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polarlight is a dedicated soft x-ray polarimeter onboard a cubesat, which was launched into a sun-synchronous orbit on october 29, 2018. in march, 2019, polarlight started full operation. since then, regular observations with the crab, sco x-1, and background regions have been conducted. here i will report the operatio... | first year operation and results of polarlight - a cubesat soft x-ray polarimeter |
reconnection is known to play a major role in particle acceleration in both solar and astrophysical regimes, yet little is known about its connection with the global scales and its comparative contribution in the generation of seps with respect to other acceleration mechanisms, such as the shock at a fast cme front, in... | 3d reconnection and sep considerations in the cme-flare problem |
for 45 years, the solar x-ray sensors (xrs) on the goes weather satellites have been making real-time measurements of the disk-integrated solar x-ray irradiance. these data have been remarkably consistent and contiguous and are the backbone of modern solar flare classification. when goes 8 was launched in 1994, it obse... | solar x-ray irradiance observations from the noaa goes spacecraft: accuracy vs continuity |
the off-plane grating rocket experiment (ogre) is a sounding rocket mission which aims to raise the technology readiness levels of three new technologies for soft x-ray astronomy, as well as produce the highest resolution spectrum of capella yet. this paper focusses on the focal plane camera of the telescope which empl... | the focal plane camera for the off-plane grating rocket experiment |
the well-established notion of a "common population" of the accelerated electrons simultaneously producing the hard x-ray (hxr) and the microwave (mw) emission during the flare impulsive phase has been challenged by some studies reporting the discrepancies between the hxr-inferred and the mw-inferred electron energy sp... | three-dimensional forward-fit modeling of the hard x-ray and the microwave emissions of the 2015-06-22 m6.5 flare |
the beatrix (beam expander testing x-ray) facility is now operative at the inaf-osservatorio astronomico brera (merate, italy). this facility has been specifically designed and built for the x-ray acceptance tests (psf and effective area) of the athena silicon pore optics (spo) mirror modules (mm). the unique setup cre... | x-ray tests of the athena mirror modules in beatrix: from design to reality |
we present the results of the low-mass x-ray binary 4u 1636-536 study. we performed a temporal analysis of all available rxte/all-sky monitor, rxte/proportional counter array, swift/burst alert telescope, and maxi data collected until the middle of 2022. within our analysis we confirmed the previously discovered quasip... | long-term quasiperiodicity in lmxb 4u 1636-536 |
a laue lens is an innovative approach to focus x and gamma ray in the energy range from ~60 kev to 600 kev through laue diffraction by a properly arranged array of crystals. good candidates as optical elements for such lenses are selfstanding bent crystals, in which the permanent curvature is obtained by a controlled s... | self standing curved crystals for gamma ray focusing |
currently, with the continuous enrichment of astronomical observation means (ligo/virgo for gw, parkes, arecibo and green bank telescope for frb, icecube for neutrino observatory, etc…), multi-messenger observation has become one of the hot spots in current astronomical research. x /γ ray observation is one of the impo... | mission pointing optimisation of twin satellite system for all-sky burst monitoring |
tunneling is an inherently quantum mechanical process. interactions between particles can speed the single-particle tunneling dynamics up or slow it down; they can also trigger correlated tunneling of pairs or clusters. we use high performance computing to implement a trapezoidal splitting method that allows us to solv... | tunneling dynamics of small two-component fermi system |
the nature and complexity of various kinds of astronomical data visualizations can be challenging to communicate with people who are blind or low vision. in consultation with members from blind and low vision communities, we present an overview of 3d print, sonification and visual description projects at nasa's chandra... | chandra's accessible universe: from sight to sound & touch |
the university of the virgin islands (uvi) recently won a proposal "the first four-year physics and astronomy degree at the university of the virgin islands; a new era in caribbean participation in nasa science" in collaboration with nasa goddard space flight center (gsfc). the proposal included building a detector lif... | developing a new test stand for lifetime measurements using a narrow gap detector |
the optical properties of x-ray mirror samples are commonly measured using diffractometers based on laboratory sources; like the bede d1 diffractometer operating at inaf-oab. this instrument can generate a collimated x-ray beam up to 60 kev, even though the most interesting energy region for x-ray astronomy application... | upgrade of a laboratory x-ray diffractometer to extend its operating range towards soft energies |
while the identification of a worthy topic or challenge is fundamental to the goal of conducting cutting-edge research, another ingredient is indispensable in the field of observational astronomy: the best possible target. indeed, the ability to choose from a significant number of extremely powerful gravitational lense... | which way to the next frontier? finding the most powerful cluster lenses |
skyrmions are one of the most complex magnetic orders observed and consist of a localized excitation constructed from a vortex-like, continuous rotation of magnetic spins, representing a topological quasi- particle. also, skyrmions are interesting candidates for future information technologies due to their topological ... | theoretical modeling of the formation of skyrmions in fe-gd |
advanced ligo began observing in september 2015 with over 3 times the distance reach (27 times the sensitive volume) of its previous configuration. some gravitational-wave sources, particularly neutron star binary mergers, are expected to produce broadband electromagnetic transients which may be crucial to understandin... | broadband electromagnetic follow-up of advanced ligo sources |
the project goal is to demonstrate that thin walled (<400 micron thick) x-ray optics can be controllably shaped to produce high quality (~1" or better) x-ray optics at an affordable price. since the desired surface area for the next generation x-ray telescope is >10x that of chandra, the >10x requirement is th... | correcting and coating thin walled x-ray optics via a combination of controlled film deposition and magnetic smart materials |
the enhanced x-ray timing and polarimetry (extp) mission is a large innovative observatory in the field of x-ray astronomy, designed to study the properties of matter under extreme conditions of density, gravity, and magnetic fields. it is developed by an international consortium led by the institute of high energy phy... | the digital data processing concepts of the large area detector and the wide field monitor onboard extp |
this textbook follows the «extragalactic astronomy. book 1. galaxies: basic physical properties». book 2 describes methods and instrumental means for obtaining and processing data on physical properties of galaxies in various spectral ranges. attention is paid to galaxies with excess radiation in the ir, radio, uv, and... | extragalactic astronomy. book 2. galaxies: multiwavelength properties |
the focusing optics x-ray solar imager (foxsi) sounding rocket makes directimaging and spectral observation of the sun in hard x-rays (hxrs) using highlysensitive focusing hxr optics. the second flight of foxsi was launchedsuccessfully on 11 december 2014 and observed significant hxr emissions duringmicroflares. some o... | combined sdo/aia, hinode/xrt and foxsi-2 microflare observations - dem analysis and energetics |
much of our knowledge of physical conditions in the solar chromosphere, transition region, and corona, such as temperature, electron density, element abundances, mass motions and turbulent motions, depends on analysis of high resolution x-ray-euv spectroscopic data. the analysis of spectroscopic data depends in turn on... | an x-ray-euv spectroscopic view of the solar atmosphere |
recent observations from the swap euv imager on-board proba2 and sxi x-ray observations from the goes satellite have shown that post-flare giant arches and regular post-flare loops are one and the same thing. however, it is still not clear how certain loop systems are able to sustain prolonged growth to heights greater... | post-flare giant arches - unanswered questions |
icecube detects high energy neutrinos in the 100 gev to pev range at the geographic south pole. a crucial tool in searching for sources of astrophysical neutrinos is multimessenger astronomy. i will cover how icecube uses gamma-ray, x-ray, optical, uhecr, and gravity wave data in different analyses. an important compon... | multimessenger astronomy with icecube |
we present low frequency observations of the grand design spiral galaxy, m83, using the c and l bands of the karl g. jansky very large array (vla). with recent optical (hst) and x-ray (chandra) observations and utilizing the newly expanded bandwidth of the vla, we are exploring the radio spectral properties of the hist... | taking the radio blinders off of m83: a wide spectrum analysis of the historical point source population |
typical solar flares display two quasi-parallel, bright ribbons on the chromosphere. in between is the polarity inversion line separating concentrated magnetic fluxes of opposite polarities in active regions (ars). intriguingly a series of flares exhibiting x-shaped ribbons occur at the similar location on the outskirt... | what produce energetic flares with x-shaped ribbons on the outskirts of solar active region? |
the fermi γ-ray space telescope (fermi) has surveyed the entire sky at the highest-energy band of the electromagnetic spectrum. the majority of fermi sources have counterpart identifications from multi-wavelength large-area surveys, particularly in the radio and x-ray bands. however, around 35% of fermi sources remain ... | unveiling unidentified fermi sources |
the recently upgraded jvla has enabled a breakthrough in radio astronomy by providing a radio telescope with unprecedented sensitivity, resolution, and imaging capabilities. we present new jvla observations of clusters of galaxies, including state-of-the-art low-frequency 230-470 mhz observations of the perseus cluster... | high-dynamic range jvla observations of clusters of galaxies |
current cherenkov telescopes for vhe gamma ray astrophysics are pointing instruments with a field of view up to a few tens of sq.deg. we propose to build an array of two non-steerable telescopes with a fov of 5 x 60 sq.deg oriented along the meridian. roughly half of the sky drifts through this fov in a year. we have p... | machete: a transit imaging atmospheric cherenkov telescope to survey half of the vhe gamma ray sky |
apollo 15 (and 16) did not only bring people to the moon, but also experiments to study our neighbour and its environment. onboard the command and service modules (csm's) were x-ray experiments, to explore the lunar surface chemistry. these data, covering about 10% of the lunar surface has been extensively used to stud... | cygnus x-1\'s "fast" x-ray variability behaviour in the 70s revisited: never throw away old data! |
in 1979, while the voyager spacecraft were undertaking their paradigm-shifting explorations of the jovian system, the earth-orbiting einstein x-ray observatory was taking the first x-ray images of the planet (metzger+ 1983). through the 1990s, rosat further evolved our understanding of jupiter's x-rays, revealing emiss... | x-raying jupiters extremes a review of 42 years of jovian x-rays |
the advanced x-ray imaging satellite (axis) is a large effective area, high-resolution x-ray facility that will be proposed to the upcoming nasa probe call. the combination of exceptional sensitivity and exquisite imaging enable a broad range of time-domain and multi-messenger science opportunities in the coming decade... | time-domain and multi-messenger science with the axis mission |
we have developed a wolter optic to image warm (>15 kev) x-ray sources on the z machine, the first-ever instrument of its kind specifically designed and fabricated for hed applications. adapted from observational astronomy for z, the optic uses curved x-ray mirrors to form an energy band-limited 2d image of a source... | high-resolution imaging of warm x-ray sources with a wolter optic on the z machine |
after 20 years of mission the xmm-newton space observatory has already successfully completed more than 14.000 pointing observations. those observations are performed by 3 x-ray telescopes and 1 optical/uv telescope, all of them yielding simultaneous astronomical data over 6 different instruments: 3 x-ray cameras (euro... | the xmm-newton pipeline. 20 years of mission processed in 5.5 days |
with the launch of jwst, and the upcoming launch of xrism, nasa will be expanding its coverage of the electromagnetic spectum with superb spectrographs from the x-ray to the mid infrared. spectra will be recorded in unprecedented detail, spectra that contain a wealth of information about the emitting sources. the astro... | meeting the challenge of high-precision spectroscopy: laboratory-grade atomic models for astrophysics |
measuring the impulsive and prolonged acceleration of charged particles, electrons and ions, to high energies is an important step in understanding the physics of solar energetic eruptions. the spectrum and composition of energetic ions interacting at the flare site can be obtained by measuring their secondary neutral ... | next-generation scintillators for solar flare gamma-ray and neutron measurements |
supermassive black holes preserve information on the growth of the host galaxy and its dynamical evolution. for example, the growth mechanism of black holes involves the radiative accretion efficiency and thus its spin. active galactic nuclei (agn) emit a wide range of x-ray radiation produced by the closest accreting ... | overview of the recent results from x-ray spectroscopy in agn |
we explore the formation and evolution of binary star systems containing black holes, neutron stars, and white dwarfs in globular clusters (gc). we use northwestern's cluster monte carlo code, cmc, to build a set of 137 fully-evolved gc models that, overall, effectively match the properties of the observed gcs in the m... | dynamical formation of compact object binaries in globular clusters |
a large, coordinated monitoring campaign on mrk 142 took place from 2018 october-2019 june. the core of the campaign was centered around x-ray and uv/optical observations taken with swift. in addition, we obtained further x-ray observations with nicer, as well as supporting ground-based photometric and spectroscopic mo... | vizier online data catalog: seambhs. xi. mrk 142 x-ray to optical light curves (cackett+, 2020) |
asymptotic giant branch (agb) stars are a major contributor of dust to the interstellar medium (ism). the species of dust created by agb stars depends on their ratio of carbon to oxygen (c/o); for this case we are studying oxygen-rich stars where the c/o<1. the minerals we are primarily focused on in this study are ... | using tem/xrd for classification of transition alumina for astronomical applications |
master global robotic net (master-net:http://observ.pereplet.ru lipunov et al.,2010, advances in astronomy,2010,30l) observed grb 210402a (swift trigger 1040123 page et al. gcn 29743, evans et al. gcn 29750, laha et al. 29761, ttrigger=2021-04-02t22:03:17.22, also fermi trigger #639093861 t_trigger(fermi) = 22 04 17 ro... | grb 210402a: master prompt and follow up optical observation |
we report of the discovery of x-ray emission possibly associated with the gaia-discovered supernova 2017egm (delgado et al, tns astronomical transient report no 11679), which has been recently been identified as a hydrogen-poor super-luminous supernova (slsn-i, dong et al., atel #10498). | possible discovery of x-ray emission from supernova 2017egm with swift |
the focusing optics x-ray solar imager (foxsi) sounding rocket payload is scheduled to fly a third time on august 22, 2018 as part of the low-cost access to space (lcas) program of nasa. foxsi is the first solar dedicated telescope that utilizes direct focusing optics, together with high-sensitivity semiconductor detec... | the third flight of the foxsi rocket: performance and results |
the history of astronomy is as ancient as the reach of our written records. all the human civilizations have been interested in the study and interpretation of the night sky and its objects and phenomena. these observations were performed with the naked eye until the beginning of the 17th century, when galileo galilei ... | very-high-energy gamma-ray observations of pulsar wind nebulae and cataclysmic variable stars with magic and development of trigger systems for iacts |
accretion, governed by gravity, is a fundamental source of energy in the universe. accretion is important to the growth and evolution of black holes, as well as the structure in the universe on larger scales. accretion disks around supermassive black holes are likely to have produced most of the ionizing radiation in t... | probing the inner accretion flow properties around black holes with x-ray observations |
we present an automatic peak-finding method based on the wavelet transform and convolutional neural network to identify the peaks of light curves, and it helps to rapidly discover potential transient sources from massive data. here we use the real observation data of the hxmt as our experiment data. the experiments mak... | an automatic search method for x-ray astronomical outburst events based on wavelet transform and convolutional neural network |
soxs (son of x-shooter) will be a spectrograph for the eso ntt telescope capable to cover the optical and nir bands. soxs will be built and run by an international consortium, carrying out rapid and longer term target of opportunity requests on a variety of astronomical objects. soxs will observe all kind of transient ... | the soxs instrument and its significance in the future of la silla |
this is the code used to produce the results for the paper: "measuring the soft excess region size relative to the corona in agn with nicer" published in the astrophysical journal | code for article: "measuring the soft excess region size relative to the corona in agn with nicer" |
the gravitational-wave optical transient observer (goto, steeghs et al. 2022) performed a targeted observation in response to grb 231110a (d'elia et al., gcn 34977) at 22:26:08 ut on 2023-11-10, 66.5 minutes after trigger. the observation consisted of a 4x90s exposure in the goto l-band (400-700 nm). images were proces... | grb 231110a: goto optical upper limits |
we investigate the onset of ~20 random x-ray jets observed by hinode/xrt. each jetwas near the limb in a polar coronal hole, and showed a ''bright point'' in anedge of the base of the jet, as is typical for previously-observed x-ray jets. weexamined sdo/aia euv images of each of the jets over multiple aia channels,incl... | revised view of solar x-ray jets |
the heating mechanisms responsible for the million degree solar corona remain one of the most intriguing problems in space science. it is widely agreed, that the ubiquitous presence o f reconnection events and the associated impulsive heating (nanoflares) are a strong candidate in solving this problem [klimchuk j.a., 2... | signatures of type iii solar radio bursts from nanoflares: final results |
we report a detailed examination of the variance formation of m9.3 solar flare associated with solar radio burst type v that occurred on 2011 august 4. solar radio burst type v was identified occurred with present of coronal mass ejection (cme) towards earth which moving estimated about 1,950 km/s which can gives major... | the variance formation of m9.3 solar flare associated with solar radio burst type v occurred at eight (8) different sites of the callisto system on 4th august 2011 |
we present the energy spectra of cosmic ay nuclei and electrons in the local interstellar medium (lism) from the cosmic ray subsystem on voyager 1 (v1). we use four models of the local interstellar spectra of nuclei and one of electrons that are constrained by the observations to compute the energy density and ionizati... | voyager 1 in the local interstellar medium: cosmic-ray energy density and ionization rate |
guest editorial to introduce the special section on polarimetry in x- and gamma-ray astronomy: the ultimate dimension. | special section guest editorial: polarimetry in x- and gamma-ray astronomy: the ultimate dimension |
the fundamental developmental issue facing the next generation of x-ray astronomical telescopes is the manufacturability, assembly, and structural robustness of the grazing incidence optics. combining the high angular resolution requirements with large effective areas and physical launch vehicle restrictions leads to v... | structural analysis and testing of silicon x-ray mirror modules |
with the development of grazing incidence telescopes, x-ray astronomy has experienced a rapid development in the last decades. effective area plays an important role in telescopes performance. except for increasing the geometric area, improving the reflectivity of coating mirror is a good way to increase effective area... | high reflectance broadband thin films used in x-ray telescopes |
solar transients events such as coronal mass ejections (cmes) and solar flares represent are the cause of various aspects of space weather and can impact the modern man made technological system. such solar transients are often associated with solar radio bursts (srbs), particularly of type ii and iii that , at ground ... | an investigation of solar flares and associated solar radio bursts on ionospheric total electron content |
x-ray quasi-periodic eruptions (qpes) are a new fascinating type of high-energy transient. qpe-emitting sources show high-amplitude bursts of x-ray radiation recurring every few hours in a quasi-periodic fashion. so far only a handful of such sources has been found, originating from the central massive black holes in t... | x-ray quasi-periodic eruptions: a new window to the future of multi-messenger astronomy? |
this thesis explores the properties of galaxies that reside in regions of high density and the influence of the environment in their evolution. n particular, it aims to shed more light on the understanding of how galaxies stop forming stars, becoming passive objects, and the role played by environment in this process. ... | the influence of environment on the star formation properties of galaxies |
this thesis focuses on the study of pulsar wind nebulae (pwne), which form as a result of the bulk of the pulsar rotational energy begin lost via the emission of a relativistic wind of particles. the winds, being supersonic with respect to the interstellar medium, produce a termination shock where particles are acceler... | pulsar wind nebulae: observations and models of 3c58 and discovery of superefficiency |
clusters of galaxies offer tremendous insight into the formation and evolution of large scale structure in the universe. while most of the total mass of a cluster is in the form of dark matter, the bulk of observable matter exists as a hot x-ray emitting gas called the intracluster medium (icm). studies of x-ray emissi... | chemical and thermodynamic properties of accept2.0 clusters |
low-energy cutoff of the non-thermal electron energy distribution is crucial to derive the total non-thermal electron energy. a flare kernel associated with a c4 class flare was observed in a spectral window including the he i triplet 1083.0 nm and si i 1082.7 nm with a spectro-polarimeter on the domeless solar telesco... | estimation of low-energy cutoff of non-thermal electrons from a spectro-polarimetric observation |
gamma-telescope gamma-400 (gamma astronomical multifunctional modular apparatus) consists of the converter-tracker (c), time-of-flight system tof (2 sections s1 and s2), top (actop) and lateral (aclat) sections of anticoincidence system, position-sensitive calorimeter cc1 makes of 2 strips layers and 2 layers of csi(tl... | background fractal dimension of event temporal profiles in additional aperture of gamma-telescope gamma-400 by results of calibrations on synchrotron "pakhra". |
recent measurements made at the electron beam ion trap (ebit) facility at the smithsonian astrophysical observatory (sao) are presented. the upcoming era of non-dispersive, high-resolution x-ray microcalorimeter missions, including xrism (2023) and athena, is expected to revolutionize x-ray astronomy. results from the ... | measurements from the sao ebit facility in support of x-ray observatories |
solar flares can be prodigious producers of energetic particles, and are thus rich laboratories for studying particle acceleration physics. however, few of the particles accelerated in flares reach spacecraft to be measured. instead, we typically know of these particles through the secondary neutral radiation they emit... | the importance of solar neutrons in understanding solar flares |
most meteorites, which accreted from a disk of gas and dust to form primitive asteroids in the early solar system, reach the earth as chondrites, stony matrix material of the oldest rocks in solar system. particularly important subset of chondrites includes the calcium-aluminum rich inclusions (cais) - mm-to-cm calcium... | the crucial importance of the solar-energized 3he ions during the formation of the solar system |
the x8.2 event of 2017 september 10 provides unique observations to study the genesis, magnetic morphology, impulsive dynamics and shock formation in a very fast coronal mass ejection (cme). as will be discussed in this presentation, fundamental insight in the processes of magnetic reconnection, cme acceleration and sh... | genesis and impulsive evolution of the fast cme associated with the x8.2 flare on 2017 september 10 |
we report x-ray spectroscopic results for four giant solar flares that occurred on 2005 september 7 (x17.0), 2005 september 8 (x5.4), 2005 september 9 (x6.2), and 2006 december 5 (x9.0), obtained from earth albedo data with the x-ray imaging spectrometer (xis) on board suzaku. the good energy resolution of the xis (fwh... | inverse first ionization potential effects in giant solar flares found from earth x-ray albedo with suzaku/xis |
list of xmm-newton epic-pn input datasets which went into the characterisation of the detector energy calibration. provided are a list of normal astronomical observations, and a list of calibration observations. included in the tables are the xmm revolution for an observation, its identifier (obsid), detector mode and ... | vizier online data catalog: calibration list (sanders+, 2020) |
the swampland program aims to distinguish effective theories which can be completed into quantum gravity in the ultraviolet from those which cannot. this article forms an introduction to the field, assuming only a knowledge of quantum field theory and general relativity. it also forms a comprehensive review, covering t... | the swampland: introduction and review |
the renormalization group plays an essential role in many areas of physics, both conceptually and as a practical tool to determine the long-distance low-energy properties of many systems on the one hand and on the other hand search for viable ultraviolet completions in fundamental physics. it provides us with a natural... | the nonperturbative functional renormalization group and its applications |
this is the third volume in a set of books describing state-of-the-art theories and applications of magnetically confined fusion plasmas. this volume presents advanced kinetic theory, aiming to fill the gap between plasma physics textbooks and up-to-date research developments in this field. due to the complexity of mag... | magnetically confined fusion plasma physics, volume 3; kinetic theory |
this review describes the duality between color and kinematics and its applications, with the aim of gaining a deeper understanding of the perturbative structure of gauge and gravity theories. we emphasize, in particular, applications to loop-level calculations, the broad web of theories linked by the duality and the a... | the duality between color and kinematics and its applications |
we present the amplitude for classical scattering of gravitationally interacting massive scalars at third post-minkowskian order. our approach harnesses powerful tools from the modern amplitudes program such as generalized unitarity and the double-copy construction, which relates gravity integrands to simpler gauge-the... | scattering amplitudes and the conservative hamiltonian for binary systems at third post-minkowskian order |
we describe an algebra of observables for a static patch in de sitter space, with operators gravitationally dressed to the worldline of an observer. the algebra is a von neumann algebra of type ii1. there is a natural notion of entropy for a state of such an algebra. there is a maximum entropy state, which corresponds ... | an algebra of observables for de sitter space |
we present the contribution from potential interactions to the dynamics of non-spinning binaries to fourth post-minkowskian (4pm) order. this is achieved by computing the scattering angle to o (g4) using the effective field theory approach and deriving the bound radial action through analytic continuation. we reconstru... | dynamics of binary systems to fourth post-minkowskian order from the effective field theory approach |
general relativity and the $\lambda$cdm framework are currently the standard lore and constitute the concordance paradigm. nevertheless, long-standing open theoretical issues, as well as possible new observational ones arising from the explosive development of cosmology the last two decades, offer the motivation and le... | modified gravity and cosmology: an update by the cantata network |
the passage of time is tracked by counting oscillations of a frequency reference, such as earth's revolutions or swings of a pendulum. by referencing atomic transitions, frequency (and thus time) can be measured more precisely than any other physical quantity, with the current generation of optical atomic clocks report... | atomic clock performance enabling geodesy below the centimetre level |
we present the library collier for the numerical evaluation of one-loop scalar and tensor integrals in perturbative relativistic quantum field theories. the code provides numerical results for arbitrary tensor and scalar integrals for scattering processes in general quantum field theories. for tensor integrals either t... | collier: a fortran-based complex one-loop library in extended regularizations |
we present a formalism for computing classically measurable quantities directly from on-shell quantum scattering amplitudes. we discuss the ingredients needed for obtaining the classical result, and show how to set up the calculation to derive the result efficiently. we do this without specializing to a specific theory... | amplitudes, observables, and classical scattering |
recently it was conjectured that a certain infinite-dimensional "diagonal" subgroup of bms supertranslations acting on past and future null infinity ([inlinemediaobject not available: see fulltext.] and [inlinemediaobject not available: see fulltext.]) is an exact symmetry of the quantum gravity s-matrix, and an associ... | bms supertranslations and weinberg's soft graviton theorem |
all existing quantum-gravity proposals are extremely hard to test in practice. quantum effects in the gravitational field are exceptionally small, unlike those in the electromagnetic field. the fundamental reason is that the gravitational coupling constant is about 43 orders of magnitude smaller than the fine structure... | gravitationally induced entanglement between two massive particles is sufficient evidence of quantum effects in gravity |
einstein's theory of general relativity states that clocks at different gravitational potentials tick at different rates relative to lab coordinates—an effect known as the gravitational redshift1. as fundamental probes of space and time, atomic clocks have long served to test this prediction at distance scales from 30 ... | resolving the gravitational redshift across a millimetre-scale atomic sample |
we propose that holographic entanglement entropy can be calculated at arbitrary orders in the bulk planck constant using the concept of a "quantum extremal surface": a surface which extremizes the generalized entropy, i.e. the sum of area and bulk entanglement entropy. at leading order in bulk quantum corrections, our ... | quantum extremal surfaces: holographic entanglement entropy beyond the classical regime |
we show that a 3d sourced conformal carrollian field theory has the right kinematic properties to holographically describe gravity in 4d asymptotically flat spacetime. the external sources encode the leaks of gravitational radiation at null infinity. the ward identities of this theory are shown to reproduce those of th... | carrollian perspective on celestial holography |
we quantitatively estimate properties of the quark-gluon plasma created in ultrarelativistic heavy-ion collisions utilizing bayesian statistics and a multiparameter model-to-data comparison. the study is performed using a recently developed parametric initial condition model, trento, which interpolates among a general ... | applying bayesian parameter estimation to relativistic heavy-ion collisions: simultaneous characterization of the initial state and quark-gluon plasma medium |
using scattering amplitudes, we obtain the potential contributions to conservative binary dynamics in general relativity at fourth post-minkowskian order o (g4). as in previous lower-order calculations, we harness powerful tools from the modern scattering amplitudes program including generalized unitarity, the double c... | scattering amplitudes and conservative binary dynamics at o (g4) |
no! we show that the field equations of einstein-gauss-bonnet theory defined in generic d >4 dimensions split into two parts one of which always remains higher dimensional, and hence the theory does not have a non-trivial limit to d =4 . therefore, the recently introduced four-dimensional, novel, einstein-gauss-bonn... | is there a novel einstein-gauss-bonnet theory in four dimensions? |
a clock at a higher altitude ticks faster than one at a lower altitude, in accordance with einstein's theory of general relativity. the outstanding stability and accuracy of optical clocks, at 10-18 levels1-5, allows height differences6 of a centimetre to be measured. however, such state-of-the-art clocks have been dem... | test of general relativity by a pair of transportable optical lattice clocks |
in this letter we prove a simple theorem in quantum information theory, which implies that bulk operators in the anti-de sitter/conformal field theory (ads/cft) correspondence can be reconstructed as cft operators in a spatial subregion a , provided that they lie in its entanglement wedge. this is an improvement on exi... | reconstruction of bulk operators within the entanglement wedge in gauge-gravity duality |
we develop an effective field theory (eft) formalism to solve for the conservative dynamics of binary systems in gravity via post-minkowskian (pm) scattering data. our framework combines a systematic eft approach to compute the deflection angle in the pm expansion, together with the `boundary-to-bound' (b2b) dictionary... | post-minkowskian effective field theory for conservative binary dynamics |
we consider the gravity dual of the modular hamiltonian associated to a general subregion of a boundary theory. we use it to argue that the relative entropy of nearby states is given by the relative entropy in the bulk, to leading order in the bulk gravitational coupling. we also argue that the boundary modular flow is... | relative entropy equals bulk relative entropy |
the weak gravity conjecture holds that in a theory of quantum gravity any gauge force must mediate interactions stronger than gravity for some particles. this statement has surprisingly deep and extensive connections to many different areas of physics and mathematics. several variations on the basic conjecture have bee... | weak gravity conjecture |
recently, a novel 4d einstein-gauss-bonnet gravity has been proposed by glavan and lin (2020 phys. rev. lett. 124 081301) by rescaling the coupling $\alpha \to \alpha /(d-4)$ and taking the limit $d\to 4$ at the level of equations of motion. this prescription, though was shown to bring non-trivial effects for some spac... | a note on the novel 4d einstein-gauss-bonnet gravity |
we introduce a — somewhat holographic — dictionary between gravitational observables for scattering processes (measured at the boundary) and adiabatic invariants for bound orbits (in the bulk), to all orders in the post-minkowskian (pm) expansion. our map relies on remarkable connections between the relative momentum o... | from boundary data to bound states |
we study aspects of anti-de sitter space in the context of the swampland. in particular, we conjecture that the near-flat limit of pure ads belongs to the swampland, as it is necessarily accompanied by an infinite tower of light states. the mass of the tower is power-law in the cosmological constant, with a power of 1/... | ads and the swampland |
we review the spectrum and electromagnetic properties of baryons described as relativistic three-quark bound states within qcd. the composite nature of baryons results in a rich excitation spectrum, whilst leading to highly non-trivial structural properties explored by the coupling to external (electromagnetic and othe... | baryons as relativistic three-quark bound states |
we calculate the spin-orbit corrections to the loss of angular momentum in a two-body scattering at third post-minkowskian order, o (g3), from scattering amplitudes using the eikonal operator. these results include effects linear in spin, are valid for generic spin orientations, and are presented in a manifestly poinca... | angular momentum loss due to spin-orbit effects in the post-minkowskian expansion |
quantum metrology uses quantum entanglement—correlations in the properties of microscopic systems—to improve the statistical precision of physical measurements. when measuring a signal, such as the phase shift of a light beam or an atomic state, a prominent limitation to achievable precision arises from the noise assoc... | measurement noise 100 times lower than the quantum-projection limit using entangled atoms |
we propose an ansatz for ope coefficients in chaotic conformal field theories which generalizes the eigenstate thermalization hypothesis and describes any ope coefficient involving heavy operators as a random variable with a gaussian distribution. in two dimensions this ansatz enables us to compute higher moments of th... | random statistics of ope coefficients and euclidean wormholes |
by combining the kmoc-formalism with the exponential representation of the scattering matrix we show that the two-body scattering angle is given by the corresponding matrix element of the exponential representation. this holds to all orders in the post-minkowskian expansion of gravity when restricted to the conservativ... | classical observables from the exponential representation of the gravitational s-matrix |
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