GW Notes Special Issue: eLISA/NGO, revealing a hidden universe Notes & News for GW science Guest editors: David Spergel and Zhang Shuangnan Editors: Pau Amaro-Seoane and Bernard F. Schutz ISSN: 1868-1921 GW Notes was born from the need for a journal where the distinct communities in- volved in gravitational wave research might gather. While these three communities - Astrophysics, General Relativity and Data Analysis - have made significant collabora- tive progress over recent years, we believe that it is indispensable to future advancement that they draw closer, and that they speak a common idiom. Notes & News for GW science 1 Publisher: Max-Planck-Institut für Gravitationsphysik (Albert-Einstein-Institut) Am Mühlenberg 1 14476 Potsdam Germany Editors: P. Amaro Seoane and B.F. Schutz ISSN: 1868-1921 URL: http://brownbag.lisascience.org/lisa-gw-notes/ Notes & News for GW science #6 May 28, 2013 GW Notes 1 Notes & News for GW science eLISA/NGO: Revealing a hidden universe Editorial Prof. A. Lobo As you proably know, Prof. José Alberto Lobo Gutiérrez passed away last September 30 2012. He left behind a wife (Rosa Maria), a son (Albert), and a daughter (Montser- rat). Prof. Lobo has been a pioneer of the field of Gravitational Wave Astronomy in Spain, devoting his life to resonant ground-based detectors and to space-based ones. His contributions range from theoretical studies to the development of instrumen- tation, including data analysis methods. Even in the final stages of his cancer, he was mainly concerned and actively planning towards maintaining and promoting Notes & News for GW science the Spanish team activities and involvement into LISA PathFinder and its successor mission LISA. José Alberto Lobo Gutiérrez obtained his PhD from the University of Barcelona (UB) in 1980, doing research under the supervision of Prof. Joaquim Gomis and writing a thesis in “Dynamics of Relativistic Particles”. Afterwards, he worked at the UB for about 25 years where he taught a variety of topics, many of them theoretical, like mathematical methods of physics or General Relativity, but also experimental. During all this time he had the opportunity to interact with many students. His very personal way of teaching has left an imprint on most of his students. He also supervised eight PhD thesis on gravitational wave astronomy. His research path started in the area of theoretical physics but his research interests evolved towards the area of gravitational physics and of gravitational wave astron- omy, where he has been a pioneer of the field in Spain. His contributions to this field cover a wide range of topics, from theoretical studies to the design and development of instrumentation, including data analysis techniques. After more than a decade of working on science related to ground-based gravitational-wave observatories, mainly on resonant detectors, he got involved in the endeavor of designing and building a space-based gravitational-wave detector, the Laser Interferometer Space Antenna (LISA). To that end he formed a new group from scratch at the Institut de Ciències de l’Espai (ICE; CSIC-IEEC). With this group he led the Spanish contribution to the LISA PathFinder mission and also research towards a future LISA mission. In 2005 he moved to the ICE as a CSIC Research Professor, where he remained. During these years, the ICE group has contributed the Data and Diagnostic Subsystem of the LISA Technology Package (LTP), the pay- load of LISA PathFinder. This consists of highly stable temperature sensors, magne- tometers and a particle counter to monitor the experiment environment, plus heaters and magnetic coils. These instruments will monitor and characterize the experiment 2 GW Notes May 28, 2013 Notes & News for GW science eLISA/NGO: Revealing a hidden universe during flight operations. In addition, the Data Management Unit will act as the com- puter of the LTP experiment, processing the measurements and controlling different subsystems. This hardware package, together with the flight software, has been de- livered for its final integration in the satellite. Alberto Lobo was also a member of the LISA International Science Team and of the Science Team for eLISA/NGO. His leadership and human qualities have been fun- damental for the success of the enterprise he initiated at the ICE. Probably, one of his biggest achievements has been to transmit his passion and his joy for science to everybody around him, and to prepare a generation of scientists that will continue the efforts that he pioneered. Since we have been authors on the highlight article of this issue of GW Notes, we have approached David Spergel and Zhang Shuangnan and asked them to be guest editors, so that the refereed process was anonymous. We thank them for their effort with the communication with the referee. Notes & News for GW science Due to the length of this article, we have decided to exclude from this issue the ab- stracts of those papers published on the arxiv since the previous GW Notes. Alberto was a valued colleague and friend, and will be sorely missed by the grav- itational wave community. It is our hope that this article will help in keeping his memory alive. Pau Amaro-Seoane & Bernard F. Schutz, editors #6 May 28, 2013 GW Notes 3 Notes & News for GW science eLISA/NGO: Revealing a hidden universe GW Notes highlight article eLISA/NGO eLISA/NGO: Astrophysics and cosmology in the gravitational-wave millihertz regime Pau Amaro-Seoane 1, Sofiane Aoudia 1, Stanislav Babak 1, Pierre Binétruy 2, Emanuele Berti 3; 4, Alejandro Bohé 5, Chiara Caprini 6, Monica Colpi 7, Neil J. Cornish 8, Karsten Danzmann 1, Jean-François Dufaux 2, Jonathan Gair 9, Ian Hinder 1, Oliver Jennrich 10, Philippe Jetzer 11, Antoine Klein 11; 8, Ryan N. Lang 12, Alberto Lobo 13, Tyson Littenberg 14; 15, Sean T. McWilliams 16, Gijs Nelemans 17; 18; 19, Antoine Notes & News for GW science Petiteau 2; 1, Edward K. Porter 2, Bernard F. Schutz 1, Alberto Sesana 1, Robin Stebbins 20, Tim Sumner 21, Michele Vallisneri 22, Stefano Vitale 23, Marta Volonteri 24; 25, Henry Ward 26 and Barry Wardell 1; 27 1Max Planck Institut für Gravitationsphysik (Albert-Einstein-Institut), Germany , 2APC, Univ. Paris Diderot, CNRS/IN2P3, CEA/Irfu, Obs. de Paris, Sorbonne Paris Cité, France , 3Department of Physics and Astronomy, The University of Mississippi, University, MS 38677, USA , 4Division of Physics, Mathematics, and Astronomy, California Institute of Technology, Pasadena CA 91125, USA , 5UPMC- CNRS, UMR7095, Institut d’Astrophysique de Paris, F-75014, Paris, France , 6Institut de Physique Théorique, CEA, IPhT, CNRS, URA 2306, F-91191Gif/Yvette Cedex, France , 7University of Milano Bicocca, Milano, I-20100, Italy , 8Department of Physics, Montana State University, Bozeman, MT 59717, USA , 9Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge, CB3 0HA, UK , 10ESA, Keplerlaan 1, 2200 AG Noordwijk, The Netherlands , 11Institute of Theoretical Physics University of Zürich, Winterthurerstr. 190, 8057 Zürich Switzerland , 12Washington University in St. Louis, One Brookings Drive, St. Louis, MO 63130, USA , 13Institut de Ciències de l’Espai (CSIC-IEEC), Campus UAB, Torre C-5, parells, 2na planta, ES-08193, Bellaterra, Barcelona, Spain , 14Maryland Center for Fundamental Physics, Department of Physics, University of Maryland, College Park, MD 20742 , 15Gravitational Astrophysics Laboratory, NASA Goddard Spaceflight Center, 8800 Greenbelt Rd., Greenbelt, MD 20771, USA , 16Department of Physics, Princeton University, Princeton, NJ 08544, USA , 17Department of Astrophysics, Radboud University Nijmegen, The Netherlands , 18Institute for Astronomy, KU Leuven, Celestijnenlaan 200D, 3001 Leuven, Belgium , 19Nikhef, Science Park 105, 1098 XG Amsterdam, The Netherlands , 20NASA Liason, NASA GSFC, USA , 21Imperial College, UK , 22Jet Propulsion Laboratory, California Inst. of Technology, Pasadena, CA 91109, USA , 23University of Trento, Department of Physics, I38050 Povo, Trento, Italy , 24Institut d’Astrophysique de Paris, 98bis Boulevard Arago, 75014 Paris, France , 25Astronomy Department, University of Michigan, Ann Arbor, MI 48109, USA , 26Institute for Gravitational Research, Department of Physics & Astronomy Kelvin Building, University of Glasgow, Glasgow , 27School of Mathematical Sciences and Complex & Adaptive Systems Laboratory, University College Dublin, Belfield, Dublin 4, Ireland. 4 GW Notes May 28, 2013 Notes & News for GW science eLISA/NGO: Revealing a hidden universe We acknowledge the LISA Pathfinder Team and the rest of the members of the former joint science team for LISA, whose work constituted a crucial starting point for our ar- ticle: F. Antonucci, M. Armano, H. Audley, G. Auger, M. Benedetti, J. Bogenstahl, D. Bor- toluzzi, N. Brandt, M. Caleno, A. Cavalleria, G. Congedo, M. Cruise, F. De Marchia, M. Diaz-Aguilo, I. Diepholz, G. Dixon, R. Dolesi, N. Dunbar, J. Fauste, L. Ferraioli, V. Ferroni, W. Fichter, E. Fitzsimons, M. Freschi, C. García Marirrodriga, R. Gerndt, L. Gesa, F. Gibert, D. Giardini, C. Grimani, A. Grynagier, F. Guzmán, H. Halloin, I. Harrison, G. Heinzel, M. Hewitson, D. Hollington, D. Hoyland, M. Hueller, J. Huesler, B. Johlander, N. Karnesis, N. Korsakova, C. Killow, X. Llamas, I. Lloro, R. Maarschalkerweerd, S. Madden, D. Mance, V. Martin, I. Mateos, P. McNamara, J. Mendes, E. Mitchells, D. Nicolodi, M. Nofrarias, M. Perreur-Lloyd, E. Plagnol, P. Notes & News for GW science Prat, J. Ramos-Castro, J. Reiche, J.A. Romera Pérez, D. Robertson, H. Rozemeijer, G. Russano, A. Schleicher,