evolution of a neutron-star binary. weinberg (2016) suggests that this instability can turn on as the gravitational-waves pass th... | constraints on nonlinear tides due to $p$-$g$ mode coupling from the neutron-star merger gw170817 |
quantum-dense metrology constitutes a special case of quantum metrology in which two orthogonal phase space projections of a signal are simultaneously sensed beyond the shot-noise limit. previously, it was shown that the additional sensing channel that is provided by quantum-dense metrology contains information that ca... | reduction of classical measurement noise via quantum-dense metrology |
in this paper, we investigate the sensitivity to additional gravitational wave polarization modes of future detectors. we first look at the upcoming einstein telescope and its combination with existing or planned earth-based detectors in the case of a stochastic gravitational wave background. we then study its correlat... | gravitational wave polarization from combined earth-space detectors |
in this paper, we systematically study gravitational waves (gws) first produced by remote compact astrophysical sources and then propagating in our inhomogeneous universe through cosmic distances, before arriving at detectors. to describe such gws properly, we introduce three scales, λ , lc , and l , denoting, respecti... | gravitational wave cosmology: high frequency approximation |
here we propose a new gravitational waves(gws) detector in broad frequency band, which is operated at exceptional points(eps) in micro cavities. the detected signal is an eigenfrequency split of the mechanical modes caused by the spatial strain. due to the complex square root topology near the ep, the splitting is grea... | gravitational waves detection with exceptional points in micro cavities |
arm locking is a technique for stabilizing the frequency of a laser in an interspacecraft interferometer by using the spacecraft separation as the frequency reference. a candidate technique for future space-based gravitational wave detectors such as the laser interferometer space antenna, arm locking has been extensive... | arm locking with the grace follow-on laser ranging interferometer |
in general relativity, there is no dispersion in gravitational waves, while some modified gravity theories predict dispersion phenomena in the propagation of gravitational waves. in this paper, we demonstrate that this dispersion will induce an observable deviation of waveforms if the orbits have large eccentricities. ... | testing dispersion of gravitational waves from eccentric extreme-mass-ratio inspirals |
with the power to find the best fit to arbitrarily complicated symmetry, machine-learning (ml)-enhanced quantum state tomography (qst) has demonstrated its advantages in extracting complete information about the quantum states. instead of using the reconstruction model in training a truncated density matrix, we develop... | direct parameter estimations from machine learning-enhanced quantum state tomography |
all-sky surveys of x-ray transient objects in the soft x-ray band are essential for observing high-redshift events to probe unexplored physical conditions in the early universe and discovering mysterious electromagnetic counterparts of gravitational-wave sources. hiz-gundam is a future satellite mission that intends to... | performance verification of next-generation si cmos soft x-ray detector for space applications |
in this paper we explore the possibility to search for a dispersion law for light propagation in vacuo with a sample of gamma-ray bursts detected by the theseus satellite. within quantum gravity theories, different models for space-time quantization predict relative discrepancies of the speed of photons w.r.t. the spee... | quantum gravity with theseus |
so far detached compact binaries containing neutron stars have been observed either at intermediate stages of the evolution by radio telescopes or at merger by ground-based gravitational wave detectors. sensitive to gravitational waves from binaries millions to thousands years prior to the merger, the future laser inte... | prospects for studying galactic neutron stars in binaries with lisa |
in this paper, we review the theoretical foundations of gravitational waves in the framework of albert einstein’s theory of general relativity. following einstein’s early efforts, we first derive the linearized einstein field equations and work out the corresponding gravitational wave equation. moreover, we present the... | gravitational waves — a review on the theoretical foundations of gravitational radiation |
we describe the merger-event gamma-ray (mergr) telescope intended for deployment by ~2021. mergr will cover from 20 kev to 2 mev with a wide field of view (6 sr) using nineteen gamma-ray detectors arranged on a section of a sphere. the telescope will work as a standalone system or as part of a network of sensors, to in... | the merger-event gamma-ray (mergr) telescope |
a period of inflation in the early universe produces a nearly scale-invariant spectrum of gravitational waves over a huge range in wavelength. if the amplitude of this gravitational wave background is large enough to be detectable with microwave background polarization measurements, it will also be detectable directly ... | constraining the history of inflation from microwave background polarimetry and laser interferometry |
string cosmology models predict a relic background of gravitational-wave (gw) radiation in the early universe. the gw energy spectrum of radiated power increases rapidly with the frequency, and therefore it becomes a potential and meaningful observation object for high-frequency gw detector. we focus on the stochastic ... | search for stochastic gravitational-wave background from string cosmology with advanced ligo and virgo's o1 o3 data |
decihertz interferometer gravitational wave observatory (decigo) is a future mission for a space-borne laser interferometer. decigo has 1000-km-long arm cavities mainly to detect the primordial gravitational waves (pgws) at lower frequencies around 0.1 hz. observations in the electromagnetic spectrum have lowered the b... | first-step experiment for sensitivity improvement of decigo: sensitivity optimization for simulated quantum noise by completing the square |
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 \emph... | effectual gravitational-wave template banks for coalescing compact binaries using a hybrid placement algorithm |
the advanced ligo and advanced virgo detectors have commenced observations. gravitational waves from the merger of binary black hole systems and a binary neutron star system have been observed. a major goal for ligo and virgo is to detect or set limits on a stochastic background of gravitational waves. a stochastic bac... | implications of the binary coalescence events found in o1 and o2 for the stochastic background of gravitational events |
the gravitational waves emitted from a binary neutron star merger, as predicted from general relativistic magneto-hydrodynamics calculations, are sensitive to the appearance of quark matter and the stiffness of the equation of state of qcd matter present in the inner cores of the stars. this is a new messenger observab... | matter and gravitation in collisions of heavy ions and neutron stars: equation of state |
hermes-pathfinder is a constellation of six 3u nano-satellites hosting simple but innovative x-ray detectors for determining the positions of, and monitoring cosmic high-energy transients such as gamma-ray bursts and the electromagnetic counterparts of gravitational wave events. the hermes technological pathfinder proj... | hermes-pathfinder |
second generation gravitational wave detectors are likely to be limited by newtonian noise at low frequencies. a dual torsion pendulum sensor aimed at exploring low- frequency gravitational-force noise is being studied at the anu. this sensor is designed to measure local gravitational forces to high precision and will ... | torpedo: a low frequency gravitational force sensor |
using the wentzel-kramers-brillouin method, we show that the peak location (r_peak) of the potential, which determines the quasinormal mode frequency of the kerr black hole, obeys an accurate empirical relation as a function of the specific angular momentum a and the gravitational mass m. if the quasinormal mode with a... | how close can we approach the event horizon of the kerr black hole from the detection of gravitational quasinormal modes? |
the possible burst occurred in location and temporal consistence with gravitational wave event gw150914, as reported by fermi gbm, offers a new way of constraining models with extra dimensions. using the time delay in arrival of the gamma ray transient observed by fermi gamma-ray burst monitor (gmb) relative to the gra... | size of shell universe in light of fermi gbm transient associated with gw150914 |
due to improvements in the sensitivity of gravitational wave (gw) detectors, the detection of gws originating from the fundamental quasi-normal mode (f-mode) of neutron stars has become possible. the future detection of gws originating from the f-mode of neutron stars will provide a potential way to improve our underst... | constraint on nuclear symmetry energy imposed by f-mode oscillation of neutron stars |
the european space agency (esa) selected the gravitational universe as the science theme for l3, a large space mission with a planned launch in 2034. nasa expressed a strong interest in joining esa as a junior partner. the goal of the mission is the detection of gravitational waves of frequencies between 0.1 mhz and 0.... | heterodyne laser frequency stabilization for long baseline optical interferometry in space-based gravitational wave detectors |
in this paper we discuss the development of a fast and accurate waveform model for the quasi-circular orbital evolution of extreme-mass-ratio-inspirals (emris). this model simply employs the data of a few numerical teukoulsky-based energy fluxes and waveforms to fit out a set of polynomials for the entire fluxes and wa... | fast evolution and waveform generator for extreme-mass-ratio inspirals in equatorial-circular orbits |
lisa is a proposed space-based laser interferometer detecting gravitational waves by measuring distances between free-floating test masses housed in three satellites in a triangular constellation with laser links in-between. each satellite contains two optical benches that are articulated by moving optical subassemblie... | towards the lisa backlink: experiment design for comparing optical phase reference distribution systems |
in the braneworld scenario the zero-mode gravitons are trapped on a brane due to non-linear warping effect, so that gravitational waves can reflect from the brane walls. if the reflected waves form an interference pattern on the brane, then it can be detected on existing detectors due to spatial variations of intensity... | diffractions from the brane and gw150914 |
random projection (rp) is a powerful dimension reduction technique widely used in analysis of high dimensional data. we demonstrate how this technique can be used to improve the computational efficiency of gravitational wave searches from compact binaries of neutron stars or black holes. improvements in low-frequency r... | random projections in gravitational wave searches of compact binaries |
the masses of neutron stars in neutron star binaries are observed to fall in a narrow mass range around ∼1.33 m⊙. we explore the advantage of focusing on this region of the parameter space in gravitational-wave searches. we find that an all-sky (externally triggered) search with an optimally reduced template bank is ex... | beyond the horizon distance: ligo-virgo can boost gravitational-wave detection rates by exploiting the mass distribution of neutron stars |
the response of a test particle, both for the free case and under the harmonic oscillator potential, to circularly polarized gravitational waves is investigated in a noncommutative quantum mechanical setting. the system is quantized following the prescription in saha and gangopadhyay (phys lett b 681:96, 2009). an alge... | noncommutative quantum mechanics of simple matter systems interacting with circularly polarized gravitational waves |
long predicted more than 50 years ago, strong evidence for the existence of crystalline cores inside white dwarfs has recently been obtained by the gaia space telescope. it is thus important to investigate how a crystalline core may affect the properties and dynamics of white dwarfs. in this paper, we first study the d... | oscillations and tidal deformations of crystallized white dwarfs |
a crucial challenge to the ongoing endeavor of spaceborne gravitational wave (gw) detection resides in the laser phase noise, typically 7 to 8 orders of magnitude above the inevitable noise. the arm-locking technique was proposed to suppress the noise in prestabilized laser beams. based on the feedback control theory, ... | arm locking in conjunction with time-delay interferometry |
quantum sensors exploiting matter waves interferometry promise to realize a new generation of gravitational wave detectors. the intrinsic stability of specific atomic energy levels makes atom interferometers and clocks ideal candidates to extend the frequency window for the observation of gravitational waves in the mid... | quantum sensors with matter waves for gw observation |
for future space-based gravitational wave detectors, drag-free control is one of the core technologies to achieve ambitious ultra-quiet-stable requirements. generally, the high performance of such a drag-free satellite is severely limited by the intrinsic nonlinearities, various noise and limited bandwidth. to overcome... | robust composite control design of drag-free satellite with kalman filter-based extended state observer for disturbance reduction |
the black hole perturbation toolkit models gravitational radiation from small mass-ratio binaries as well as from the ringdown of black holes. the former are key sources for the future space-based gravitational wave detector lisa. bhptoolkit brings together core elements of multiple scattered black hole perturbation th... | bhptoolkit: black hole perturbation toolkit |
an analysis of modern developments in the area of space-based gravitational-wave detectors is presented, and possible applications of key technologies for future space-based measurements of the gradient of the earth's gravitational field are considered. the structure of a space-based gradiometer based on free masses is... | space-based gravitational-wave detectors: development of ground-breaking technologies for future space-based gravitational gradiometers |
we discuss possible implications of the recent detection by the ligo and virgo collaboration of the gravitational-wave event gw170817, the signal of which is consistent with predictions in general relativity on the merging of neutron stars. a near-simultaneous and spatially correlated observation of a gamma-ray burst, ... | testing merging of dark exotic stars from gravitational waves in the multi-messenger approach |
the counter jet of a short gamma-ray burst (sgrb) has not yet been observed, while recent discoveries of gravitational waves (gws) from a binary neutron star merger gw170817 and the associated sgrb 170817a have demonstrated that off-axis sgrb jets are detectable. we calculate the prompt emission from the counter jet of... | prompt emission from the counter jet of a short gamma-ray burst |
we propose a cross-correlation method for the searches of ultra-light fields, in particular, with a space network of atomic sensors. the main motivation of the approach is cancellation of uncorrelated noises in the observation data and unique pattern the fields leave on the cross-spectrum, depending on their nature (i.... | searching for stochastic background of ultra-light fields with atomic sensors |
current and future astroparticle physics experiments are operated or are being built to observe highly energetic particles, high energy electromagnetic radiation and gravitational waves originating from all kinds of cosmic sources. the data volumes taken by the experiments are large and expected to grow significantly d... | towards a model for computing in european astroparticle physics |
gamma-ray bursts (grbs) are flashes of γ -rays thought to originate from rare forms of massive star collapse (long grbs) or from mergers of compact binaries (short grbs) containing at least one neutron star (ns). the nature of the postexplosion/postmerger remnant [ns versus black hole (bh)] remains highly debated. in ∼... | multiwaveform cross-correlation search method for intermediate-duration gravitational waves from gamma-ray bursts |
gravitational lensing caused by the gravitational field of massive objects has been studied and acknowledged for a long period of time. in this paper, however, we propose a different mechanism where the bending of light stems from the non-linear interaction of gravitational, electromagnetic and axion waves that creates... | gravitational lensing in rotating and twisting universes |
gravitational wave observations from merging compact objects are becoming commonplace, and as detectors improve and gravitational wave sources become more varied, it is increasingly important to have dense and expansive template banks of predicted gravitational waveforms. since numerical relativity is the only way to f... | optimizing the placement of numerical relativity simulations using a mismatch predicting neural network |
the matter-wave laser interferometric gravitation antenna (miga) is an underground instrument using cold-atom interferometry to perform precision measurements of gravity gradients and strains. following its installation at the low noise underground laboratory lsbb in the south-east of france, it will serve as a prototy... | cold-atom sources for the matter-wave laser interferometric gravitation antenna (miga) |
a feasible design for a magnetic diagnostics subsystem for elisa will be based on that of its precursor mission, lisa pathfinder. previous experience indicates that magnetic field estimation at the positions of the test masses has certain complications. this is due to two reasons. the first is that magnetometers usuall... | interpolation of the magnetic field at the test masses in elisa |
the existence of the ergoregion of the kerr space-time has not yet been confirmed observationally. we show that the confirmation would be possible by observing the quasinormal mode in gravitational waves. as an example, using the recent population synthesis results of population iii (pop iii) binary black holes, we fin... | possible confirmation of the existence of the ergoregion by the kerr quasinormal mode in gravitational waves from a population iii massive black hole binary |
we analyze the trajectories of three geostationary satellites forming the geostationary gravitational wave interferometer (geograwi) [1], a space-based laser interferometer mission aiming to detect and study gravitational radiation in the (10-4-10) hz band. the combined effects of the gravity fields of the earth, the s... | orbit analysis of a geostationary gravitational wave interferometer detector array |
we investigate the impact of resonant gravitational waves on quadrupole acoustic modes of sun-like stars located nearby stellar black hole binary systems (such as gw150914 and gw151226). we find that the stimulation of the low-overtone modes by gravitational radiation can lead to sizeable photometric amplitude variatio... | gravitational waves from stellar black hole binaries and the impact on nearby sun-like stars |
please see the pdf file for details. | erratum: synergy between ground and space based gravitational wave detectors. part ii: localisation erratum: synergy between ground and space based gravitational wave detectors. part ii: localisation |
gravitational waves from coalescing black-hole binaries (bhbs) were recently observed by the advanced ligo detectors. based on the perturbation analysis, for general kaluza-klein theories with compact extra dimensions, we find a 1st-order post-newtonian correction to the inspiral gravitational waveforms of black-hole b... | measuring the dimensionality of compact extra dimensions with inspiral gravitational waves from black-hole binaries |
context. binary systems of supermassive black holes are expected to be strong sources of long gravitational waves prior to merging. these systems are good candidates to be observed with forthcoming space-borne detectors. only a few of these systems, however, have been firmly identified to date.aims: we aim at providing... | high-energy signatures of binary systems of supermassive black holes |
scorpius x-1 (sco x-1) has long been considered one of the most promising targets for detecting continuous gravitational waves with ground-based detectors. observational searches for sco x-1 have achieved substantial sensitivity improvements in recent years, to the point of starting to rule out emission at the torque-b... | implementation of a new weave-based search pipeline for continuous gravitational waves from known binary systems |
the main goal of lisa pathfinder (lpf) mission is to estimate the acceleration noise models of the overall lisa technology package (ltp) experiment on-board. this will be of crucial importance for the future space-based gravitational-wave (gw) detectors, like elisa. here, we present the bayesian analysis framework to p... | bayesian statistics for the calibration of the lisa pathfinder experiment |
high performance particle detectors are needed for fundamental research in high energy physics in the exploration of the higgs boson, dark matter, anti-matter, gravitational waves and proof of the standard model, which will extend the understanding of our universe. future particle detectors should have ultrahigh radiat... | core-shell diodes for particle detectors |
despite world-wide ground, underground, and space based observations in search of anticipated electromagnetic and perhaps neutrino counterparts to the 29 compact binary merger events, which have been detected by the upgraded ligo-virgo gravitational wave detectors in the first half year of their observation period o3, ... | on the missing counterparts of ligo-virgo binary merger events |
thermoelastic distortion resulting from optical absorption by transmissive and reflective optics can cause unacceptable changes in optical systems that employ high-power beams. in advanced-generation laser-interferometric gravitational wave detectors, for example, optical absorption is expected to result in wavefront d... | modeling thermoelastic distortion of optics using elastodynamic reciprocity |
future space-borne gravitational wave detectors will require a precise definition of calibration signals to ensure the achievement of their design sensitivity. the careful design of the test signals plays a key role in the correct understanding and characterization of these instruments. in that sense, methods achieving... | optimal design of calibration signals in space-borne gravitational wave detectors |
lisa pathfinder is the technological demonstrator space mission for the future gravitational waves observatory in space elisa, with the aim of measure the differential acceleration between free-falling test masses orbiting in the same apparatus at a level of 30 fm/s-2hz-1/2 at 1 mhz. because the satellite can't follow ... | a torsion pendulum ground test of the lisa pathfinder free-fall mode |
the principal subject of this thesis is the gravitational two-body problem in the extreme-mass-ratio regime---that is, where one mass is significantly smaller than the other---in the full context of our contemporary theory of gravity, general relativity. we divide this work into two broad parts: the first provides an o... | study of the relativistic dynamics of extreme-mass-ratio inspirals |
the mission concept theseus (transient high energy sky and early universe surveyor) aims at exploiting gamma-ray bursts (grb) to explore the early universe, as well as becoming a cornerstone of multi-messenger and time-domain astrophysics. to achieve these goals, a key feature is the capability to survey the soft x-ray... | breakthrough multi-messenger astrophysics with the theseus space mission |
compressible, riemann s-type ellipsoids can emit gravitational waves (gws) with a chirp-like behavior (hereafter chirping ellipsoids, cels). we show that the gw frequency-amplitude evolution of cels (mass ~ 1 m⊙, radius ~ 103 km, polytropic equation of state with index n ≈ 3) is indistinguishable from that emitted by d... | chirping compact stars: gravitational radiation and detection degeneracy with binaries |
albert einstein's general theory of relativity, published in 1915, made a remarkable prediction: gravitational radiation. just like light (electromagnetic radiation), gravity could travel through space as a wave and affect any objects it encounters by alternately compressing and expanding them. however, there was a pro... | neutron stars, black holes and gravitational waves |
in this dissertation we discuss gravitational waves (gws) and their neutron star (ns) sources. we begin with a general discussion of the motivation for searching for gws and the indirect experimental evidence of their existence. then we discuss the various mechanisms through which ns can emit gws, paying special attent... | searching for gravitational waves from neutron stars |
this work describes a method used to calculate the amount of stray light able to couple to the detectors and create disturbing interference on the measurements in an arbitrarily complex optical system. the method is able to take into account the physical properties (diffraction) of the propagating beams and to translat... | effective cross sections for stray light calculations in laser interferometry: application to lisa science interferometer |
thermal diagnostics experiments to be carried out on board lisa pathfinder (lpf) will yield a detailed characterisation of how temperature fluctuations affect the ltp (lisa technology package) instrument performance, a crucial information for future space based gravitational wave detectors as the proposed elisa. amongs... | in-flight thermal experiments for lisa pathfinder: simulating temperature noise at the inertial sensors |
galactic white dwarf binaries will be an abundant source of gravitational waves in the mhz frequency band of space-based detectors such as elisa. a few thousand to a few tens of thousands of these systems will be individually resolvable by elisa, depending on the final detector configuration. the remaining tens of mill... | white dwarf binaries and the gravitational wave foreground |
the national space science center in beijing has announced the development of two space-based missions, including a fully fledged gravitational-wave detector, as ling xin reports | china targets gravitational-wave missions |
the recent detections of gravitational waves (gw) by the ligo and virgo collaborations opened a new era in the fields of physics and astrophysics. the possibility to explore the universe with a new type of messenger paves the way for the observations of a novel class of phenomena otherwise not detectable in the electro... | detecting gravitational waves with atomic sensors |
we describe a setup based on michelson interferometry for coherent measurements of the backscattered light from a low roughness optical surface under test. special data processing was developed for the extraction of the useful signal from the various stray contributions to the coherent signal. we achieve coherent detec... | study of the coherent perturbation of a michelson interferometer due to the return from a scattering surface |
we present a tabletop six-axis vibration isolation system, compatible with ultra-high vacuum (uhv), which is actively damped and provides 25 db of isolation at 10 hz and 65 db at 100 hz. while this isolation platform has been primarily designed to support optics in the laser interferometer gravitational-wave observator... | a compact actively damped vibration isolation platform for optical experiments in ultra-high vacuum |
the laser interferometer space antenna is a foreseen gravitational wave detector, which aims to detect 10-20 strains in the frequency range from 0.1 mhz to 0.1 hz. it is a triangular constellation, with equal sides of m, of three spacecraft, where heterodyne interferometry measures the spacecraft distances. the stray l... | the lisa interferometer: impact of stray light on the phase of the heterodyne signal |
lisa pathfinder (lpf) is an in-flight technological demonstrator designed and launched to prove the feasibility of sub-femto-g free fall of kilo-sized test masses (tm), an essential ingredient for the future gravitational wave observatory from space. half a year after launch, the first results are available and show an... | lisa pathfinder first results |
knowledge of the intensity and phase profiles of spectral components in a coherent optical field is critical for a wide range of high-precision optical applications. one of these is interferometric gravitational wave detectors, which rely on such fields for precise control of the experiment. here we demonstrate a new d... | an optical lock-in camera for advanced gravitational wave interferometers |
the advanced virgo (adv) detector is composed of different degrees of freedom (dofs) i.e. michelson interferometer, two fabry-perot arm cavities, signal recycling cavity, and power recycling cavity. these dofs need to be locked to precise accuracy with robust, fast and reliable control systems. the control signals used... | auxiliary lasers for advanced virgo gravitational wave detector using single pass second harmonic generation in periodically poled lithium niobate crystal |
parametric instability is an intrinsic problem in high power laser interferometer gravitational wave detectors. optical cavity modes interact with acoustic modes of the test masses, leading to laser power dependent exponential growth of acoustic vibration of the test masses. future detectors are being planned with desi... | designing arm cavities free of parametric instability for gravitational wave detectors |
one strategy for reducing the online computational cost of matched-filter searches for gravitational waves is to introduce a compressed basis for the waveform template bank in a grid-based search. in this paper, we propose and investigate several tunable compression schemes for a general template bank. through offline ... | tunable compression of template banks for fast gravitational-wave detection and localization |
michelson type gravitational wave detectors measure the strain caused by gravitational waves on the interferometer's arms. gravitational waves can also cause the rotation of photon's linear polarization vector, thus disturbing the interference of entangled photons in hong-ou-mandel (hom) interferometers. here one uses ... | hong-ou-mandel gravitational wave space spectrometer - homer mission |
the laser interferometer space antenna (lisa) mission is a space-based gravitational wave detector consisting of three spacecraft with two transceiver telescopes per spacecraft. in addition to tight wavefront error control as expected for an interferometric system, there are tight pupil imaging and optical path length ... | pupil aberrations in the lisa transceiver design |
laser interferometer gravitational wave detectors such as advanced ligo use large fused silica test masses in which temperature perturbations take many hours to reach dynamic equilibrium. when environmental disturbances cause the optical cavities to lose optical power there is a sudden thermal transient which causes th... | preventing transient parametric instabilities in high power gravitational wave detectors using thermal transient compensation |
since the direct detection of gravitational wave will give us a fruitful insight about the early universe or life of stars, laser interferometric gravitational wave detectors with the strain sensitivity of higher than 10-22 have been developed. in japan, the space gravitational wave detector project named deci-hertz gr... | space gravitational wave antenna decigo and b-decigo |
the taiji-1 satellite is a pioneering space technology mission designed by the chinese academy of science (cas) to test key technologies required for gravitational wave detection in space. temperature stability is a critical element because it can couple with the gravitational wave measurement. a dedicated thermal cont... | temperature stability of the taiji-1 satellite in operational orbit |
independent mode frequency control will improve the ability to suppress parametric instabilities in gravitational wave detectors. in this article we investigate a formalism that allows multiple cavity optical modes to be thermally tuned independently based on the transformation between the change in mode spacing and th... | contoured thermal deformation of mirror surface for detuning parametric instability in an optical cavity |
laser interferometer space antenna (lisa) pathfinder is a mission to test the technology enabling gravitational wave detection in space and to demonstrate that sub-femto-g free fall levels are possible. to do so, the distance between two free falling test masses is measured to unprecedented sensitivity by means of lase... | non-linear quantization error reduction for the temperature measurement subsystem on-board lisa pathfinder |
superconducting reentrant cavities may be used in parametric transducers for resonant-mass gravitational wave detectors. when coupled to a spherical resonant antenna, transducers will monitor its mechanical quadrupolar modes, working as a mass-spring system. in this paper we will investigate the effect of the niobium n... | study of the effect of nbn on microwave niobium cavities for gravitational wave detectors |
thermal lensing in resonant optical interferometers such as those used for gravitational wave detection is a concern due to the negative impact on control signals and instrument sensitivity. in this paper we describe a method for monitoring the thermal state of such interferometers by probing the higher-order spatial m... | in situ characterization of the thermal state of resonant optical interferometers via tracking of their higher-order mode resonances |
the high energy rapid modular ensemble of satellites (hermes) technological and scientific pathfinder is a space borne mission based on a constellation of leo nanosatellites. the payloads of these cubesats consist of miniaturized detectors designed for bright high-energy transients such as gamma-ray bursts (grbs). this... | the payload data handling unit (pdhu) on-board the hermes-tp and hermes-sp cubesat missions |
we discuss the gravitational wave (gw) emission and the orbital evolution of a hierarchical triple system composed of an inner binary black hole (bbh) and an outer tertiary. depending on the kick velocity at the merger, the merged bbh could tidally disrupt the tertiary. even though the fraction of bbh mergers accompani... | forecasting tidal disruption events for binary black holes with an outer tertiary |
iss-tao is a mission selected for a concept study by nasa, and proposed by gsfc for launch to the international space station (iss) in order to observe transient high-energy astrophysical sources. it is composed of an x-ray wide-field imager (wfi), and a multi-directional gamma-ray transient monitor (gtm). wfi will be ... | the gamma-ray transient monitor for iss-tao: new directional capabilities |
several experimental detections have demonstrated the existence of borromean states predicted by vitaly efimov within a nuclear physics context, that is, trimers bound despite the absence of bound states of any of the two-body subsystems. i show that novel efimov physics is expected in gravitationally polarizable nonba... | efimov physics in curved spacetime: field fluctuations and exotic matter |
gravity is the most familiar force at our natural length scale. however, it is still exotic from the view point of particle physics. the first experimental study of quantum effects under gravity was performed using a cold neutron beam in 1975. following this, an investigation of gravitationally bound quantum states usi... | precision measurement of the position-space wave functions of gravitationally bound ultracold neutrons |
we report on the results of a study conducted from nov 2012-apr 2013 to develop a telescope design for a space-based gravitational wave detector. the telescope is needed for efficient power delivery but since it is directly in the beam path, the design is driven by the requirements for the overall displacement sensitiv... | optical telescope design study results |
the space-based gravitational wave detector lisa (laser interferometer space antenna) requires a high performance position sensor in order to measure the translation and tilt of the free flying test mass with respect to the lisa optical bench. here, we present a mechanically highly stable and compact setup of a heterod... | a heterodyne interferometer for high resolution translation and tilt measurement as optical readout for the lisa inertial sensor |
the present lisa (laser interferometer space antenna) gravitational wave detector concept features three satellites in individual earth trailing helio-centric orbits, which are linked by bi-directional monostatic laser interferometry between free-falling inertial reference masses inside the payload. the spacecrafts are... | novel payload architectures for lisa |
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