CMB-S4 Decadal Survey APC White Paper

K. Abazajian;G. Addison;Peter Adshead;Z. Ahmed;S. Allen;D. Alonso;M. Alvarez;M. Amin;A. Anderson;K. Arnold;C. Baccigalupi;K. Bailey;D. Barkats;D. Barron;P. Barry;J. Bartlett;R. Thakur;N. Battaglia;E. Baxter;R. Bean;C. Bebek;A. Bender;B. Benson;E. Berger;Sanah Bhimani;C. Bischoff;L. Bleem;J. Bock;S. Bocquet;K. Boddy;M. Bonato;J. Bond;J. Borrill;F. Bouchet;Michael L. Brown;S. Bryan;B. Burkhart;V. Buza;K. Byrum;E. Calabrese;Victoria Calafut;R. Caldwell;J. Carlstrom;J. Carron;T. Cecil;A. Challinor;C. Chang;Y. Chinone;Hsiao-mei Cho.;A. Cooray;T. Crawford;A. Crites;A. Cukierman;F. Cyr-Racine;T. Haan;G. Zotti;J. Delabrouille;M. Demarteau;M. Devlin;E. D. Valentino;M. Dobbs;S. Duff;A. Duivenvoorden;C. Dvorkin;W. Edwards;J. Eimer;J. Errard;T. Essinger-Hileman;G. Fabbian;C. Feng;S. Ferraro;J. Filippini;R. Flauger;B. Flaugher;A. Fraisse;A. Frolov;N. Galitzki;S. Galli;K. Ganga;M. Gerbino;M. Gilchriese;V. Gluscevic;D. Green;D. Grin;E. Grohs;R. Gualtieri;V. Guarino;J. Gudmundsson;S. Habib;G. Haller;M. Halpern;N. Halverson;S. Hanany;K. Harrington;M. Hasegawa;M. Hasselfield;M. Hazumi;K. Heitmann;S. Henderson;J. Henning;J. Hill;R. Hložek;G. Holder;W. Holzapfel;J. Hubmayr;K. Huffenberger;M. Huffer;H. Hui;K. Irwin;Bradley R. Johnson;D. Johnstone;W. Jones;K. Karkare;N. Katayama;James Kerby;Sarah Kernovsky;R. Keskitalo;T. Kisner;L. Knox;A. Kosowsky;J. Kovac;E. Kovetz;S. Kuhlmann;C. Kuo;N. Kurita;A. Kusaka;A. Lahteenmaki;C. Lawrence;Adrian T. Lee;A. Lewis;Dale Li;E. Linder;M. Loverde;A. Lowitz;M. Madhavacheril;A. Mantz;F. Matsuda;P. Mauskopf;J. McMahon;P. Meerburg;J. Melin;Joel Meyers;M. Millea;J. Mohr;L. Moncelsi;T. Mroczkowski;S. Mukherjee;M. Munchmeyer;D. Nagai;J. Nagy;T. Namikawa;F. Nati;T. Natoli;M. Negrello;L. Newburgh;M. Niemack;H. Nishino;M. Nordby;V. Novosad;P. O'Connor;G. Obied;S. Padin;Shivam Pandey;B. Partridge;E. Pierpaoli;L. Pogosian;C. Pryke;G. Puglisi;B. Racine;S. Raghunathan;A. Rahlin;Srinivasan Rajagopalan;M. Raveri;M. Reichanadter;C. Reichardt;M. Remazeilles;G. Rocha;N. Roe;A. Roy;J. Ruhl;M. Salatino;B. Saliwanchik;E. Schaan;A. Schillaci;M. Schmittfull;D. Scott;N. Sehgal;S. Shandera;C. Sheehy;B. Sherwin;E. Shirokoff;S. Simon;A. Slosar;R. Somerville;S. Staggs;A. Stark;R. Stompor;K. Story;C. Stoughton;A. Suzuki;O. Tajima;G. Teply;K. Thompson;P. Timbie;M. Tomasi;J. Treu;M. Tristram;G. Tucker;C. Umilta;A. V. Engelen;J. Vieira;A. Vieregg;M. Vogelsberger;Gensheng Wang;S. Watson;M. White;N. Whitehorn;Edward J. Wollack;W. L. K. Wu;Zhilei Xu;S. Yasini;J. Yeck;K. Yoon;E. Young;A. Zonca