Search results

Items from 1 to 20 out of 483 results

article

In-orbit operations of AGILE mission: 11 years successfully in space

Fabio D’Amico, Marco Tavani, Giovanni Annoni, Cristiano Contini, more

Rendiconti Lincei. Scienze Fisiche e Naturali > 2019 > 30 > 1 > 231-240

Astrorivelatore Gamma ad Immagini LEggero (AGILE) is a high-energy scientific space program funded by the Agenzia Spaziale Italiana (ASI—Italian Space Agency); the mission was developed and is being operated in cooperation with INAF, INFN, CIFS and with the participation of several Italian companies. The satellite was launched from India on April 23rd, 2007 in an LEO equatorial orbit. The scientific...

article

Binary neutron stars gravitational wave detection based on wavelet packet analysis and convolutional neural networks

Bai-Jiong Lin, Xiang-Ru Li, Wo-Liang Yu

Frontiers of Physics > 2020 > 15 > 2 > 1-7

This work investigates the detection of binary neutron stars gravitational wave based on convolutional neural network (CNN). To promote the detection performance and efficiency, we proposed a scheme based on wavelet packet (WP) decomposition and CNN. The WP decomposition is a time-frequency method and can enhance the discriminant features between gravitational wave signal and noise before detection...

article

AGILE search for gamma-ray counterparts of gravitational wave events

Francesco Verrecchia, Marco Tavani, Andrea Bulgarelli, Martina Cardillo, more

Rendiconti Lincei. Scienze Fisiche e Naturali > 2019 > 30 > 1 > 71-77

AGILE is a space mission of the Italian Space Agency dedicated to X-ray and gamma-ray astrophysics operating since 2007. Since the discovery of gravitational wave (GW) events by the LIGO-Virgo Collaboration (LVC) announced in February 2016, AGILE is playing a very important role in the search for possible X-ray and gamma-ray counterparts. The large fields of view of the gamma-ray and hard X-ray imagers...

article

Topical collection: Testing the Kerr spacetime with gravitational-wave and electromagnetic observations

Emanuele Berti

General Relativity and Gravitation > 2019 > 51 > 11 > 1-3

One of the Holy Grails of observational astronomy is to confirm the prediction that black holes in the Universe are described by the Kerr solution of Einstein’s field equations of general relativity. This Topical Collection provides a status report of theoretical and experimental progress towards confirming the “Kerr paradigm” through X-ray astronomy, gravitational lensing, stellar tidal disruption...

article

Calculation of Phase Velocities in the Field of Sea Surface Waves

K. V. Pokazeev, A. S. Zapevalov

Moscow University Physics Bulletin > 2019 > 74 > 4 > 413-418

Specific features of phase velocities of sea waves due to the angular distribution of wave energy and the second harmonic of a dominant wave with a velocity differing from the phase velocity of a free wave at the same frequency have been analyzed. The presence of wave components with different velocity projections on a given direction or different propagation velocities leads to a deviation in the...

article

Dark Matter Objects: Possible New Source of Gravitational Waves

C. Sivaram, Kenath Arun

Earth, Moon, and Planets > 2019 > 123 > 1-2 > 9-13

Gravitational waves from mergers of black holes and neutron stars are now being detected by LIGO. Here we look at a new source of gravitational waves, i.e., a class of dark matter objects whose properties were earlier elaborated. We show that the frequency of gravitational waves and strains on the detectors from such objects (including their mergers) could be within the sensitivity range of LIGO....

article

Numerical Relativity and the Discovery of Gravitational Waves

Robert A. Eisenstein

Annalen der Physik > 531 > 8 > n/a - n/a

Solving Einstein's equations precisely for strong‐field gravitational systems is essential to determining the full physics content of gravitational wave detections. Without these solutions it is not possible to infer precise values for initial and final‐state system parameters. Obtaining these solutions requires extensive numerical simulations, as Einstein's equations governing these systems are much...

article

GRID: a student project to monitor the transient gamma-ray sky in the multi-messenger astronomy era

Jiaxing Wen, Xiangyun Long, Xutao Zheng, Yu An, more

Experimental Astronomy > 2019 > 48 > 1 > 77-95

The Gamma-Ray Integrated Detectors (GRID) is a space mission concept dedicated to monitoring the transient gamma-ray sky in the energy range from 10 keV to 2 MeV using scintillation detectors onboard CubeSats in low Earth orbits. The primary targets of GRID are the gamma-ray bursts (GRBs) in the local universe. The scientific goal of GRID is, in synergy with ground-based gravitational wave (GW) detectors...

article

Geometric Algebra, Gravity and Gravitational Waves

Anthony N. Lasenby

Advances in Applied Clifford Algebras > 2019 > 29 > 4 > 1-41

We discuss an approach to gravitational waves based on Geometric Algebra and Gauge Theory Gravity. After a brief introduction to Geometric Algebra (GA), we consider Gauge Theory Gravity, which uses symmetries expressed within the GA of flat spacetime to derive gravitational forces as the gauge forces corresponding to making these symmetries local. We then consider solutions for black holes and plane...

article

Gravitational wave solutions to linearized Jordan Brans Dicke theory on a cosmological background

Onder Dunya, Metin Arik

General Relativity and Gravitation > 2019 > 51 > 7 > 1-12

Approximate solutions of Jordan–Brans–Dicke (JBD) theory for perturbed scalar field and perturbed Robertson–Walker metric, were found for an era dominated by the scalar field. Solutions for the scale factor a(t) and the scalar field $$\phi (t)$$ ϕ(t) in unperturbed JBD theory are dependent on the $$\omega $$ ω parameter which determines how the scalar field is coupled to geometry of space–time....

article

The delay time of gravitational wave — gamma-ray burst associations

Bing Zhang

Frontiers of Physics > 2019 > 14 > 6 > 1-11

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, Δt, of GW-GRB associations within the context of compact binary coalescence (CBC) — short GRB (sGRB) associations and GW burst...

article

Testing the nature of dark compact objects: a status report

Vitor Cardoso, Paolo Pani

Living Reviews in Relativity > 2019 > 22 > 1 > 1-104

Very compact objects probe extreme gravitational fields and may be the key to understand outstanding puzzles in fundamental physics. These include the nature of dark matter, the fate of spacetime singularities, or the loss of unitarity in Hawking evaporation. The standard astrophysical description of collapsing objects tells us that massive, dark and compact objects are black holes. Any observation...

article

The astrophysics of nanohertz gravitational waves

Sarah Burke-Spolaor, Stephen R. Taylor, Maria Charisi, Timothy Dolch, more

The Astronomy and Astrophysics Review > 2019 > 27 > 1 > 1-78

Pulsar timing array (PTA) collaborations in North America, Australia, and Europe, have been exploiting the exquisite timing precision of millisecond pulsars over decades of observations to search for correlated timing deviations induced by gravitational waves (GWs). PTAs are sensitive to the frequency band ranging just below 1 nanohertz to a few tens of microhertz. The discovery space of this band...

article

Propagation of polar gravitational waves in f(R, T) scenario

M. Sharif, Aisha Siddiqa

General Relativity and Gravitation > 2019 > 51 > 6 > 1-14

This paper investigates the propagation of polar gravitational waves in the spatially flat FRW universe consisting of a perfect fluid in the scenario of $$R+2\lambda T$$ R+2λT model of f(R, T) gravity ($$\lambda $$ λ being the model parameter). The spatially flat universe model is perturbed via Regge–Wheeler perturbations inducing polar gravitational waves and the field equations are formulated...

article

Plane Gravitational Waves in Spatially-Homogeneous Models of type-(3.1) Stäckel Spaces

E. K. Osetrin, K. E. Osetrin, A. E. Filippov

Russian Physics Journal > 2019 > 62 > 2 > 292-301

A classification is performed of the spaces with plane-wave metrics in accordance with the presence of three-dimensional subgroups of the group of space-time motion with three-dimensional spatial orbits. In order to obtain spatially-homogeneous models, exact solutions to Einstein’s vacuum equations are found. To obtain these solutions, the Petrov and Bianchi classifications are performed. The results...

article

An independent search of gravitational waves in the first observation run of advanced LIGO using cross-correlation

Javier M. Antelis, Claudia Moreno

General Relativity and Gravitation > 2019 > 51 > 5 > 1-17

This work describes a template-free method to search gravitational waves (GW) using data from the LIGO observatories simultaneously. The basic idea of this method is that a GW signal is present in a short-duration data segment if the maximum correlation-coefficient between the strain signals is higher than a significant threshold and its time difference is lower than the 10 ms of inter-observatory...

article

Measurement of Tidal Deformability in the Gravitational Wave Parameter Estimation for Nonspinning Binary Neutron Star Mergers

Yong-Beom Choi, Hee-Suk Cho, Chang-Hwan Lee, Young-Min Kim

Journal of the Korean Physical Society > 2019 > 74 > 9 > 842-846

One of the main targets for ground-based gravitational wave (GW) detectors such as Advanced LIGO (Laser Interferometer Gravitational wave Observatory) and Virgo is coalescences of neutron star (NS) binaries. Even though a NS’s macroscopic properties such as mass and radius have been obtained from electro-magnetic wave observations, its internal structure has been studied mainly by using theoretical...

article

Multiwavelength studies of gravitational wave sources: Physics and phenomenology

N. R. Tanvir

Astronomische Nachrichten > 340 > 4 > 346 - 350

The discovery of binary neutron star merger GW170817 from its gravitational wave (GW) signature, together with its accompanying electromagnetic (EM) emission spanning gamma‐ray to radio, marked the birth of GW + EM multimessenger astrophysics. The radioactively powered thermal kilonova, which dominated the ultraviolet to infrared in the hours to weeks after the merger, indicates that such mergers...

article

Null Geodesies in Static Warped Braneworld

Tae Hoon Lee

Journal of the Korean Physical Society > 2019 > 74 > 8 > 751-755

We consider spherically symmetric spacetimes embedded in a 5-dimensional static Lorentzian manifold. Studying the null geodesic equations in warped spacetimes bounded by static 3-branes, we discuss possible relations of particles following the geodesics with the gravitational waves detected recently.

article

Multi‐messenger observations of supermassive black holes binary mergers

F. A. C. Pereira, I. Rodrigues, M. E. S. Alves, G. Lodato, more

Astronomische Nachrichten > 340 > 1-3 > 54 - 56

When a circumprimary gaseous disk is pushed into the primary supermassive black hole (SMBH) by the tidal force of the decaying secondary black hole, it can produce an increase in the luminosity. In the case of a disk that lies in the same plane of the SMBHs binary, that luminosity exceeds the Eddington limit. In this paper, we extend these previous investigations to the case of systems misaligned...

Publication date

Last 3 months (6)
Last year (34)
Last 3 years (88)

Close

Date range setting

Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.

From:

To:
Set your own date range

Content availability

Available (475)
None (8)

Publication type

article (458)
book (25)

Publication language

English (482)
French (1)

Keywords

GRAVITATIONAL WAVES (483)
BLACK HOLE PHYSICS (37)
STARS: NEUTRON (37)
BLACK HOLES (30)
NEUTRON STARS (28)
GENERAL RELATIVITY (27)
PULSARS: GENERAL (21)
LIGO (15)
GRAVITATIONAL WAVE DETECTORS (13)
HYDRODYNAMICS (12)
INTERFEROMETRY (12)
NEUTRINOS (12)
DETECTORS (11)
THERMAL NOISE (11)
VIRGO (11)
[PHYSICAL ASTRONOMY CLASSIFICATION SCHEME] 04.80.NN (11)
COSMOLOGY (10)
DATA ANALYSIS (10)
RELATIVITY (10)
DARK MATTER (9)
GRAVITATION (9)
INTERFEROMETER (9)
ACCRETION, ACCRETION DISCS (8)
BINARIES: CLOSE (8)
COSMOLOGY: THEORY (8)
ONDES GRAVITATIONNELLES (8)
STARS: OSCILLATIONS (8)
STARS: ROTATION (8)
[PHYSICAL ASTRONOMY CLASSIFICATION SCHEME] 95.55.YM (8)
DARK ENERGY (7)
DENSE MATTER (7)
EQUATION OF STATE (7)
GALAXIES: NUCLEI (7)
GAMMA-RAY BURSTS (7)
INFLATION (7)
INTERFEROMETERS (7)
METHODS: DATA ANALYSIS (7)
ACCRETION DISKS (6)
GALAXIES: ACTIVE (6)
LISA (6)
METHODS: NUMERICAL (6)
METHODS: STATISTICAL (6)
PULSARS (6)
STELLAR DYNAMICS (6)
SUPERNOVAE (6)
BINARIES (5)
COSMIC RAYS (5)
COSMOLOGY: MISCELLANEOUS (5)
EARLY UNIVERSE (5)
ELECTROMAGNETIC WAVES (5)
EQUIVALENCE PRINCIPLE (5)
GRAVITATIONAL-WAVE DETECTORS (5)
NOISE (5)
NUMERICAL RELATIVITY (5)
WHITE DWARFS (5)
[PHYSICAL ASTRONOMY CLASSIFICATION SCHEME] 62.40.+I (5)
ACCRETION (4)
ALTERNATIVE THEORIES OF GRAVITY (4)
ASTEROSEISMOLOGY (4)
COMPACT OBJECTS (4)
COSMIC MICROWAVE BACKGROUND (4)
ELISA (4)
EXACT SOLUTIONS (4)
GALAXIES: EVOLUTION (4)
GLOBULAR CLUSTERS: GENERAL (4)
GRAVITATIONAL LENSING (4)
INERTIA (4)
LIGHT INTERFEROMETERS (4)
LISA PATHFINDER (4)
MOND (4)
OPTICAL INTERFEROMETRY (4)
POLARIZATION (4)
R-MODE INSTABILITY (4)
STARS: MAGNETIC FIELD (4)
SUPERNOVAE: GENERAL (4)
SUSPENSIONS (4)
ASTROPHYSICS (3)
ATMOSPHERES (3)
BINARIES: GENERAL (3)
CASSINI (3)
CAVITY RESONATORS (3)
COMPACT BINARIES (3)
COSMIC STRINGS (3)
DETECTION (3)
DISTANCE SCALE (3)
EINSTEIN TELESCOPE (3)
EXTRA DIMENSIONS (3)
EXTREME BINARY BLACK HOLE SYSTEM (3)
FLUCTUATIONS (3)
FUSED SILICA (3)
GALAXIES: KINEMATICS AND DYNAMICS (3)
GRAVITATIONAL FIELDS (3)
INSTABILITIES (3)
IONOSPHERES (3)
KERR BLACK HOLE (3)
LARGE NUMBER HYPOTHESIS (3)
LASER INTERFEROMETRY (3)
LIGHT INTERFEROMETRY (3)
MACH’S PRINCIPLE (3)
MEASUREMENT BY LASER BEAM (3)
more

Data set

Springer (204)
Elsevier (147)
Wiley (100)
ieee (25)
PSJD (4)
BazTech (2)
CEJSH (1)

INFONA - science communication portal

Search results

In-orbit operations of AGILE mission: 11 years successfully in space

Binary neutron stars gravitational wave detection based on wavelet packet analysis and convolutional neural networks

AGILE search for gamma-ray counterparts of gravitational wave events

Topical collection: Testing the Kerr spacetime with gravitational-wave and electromagnetic observations

Calculation of Phase Velocities in the Field of Sea Surface Waves

Dark Matter Objects: Possible New Source of Gravitational Waves

Numerical Relativity and the Discovery of Gravitational Waves

GRID: a student project to monitor the transient gamma-ray sky in the multi-messenger astronomy era

Geometric Algebra, Gravity and Gravitational Waves

Gravitational wave solutions to linearized Jordan Brans Dicke theory on a cosmological background

The delay time of gravitational wave — gamma-ray burst associations

Testing the nature of dark compact objects: a status report

The astrophysics of nanohertz gravitational waves

Propagation of polar gravitational waves in f(R, T) scenario

Plane Gravitational Waves in Spatially-Homogeneous Models of type-(3.1) Stäckel Spaces

An independent search of gravitational waves in the first observation run of advanced LIGO using cross-correlation

Measurement of Tidal Deformability in the Gravitational Wave Parameter Estimation for Nonspinning Binary Neutron Star Mergers

Multiwavelength studies of gravitational wave sources: Physics and phenomenology

Null Geodesies in Static Warped Braneworld

Multi‐messenger observations of supermassive black holes binary mergers

Filter options

Publication date

Content availability

Publication type

Publication language

Keywords

Data set

INFONA - science communication portal

Search results

Add recipient

Sending message cancelled

Are you sure you want to cancel sending this message?

Send message

Filter options

Publication date

Date range setting

Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.

Content availability

Publication type

Publication language

Keywords

Data set

Reporting an error / abuse

Sending the report failed

Accessibility options