Concepts and research for future detectors

F. Acernese;F. Barone;A. Bell;G. Bergmann;D. Blair;M. Born;D. Brown;X. Chen;S. L. Danilishin;J. Degallaix;T. Denker;A. D. Di Virgilio;C. Frajuca;D. Friedrich;P. Fulda;H. Grote;S. Huttner;Jun Kato;S. Köhlenbeck;S. Leavey;H. Lück;M. Nakano;R. Palmer;M. Punturo;P. Raffai;D. Schütte;D. Simakov;B. Slagmolen;K. Somiya;J. Steinlechner;S. Steinlechner;S. Tarabrin;A. Wade;M. Wang;T. Westphal;C. Zhao;R. Adhikari;M. Adier;K. Agatsuma;B. Barr;R. Bassiri;J. Bauchrowitz;C. Blair;C. Bond;K. Bongs;F. Bortoli;G. Cagnoli;P. Calia;R. Canonico;L. Carbone;S. Chua;E. Coccia;J. Cripe;L. Cunningham;K. Danzmann;R. De Rosa;V. Fafone;M. Fejer;R. Flaminio;J. Fontaine;D. Forest;A. Freise;A. Furusawa;F. Garufi;G. Giordano;L. Gondán;N. Gordon;S. Gossler;C. Gräf;M. Granata;K. Hammerer;I. Heng;M. Heurs;S. Hild;S. Hirobayashi;J. Hough;L. Ju;H. Kaufer;H. Kawamura;S. Kawamura;N. Kelecsényi;A. Khalaidovski;F. Khalili;K. Kuroda;G. Loddo;J. Logue;Y. Ma;J. Macarthur;N. Magalhaes;E. Majorana;V. Malvezzi;S. Márka;Z. Márka;I. Martin;D. McClelland;M. Meinders;C. Michel;J. Miller;N. Morgado;H. Müller;L. Naticchioni;T. Nguyen;M. Perciballi;L. Pinard;P. Puppo;P. Rapagnani;F. Ricci;P. Risson;A. Rocchi;E. Rocco;R. Romano;R. Route;S. Rowan;S. Sakata;R. Schnabel;D. Shaddock;B. Sorazu;M. Stefszky;D. Steinmeyer;K. Strain;N. Voronchev;R. Ward;M. Wimmer