Robert Dicke and the Naissance of Experimental Gravity Physics
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Tests of General Relativity - Wikipedia
12/2/2018 Tests of general relativity - Wikipedia Tests of general relativity T ests of general relativity serve to establish observational evidence for the theory of general relativity. The first three tests, proposed by Einstein in 1915, concerned the "anomalous" precession of the perihelion of Mercury, the bending of light in gravitational fields, and the gravitational redshift. The precession of Mercury was already known; experiments showing light bending in line with the predictions of general relativity was found in 1919, with increasing precision measurements done in subsequent tests, and astrophysical measurement of the gravitational redshift was claimed to be measured in 1925, although measurements sensitive enough to actually confirm the theory were not done until 1954. A program of more accurate tests starting in 1959 tested the various predictions of general relativity with a further degree of accuracy in the weak gravitational field limit, severely limiting possible deviations from the theory. In the 197 0s, additional tests began to be made, starting with Irwin Shapiro's measurement of the relativistic time delay in radar signal travel time near the sun. Beginning in 197 4, Hulse, Taylor and others have studied the behaviour of binary pulsars experiencing much stronger gravitational fields than those found in the Solar System. Both in the weak field limit (as in the Solar System) and with the stronger fields present in systems of binary pulsars the predictions of general relativity have been extremely well tested locally. In February 2016, the Advanced LIGO team announced that they had directly detected gravitational waves from a black hole merger.[1] This discovery, along with additional detections announced in June 2016 and June 2017 ,[2] tested general relativity in the very strong field limit, observing to date no deviations from theory. -
July 2007 (Volume 16, Number 7) Entire Issue
July 2007 Volume 16, No. 7 www.aps.org/publications/apsnews APS NEWS Election Preview A PUBLICATION OF THE AMERICAN PHYSICAL SOCIETY • WWW.apS.ORG/PUBLICATIONS/apSNEWS Pages 6-7 Executive Board Resolution Thanks US physics team trains for competition in Iran By Katherine McAlpine Legislators for Support of Science Twenty-four high school stu- The APS Executive Board bill authorizes nearly $60 billion dents comprising the US Phys- has passed a resolution thanking for various programs for FY 2008 ics Olympiad team vied for five House and Senate policy makers through FY 2011. The bill would places on the traveling team at for recently-passed legislation double the NSF budget over five the University of Maryland from that strengthens the science, math years and double the DOE Office May 22nd to June 1st. Those and engineering activities of our of Science budget over 10 years. chosen to travel will compete nation. The House of Representatives this month against teams from “Sustaining and improving the passed five separate authorization all over the world at Isfahan standard of living of American bills, which were then combined University of Technology in Is- citizens, achieving energy security into one bill, H.R. 2272, the 21st fahan, Iran. and environmental sustainability, Century Competitiveness Act of Over 3,100 US Physics Team providing the jobs of tomorrow 2007. The bill would put the NSF hopefuls took the preliminary and defending our nation against budget and the NIST Scientific examination in January, and 200 aggressors all require federal in- and Technical Research and Ser- were given a second exam in vestments in science education vices budget on track to double in March to determine the top 24 and research… The Board con- 10 years. -
National Academy of Sciences July 1, 1979 Officers
NATIONAL ACADEMY OF SCIENCES JULY 1, 1979 OFFICERS Term expires President-PHILIP HANDLER June 30, 1981 Vice-President-SAUNDERS MAC LANE June 30, 1981 Home Secretary-BRYCE CRAWFORD,JR. June 30, 1983 Foreign Secretary-THOMAS F. MALONE June 30, 1982 Treasurer-E. R. PIORE June 30, 1980 Executive Officer Comptroller Robert M. White David Williams COUNCIL Abelson, Philip H. (1981) Markert,C. L. (1980) Berg, Paul (1982) Nierenberg,William A. (1982) Berliner, Robert W. (1981) Piore, E. R. (1980) Bing, R. H. (1980) Ranney, H. M. (1980) Crawford,Bryce, Jr. (1983) Simon, Herbert A. (1981) Friedman, Herbert (1982) Solow, R. M. (1980) Handler, Philip (1981) Thomas, Lewis (1982) Mac Lane, Saunders (1981) Townes, Charles H. (1981) Malone, Thomas F. (1982) Downloaded by guest on September 30, 2021 SECTIONS The Academyis divided into the followingSections, to which membersare assigned at their own choice: (11) Mathematics (31) Engineering (12) Astronomy (32) Applied Biology (13) Physics (33) Applied Physical and (14) Chemistry Mathematical Sciences (15) Geology (41) Medical Genetics Hema- (16) Geophysics tology, and Oncology (21) Biochemistry (42) Medical Physiology, En- (22) Cellularand Develop- docrinology,and Me- mental Biology tabolism (23) Physiological and Phar- (43) Medical Microbiology macologicalSciences and Immunology (24) Neurobiology (51) Anthropology (25) Botany (52) Psychology (26) Genetics (53) Social and Political Sci- (27) Population Biology, Evo- ences lution, and Ecology (54) Economic Sciences In the alphabetical list of members,the numbersin parentheses, followingyear of election, indicate the respective Class and Section of the member. CLASSES The members of Sections are grouped in the following Classes: I. Physical and Mathematical Sciences (Sections 11, 12, 13, 14, 15, 16). -
Variable Planck's Constant
Variable Planck’s Constant: Treated As A Dynamical Field And Path Integral Rand Dannenberg Ventura College, Physics and Astronomy Department, Ventura CA [email protected] [email protected] January 28, 2021 Abstract. The constant ħ is elevated to a dynamical field, coupling to other fields, and itself, through the Lagrangian density derivative terms. The spatial and temporal dependence of ħ falls directly out of the field equations themselves. Three solutions are found: a free field with a tadpole term; a standing-wave non-propagating mode; a non-oscillating non-propagating mode. The first two could be quantized. The third corresponds to a zero-momentum classical field that naturally decays spatially to a constant with no ad-hoc terms added to the Lagrangian. An attempt is made to calibrate the constants in the third solution based on experimental data. The three fields are referred to as actons. It is tentatively concluded that the acton origin coincides with a massive body, or point of infinite density, though is not mass dependent. An expression for the positional dependence of Planck’s constant is derived from a field theory in this work that matches in functional form that of one derived from considerations of Local Position Invariance violation in GR in another paper by this author. Astrophysical and Cosmological interpretations are provided. A derivation is shown for how the integrand in the path integral exponent becomes Lc/ħ(r), where Lc is the classical action. The path that makes stationary the integral in the exponent is termed the “dominant” path, and deviates from the classical path systematically due to the position dependence of ħ. -
The Struggle for Quantum Theory 47 5.1Aliensignals
Fundamental Forces of Nature The Story of Gauge Fields This page intentionally left blank Fundamental Forces of Nature The Story of Gauge Fields Kerson Huang Massachusetts Institute of Technology, USA World Scientific N E W J E R S E Y • L O N D O N • S I N G A P O R E • B E I J I N G • S H A N G H A I • H O N G K O N G • TA I P E I • C H E N N A I Published by World Scientific Publishing Co. Pte. Ltd. 5 Toh Tuck Link, Singapore 596224 USA office: 27 Warren Street, Suite 401-402, Hackensack, NJ 07601 UK office: 57 Shelton Street, Covent Garden, London WC2H 9HE British Library Cataloguing-in-Publication Data A catalogue record for this book is available from the British Library. FUNDAMENTAL FORCES OF NATURE The Story of Gauge Fields Copyright © 2007 by World Scientific Publishing Co. Pte. Ltd. All rights reserved. This book, or parts thereof, may not be reproduced in any form or by any means, electronic or mechanical, including photocopying, recording or any information storage and retrieval system now known or to be invented, without written permission from the Publisher. For photocopying of material in this volume, please pay a copying fee through the Copyright Clearance Center, Inc., 222 Rosewood Drive, Danvers, MA 01923, USA. In this case permission to photocopy is not required from the publisher. ISBN-13 978-981-270-644-7 ISBN-10 981-270-644-5 ISBN-13 978-981-270-645-4 (pbk) ISBN-10 981-270-645-3 (pbk) Printed in Singapore. -
Variable Planck's Constant
Preprints (www.preprints.org) | NOT PEER-REVIEWED | Posted: 29 January 2021 doi:10.20944/preprints202101.0612.v1 Variable Planck’s Constant: Treated As A Dynamical Field And Path Integral Rand Dannenberg Ventura College, Physics and Astronomy Department, Ventura CA [email protected] Abstract. The constant ħ is elevated to a dynamical field, coupling to other fields, and itself, through the Lagrangian density derivative terms. The spatial and temporal dependence of ħ falls directly out of the field equations themselves. Three solutions are found: a free field with a tadpole term; a standing-wave non-propagating mode; a non-oscillating non-propagating mode. The first two could be quantized. The third corresponds to a zero-momentum classical field that naturally decays spatially to a constant with no ad-hoc terms added to the Lagrangian. An attempt is made to calibrate the constants in the third solution based on experimental data. The three fields are referred to as actons. It is tentatively concluded that the acton origin coincides with a massive body, or point of infinite density, though is not mass dependent. An expression for the positional dependence of Planck’s constant is derived from a field theory in this work that matches in functional form that of one derived from considerations of Local Position Invariance violation in GR in another paper by this author. Astrophysical and Cosmological interpretations are provided. A derivation is shown for how the integrand in the path integral exponent becomes Lc/ħ(r), where Lc is the classical action. The path that makes stationary the integral in the exponent is termed the “dominant” path, and deviates from the classical path systematically due to the position dependence of ħ. -
Conformational Transition in Immunoglobulin MOPC 460" by Correction. in Themembership List of the National Academy of Scien
Corrections Proc. Natl. Acad. Sci. USA 74 (1977) 1301 Correction. In the article "Kinetic evidence for hapten-induced Correction. In the membership list of the National Academy conformational transition in immunoglobulin MOPC 460" by of Sciences that appeared in the October 1976 issue of Proc. D. Lancet and I. Pecht, which appeared in the October 1976 Natl. Acad. Sci. USA 73,3750-3781, please note the following issue of Proc. Nati. Acad. Sci. USA 73,3549-3553, the authors corrections: H. E. Carter, Britton Chance, Seymour S. Cohen, have requested the following changes. On p. 3550, right-hand E. A. Doisy, Gerald M. Edelman, and John T. Edsall are affil- column, second line from bottom, and p. 3551, left-hand col- iated with the Section ofBiochemistry (21), not the Section of umn, fourth line from the top, "Fig. 2" should be "Fig. 1A." Botany (25). In the legend of Table 2, third line, note (f) should read "AG, = -RTlnKj." On p. 3553, left-hand column, third paragraph, fifth line, "ko" should be replaced by "Ko." Correction. In the Author Index to Volume 73, January-De- cember 1976, which appeared in the December 1976 issue of Proc. Natl. Acad. Sci. USA 73, 4781-4788, the limitations of Correction. In the article "Amino-terminal sequences of two computer alphabetization resulted in the listing of one person polypeptides from human serum with nonsuppressible insu- as the author of another's paper. On p. 4786, it should indicate lin-like and cell-growth-promoting activities: Evidence for that James Christopher Phillips had an article beginning on p. -
The People Who Invented the Internet Source: Wikipedia's History of the Internet
The People Who Invented the Internet Source: Wikipedia's History of the Internet PDF generated using the open source mwlib toolkit. See http://code.pediapress.com/ for more information. PDF generated at: Sat, 22 Sep 2012 02:49:54 UTC Contents Articles History of the Internet 1 Barry Appelman 26 Paul Baran 28 Vint Cerf 33 Danny Cohen (engineer) 41 David D. Clark 44 Steve Crocker 45 Donald Davies 47 Douglas Engelbart 49 Charles M. Herzfeld 56 Internet Engineering Task Force 58 Bob Kahn 61 Peter T. Kirstein 65 Leonard Kleinrock 66 John Klensin 70 J. C. R. Licklider 71 Jon Postel 77 Louis Pouzin 80 Lawrence Roberts (scientist) 81 John Romkey 84 Ivan Sutherland 85 Robert Taylor (computer scientist) 89 Ray Tomlinson 92 Oleg Vishnepolsky 94 Phil Zimmermann 96 References Article Sources and Contributors 99 Image Sources, Licenses and Contributors 102 Article Licenses License 103 History of the Internet 1 History of the Internet The history of the Internet began with the development of electronic computers in the 1950s. This began with point-to-point communication between mainframe computers and terminals, expanded to point-to-point connections between computers and then early research into packet switching. Packet switched networks such as ARPANET, Mark I at NPL in the UK, CYCLADES, Merit Network, Tymnet, and Telenet, were developed in the late 1960s and early 1970s using a variety of protocols. The ARPANET in particular led to the development of protocols for internetworking, where multiple separate networks could be joined together into a network of networks. In 1982 the Internet Protocol Suite (TCP/IP) was standardized and the concept of a world-wide network of fully interconnected TCP/IP networks called the Internet was introduced. -
Advanced Information on the Nobel Prize in Physics, 5 October 2004
Advanced information on the Nobel Prize in Physics, 5 October 2004 Information Department, P.O. Box 50005, SE-104 05 Stockholm, Sweden Phone: +46 8 673 95 00, Fax: +46 8 15 56 70, E-mail: [email protected], Website: www.kva.se Asymptotic Freedom and Quantum ChromoDynamics: the Key to the Understanding of the Strong Nuclear Forces The Basic Forces in Nature We know of two fundamental forces on the macroscopic scale that we experience in daily life: the gravitational force that binds our solar system together and keeps us on earth, and the electromagnetic force between electrically charged objects. Both are mediated over a distance and the force is proportional to the inverse square of the distance between the objects. Isaac Newton described the gravitational force in his Principia in 1687, and in 1915 Albert Einstein (Nobel Prize, 1921 for the photoelectric effect) presented his General Theory of Relativity for the gravitational force, which generalized Newton’s theory. Einstein’s theory is perhaps the greatest achievement in the history of science and the most celebrated one. The laws for the electromagnetic force were formulated by James Clark Maxwell in 1873, also a great leap forward in human endeavour. With the advent of quantum mechanics in the first decades of the 20th century it was realized that the electromagnetic field, including light, is quantized and can be seen as a stream of particles, photons. In this picture, the electromagnetic force can be thought of as a bombardment of photons, as when one object is thrown to another to transmit a force. -
Annotating a Text
HUNTER COLLEGE READING/WRITING CENTER THE WRITING PROCESS Invention: Annotating a Text Annotating a text, or marking the pages with notes, is an excellent, if not essential, way to make the most out of the reading you do for college courses. Annotations make it easy to find important information quickly when you look back and review a text. They help you familiarize yourself with both the content and organization of what you read. They provide a way to begin engaging ideas and issues directly through comments, questions, associations, or other reactions that occur to you as you read. In all these ways, annotating a text makes the reading process an active one, not just background for writing assignments, but an integral first step in the writing process. A well-annotated text will accomplish all of the following: •clearly identify where in the text important ideas and information are located •express the main ideas of a text •trace the development of ideas/arguments throughout a text •introduce a few of the reader’s thoughts and reactions Ideally, you should read a text through once before making major annotations. You may just want to circle unfamiliar vocabulary or concepts. This way, you will have a clearer idea about where major ideas and important information are in the text, and your annotating will be more efficient. A brief description and discussion of four ways of annotating a text and a sample annotated text follow: !Highlighting/Underlining Highlighting or underlining key words and phrases or major ideas is the most common form of annotating texts. -
Edward B. Van Vleck 1863‐1943
Remembering Van: Three Madison families and other tales “Van had many enthusiasms and loyalties, but none exceeded those he felt for the University of Wisconsin and its home, Madison.” 1 Charles Van Hise Born in 1857, Charles Van Hise was a distinguished geologist who had been elected to the National Academy of Sciences in 1902. In 1903, he was named President of the University of Wisconsin 2 In 1904, Van Hise recruited Charles Russell Bardeen, a member of the first class to graduate of the Johns Hopkins Medical School, to found a medical school at the University of Wisconsin John Bardeen is at the right hand end. His grandfather, Charles W Bardeen, is second from the left. 3 Charles Sumner Slichter 1864-1946 In 1906, Van Hise appointed Charles S. Slichter head of the math department. An applied mathematician with interests in flow of liquids through porous media, Slichter realized the department needed to strengthen the faculty in pure mathematics. 4 Edward B. Van Vleck 1863‐1943 Edward B Van Vleck, had earned a PhD in mathematics at Gottingen in1893, and was a member of the National Academy of Sciences. Slichter’s first action as department head was to recruit Van Vleck to bring strength in pure mathematics. 5 John Hasbrouck Van Vleck was born in 1899. His interest in trains began at a early age. Van attended his first Wisconsin football game at age 10.(Wisconsin vs Minnesota) It was the first game at which the band played the famous song “On Wisconsin”. As an undergraduate at Wisconsin, Van played flute In the band. -
November 2011 Volume 20, No.10 TM
November 2011 Volume 20, No.10 TM www.aps.org/publications/apsnews APS NEWS Focus on Northwest Section A PublicAtion of the AmericAn PhysicAl society • www.APs.org/PublicAtions/APsnews/index.cfm see page 6 Physical Review X Out of the Gate APS Helps Deconstruct the iPad on Capitol Hill The premier issue of Physical and exploring a physical model that By Mary Catherine Adams Review X, the new APS open ac- incorporates natural human-mobil- Congressional staffers gath- cess journal, hit the virtual news- ity patterns, challenges established ered at the Rayburn House Office stands on September 30th. PRX’s models for the spread of epidemics, Building in Washington on Sept. first twelve papers, in what will be and has, since its publication, re- 21 to learn about how basic sci- a quarterly journal, span a broad ceived attention in several national ence research was integral to the spectrum of fields and are all of media. Another paper comes from development of the iPad–a tool high scientific quality. Unlike other the area of electronic-devices re- many on Capitol Hill use daily. APS journals, which are mainly search, reporting the fabrication of In an effort to persuade Con- supported by subscription revenue, new nanowire-based electronic di- gress to invest in scientific re- PRX is supported by an article-pro- odes and demonstrating their ultra- search, the APS, participating cessing charge of $1500 for papers fast operating speeds and control- with the Task Force on American of less than 20 standard Physical lability. A third paper, also covered Innovation (TFAI) and several Review pages, with small incre- with a Synopsis in Physics, brings other organizations, hosted an mental charges for longer papers.