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View the News Archive here. On the 30 th of April,the LIGO and Virgo collaborations plan to release bulk strain data taken during the first six months of O3. This is the O3a data release. It includes data taken between the 1 st of April,and the 30 th of September, We plan to release the remaining strain data from O3 later this year.

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In the latest issue of the scientific journal Nature, a roadmap dedicated to the future of gravitational wave research has been published. This is a field of research that promises to continue to challenge the most established astrophysical and cosmological scenarios in the coming years, while also providing important new observations to help in their updating. According to the article in Nature, over the next 20 years gravitational-wave physics will be able to make a decisive contribution to the answering of some of the fundamental questions facing the entire physics community. These cover areas such as the nature of the dark matter and dark energy that pervade the cosmos, new clues as to what the 'gravitational fingerprint' of the early Universe might offer us, or the not yet fully understood physical mechanisms at play in star collapses or neutron stars.

This is just to name a few of the most exciting and important challenges in physics, astrophysics and cosmology today. In the coming years, LIGO, Virgo and KAGRA, will pass through coordinated data-taking and experimental-upgrade periods, which will help to boost their sensitivity and lead them to detect more than one gravitational event per day during the fifth observation period, O5, after There are therefore great expectations for the new findings and that are anticipated from the next runs.

The scientific community is convinced that it is essential to continue along this path with increasingly powerful and sensitive instruments and detectors. It is therefore important to put in place now, the roadmap that will lead in the coming years to the building and operation of new infrastructures for gravitational-wave research. The authors of this roadmap article are, in fact, all join wave meeting via wave web portal the scientists of the Gravitational Wave International Committee GWICwhich was set up in to facilitate international collaboration and cooperation for the construction of the main infrastructures dedicated to the detection of gravitational waves.

Nature has published this roadmap, noting once again the increasing attention of the wider scientific community to this field. In the paper, we list a of fundamental questions to be addressed through GW observations, which represent an extremely ambitious scientific programme, able to dramatically widen our knowledge of the cosmos.

The future generation of ground-based observatories, planned forthe Einstein Telescope in Europe and the Cosmic Explorer in the USAand the LISA space mission, will be able to dramatically extend the observation window for gravitational als and intercept not only the cosmic join wave meeting via wave web portal produced by the fusion of black holes and neutron stars, but also the gravitational als generated in the early phases of the life of our Universe.

In addition to interferometric detectors, Pulsar Timing Array PTA telescopes, with their larger antenna networks, more sensitive receivers and broader bandwidth, will likely be able to follow the dynamics of the largest galaxies in the Universe. The broadest horizon of these is of course that of Multi-Messenger Astronomy, whereby gravitational observations can be crossed and complemented with those of electromagnetic telescopes and particle detectors. The observation of the merger of two neutron stars in Augustwas the first exceptional example of this kind, with the t observation with gravitational waves from the LIGO and Virgo interferometers and electromagnetic radiation from dozens of telescopes on the ground and in space.

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Stavros Katsanevas, director of the European Gravitational Observatory, added, "The most extraordinary thing in this roadmap, is not only that the worldwide gravitational-wave community is forming a closely knit network of detectors, covering the globe, including space, and plans a coherent and well coordinated future, but that at the same time all the measures are taken so that a similarly coordinated network of observatories, detectors and satellites is currently deployed and will be deployed in the near future.

This means that a multi-messenger understanding of cosmic processes, using messengers from gravitational to electromagnetic waves and cosmic rays and neutrinos, will be possible, probing events that happened millions of years ago. It will be possible to follow their evolution, second per second, from their violent beginnings and for months afterwards.

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This is clearly a new era of Astrophysics, the Multi-messenger era. Image: Artist's interpretation of the merging of two black holes releasing gravitational waves. Change article language :.

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While Virgo and LIGO have been undergoing upgrades, the data from the early part of the third observing run of the detectors from April to September,have been analysed by researchers to look for s of continuous emission of gravitational waves from rapidly spinning neutron stars. This makes it possible to set new, clear constraints for future searches. Theory has it that, as they rotate, neutron stars emit continuous gravitational waves, because of asymmetries in the mass distribution around the rotation axis. Through the analysis of these gravitational-wave als, scientists can probe and study the inner structure and composition of these extremely intriguing astrophysical objects.

Researchers of the LIGO and Virgo collaborations have looked for these continuous emission als, focusing on those emitted from neutron stars in binary systems. Due to the movement and rotation of the Earth, this wave would appear with a characteristic frequency modulation, further characterised by the binary nature of the system.

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After integrating the data stream over the six-month period to accumulate a large al-to-noise ratio, no evidence of this ature modulation has been found. However, researchers have determined the maximum distance from the Earth that the search was able to probe and the maximum deformation allowed for a neutron star within this range, setting a clear constraint for future analysis.

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The were released on the 25th of December on arXiv. While this pulsar spins, it loses energy, as all pulsars do, but this one is special because it is both the fastest spinning young pulsar we know of and the one with the largest rate of energy loss. If all of this lost energy was light, it would be abouttimes the luminosity of the Sun. Actually some of the energy could be lost as gravitational waves, and, if so, how much of it? The remaining energy has to be emitted through other mechanisms: for example X-ray and Gamma ray emissions or through the acceleration of charged particles, to create the so-called pulsar wind nebula.

Image: A pulsar pink can be seen at the centre of the Messier 82 galaxy in this multi-wavelength portrait. The three scientific collaborations foresee further potential refinements in the coming months, as the impact of the pandemic on the scheduled detector upgrades is more fully understood.

Join wave meeting via wave web portal of ificant modifications to detector systems during the next six months will refine the understanding of COVID impacts on the schedule. A revised projection of the O4 start date will be given in springbased on lessons learned. Image: The roof cover on the north arm of Virgo was elevated during the summer ofto allow for the installation of new suspensions and small clean rooms, required for an additional metre-long optical-cavity.

The classification and definitive analysis of the 39 events detected by Virgo and LIGO in the third observation period which ran from April to October was published today on the ArXiv online archive.

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Most of these are black hole mergers, the characteristics of which, however, question some established astrophysical models and open up new scenarios. A likely merger of neutron stars and two probable 'mixed' neutron star-black hole systems were also detected in the same period. It took a year of work and complex analysis by the researchers of the Virgo and LIGO scientific collaborations to complete the study of all of the gravitational-wave als that were recorded by the Virgo interferometer, installed at the European Gravitational Observatory, in Italy, and the two LIGO detectors, in the US, during the data-taking period - called 'O3a' - which ran from the 1st of April to the 1st of October, Events included: 36 mergers of black holes; a likely merger of a binary system of neutron stars; and two systems that were most likely composed of a black hole and a neutron star.

It represents a wealth of observations and data on the physics of black holes, barely imaginable until only a few years ago.

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For more information, please. Indeed, between September,and April,the sensitivity of the three detectors has been ificantly improved. This has led, for example, to Virgo becoming capable of observing a volume of the universe almost ten times larger than in the observational run O2. As well as opening a new and exciting phase in the history of human observation of the cosmos, we are seeing events that either lacked observational evidence until now, or go beyond our current understanding of stellar evolution", said Ed Porter, directeur de recherche CNRS at APC-Paris, and member of the Virgo Collaboration.

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The detection of gravitational als allows us, in fact, for the first time, to closely observe the dynamics of extraordinary mergers of black holes and neutron stars, which release bursts of energy equivalent to several solar masses in gravitational waves. This allows us to study, as never before, the physics of black holes, the cosmic phenomena that generate them and even the characteristics of the largest populations of black holes. Actually, the of the present catalogue raise serious questions about the validity of some of the astrophysical scenarios and models, which until now seemed the most plausible.

In particular, the masses of black holes, presented in the O3a catalogue, question various theoretical and observational limits on the mass ranges of black hole populations.

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Some observations, for example, indicate the presence of compact objects which could be either black holes or neutron stars exactly in the gap between the mass of the heaviest neutron stars and that of the lightest black holes observed by astronomers to date. This gap could therefore narrow or even disappear. Other observed black holes have a mass with a value between 65 and join wave meeting via wave web portal masses; a range forbidden by stellar evolution models.

According to these models, the very massive stars, beyond a certain threshold, are completely disrupted by the supernova explosion, due to a process called pair instability, and leave behind only gas and cosmic dust. The existence of black holes in the range prohibited by pair instability suggests other mechanisms of black hole formation, such as the merger of smaller black holes or the collision of massive stars, but may also indicate the need to revise our description of the final stages of the lives of stars.

The publication of the O3a catalogue is the conclusion of complex work involving many phases and covering detector calibration, data characterisation and data analysis.

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The catalogue for each observation run is only published once researchers have the final validated dataset, thus making it possible to estimate the physical parameters such as distance, mass and spins of the black-hole and neutron-star mergers, as well as a confident estimate of their margins of error. Of the 39 events presented in this latest catalogue, 26 were announced immediately after detection, while 13 are reported for the first time in the paper published today. In addition to the LIGO-Virgo events catalogue, three other articles have also been released today on the arXiv server: the global analysis of the astrophysical properties of the gravitational-waves sources; new tests of the theory of general relativity; and the search for gravitational-wave als coincident with gamma-ray bursts.

The very high of events still to analyse and understand promises that the next catalogue will be as exciting, if not more so, than this one. Meanwhile, we are striving to implement a substantial upgrade of the Virgo detector, aiming to pursue the next run, inagain with a considerably improved sensitivity. Two citizen-science projects, Gravity Spy for LIGO and the European project, REINFORCE for Virgo, allow everyone to contribute to the identification of spurious als and therefore to the discovery of new gravitational-waves als, by collaborating directly with researchers involved in the analysis of the data of the three interferometers.

In fact, although external as well as internal noise join wave meeting via wave web portal are minimised, the data taken by the interferometers are still plagued by some disturbances. In some cases these are monitored by witness sensors and are then subtracted from the data in real time.

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Nevertheless the identification of other noises is more problematic and requires off-line dedicated analysis in order to flag them. This is the case with glitchy noises; those that are generated, for instance, by light scattered off the main laser beam and that then recombine with it.

The careful studies required to claim a true gravitational-wave al explain why the LIGO and Virgo Collaborations issue alerts of a candidate event to the scientific community soon after it has been measured. This can then either be confirmed by subsequent analysis and hence considered a true al or not. Each localisation - represented by shaded areas on the map - is deduced on the basis of information provided by the three detectors in the network.

The day and time of arrival on Earth, a scientific name and the time it took the al to reach the Earth from wherever in the Universe it was generated, are all recorded.

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The smaller the shaded area in the sky map, the better the al has been localised. Localisation is crucial in enabling follow-up searches with different messengers, such as light or neutrinos. The Nobel Prize in Physics was awarded to Roger Penrose, Reinhard Genzel and Andrea Ghez for their discoveries about one of the most join wave meeting via wave web portal phenomena in the universe, the black hole.

Since then Virgo and LIGO have detected dozens of binary systems of black holes, allowing us to take a closer look at the physics of these still partly mysterious objects and at the mechanisms of their formation. This year's Nobel Prize encourages us to continue our research. Image: An artist's depiction of a black hole at the center of a galaxy. Quantum mechanics does not only describe how the world works on its smallest scales, but also affects the motion of macroscopic objects, such as the 42 kg mirrors of the Virgo interferometer.

To detect gravitational waves, Virgo and LIGO measure tiny changes in the lengths of their laser interferometer arms, changes as small as one thousandth of a proton diameter. The two detectors use laser light to measure, with the highest precision, the relative position of mirrors that are kilometres apart. For this reason, these mirrors are kept as 'still' as possible and are shielded from all possible noises of human or environmental origin.

Even in the absence of any gravitational-wave als or noise sources, these mirror position measurements would show a slight jitter.

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This is due to the so-called shot noise, i. In both Virgo and LIGO, during the third observation period O3this noise was reduced by 'squeezing' the light, using a particular quantum optics technique.

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Unfortunately, it is not possible to do this without paying a price. Following one of the fundamental laws of quantum mechanics - Heisenberg's uncertainty principle - a reduced shot noise in increased radiation pressure noise: the force with which the stream of light particles pushes on the mirrors, fluctuates more strongly.