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Kaluza-Klein Gravity, Concentrating on the General Rel- Ativity, Rather Than Particle Physics Side of the Subject
Kaluza-Klein Gravity J. M. Overduin Department of Physics and Astronomy, University of Victoria, P.O. Box 3055, Victoria, British Columbia, Canada, V8W 3P6 and P. S. Wesson Department of Physics, University of Waterloo, Ontario, Canada N2L 3G1 and Gravity Probe-B, Hansen Physics Laboratories, Stanford University, Stanford, California, U.S.A. 94305 Abstract We review higher-dimensional unified theories from the general relativity, rather than the particle physics side. Three distinct approaches to the subject are identi- fied and contrasted: compactified, projective and noncompactified. We discuss the cosmological and astrophysical implications of extra dimensions, and conclude that none of the three approaches can be ruled out on observational grounds at the present time. arXiv:gr-qc/9805018v1 7 May 1998 Preprint submitted to Elsevier Preprint 3 February 2008 1 Introduction Kaluza’s [1] achievement was to show that five-dimensional general relativity contains both Einstein’s four-dimensional theory of gravity and Maxwell’s the- ory of electromagnetism. He however imposed a somewhat artificial restriction (the cylinder condition) on the coordinates, essentially barring the fifth one a priori from making a direct appearance in the laws of physics. Klein’s [2] con- tribution was to make this restriction less artificial by suggesting a plausible physical basis for it in compactification of the fifth dimension. This idea was enthusiastically received by unified-field theorists, and when the time came to include the strong and weak forces by extending Kaluza’s mechanism to higher dimensions, it was assumed that these too would be compact. This line of thinking has led through eleven-dimensional supergravity theories in the 1980s to the current favorite contenders for a possible “theory of everything,” ten-dimensional superstrings. -
What Is Gravity Probe B? a Quest for Experimental Truth the GP-B Flight
What is Gravity Probe B? than Gravity Probe B. It’s just a star, a telescope, and a spinning sphere.” However, it took the exceptional collaboration of Stanford, Gravity Probe B (GP-B) is a NASA physics mission to experimentally MSFC, Lockheed Martin and a host of others more than four decades investigate Einstein’s 1916 general theory of relativity—his theory of gravity. to develop the ultra-precise gyroscopes and the other cutting- GP-B uses four spherical gyroscopes and a telescope, housed in a satellite edge technologies necessary to carry out this “simple” experiment. orbiting 642 km (400 mi) above the Earth, to measure, with unprecedented accuracy, two extraordinary effects predicted by the general theory of rela- The GP-B Flight Mission & Data Analysis tivity: 1) the geodetic effect—the amount by which the Earth warps the local spacetime in which it resides; and 2) the frame-dragging effect—the amount On April 20, 2004 at 9:57:24 AM PDT, a crowd of over 2,000 current and by which the rotating Earth drags its local spacetime around with it. GP-B former GP-B team members and supporters watched and cheered as the tests these two effects by precisely measuring the precession (displacement) GP-B spacecraft lifted off from Vandenberg Air Force Base. That emotionally angles of the spin axes of the four gyros over the course of a year and com- overwhelming day, culminating with the extraordinary live video of paring these experimental results with predictions from Einstein’s theory. the spacecraft separating from the second stage booster meant, as GP-B Program Manager Gaylord Green put it, “that 10,000 things went right.” A Quest for Experimental Truth Once in orbit, the spacecraft first underwent a four-month Initialization The idea of testing general relativity with orbiting gyroscopes was sug- and Orbit Checkout (IOC), in which all systems and instruments were gested independently by two physicists, George Pugh and Leonard Schiff, initialized, tested, and optimized for the data collection to follow. -
SEER for Hardware's Cost Model for Future Orbital Concepts (“FAR OUT”)
Presented at the 2008 SCEA-ISPA Joint Annual Conference and Training Workshop - www.iceaaonline.com SEER for Hardware’s Cost Model for Future Orbital Concepts (“FAR OUT”) Lee Fischman ISPA/SCEA Industry Hills 2008 Presented at the 2008 SCEA-ISPA Joint Annual Conference and Training Workshop - www.iceaaonline.com Introduction A model for predicting the cost of long term unmanned orbital spacecraft (Far Out) has been developed at the request of AFRL. Far Out has been integrated into SEER for Hardware. This presentation discusses the Far Out project and resulting model. © 2008 Galorath Incorporated Presented at the 2008 SCEA-ISPA Joint Annual Conference and Training Workshop - www.iceaaonline.com Goals • Estimate space satellites in any earth orbit. Deep space exploration missions may be considered as data is available, or may be an area for further research in Phase 3. • Estimate concepts to be launched 10-20 years into the future. • Cost missions ranging from exploratory to strategic, with a specific range decided based on estimating reliability. The most reliable estimates are likely to be in the middle of this range. • Estimates will include hardware, software, systems engineering, and production. • Handle either government or commercial missions, either “one-of-a-kind” or constellations. • Be used in a “top-down” manner using relatively less specific mission resumes, similar to those available from sources such as the Earth Observation Portal or Janes Space Directory. © 2008 Galorath Incorporated Presented at the 2008 SCEA-ISPA Joint Annual Conference and Training Workshop - www.iceaaonline.com Challenge: Technology Change Over Time Evolution in bus technologies Evolution in payload technologies and performance 1. -
SIGINT: the Mission Cubesats Are Made for a Small Country’S Perspective
Naval Research Laboratory 22 June 1960 SIGINT: The Mission CubeSats are Made For A Small Country’s Perspective 32nd Annual AIAA/USU Conference on Small Satellites 1 ISIS - Innovative Solutions In Space Vertically Integrated Small Satellite Company SATELLITE CUBESAT LAUNCH SERVICES R&D SERVICES SOLUTIONS PRODUCTS 2 SIGINT – ELINT – Spectrum Monitoring SIGINT SpectrumCOMINT Monitoring ELINT FISINT/TELINT TECHNICAL OPERATIONAL • Discover new systems • Location • Details about emissions • Schedule • Performance estimation • Movement • ECM development • Warning 3 Spectrum Monitoring Causes of Interference Source: Eutelsat briefing to the ITU (2013) 4 Miniturization 5 ELINT: Single-Satellite Solution Lotos-S/Pion-NKS 8 - 12 m Images courtesy of RussianSpaceWeb 6 ELINT: Direction Finding Direction of Arrival/Angle of Arrival 7 Fundamental Limits Why the Shrink-Ray Won’t Work Size has effect on direction finding accuracy because of: • Antenna gain (i.e. SNR) • Number of array elements that can be placed • Array element spacing A 6U-face of CubeSat offers very limited real estate Images courtesy of NASA 8 BRIK-II Royal Netherlannds Air Force 9 ELINT: Multi-Satellite Solution Naval Ocean Surveillance System Picture by John C. Murphy 10 Capacité de Renseignement Electromagnétique Spatiale (CERES) 781 M€ Essaim 216 M€ 2004 Elisa 115 M€ 2007 2009 2011 CERES 450 M€ 2013 2015 2020 Images courtesy of CNES 11 Miniturization through Distribution Opening Up The Trade Space Number of satellites in orbit Image courtesy of the Science and Technology Policy Institute 12 Radio Astronomy An Intransparent Affair 13 Orbiting Low Frequency Antennas for Radio Astronomy < 100 km > 50 satellites = 0.006° (30 MHz) 14 Maturing CubeSats for ELINT/Spectrum Monitoring & Astronomy Development Areas Station-Keeping ISL & Synchronization 2-100 Satellites Relative Position Knowledge From A. -
Space in Central and Eastern Europe
EU 4+ SPACE IN CENTRAL AND EASTERN EUROPE OPPORTUNITIES AND CHALLENGES FOR THE EUROPEAN SPACE ENDEAVOUR Report 5, September 2007 Charlotte Mathieu, ESPI European Space Policy Institute Report 5, September 2007 1 Short Title: ESPI Report 5, September 2007 Editor, Publisher: ESPI European Space Policy Institute A-1030 Vienna, Schwarzenbergplatz 6 Austria http://www.espi.or.at Tel.: +43 1 718 11 18 - 0 Fax - 99 Copyright: ESPI, September 2007 This report was funded, in part, through a contract with the EUROPEAN SPACE AGENCY (ESA). Rights reserved - No part of this report may be reproduced or transmitted in any form or for any purpose without permission from ESPI. Citations and extracts to be published by other means are subject to mentioning “source: ESPI Report 5, September 2007. All rights reserved” and sample transmission to ESPI before publishing. Price: 11,00 EUR Printed by ESA/ESTEC Compilation, Layout and Design: M. A. Jakob/ESPI and Panthera.cc Report 5, September 2007 2 EU 4+ Executive Summary ....................................................................................... 5 Introduction…………………………………………………………………………………………7 Part I - The New EU Member States Introduction................................................................................................... 9 1. What is really at stake for Europe? ....................................................... 10 1.1. The European space community could benefit from a further cooperation with the ECS ................................................................. 10 1.2. However, their economic weight remains small in the European landscape and they still suffer from organisatorial and funding issues .... 11 1.2.1. Economic weight of the ECS in Europe ........................................... 11 1.2.2. Reality of their impact on competition ............................................ 11 1.2.3. Foreign policy issues ................................................................... 12 1.2.4. Internal challenges ..................................................................... 12 1.3. -
Highlights in Space 2010
International Astronautical Federation Committee on Space Research International Institute of Space Law 94 bis, Avenue de Suffren c/o CNES 94 bis, Avenue de Suffren UNITED NATIONS 75015 Paris, France 2 place Maurice Quentin 75015 Paris, France Tel: +33 1 45 67 42 60 Fax: +33 1 42 73 21 20 Tel. + 33 1 44 76 75 10 E-mail: : [email protected] E-mail: [email protected] Fax. + 33 1 44 76 74 37 URL: www.iislweb.com OFFICE FOR OUTER SPACE AFFAIRS URL: www.iafastro.com E-mail: [email protected] URL : http://cosparhq.cnes.fr Highlights in Space 2010 Prepared in cooperation with the International Astronautical Federation, the Committee on Space Research and the International Institute of Space Law The United Nations Office for Outer Space Affairs is responsible for promoting international cooperation in the peaceful uses of outer space and assisting developing countries in using space science and technology. United Nations Office for Outer Space Affairs P. O. Box 500, 1400 Vienna, Austria Tel: (+43-1) 26060-4950 Fax: (+43-1) 26060-5830 E-mail: [email protected] URL: www.unoosa.org United Nations publication Printed in Austria USD 15 Sales No. E.11.I.3 ISBN 978-92-1-101236-1 ST/SPACE/57 *1180239* V.11-80239—January 2011—775 UNITED NATIONS OFFICE FOR OUTER SPACE AFFAIRS UNITED NATIONS OFFICE AT VIENNA Highlights in Space 2010 Prepared in cooperation with the International Astronautical Federation, the Committee on Space Research and the International Institute of Space Law Progress in space science, technology and applications, international cooperation and space law UNITED NATIONS New York, 2011 UniTEd NationS PUblication Sales no. -
Space Debris
IADC-11-04 April 2013 Space Debris IADC Assessment Report for 2010 Issued by the IADC Steering Group Table of Contents 1. Foreword .......................................................................... 1 2. IADC Highlights ................................................................ 2 3. Space Debris Activities in the United Nations ................... 4 4. Earth Satellite Population .................................................. 6 5. Satellite Launches, Reentries and Retirements ................ 10 6. Satellite Fragmentations ................................................... 15 7. Collision Avoidance .......................................................... 17 8. Orbital Debris Removal ..................................................... 18 9. Major Meetings Addressing Space Debris ........................ 20 Appendix: Satellite Break-ups, 2000-2010 ............................ 22 IADC Assessment Report for 2010 i Acronyms ADR Active Debris Removal ASI Italian Space Agency CNES Centre National d’Etudes Spatiales (France) CNSA China National Space Agency CSA Canadian Space Agency COPUOS Committee on the Peaceful Uses of Outer Space, United Nations DLR German Aerospace Center ESA European Space Agency GEO Geosynchronous Orbit region (region near 35,786 km altitude where the orbital period of a satellite matches that of the rotation rate of the Earth) IADC Inter-Agency Space Debris Coordination Committee ISRO Indian Space Research Organization ISS International Space Station JAXA Japan Aerospace Exploration Agency LEO Low -
A Tale of Two Spaceports Telemedicine SATCOM Testing Forrester's Focus a Chat with Mike Antonovich Middle East Connections
Worldwide Satellite Magazine May 2011 SatMagazine A Tale Of Two Spaceports Telemedicine SATCOM Testing Forrester’s Focus A Chat With Mike Antonovich Middle East Connections A Case In Point x2 SatMagazine Vol. 4, No. 3 — May 2011 Silvano Payne, Publisher + Author Hartley G. Lesser, Editorial Director Pattie Waldt, Editor Jill Durfee, Sales Director, Editorial Assistant Donald McGee, Production Manager Simon Payne, Development Manager Chris Forrester, Associate Editor Richard Dutchik, Contributing Editor Michael Fleck, Contributing Editor Alan Gottlieb, Contributing Editor Dan Makinster, Technical Advisor Authors Chris Forrester Beate Hoehne Hartley Lesser Pattie Waldt Published monthly by Satnews Publishers 800 Siesta Way Sonoma, CA 95476 USA Phone: (707) 939-9306 Fax: (707) 838-9235 © 2011 Satnews Publishers We reserve the right to edit all submitted materials to meet our content guidelines, as well as for grammar and spelling consistency. Articles may be moved to an alternative issue to accommodate publication space requirements or removed due to space restrictions. Submission of content does not constitute acceptance of said material by SatNews Publishers. Edited materials may, or may not, be returned to author and/or company for review prior to publication. The views expressed in our various publications do not necessarily reflect the views or opinions of SatNews Publishers. All included imagery is courtesy of, and copyright to, the respective companies. 3 SatMagazine — May 2011 SatMagazine — May 2011 — Payload InfoBeam 08 Focus 36 -
Mission Model (Aggregate)
Mission Models (Graphical Depiction) IOAG-14, Nov. 2-4, 2010 Update/s after IOAG-14 Meeting: (1) IOAG Secretariat / 2011-Jan.-14: Incorporated 2010-12-15 ESA update Earth Missions (1) 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 COSMO –SM1 COSMO –SM2 ASI COSMO –SM3 COSMO –SM4 AGI MIOSAT PRISMA SPOT HELIOS 2010 TELECOM-2 Legend Green – In operation JASON Light green – Potential extension Blue – In development DEMETER TARANIS Light Blue – Potential extension Yellow – Proposed ESSAIM MICROSCOPE Light Yellow – Proposed extension CNES PARASOL MERLIN Note: Color fade to white indicates End Date unknown CALIPSO COROT CERES SMOS CSO-MUSIS (terminate 2028, potentially extend to 2030) PICARD MICROCARB (*) No dates provided Earth Missions (2) 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 BIR DEOS Legend Green – In operation GR1/ GR2 ENMAP Light green – Potential extension Blue – In development SB1/SB2 Light Blue – Potential extension Yellow – Proposed DLR TerraSAR-X H2SAT* Light Yellow – Proposed extension TET Asteroiden Finder* Note: Color fade to white indicates End Date unknown TanDEM-X PRISMA 2010 (*) No dates provided Earth Missions (3) 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 ERS 2 ADM-AEOLUS ENVISAT Sentinel 1B Extends to Oct. 2026 CRYOSAT 2 Sentinel 2B Extends to Jun. 2027 GOCE Earth Case Swarm Sentinel 1A Sentinel 2A Sentinel 3A ESA 2010 Sentinel 3B Extends to Aug. 2027 MSG MSG METOP METOP ARTEMIS GALILEO Legend Green – In operation -
A B 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
A B 1 Name of Satellite, Alternate Names Country of Operator/Owner 2 AcrimSat (Active Cavity Radiometer Irradiance Monitor) USA 3 Afristar USA 4 Agila 2 (Mabuhay 1) Philippines 5 Akebono (EXOS-D) Japan 6 ALOS (Advanced Land Observing Satellite; Daichi) Japan 7 Alsat-1 Algeria 8 Amazonas Brazil 9 AMC-1 (Americom 1, GE-1) USA 10 AMC-10 (Americom-10, GE 10) USA 11 AMC-11 (Americom-11, GE 11) USA 12 AMC-12 (Americom 12, Worldsat 2) USA 13 AMC-15 (Americom-15) USA 14 AMC-16 (Americom-16) USA 15 AMC-18 (Americom 18) USA 16 AMC-2 (Americom 2, GE-2) USA 17 AMC-23 (Worldsat 3) USA 18 AMC-3 (Americom 3, GE-3) USA 19 AMC-4 (Americom-4, GE-4) USA 20 AMC-5 (Americom-5, GE-5) USA 21 AMC-6 (Americom-6, GE-6) USA 22 AMC-7 (Americom-7, GE-7) USA 23 AMC-8 (Americom-8, GE-8, Aurora 3) USA 24 AMC-9 (Americom 9) USA 25 Amos 1 Israel 26 Amos 2 Israel 27 Amsat-Echo (Oscar 51, AO-51) USA 28 Amsat-Oscar 7 (AO-7) USA 29 Anik F1 Canada 30 Anik F1R Canada 31 Anik F2 Canada 32 Apstar 1 China (PR) 33 Apstar 1A (Apstar 3) China (PR) 34 Apstar 2R (Telstar 10) China (PR) 35 Apstar 6 China (PR) C D 1 Operator/Owner Users 2 NASA Goddard Space Flight Center, Jet Propulsion Laboratory Government 3 WorldSpace Corp. Commercial 4 Mabuhay Philippines Satellite Corp. Commercial 5 Institute of Space and Aeronautical Science, University of Tokyo Civilian Research 6 Earth Observation Research and Application Center/JAXA Japan 7 Centre National des Techniques Spatiales (CNTS) Government 8 Hispamar (subsidiary of Hispasat - Spain) Commercial 9 SES Americom (SES Global) Commercial -
Classification of Geosynchronous Objects
esoc European Space Operations Centre Robert-Bosch-Strasse 5 D-64293 Darmstadt Germany T +49 (0)6151 900 www.esa.int CLASSIFICATION OF GEOSYNCHRONOUS OBJECTS Produced with the DISCOS Database Prepared by T. Flohrer & S. Frey Reference GEN-DB-LOG-00195-OPS-GR Issue 18 Revision 0 Date of Issue 3 June 2016 Status ISSUED Document Type TN European Space Agency Agence spatiale europeenne´ Abstract This is a status report on geosynchronous objects as of 1 January 2016. Based on orbital data in ESA’s DISCOS database and on orbital data provided by KIAM the situation near the geostationary ring is analysed. From 1434 objects for which orbital data are available (of which 2 are outdated, i.e. the last available state dates back to 180 or more days before the reference date), 471 are actively controlled, 747 are drifting above, below or through GEO, 190 are in a libration orbit and 15 are in a highly inclined orbit. For 11 objects the status could not be determined. Furthermore, there are 50 uncontrolled objects without orbital data (of which 44 have not been cata- logued). Thus the total number of known objects in the geostationary region is 1484. In issue 18 the previously used definition of ”near the geostationary ring” has been slightly adapted. If you detect any error or if you have any comment or question please contact: Tim Flohrer, PhD European Space Agency European Space Operations Center Space Debris Office (OPS-GR) Robert-Bosch-Str. 5 64293 Darmstadt, Germany Tel.: +49-6151-903058 E-mail: tim.fl[email protected] Page 1 / 178 European Space Agency CLASSIFICATION OF GEOSYNCHRONOUS OBJECTS Agence spatiale europeenne´ Date 3 June 2016 Issue 18 Rev 0 Table of contents 1 Introduction 3 2 Sources 4 2.1 USSTRATCOM Two-Line Elements (TLEs) . -
Echostar Pursues a Strategy Shift Muda, and Luxembourg's SES Global SA
MU"~ d.? ;)D()(Pp B;;l THE WALL STREET JOURNAL. TECHNOLOGY EchoStar Pursues a Strategy Shift muda, and Luxembourg'S SES Global SA. Brothers Holdings Inc. But if the appetite Cost -Conscious CEO Ergen So far, EchoStar has primarily built for such conteni fails to take off, Mr. Jay satellites to serve its more than 12 mil ant said, EchoStar "has looked at the cost To Boost Satellite Spending, lion subscribers, and it previously signed benefit analysis" and decided "it also can up to use additional capacity on other become a satellite player" in the wholesale May Lease Extra Capacity satellites operated by SES Global's U_S. arena. unit. But with tts new strategy calling for While other analysts predict Echo· By ANDY PASZTOR a total of at least another nine wholly Star's internal needs will absorb nearly owned or leased satellites supporting its all tile extra capacity, Jimmy Schaeffler, EchoStar Communications Corp. is expansion program into the next decade, an industry consultant With Carmel pursuing a new strategy that envisions EchoStar would have greater fleXibility Group, said the EchoStar filing reveals investing more than $1.6 billion to dra "the beginning of a major shift in strat matically increase its satellite fleet over egy." Mr. Ergen has decided "he can be a tile next few years, witil plans to poten middleman in·· wholesaling incremental tially lease some of the extra capacity to EchoStar would have ;::,a~acity :lnd stm d.o \~juite well." other companies. The spending plan laid out in Echo The Englewood, Colo., broadcaster, more flexibility to move Star's filing projects roughly $500 million which is best known for operating the more in satellite-related obligations Dish television service in the U.S., also outside its satellite-to through tile end of the decade than the disclosed in a recent regulatory filing that total included in a year·earlier filing.