K
Kazuya Koyama
Researcher at Institute of Cosmology and Gravitation, University of Portsmouth
Publications - 465
Citations - 23547
Kazuya Koyama is an academic researcher from Institute of Cosmology and Gravitation, University of Portsmouth. The author has contributed to research in topics: General relativity & Dark energy. The author has an hindex of 77, co-authored 453 publications receiving 21217 citations. Previous affiliations of Kazuya Koyama include University of Tokyo & Kyoto University.
Papers
More filters
Journal ArticleDOI
Brane-World Gravity
Roy Maartens,Kazuya Koyama +1 more
TL;DR: In this article, the authors discuss the geometry, dynamics and perturbations of simple brane-world models for cosmology and astrophysics, mainly focusing on warped 5-dimensional braneworlds based on the Randall-Sundrum models.
Posted Content
The DESI Experiment Part I: Science,Targeting, and Survey Design
Amir Aghamousa,Jessica Aguilar,S. P. Ahlen,Shadab Alam,Lori E. Allen,Carlos Allende Prieto,James Annis,Stephen Bailey,Christophe Balland,O. Ballester,C. Baltay,Lucas Beaufore,Chris Bebek,Timothy C. Beers,Eric F. Bell,José Luis Bernal,Robert Besuner,Florian Beutler,Chris Blake,Hannes Bleuler,Michael Blomqvist,Robert Blum,Adam S. Bolton,Cesar Briceno,David J. Brooks,Joel R. Brownstein,E. Buckley-Geer,Angela Burden,Etienne Burtin,Nicolás G. Busca,Robert N. Cahn,Yan-Chuan Cai,Laia Cardiel-Sas,Raymond G. Carlberg,P. H. Carton,Ricard Casas,Francisco J. Castander,Jorge L. Cervantes-Cota,Todd M. Claybaugh,Madeline Close,Carl T. Coker,Shaun Cole,Johan Comparat,Andrew Cooper,M. C. Cousinou,Martin Crocce,Jean-Gabriel Cuby,Daniel P. Cunningham,Tamara M. Davis,Kyle S. Dawson,Axel de la Macorra,Juan de Vicente,Timothée Delubac,Mark Derwent,Arjun Dey,G. Dhungana,Zhejie Ding,Peter Doel,Yutong Duan,Anne Ealet,Jerry Edelstein,Sarah Eftekharzadeh,Daniel J. Eisenstein,Ann Elliott,Stephanie Escoffier,Matthew Evatt,Parker Fagrelius,Xiaohui Fan,Kevin Fanning,Arya Farahi,Jay Farihi,Ginevra Favole,Yu Feng,Enrique Fernández,Joseph R. Findlay,Douglas P. Finkbeiner,J. Michael Fitzpatrick,B. Flaugher,Samuel Flender,Andreu Font-Ribera,Jaime E. Forero-Romero,Pablo Fosalba,Carlos S. Frenk,Michele Fumagalli,Boris T. Gaensicke,Giuseppe Gallo,Juan Garcia-Bellido,Enrique Gaztanaga,Nicola Pietro Gentile Fusillo,Terry Gerard,Irena Gershkovich,Tommaso Giannantonio,Denis Gillet,Guillermo Gonzalez-de-Rivera,Violeta Gonzalez-Perez,Shelby Gott,Or Graur,G. Gutierrez,Julien Guy,Salman Habib,H. Heetderks,Ian Heetderks,Katrin Heitmann,Wojciech A. Hellwing,David Herrera,Shirley Ho,Stephen T. Holland,K. Honscheid,E. M. Huff,Timothy A. Hutchinson,Dragan Huterer,Ho Seong Hwang,Joseph Maria Illa Laguna,Yuzo Ishikawa,Dianna Jacobs,Niall Jeffrey,Patrick Jelinsky,Elise Jennings,Linhua Jiang,Jorge Jiménez,Jennifer A. Johnson,Richard Joyce,Eric Jullo,Stéphanie Juneau,Sami Kama,Armin Karcher,S. Karkar,Robert Kehoe,Noble Kennamer,Stephen B. H. Kent,Martin Kilbinger,Alex G. Kim,D. Kirkby,Theodore Kisner,Ellie Kitanidis,Jean-Paul Kneib,Sergey E. Koposov,Eve Kovacs,Kazuya Koyama,A. Kremin,Richard G. Kron,Luzius Kronig,Andrea Kueter-Young,Cedric G. Lacey,R. Lafever,Ofer Lahav,A. Lambert,Michael Lampton,Martin Landriau,Dustin Lang,Tod R. Lauer,Jean-Marc Le Goff,Laurent Le Guillou,Auguste Le Van Suu,Jae Hyeon Lee,Su-Jeong Lee,Daniela Leitner,Michael Lesser,Michael Levi,Benjamin L'Huillier,Baojiu Li,Ming Liang,Huan Lin,Eric V. Linder,Sarah Loebman,Zarija Lukić,Jun Ma,Niall MacCrann,Christophe Magneville,Laleh Makarem,Marc Manera,Christopher J. Manser,Robert Marshall,Paul Martini,Richard Massey,Thomas Matheson,Jeremy McCauley,Patrick McDonald,Ian D. McGreer,Aaron Meisner,Nigel Metcalfe,Timothy N. Miller,Ramon Miquel,John Moustakas,Adam D. Myers,Milind Naik,Jeffrey A. Newman,Robert C. Nichol,Andrina Nicola,Luiz Nicolati da Costa,Jundan Nie,Gustavo Niz,Peder Norberg,Brian Nord,Dara Norman,Peter Nugent,Thomas P. O'Brien,Minji Oh,Knut Olsen,Cristobal Padilla,Hamsa Padmanabhan,Nikhil Padmanabhan,Nathalie Palanque-Delabrouille,Antonella Palmese,Daniel Pappalardo,Isabelle Pâris,Changbom Park,Anna Patej,John A. Peacock,Hiranya V. Peiris,Xiyan Peng,Will J. Percival,S. Perruchot,Matthew M. Pieri,Richard W. Pogge,Jennifer E. Pollack,Claire Poppett,Francisco Prada,Abhishek Prakash,Ronald G. Probst,David Rabinowitz,Anand Raichoor,Chang H. Ree,Alexandre Refregier,X. Regal,Beth Reid,Kevin Reil,Mehdi Rezaie,Constance M. Rockosi,Natalie A. Roe,Samuel Ronayette,A. Roodman,Ashley J. Ross,Nicholas P. Ross,Graziano Rossi,Eduardo Rozo,V. Ruhlmann-Kleider,Eli S. Rykoff,Cristiano G. Sabiu,Lado Samushia,E. J. Sanchez,Javier Sanchez,David J. Schlegel,Michael Schneider,Michael Schubnell,A. Secroun,Uroš Seljak,Hee-Jong Seo,Santiago Serrano,Arman Shafieloo,Huanyuan Shan,Ray M. Sharples,Michael Sholl,William V. Shourt,Joseph H. Silber,David R. Silva,Martin M. Sirk,Anze Slosar,Alex Smith,George F. Smoot,Debopam Som,Yong-Seon Song,David Sprayberry,Ryan Staten,A. Stefanik,Gregory Tarlé,Suk Sien Tie,Jeremy L. Tinker,Rita Tojeiro,Francisco Valdes,Octavio Valenzuela,Monica Valluri,Mariana Vargas-Magaña,Licia Verde,Alistair R. Walker,Jiali Wang,Yuting Wang,Benjamin A. Weaver,Curtis Weaverdyck,Risa H. Wechsler,David H. Weinberg,Martin White,Qian Yang,Christophe Yèche,Tianmeng Zhang,Gong-Bo Zhao,Yi Zheng,Xu Zhou,Zhimin Zhou,Yaling Zhu,Hu Zou,Ying Zu +291 more
TL;DR: DESI as discussed by the authors is a ground-based dark energy experiment that will study baryon acoustic oscillations (BAO) and the growth of structure through redshift-space distortions with a wide-area galaxy and quasar redshift survey.
Journal ArticleDOI
Cosmological tests of modified gravity.
TL;DR: A review of the progress in the construction of modified gravity models as alternatives to dark energy as well as the development of cosmological tests of gravity can be found in this paper.
Journal ArticleDOI
Cosmological Tests of Modified Gravity
TL;DR: An overview of recent developments in modified gravity theories including f(R) gravity, braneworld gravity, Horndeski theory and massive/bigravity theory is given and how to test modifications of gravity on cosmological scales is discussed.
Journal ArticleDOI
Dynamical dark energy in light of the latest observations
Gong-Bo Zhao,Gong-Bo Zhao,Marco Raveri,Marco Raveri,Levon Pogosian,Levon Pogosian,Yuting Wang,Yuting Wang,Robert Crittenden,Will Handley,Will J. Percival,Florian Beutler,Jonathan Brinkmann,Chia-Hsun Chuang,Chia-Hsun Chuang,Antonio J. Cuesta,Antonio J. Cuesta,Daniel J. Eisenstein,Francisco-Shu Kitaura,Francisco-Shu Kitaura,Kazuya Koyama,Benjamin L'Huillier,Robert C. Nichol,Matthew M. Pieri,Sergio Rodríguez-Torres,Sergio Rodríguez-Torres,Ashley J. Ross,Ashley J. Ross,Graziano Rossi,Ariel G. Sánchez,Arman Shafieloo,Jeremy L. Tinker,Rita Tojeiro,Jose Alberto Vazquez,Hanyu Zhang +34 more
TL;DR: In this article, the authors investigated whether these tensions can be interpreted as evidence for a non-constant dynamical dark energy and found that the tensions are relieved by an evolving dark energy model preferred at a 3.5σ significance level based on the improvement in the fit alone.