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Astrophysical Tests of Modified Gravity
University of Cambridge Department of Applied Mathematics and Theoretical Physics Astrophysical Tests of Modified Gravity Jeremy Aaron Sakstein This thesis is submitted to the University of Cambridge for the degree of Doctor of Philosophy Downing College Cambridge, United Kingdom March 2014 Ph.D. Dissertation, March 2014 Jeremy Aaron Sakstein Department of Applied Mathematics and Theoretical Physics & Downing College University of Cambridge, United Kingdom This thesis is dedicated to my mother, Laura Sakstein, who unequivocally supported and aided me throughout my entire academic career, which ultimately led to the completion of this thesis. Abstract Einstein’s theory of general relativity has been the accepted theory of gravity for nearly a century but how well have we really tested it? The laws of gravity have been probed in our solar system to extremely high precision using several different tests and general relativity has passed each one with flying colours. Despite this, there are still some mysteries it cannot account for, one of which being the recently discovered acceleration of the universe and this has prompted a theoretical study of modified theories of gravity that can self-accelerate on large scales. Indeed, the next decade will be an exciting era where several satellites will probe the structure of gravity on cosmological scales and put these theoretical predictions to the test. Despite this, one must still worry about the behaviour of gravity on smaller scales and the vast majority of these theories are rendered cosmologically uninteresting when confronted with solar system tests of gravity. This has motivated the study of theories that differ from general relativity on large scales but include screening mechanisms which act to hide any modifications in our own solar system. -
Arxiv:2103.07476V1 [Astro-Ph.GA] 12 Mar 2021
FERMILAB-PUB-21-075-AE-LDRD Draft version September 3, 2021 Typeset using LATEX twocolumn style in AASTeX63 The DECam Local Volume Exploration Survey: Overview and First Data Release A. Drlica-Wagner ,1, 2, 3 J. L. Carlin ,4 D. L. Nidever ,5, 6 P. S. Ferguson ,7, 8 N. Kuropatkin ,1 M. Adamow´ ,9, 10 W. Cerny ,2, 3 Y. Choi ,11 J. H. Esteves,12 C. E. Mart´ınez-Vazquez´ ,13 S. Mau ,14, 15 A. E. Miller,16, 17 B. Mutlu-Pakdil ,2, 3 E. H. Neilsen ,1 K. A. G. Olsen ,6 A. B. Pace ,18 A. H. Riley ,7, 8 J. D. Sakowska ,19 D. J. Sand ,20 L. Santana-Silva ,21 E. J. Tollerud ,11 D. L. Tucker ,1 A. K. Vivas ,13 E. Zaborowski,2 A. Zenteno ,13 T. M. C. Abbott ,13 S. Allam ,1 K. Bechtol ,22, 23 C. P. M. Bell ,16 E. F. Bell ,24 P. Bilaji,2, 3 C. R. Bom ,25 J. A. Carballo-Bello ,26 D. Crnojevic´ ,27 M.-R. L. Cioni ,16 A. Diaz-Ocampo,28 T. J. L. de Boer ,29 D. Erkal ,19 R. A. Gruendl ,30, 31 D. Hernandez-Lang,32, 13, 33 A. K. Hughes,20 D. J. James ,34 L. C. Johnson ,35 T. S. Li ,36, 37, 38 Y.-Y. Mao ,39, 38 D. Mart´ınez-Delgado ,40 P. Massana,19, 41 M. McNanna ,22 R. Morgan ,22 E. O. Nadler ,14, 15 N. E. D. Noel¨ ,19 A. Palmese ,1, 2 A. H. G. Peter ,42 E. S. -
AMERICAN MUSEUM NOVITATES Published by Number 895 the AMERICAN MUSEUM of NATURAL HISTORY Dec
AMERICAN MUSEUM NOVITATES Published by Number 895 THE AMERICAN MUSEUM OF NATURAL HISTORY Dec. 31 1936 New York City THE NEARCTIC ATYPIDAE By W. J. GERTSCH The curious spiders now comprising the Atypidae were set apart many years ago by various authors as representing a group which, though obviously closely related to the other mygalomorph species, was worthy of separation from them in some way, either as a genus, a sub- family, or a family. The genus Atypus dates from 1804, when Latreille used the name for the first time in a generic sense. Aranea subterranea Roemer, now placed as a synonym of Atypus piceus (Sulzer), was desig- nated as the genotype by this same author in 1810. Ausserer in his 'Beitrage zur Kenntniss der Arachniden-Familie der Territelariae' recognized a subfamily Atypinae, which name had been used pro- visionally by Thorell in 1869-1870, and included three generic cate- gories, Calommata Lucas, its synonym Pelecodon Doleschal, and Atypus Latreille. This author placed two of the American species in Atypus but erected the new genus Madognatha for Sphodros abbotii Walckenaer, assigning it to the subfamily Theraphosinae. The family name, Atypidae, was proposed by P. Bertkau in 1878 and was based on the characters presented in the German species of Atypus. A little later Thorell (1889-1890) divided his Territelariae into five families and for some reason substituted the name Calommatoidae for the Atypidae of Bertkau. In the 'Historie Naturelle des Araginees' Simon restored the name Atypidae and considerably enlarged the limits of the family by including twenty-four species representing six genera, and placed them in three subfamilies, the Brachybothrinae, Hexurinae, and Atypinae. -
Jrasc-August'99 Text
Publications and Products of August/août 1999 Volume/volume 93 Number/numero 4 [678] The Royal Astronomical Society of Canada Observer’s Calendar — 2000 This calendar was created by members of the RASC. All photographs were taken by amateur astronomers using ordinary camera lenses and small telescopes and represent a wide spectrum of objects. An informative caption accompanies every photograph. This year all of the photos are in full colour. The Journal of the Royal Astronomical Society of Canada Le Journal de la Société royale d’astronomie du Canada It is designed with the observer in mind and contains comprehensive astronomical data such as daily Moon rise and set times, significant lunar and planetary conjunctions, eclipses, and meteor showers. The 1999 edition received two awards from the Ontario Printing and Imaging Association, Best Calendar and the Award of Excellence. (designed and produced by Rajiv Gupta). Price: $13.95 (members); $15.95 (non-members) (includes taxes, postage and handling) The Beginner’s Observing Guide This guide is for anyone with little or no experience in observing the night sky. Large, easy to read star maps are provided to acquaint the reader with the constellations and bright stars. Basic information on observing the moon, planets and eclipses through the year 2005 is provided. There is also a special section to help Scouts, Cubs, Guides and Brownies achieve their respective astronomy badges. Written by Leo Enright (160 pages of information in a soft-cover book with otabinding which allows the book to lie flat). Price: $15 (includes taxes, postage and handling) Looking Up: A History of the Royal Astronomical Society of Canada Published to commemorate the 125th anniversary of the first meeting of the Toronto Astronomical Club, “Looking Up — A History of the RASC” is an excellent overall history of Canada’s national astronomy organization. -
The Recent Star Formation in Sextans a Schuyler D
THE ASTRONOMICAL JOURNAL, 116:2341È2362, 1998 November ( 1998. The American Astronomical Society. All rights reserved. Printed in U.S.A. THE RECENT STAR FORMATION IN SEXTANS A SCHUYLER D. VAN DYK1 Infrared Processing and Analysis Center, California Institute of Technology, Mail Code 100-22, Pasadena, CA 91125; vandyk=ipac.caltech.edu DANIEL PUCHE1 Tellabs Transport Group, Inc., 3403 Griffith Street, Ville St. Laurent, Montreal, Quebec H4T 1W5, Canada; Daniel.Puche=tellabs.com AND TONY WONG1 Department of Astronomy, University of California at Berkeley, 601 Cambell Hall, Berkeley, CA 94720-3411; twong=astro.berkeley.edu Received 5 February 1998; revised 1998 July 8 ABSTRACT We investigate the relationship between the spatial distributions of stellar populations and of neutral and ionized gas in the Local Group dwarf irregular galaxy Sextans A. This galaxy is currently experi- encing a burst of localized star formation, the trigger of which is unknown. We have resolved various populations of stars via deepUBV (RI) imaging over an area with [email protected]. We have compared our photometry with theoretical isochronesC appropriate for Sextans A, in order to determine the ages of these populations. We have mapped out the history of star formation, most accurately for times [100 Myr. We Ðnd that star formation in Sextans A is correlated both in time and space, especially for the most recent([12 Myr) times. The youngest stars in the galaxy are forming primarily along the inner edge of the large H I shell. Somewhat older populations,[50 Myr, are found inward of the youngest stars. Progressively older star formation, from D50È100 Myr, appears to have some spatially coherent structure and is more centrally concentrated. -
Location Privacy Without Mutual Trust: the Spatial Bloom Filter
CORE Metadata, citation and similar papers at core.ac.uk Provided by Bournemouth University Research Online Location privacy without mutual trust: the Spatial Bloom Filter a, b a Luca Calderoni ∗, Paolo Palmieri , Dario Maio aDepartment of Computer Science and Engineering, University of Bologna, Cesena, FC, 47521 Italy bBournemouth University, Poole, Dorset, BH12 5BB, UK Abstract Location-aware applications are one of the biggest innovations brought by the smartphone era, and are effectively changing our everyday lives. But we are only starting to grasp the privacy risks associated with constant tracking of our whereabouts. In order to continue using location-based services in the future without compromising our privacy and security, we need new, privacy-friendly applications and protocols. In this paper, we propose a new compact data structure based on Bloom filters, designed to store location information. The Spatial Bloom Filter (SBF), as we call it, is designed with privacy in mind, and we prove it by presenting two private positioning protocols based on the new primitive. The protocols keep the user’s exact position private, but allow the provider of the service to learn when the user is close to specific points of interest, or inside predefined areas. At the same time, the points and areas of interest remain oblivious to the user. The two proposed protocols are aimed at different scenarios: a two-party setting, in which communication happens directly between the user and the service provider, and a three-party setting, in which the service provider outsources to a third party the communication with the user. A detailed evaluation of the efficiency and security of our solution shows that privacy can be achieved with minimal computational and communication overhead. -
Next Generation Space Defense May 2021
Next Generation Space Defense MilsatMagazineMilsatMagazine May 2021 Cover image: United Launch Alliance’s Delta IV Heavy rocket carrying the NROL-82 mission for the National Reconnaissance Office lifts off from Space Launch Complex-6 at Vandenberg Air Force Base in California. Image Source: United Launch Alliance Beyond Secure Satcoms Publishing OPeratiOns disPatChes Features Eutelsat + OneWeb .................................................. 4 How SATCOM Vastly Improves .............................. 12 Silvano Payne, Publisher + Executive Writer Small UAV Flexibility Simon Payne, Chief Technical Officer Author: Get SAT Hartley G. Lesser, Editorial Director ULA + NRO ............................................................... 6 Pattie Lesser, Executive Editor Donald McGee, Production Manager USSF/SMC + Raytheon I&S ...................................... 8 Teresa Sanderson, Operations Director Sean Payne, Business Development Manager Lockheed Martin ....................................................... 8 Dan Makinster, Technical Advisor High Availability Maritime SATCOM....................... 18 Starts On The Ship Space Flight Laboratory ......................................... 10 Author: Dr. Rowan Gilmore, EM Solutions seniOr COlumnists Virgin Orbit ............................................................ 11 and COntributOrs Hughes + OneWeb ................................................. 15 Delivering Mission-Critical Connectivity with ........ 28 Chris Forrester, Broadgate Publications Reliability and Resilience Loft Orbital -
CARMA CO OBSERVATIONS of THREE EXTREMELY METAL-POOR, STAR-FORMING GALAXIES Steven R
CORE Metadata, citation and similar papers at core.ac.uk Provided by The Australian National University The Astrophysical Journal, 814:30 (9pp), 2015 November 20 doi:10.1088/0004-637X/814/1/30 © 2015. The American Astronomical Society. All rights reserved. CARMA CO OBSERVATIONS OF THREE EXTREMELY METAL-POOR, STAR-FORMING GALAXIES Steven R. Warren1, Edward Molter2, John M. Cannon2, Alberto D. Bolatto1, Elizabeth A. K. Adams3, Elijah Z. Bernstein-Cooper4, Riccardo Giovanelli5, Martha P. Haynes5, Rodrigo Herrera-Camus1, Katie Jameson1, Kristen B. W. McQuinn6,7, Katherine L. Rhode8, John J. Salzer8, and Evan D. Skillman9 1 Department of Astronomy, University of Maryland, College Park, MD 20742, USA; [email protected], [email protected], [email protected], [email protected] 2 Department of Physics & Astronomy, Macalester College, 1600 Grand Avenue, Saint Paul, MN 55105, USA; [email protected], [email protected] 3 Netherlands Institute for Radio Astronomy (ASTRON), Postbus 2, 7990 AA, Dwingeloo, The Netherlands; [email protected] 4 Department of Astronomy, University of Wisconsin, 475 N Charter Street, Madison, WI 53706, USA; [email protected] 5 Center for Radiophysics and Space Research, Space Sciences Building, Cornell University, Ithaca, NY 14853, USA; [email protected], [email protected] 6 Minnesota Institute for Astrophysics, University of Minnesota, Minneapolis, MN 55455, USA; [email protected] 7 McDonald Observatory; The University of Texas; Austin, TX 78712, USA 8 Department of Astronomy, Indiana University, Bloomington, IN 47405, USA; [email protected], [email protected] 9 Minnesota Institute for Astrophysics, University of Minnesota, 116 Church St. -
Éditeur Officiel Du Québec Updated to August 1 2016 This Document Has Official Status
0 0 8 1 © Éditeur officiel du Québec Updated to August 1 2016 This document has official status. chapter R-20, r. 6.1 Regulation respecting the hiring and mobility of employees in the construction industry L A Act respecting labour relations, vocational training and workforce management in the construction industry B O(chapter R-20, s. 123.1, subpar. 13) RU 1O-R 2D.R eC0E TABLE OF CONTENTS c.L e1A m9 DIVISION I T DEFINITIONS.................................................................................................... 1 b4I e6O DIVISION II r-N DIVISION III 38S 02— DIVISION IV ,;C SO DIVISION V 1.N HIRING............................................................................................................... 35 8QS DIVISION VI 9.T GENERAL PROVISIONS.................................................................................. 40 91R 9U 9C 3T ,I cO .N 6— 1H ,I sR .I 7N 2G .A N D M O B I L I T Y Updated to 0August 01 2016 © Éditeur officiel8 du1 Québec R-20, r. 6.1 / 1 of 23 LABOUR RELATIONS — CONSTRUCTION — HIRING AND MOBILITY DIVISION I DEFINITIONS 1. In this Regulation, unless the context requires otherwise, “apprentice” means a person holding an apprentice competency certificate issued under the Regulation respecting the issuance of competency certificates (chapter R-20, r. 5); “remote site” means a site inaccessible by a passable road connected to the roads network of the Province of Québec and the James Bay region; “graduate” means a person with a secondary school diploma granted for one of the construction trades and issued by an institution recognized by the Ministère de l’Éducation, du Loisir et du Sport; “remote area” means an area inaccessible by a passable road connected to the roads network of the Province of Québec, and an island situated along the St. -
Validation of Globsnow-2 Snow Water Equivalent Over Eastern Canada
1 Validation of GlobSnow-2 snow water equivalent over 2 Eastern Canada 3 Fanny Larue1,2,3, Alain Royer1,2, Danielle De Sève3, Alexandre Langlois1,2, Alexandre 4 Roy1,2 and Ludovic Brucker4,5 5 1 Centre d’Applications et de Recherches en Télédétection, Université de Sherbrooke, 6 Sherbrooke, Québec, Canada 7 2 Centre for Northern Studies, Québec, Canada 8 3 IREQ Hydro-Québec, Varenne, Québec, Canada 9 4 NASA GSFC, Cryospheric Sciences Laboratory, Greenbelt, MD 20771, USA 10 5 Universities Space Research Association, Goddard Earth Sciences Technology and Research 11 Studies and Investigations, Columbia, MD 21044, USA 12 13 * Correspondance: Fanny Larue, CARTEL, Département de Géomatique Appliquée, 14 Université de Sherbrooke, 2500 Blvd. de l’Université, Sherbrooke, QC J1K 2R1, Canada. 15 E-mail address: [email protected] 16 17 Abstract: In Québec, Eastern Canada, snowmelt runoff contributes more than 30% of 18 the annual energy reserve for hydroelectricity production, and uncertainties in annual 19 maximum snow water equivalent (SWE) over the region are one of the main 20 constraints for improved hydrological forecasting. Current satellite-based methods for 21 mapping SWE over Québec's main hydropower basins do not meet Hydro-Québec 22 operational requirements for SWE accuracies with less than 15% error. This paper 23 assesses the accuracy of the GlobSnow-2 (GS-2) SWE product, which combines 24 microwave satellite data and in situ measurements, for hydrological applications in 25 Québec. GS-2 SWE values for a 30-year period (1980 to 2009) were compared with 26 space- and time-matched values from a comprehensive dataset of in situ SWE 27 measurements (a total of 38 990 observations in Eastern Canada). -
Location Privacy Without Mutual Trust: the Spatial Bloom Filter
Location privacy without mutual trust: the Spatial Bloom Filter a, b a Luca Calderoni ∗, Paolo Palmieri , Dario Maio aDepartment of Computer Science and Engineering, University of Bologna, Cesena, FC, 47521 Italy bBournemouth University, Poole, Dorset, BH12 5BB, UK Abstract Location-aware applications are one of the biggest innovations brought by the smartphone era, and are effectively changing our everyday lives. But we are only starting to grasp the privacy risks associated with constant tracking of our whereabouts. In order to continue using location-based services in the future without compromising our privacy and security, we need new, privacy-friendly applications and protocols. In this paper, we propose a new compact data structure based on Bloom filters, designed to store location information. The Spatial Bloom Filter (SBF), as we call it, is designed with privacy in mind, and we prove it by presenting two private positioning protocols based on the new primitive. The protocols keep the user’s exact position private, but allow the provider of the service to learn when the user is close to specific points of interest, or inside predefined areas. At the same time, the points and areas of interest remain oblivious to the user. The two proposed protocols are aimed at different scenarios: a two-party setting, in which communication happens directly between the user and the service provider, and a three-party setting, in which the service provider outsources to a third party the communication with the user. A detailed evaluation of the efficiency and security of our solution shows that privacy can be achieved with minimal computational and communication overhead. -
List of Publications (06/2021)
Prof. Dr. Eva K. Grebel, Astronomisches Rechen-Institut, Zentrum f¨urAstronomie der Universit¨at Heidelberg, M¨onchhofstr. 12{14, D-69120 Heidelberg, Germany List of Publications (06/2021) A. Refereed publications (443) . 1 B. Reviews (34) . 47 C. Conference proceedings etc. (175) 50 D. Abstracts (141) . 66 E. Books (2) . 77 In publications with my students or postdocs their names are underlined when this work was completed (or partially carried out) while they held their position with me. A. Refereed Publications 1. Menon, S.H., Grasha, K., Elmegreen, B.G., Federrath, C., Krumholz, M.R., Calzetti, D., S´anchez, N., Linden, S.T., Adamo, A., Messa, M., Cook, D.O., Dale, D.A., Grebel, E.K., Fumagalli, M., Sabbi, E., Johnson, K.E., Smith, L.J., & Kennicutt, R.C. The Dependence of the Hierarchical Distribution of Star Clusters on Galactic En- vironment 2021, MNRAS, submitted 2. D´ek´any, I., Grebel, E.K., & Pojmanski, G. Metallicity estimation of RR Lyrae stars from their I-band light curves 2021, ApJ, submitted 3. Gatto, M., Ripepi, V., Bellazzini, M., Tosi, M., Cignoni, M., Tortora, C., Leccia, S., Clementini, G., Grebel, E.K., Longo, G., Marconi, M., & Musella, I. STEP Survey II: Structural Analysis of 170 star clusters in the SMC 2021, MNRAS, submitted 4. Orozco-Duarte, R., Wofford, A., Vidal-Garc´ıa, A., Bruzual, G., Charlot, S., Krumholz, M., Hannon, S., Lee, J., Wofford, T., Fumagalli, M., Dale, D., Messa, M., Grebel, E.K., Smith, L., Grasha, K., & Cook, D. Synthetic photometry of OB star clusters with stochastically sampled IMFs: anal- ysis of models and HST observations 2021, MNRAS, submitted 5.