Constraints on Black-Hole Charges with the 2017 EHT Observations of M87*
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Constraints on Black-Hole Charges with the 2017 EHT Observations of M87*
PHYSICAL REVIEW D 103, 104047 (2021) Constraints on black-hole charges with the 2017 EHT observations of M87* – Prashant Kocherlakota ,1 Luciano Rezzolla,1 3 Heino Falcke,4 Christian M. Fromm,5,6,1 Michael Kramer,7 Yosuke Mizuno,8,9 Antonios Nathanail,9,10 H´ector Olivares,4 Ziri Younsi,11,9 Kazunori Akiyama,12,13,5 Antxon Alberdi,14 Walter Alef,7 Juan Carlos Algaba,15 Richard Anantua,5,6,16 Keiichi Asada,17 Rebecca Azulay,18,19,7 Anne-Kathrin Baczko,7 David Ball,20 Mislav Baloković,5,6 John Barrett,12 Bradford A. Benson,21,22 Dan Bintley,23 Lindy Blackburn,5,6 Raymond Blundell,6 Wilfred Boland,24 Katherine L. Bouman,5,6,25 Geoffrey C. Bower,26 Hope Boyce,27,28 – Michael Bremer,29 Christiaan D. Brinkerink,4 Roger Brissenden,5,6 Silke Britzen,7 Avery E. Broderick,30 32 Dominique Broguiere,29 Thomas Bronzwaer,4 Do-Young Byun,33,34 John E. Carlstrom,35,22,36,37 Andrew Chael,38,39 Chi-kwan Chan,20,40 Shami Chatterjee,41 Koushik Chatterjee,42 Ming-Tang Chen,26 Yongjun Chen (陈永军),43,44 Paul M. Chesler,5 Ilje Cho,33,34 Pierre Christian,45 John E. Conway,46 James M. Cordes,41 Thomas M. Crawford,22,35 Geoffrey B. Crew,12 Alejandro Cruz-Osorio,9 Yuzhu Cui,47,48 Jordy Davelaar,49,16,4 Mariafelicia De Laurentis,50,9,51 – Roger Deane,52 54 Jessica Dempsey,23 Gregory Desvignes,55 Sheperd S. Doeleman,5,6 Ralph P. Eatough,56,7 Joseph Farah,6,5,57 Vincent L. -
Dream Image the Search for That One Elusive Image
What? Dream image The search for that one elusive image. Why? The gravitational force around a black hole is so strong that it distorts time and space: even light cannot escape. Demonstrating the existence of black holes confirms the theories Einstein developed on gravity in physics. Who? Heino Falcke, professor of radio astronomy and astroparticle physics at the Radboud University Nijmegen, together with colleagues from Radboud University, the University of Amsterdam, Leiden University and the The shadow of University of Groningen, as well as an international team of astronomers. Where? Eight telescopes spread across the globe that together form the Event Horizon Telescope (EHT). the black hole Result? The first image of the shadow of a black hole. Finally we know what a black hole looks like. In April, an international team of astronomers presented the very first image of the shadow of a black hole. ‘ TEXT: MARION DE BOO IMAGES : HOLLANDSE HOOGTE ‘I felt like Christopher Columbus. We Big dreams saw things that none of us had ever Did he ever doubt this wild plan? ‘I often have big dreams, seen before,’ says Heino Falcke. On 10 it’s in my DNA. And then I’ll do everything in my power to April 2019, the radio astronomer working make them come true,’ Falcke says. ‘But until that mo- in Nijmegen presented the very first ima- ment arrives, you’re never sure if it’s really going to suc- ge of the light bending around the black ceed.’ In 1994 he obtained his PhD summa cum laude at hole in M87 galaxy. -
Foreign Rights Guide
FOREIGN RIGHTS GUIDE Spring 2020 Fiction Non-Fiction FICTION FICTION HIGHLIGHT Based on a true story ENGLISH BOOKLET AVAILABLE A powerful novel about history’s darkest chapter, the German secret service in New SAMPLE TRANSLATION AVAILABLE York City and the activities of Nazis in Manhattan in the late 1930s. End of the 30s: Before the Americans entered the war, the streets of New York are in a tumult. Anti-Semitic and racist groups are eager for the sympathy of the masses, German nationalists celebrate Hitler as the man of the hour. Josef Klein, himself an immigrant from Germany, lives relatively untouched by all this. His world is the multicultural streets of Harlem. His great passion is the amateur radio. That is how he meets Lauren, Miss Doubleyoutwo, a young activist who has great sympathy for the calm German. But Josef‘s technical abilities as a radio operator attract the attention of influential men, and even before he can interpret the events correctly, Josef is already a little cog in the big wheel of the espionage network of the German defense. Ulla Lenze delivers a smart and gripping novel about the unknown history of the Germans in the US during the Second World War. The incredible life story of the emigrant Josef Klein, who is targeted by the world powers in New York, reveals the espionage activities of the Nazi regime in the US and tells about political entanglements far away from home. Ulla Lenze Highly acclaimed author The Radio Operator Sold into 9 territories before 302 pages publication Hardcover February 2020 ISBN: 978-3-608-96463-9 Rights sold to: Italy/Marsilio, The Netherlands/ Meridiaan, USA/HarperVia (English WR), Brazil/Harper Collins, France/Hachette (Lattès), Finland/Like Publishing, Croatia/Fraktura, Ulla Lenze, born in Mönchengladbach in 1973, studied Music and Spain/Salamandra, Greece/Patakis Philosophy in Cologne. -
Global Program
PROGRAM Monday morning, July 13th La Sapienza Roma - Aula Magna 09:00 - 10:00 Inaugural Session Chairperson: Paolo de Bernardis Welcoming addresses Remo Ruffini (ICRANet), Yvonne Choquet-Bruhat (French Académie des Sciences), Jose’ Funes (Vatican City), Ricardo Neiva Tavares (Ambassador of Brazil), Sargis Ghazaryan (Ambassador of Armenia), Francis Everitt (Stanford University) and Chris Fryer (University of Arizona) Marcel Grossmann Awards Yakov Sinai, Martin Rees, Sachiko Tsuruta, Ken’Ichi Nomoto, ESA (acceptance speech by Johann-Dietrich Woerner, ESA Director General) Lectiones Magistrales Yakov Sinai (Princeton University) 10:00 - 10:35 Deterministic chaos Martin Rees (University of Cambridge) 10:35 - 11:10 How our understanding of cosmology and black holes has been revolutionised since the 1960s 11:10 - 11:35 Group Picture - Coffee Break Gerard 't Hooft (University of Utrecht) 11:35 - 12:10 Local Conformal Symmetry in Black Holes, Standard Model, and Quantum Gravity Plenary Session: Mathematics and GR Katarzyna Rejzner (University of York) 12:10 - 12:40 Effective quantum gravity observables and locally covariant QFT Zvi Bern (UCLA Physics & Astronomy) 12:40 - 13:10 Ultraviolet surprises in quantum gravity 14:30 - 18:00 Parallel Session 18:45 - 20:00 Stephen Hawking (teleconference) (University of Cambridge) Public Lecture Fire in the Equations Monday afternoon, July 13th Code Classroom Title Chairperson AC2 ChN1 MHD processes near compact objects Sergej Moiseenko FF Extended Theories of Gravity and Quantum Salvatore Capozziello, Gabriele AT1 A Cabibbo Cosmology Gionti AT3 A FF3 Wormholes, Energy Conditions and Time Machines Francisco Lobo Localized selfgravitating field systems in the AT4 FF6 Dmitry Galtsov, Michael Volkov Einstein and alternatives theories of gravity BH1:Binary Black Holes as Sources of Pablo Laguna, Anatoly M. -
EU-Funded Scientists Unveil First Ever Image of a Black Hole
European Commission - Press release EU-funded scientists unveil first ever image of a black hole Brussels, 10 April 2019 The Commission is today revealing the first ever image of a black hole taken by Event Horizon Telescope, a global scientific collaboration involving EU-funded scientists. This major discovery provides visual evidence for the existence of black holes and pushes the boundaries of modern science. The first ever observation of a black hole is the result of the large scale international research collaboration Event Horizon Telescope (EHT), where EU-funded researchers have played a key role. This major scientific achievement marks a paradigm shift in our understanding of black holes, confirms the predictions of Albert Einstein's General Theory of Relativity and opens up new lines of enquiry into our universe. The first image of a black hole successfully captured was unveiled in six simultaneous press conferences across the globe today. Commissioner Carlos Moedas, responsible for Research, Science, and Innovation, said: “Fiction often inspires science, and black holes have long fueled our dreams and curiosity. Today, thanks to the contribution of European scientists, the existence of black holes is no longer just a theoretical concept. This amazing discovery proves again how working together with partners around the world can lead to achieving the unthinkable and moving the horizons of our knowledge.” President of the European Research Council (ERC), Professor Jean-Pierre Bourguignon, added: “I congratulate the scientists across the globe who made this inspiring discovery and pushed the frontiers of our knowledge. I'm especially glad to see that scientists funded by the European Research Council contributed decisively to this breakthrough. -
MG15 Plenary Session
Monday, July 2 Tuesday, July 3 Wednesday, July 4 Thursday, July 5 Friday, July 6 Saturday, July 7 KILONOVAE AND GRAVITATIONAL MULTIMESSANGER Topic MATHEMATICS AND GENERAL RELATIVITY FUTURE PRECISION TESTS OF GR GRBs AND CMB THE FRONTIERS WAVES ASTROPHYSICS Chair: CLAUS LAEMMERZAHL Chair: MARCO TAVANI Chair: REMO RUFFINI Chair: ENRICO COSTA Chair: PAOLO GIOMMI Chair: FULVIO RICCI Marcel Grossmann Awards ELENA PIAN STEFANO VITALE VICTORIA KASPI RAZMIK MIRZOYAN MARKUS ARNDT 1. LYMAN PAGE Kilonovae: the cosmic Gravitation Wave Gamma-Ray and Experiments to Probe 9.00 – 9.35 Fast Radio Bursts 2. THE PLANCK SCIENTIFIC COLLABORATION foundries of heavy elements Astronomy in ESA science Multi-Messenger Quantum Linearity at the 3. RASHID SUNYAEV programme Highlights with MAGIC Interface to Gravity & 4. HEPL - Stanford Complexity 5. SHING-TUNG YAU NIAL TANVIR TAKAAKI KAJITA BING ZHANG ELISA RESCONI TOBIAS WESTPHAL Lectio Magistralis A new era of gravitational- From gamma-ray bursts Neutrino Astronomy in Micro-mechanical Status of KAGRA and its 9.35-10.10 wave/electromagnetic to fast radio bursts: the Multi-messenger measurements of weak scientific goals SHING-TUNG YAU multi-messenger astronomy unveiling the mystery of Era gravitational forces Quasi-local mass at null infinity cosmic bursting sources MASAKI ANDO FRANCIS HALZEN SHU ZHANG TSVI PIRAN RASHID SUNYAEV DECIGO : Gravitational-Wave JEAN-LOUP PUGET IceCube: Opening a Introduction to Insight- Mergers and GRBs: past 10.10-10.45 Observation from Space The Planck mission New Window on the HXMT: -
Arxiv:2010.05354V1 [Gr-Qc] 11 Oct 2020
Black hole or Gravastar? The GW190521 case I. Antoniou1, ∗ 1Department of Physics, University of Ioannina, GR-45110, Ioannina, Greece (Dated: August 31, 2021) The existence of cosmological compact objects with very strong gravity is a prediction of General Relativity and an exact solution of the Einstein equations. These objects are called black holes and recently we had the first observations of them. However, the theory of black hole formation has some disadvantages. In order to avoid these, some scientists suggest the existence of gravastars (gravitation vacuum stars), an alternative stellar model which seems to solve the problems of the black hole theory. In this work we compare black holes and gravastars using a wide range of the literature and we emphasize the properties of gravastars, which are consistent with the current cosmological observations. Also, we propose gravastars as the solution of the ”pair-instability” effect and a possible explanation for the observed masses of the compact objects, before the collapse, from the gravitational signal GW190521, since in the formation of a gravastar there aren’t mass restrictions. PACS numbers: 98.62.Ai, 04.20.Cv, 04.30.-w I. INTRODUCTION black holes, or some other compact object with very strong gravity. Many scientists dispute the One of the most attractive concepts in Gen- existence of black holes because if we take into ac- eral Relativity is the existence and the properties count quantum effects, the gravitational collapse of black holes, a region of spacetime where grav- of objects comes to a halt and furthermore no ity is so strong that nothing, no particles or even event horizon forms [2]. -
81 EMBARGOED UNTILLTHURSDAY JULY 4 20:00 CET Nijmegen, July 2, 2013 Farewell Greeting from a Dying Star
PB 2012 - 81 EMBARGOED UNTILLTHURSDAY JULY 4 20:00 CET Nijmegen, July 2, 2013 Farewell greeting from a dying star – Scientists suggest explanation for mysterious radio flashes Mysterious bright radio flashes that appear for only a brief moment on the sky and do not repeat could be the final farewell greetings of a massive star collapsing into a black hole, astronomers from Nijmegen and Potsdam argue. Radio telescopes have picked up some bright radio flashes that appear for only a brief moment on the sky and do not repeat. Scientists have since wondered what causes these unusual radio signals. An article in this week’s issue of ‘Science’ suggests that the source of the flashes lies deep in the early cosmos, and that the short radio burst are extremely bright. However, the question of which cosmic event could produce such a bright radio emission in such a short time remained unanswered. The astrophysicists Heino Falcke from Radboud University Nijmegen and Luciano Rezzolla from the Max Planck Institute for Gravitational Physics in Potsdam provide a solution for the riddle. They propose that the radio bursts could be the final farewell greetings of a supramassive rotating neutron star collapsing into a black hole. Spinning star withstands collapse Neutron stars are the ultra-dense remains of a star that has undergone a supernova explosion. They are the size of a small city but have up to two times the mass of our Sun. However, there is an upper limit on how massive neutron stars can become. If they are formed above a critical mass of more than two solar masses, they are expected to collapse immediately into a black hole. -
A Shot in the Dark: the First Image of a Black Hole
A Shot in the Dark: The First etry (VLBI) (visit EHT’s home page for more information[14]). VLBI create a collection of radio Image of a Black Hole wave detections that when pieced together created Written by Priscilla Dohrwardt a ”symphony” of noise (i.e radio waves). The black hole in question is only a mere 55 As Johnny Cash once said, ”I fell into a burning million light years from earth in the Messier 87 ring of fire” and on April 10th, so did the world. galaxy. It is a supermassive black hole, weighing The first ever black hole image graces us with a in at 6.5 billion times the mass of our sun. To put black interior surrounded by what is referred to as that in perspective, the center of the black hole a ring of fire. is about the size of the Milky Way Galaxy. Not only are we all astonished by this mammoth, but even Professor Heino Falcke, the man behind the project, said, ”It is one of the heaviest black holes that we think exists. It is an absolute monster, the heavyweight champion of black holes in the Uni- verse” [15]. The team who captured the iconic black hole image happened to be in a collaborative project between NASA, MIT and various other partnered The first image of a black hole, located in countries within the National Science Foundation. the Messier 87 galaxy was captured by the They used 8 different radio telescopes around the Event Horizon Telescope collaboration. Credits: world to collect an array of information. -
Luciano Rezzolla Institute for Theoretical Physics, Frankfurt Event Horizon Telescope (EHT) Collaboration
The first image of a black hole Luciano Rezzolla Institute for Theoretical Physics, Frankfurt Event Horizon Telescope (EHT) Collaboration Milano 09.10.19 Plan of the talk ✴ The first image of a black hole: M87* ✴ How do you take a picture of a BH: observations? ✴ How do you take a picture of a BH: theory? ✴ Alternatives to Einstein and to black holes M87,The firstcenter image of the of aVirgo black cluster hole How was this accomplished? ESO VLBI: Very Long Baseline Interferometry wavelength resolution = ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯ telescope size wavelength smaller wavelengths (higher frequencies) technology progress (GHz → THz) GRMHD ray- traced simulation EHT angular size •The shorter the wavelength, the smaller the emitting source •At 1.3 mm the source becomes of the size of the horizon mas = milli-arcsecond = 5 ×10-9 rad µas = micro-arcsecond = 5 ×10-12 rad VLBI: Very Long Baseline Interferometry The Event Horizon Telescope IRAM PdB CARMA (NOEMA) Pico Veleta Create a virtual radio telescope the size of SMT the Earth sensitive to SMA mm wavelengths. LMT ALMA SPT 1.3 mm (radio waves) resolution = ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯—————— intercontinental ??? distances Mexico Arizona (LMT) (SMT) Hawaii (SMA/JCMT) South Pole (SPT) Spain Chile (IRAM 30m, (ALMA/APEX) Pico Veleta) The Black Hole Shadow in M 87 Cover Pages The image has soon gone around the world… becoming a great resource for social media… seen from Bologna Elliptical galaxy in center of Virgo cluster 55 Million light years away 9 There is evidence for a central dark mass of 3-6×10 Msun image in the optical Large-scale radio map (few cm wavelengths) 240.000 lightyears small-scale radio map of the core (cm wavelength) Elliptical galaxy in center of Virgo cluster 55 Million light years away 9 There is evidence for a central dark mass of 3-6×10 Msun shadow’s size 240.000 lightyears small-scale radio map of the core (cm wavelength) 3 light years de Gasperin et al. -
Ultimate Precision in Cosmic-Ray Radio Detection - the SKA Tim Huege, Justin D
Ultimate precision in cosmic-ray radio detection - the SKA Tim Huege, Justin D. Bray, Stijn Buitink, David Butler, Richard Dallier, Ron D. Ekers, Torsten Enßlin, Heino Falcke, Andreas Haungs, Clancy W. James, et al. To cite this version: Tim Huege, Justin D. Bray, Stijn Buitink, David Butler, Richard Dallier, et al.. Ultimate precision in cosmic-ray radio detection - the SKA. 7th international workshop on Acoustic and Radio EeV Neutrino Detection Activities, Jun 2016, Groningen, Netherlands. pp.02003, 10.1051/epjconf/201713502003. hal-01584598 HAL Id: hal-01584598 https://hal.archives-ouvertes.fr/hal-01584598 Submitted on 15 Jun 2020 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Ultimate precision in cosmic-ray radio detection — the SKA Tim Huege1;?, Justin D. Bray2, Stijn Buitink3, David Butler4, Richard Dallier5;6, Ron D. Ekers7, Torsten Enßlin8, Heino Falcke9;10, Andreas Haungs1, Clancy W. James11, Lilian Martin5;6, Pra- gati Mitra3, Katharine Mulrey3, Anna Nelles12, Benoît Revenu5, Olaf Scholten13;14, Frank G. Schröder1, Steven Tingay15;16, Tobias Winchen3, and Anne Zilles4 1IKP, Karlsruher Institut für Technologie, Postfach 3640, 76021 Karlsruhe, Germany 2School of Physics & Astronomy, Univ. of Manchester, Manchester M13 9PL, United Kingdom 3Astrophysical Institute, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium 4EKP, Karlsruher Institut für Technologie, Kaiserstr. -
Grailquest: Hunting for Atoms of Space and Time Hidden In
Voyage 2050 - long term plan in the ESA science programme GrailQuest: hunting for Atoms of Space and Time hidden in the wrinkle of Space{Time A swarm of nano/micro/small{satellites to probe the ultimate structure of Space-Time and to provide an all-sky monitor to study high energy astrophysics phenomena Contact Scientist: Luciano Burderi Dipartimento di Fisica, Universit`adegli Studi di Cagliari SP Monserrato-Sestu km 0.7, 09042 Monserrato, Italy Tel.: +39-070-6754854 Fax: +39-070-510171 E-mail: [email protected] 2 Contact Scientist: Luciano Burderi Core Proposing Team: Luciano Burderi Dipartimento di Fisica, Universit`adegli Studi di Cagliari, SP Monserrato-Sestu km 0.7, 09042 Monserrato, Italy Andrea Sanna Dipartimento di Fisica, Universit`adegli Studi di Cagliari, SP Monserrato-Sestu km 0.7, 09042 Monserrato, Italy Tiziana Di Salvo Universit`adegli Studi di Palermo, Dipartimento di Fisica e Chimica, via Archirafi 36, 90123 Palermo, Italy Lorenzo Amati INAF-Osservatorio di Astrofisica e Scienza dello Spazio di Bologna, Via Piero Gobetti 93/3, I-40129 Bologna, Italy Giovanni Amelino-Camelia Dipartimento di Fisica Ettore Pancini, Universit`adi Napoli \Federico II", and INFN, Sezione di Napoli, Complesso Univ. Monte S. Angelo, I-80126 Napoli, Italy Marica Branchesi Gran Sasso Science Institute, I-67100 L`Aquila, Italy Salvatore Capozziello Dipartimento di Fisica, Universit`adi Napoli \Federico II", Complesso Universitario di Monte SantAngelo, Via Cinthia, 21, I-80126 Napoli, Italy Eugenio Coccia Gran Sasso Science Institute, I-67100 L`Aquila, Italy Monica Colpi Dipartimento di Fisica \G. Occhialini", Universit`adegli Studi Milano - Bicocca, Piazza della Scienza 3, Milano, Italy Enrico Costa INAF-IAPS,Via del Fosso del Cavaliere 100, I-00133 Rome, Italy Paolo De Bernardis Physics Department, Universit`adi Roma La Sapienza, Ple.