Dynamical Dark Energy in light of the DESI DR2 Baryonic Acoustic Oscillations Measurements

Authors: Gu, Gan, Wang, Xiaoma, Wang, Yuting, Zhao, Gong-Bo, Pogosian, Levon, Koyama, Kazuya, Peacock, John A., Cai, Zheng, Cervantes-Cota, Jorge L., Zhao, Ruiyang, Ahlen, Steven, Bianchi, Davide, Brooks, David, Claybaugh, Todd, Cole, Shaun, de la Macorra, Axel, de Mattia, Arnaud, Doel, Peter, Ferraro, Simone, Forero-Romero, Jaime E., Gaztañaga, Enrique, Gontcho, Satya Gontcho A, Gutierrez, Gaston, Hahn, ChangHoon, Howlett, Cullan, Ishak, Mustapha, Kehoe, Robert, Kirkby, David, Kneib, Jean-Paul, Lahav, Ofer, Landriau, Martin, Guillou, Laurent Le, Leauthaud, Alexie, Levi, Michael, Manera, Marc, Meisner, Aaron, Miquel, Ramon, Moustakas, John, Muñoz-Gutiérrez, Andrea, Nadathur, Seshadri, Newman, Jeffrey A., Palanque-Delabrouille, Nathalie, Percival, Will, Prada, Francisco, Pérez-Ràfols, Ignasi, Rossi, Graziano, Samushia, Lado, Sanchez, Eusebio, Schlegel, David, Seo, Hee-Jong, Shafieloo, Arman, Sprayberry, David, Tarlé, Gregory, Walther, Michael, Weaver, Benjamin Alan, Zarrouk, Pauline, Zhao, Cheng, Zhou, Rongpu, Zou, Hu

Subject Terms: Astrophysics - Cosmology and Nongalactic Astrophysics

Access URL: http://arxiv.org/abs/2504.06118

Forecasts for interacting dark energy with time-dependent momentum exchange

Authors: Cruickshank, Nathan, Crittenden, Robert, Koyama, Kazuya, Bruni, Marco

Subject Terms: Astrophysics - Cosmology and Nongalactic Astrophysics

Access URL: http://arxiv.org/abs/2504.03555

A cosmological full-shape power spectra analysis using pre- and post-reconstructed density fields

Authors: Zhang, Weibing, Zhao, Ruiyang, Mu, Xiaoyong, Koyama, Kazuya, Takahashi, Ryuichi, Wang, Yuting, Zhao, Gong-Bo

Subject Terms: Astrophysics - Cosmology and Nongalactic Astrophysics

Access URL: http://arxiv.org/abs/2503.20574

Limited-angle SPECT image reconstruction using deep image prior

Authors: Hori, Kensuke, Hashimoto, Fumio, Koyama, Kazuya, Hashimoto, Takeyuki

Subject Terms: Physics - Medical Physics, Electrical Engineering and Systems Science - Image and Video Processing

Access URL: http://arxiv.org/abs/2503.18342

Fast Generation of Weak Lensing Maps in Modified Gravity with COLA

Authors: Hoyland, Sophie, Winther, Hans A., Saadeh, Daniela, Koyama, Kazuya, Izard, Albert

Subject Terms: Astrophysics - Cosmology and Nongalactic Astrophysics, General Relativity and Quantum Cosmology

Access URL: http://arxiv.org/abs/2502.14851

Measuring the redshift-space distortions by cross-correlating the density fields before and after reconstruction

Authors: Zhang, Weibing, Zhao, Ruiyang, Mu, Xiaoyong, Koyama, Kazuya, Takahashi, Ryuichi, Wang, Yuting, Zhao, Gong-Bo

Subject Terms: Astrophysics - Cosmology and Nongalactic Astrophysics

Access URL: http://arxiv.org/abs/2502.08186

Modelling the covariance matrix for the power spectra before and after the BAO reconstruction

Authors: Zhao, Ruiyang, Koyama, Kazuya, Wang, Yuting, Zhao, Gong-Bo

Subject Terms: Astrophysics - Cosmology and Nongalactic Astrophysics

Access URL: http://arxiv.org/abs/2410.18524

Stochastic inflation beyond slow roll: noise modelling and importance sampling

Authors: Jackson, Joseph H. P., Assadullahi, Hooshyar, Gow, Andrew D., Koyama, Kazuya, Vennin, Vincent, Wands, David

Source: JCAP 04 (2025) 073

Subject Terms: Astrophysics - Cosmology and Nongalactic Astrophysics, General Relativity and Quantum Cosmology

Access URL: http://arxiv.org/abs/2410.13683

Efficient Compression of Redshift-Space Distortion Data for Late-Time Modified Gravity Models

Authors: Toda, Yo, Gómez-Valent, Adrià, Koyama, Kazuya

Subject Terms: Astrophysics - Cosmology and Nongalactic Astrophysics, General Relativity and Quantum Cosmology

Access URL: http://arxiv.org/abs/2408.16388

Testing screened modified gravity with SDSS-IV-MaNGA

Authors: Landim, Ricardo G., Desmond, Harry, Koyama, Kazuya, Penny, Samantha

Source: MNRAS 534, 349-360 (2024)

Subject Terms: Astrophysics - Cosmology and Nongalactic Astrophysics, Astrophysics - Astrophysics of Galaxies, General Relativity and Quantum Cosmology

Access URL: http://arxiv.org/abs/2407.08825

Extending MGCAMB tests of gravity to nonlinear scales

Authors: Wang, Zhuangfei, Saadeh, Daniela, Koyama, Kazuya, Pogosian, Levon, Bose, Benjamin, Yi, Lanyang, Zhao, Gong-Bo

Subject Terms: Astrophysics - Cosmology and Nongalactic Astrophysics

Access URL: http://arxiv.org/abs/2406.09204

A field-level emulator for modified gravity

Authors: Saadeh, Daniela, Koyama, Kazuya, Morice-Atkinson, Xan

Source: MNRAS 537, 448 (2025)

Subject Terms: Astrophysics - Cosmology and Nongalactic Astrophysics, General Relativity and Quantum Cosmology

Access URL: http://arxiv.org/abs/2406.03374

Theory of interacting vector dark energy and fluid

Authors: Pookkillath, Masroor C., Koyama, Kazuya

Source: JCAP10(2024)105

Subject Terms: General Relativity and Quantum Cosmology, Astrophysics - Cosmology and Nongalactic Astrophysics, High Energy Physics - Theory

Access URL: http://arxiv.org/abs/2405.06565

Modeling nonlinear scales with COLA: preparing for LSST-Y1

Authors: Gordon, Jonathan, de Aguiar, Bernardo F., Rebouças, João, Brando, Guilherme, Falciano, Felipe, Miranda, Vivian, Koyama, Kazuya, Winther, Hans A.

Subject Terms: Astrophysics - Cosmology and Nongalactic Astrophysics, General Relativity and Quantum Cosmology

Access URL: http://arxiv.org/abs/2404.12344

Cosmological constraints on early dark energy from the full shape analysis of eBOSS DR16

Authors: Gsponer, Rafaela, Zhao, Ruiyang, Donald-McCann, Jamie, Bacon, David, Koyama, Kazuya, Crittenden, Robert, Simon, Theo, Mueller, Eva-Maria

Subject Terms: Astrophysics - Cosmology and Nongalactic Astrophysics

Access URL: http://arxiv.org/abs/2312.01977

Emulating power spectra for pre- and post-reconstructed galaxy samples

Authors: Wang, Yuting, Zhao, Ruiyang, Zhai, Zhongxu, Koyama, Kazuya, Percival, Will J., Guo, Hong, Li, Yin, Zhao, Gong-Bo, Nishimichi, Takahiro, Gil-Marín, Héctor, Feng, Yonghao, Zhang, Hanyu, Wu, Yi

Subject Terms: Astrophysics - Cosmology and Nongalactic Astrophysics

Access URL: http://arxiv.org/abs/2311.05848

The separate-universe approach and sudden transitions during inflation

Authors: Jackson, Joseph H. P., Assadullahi, Hooshyar, Gow, Andrew D., Koyama, Kazuya, Vennin, Vincent, Wands, David

Subject Terms: Astrophysics - Cosmology and Nongalactic Astrophysics

Access URL: http://arxiv.org/abs/2311.03281

Fast production of cosmological emulators in modified gravity: the matter power spectrum

Authors: Fiorini, Bartolomeo, Koyama, Kazuya, Baker, Tessa

Subject Terms: Astrophysics - Cosmology and Nongalactic Astrophysics, General Relativity and Quantum Cosmology

Access URL: http://arxiv.org/abs/2310.05786

A multitracer analysis for the eBOSS galaxy sample based on the effective field theory of large-scale structure

Authors: Zhao, Ruiyang, Mu, Xiaoyong, Gsponer, Rafaela, Donald-McCann, Jamie, Feng, Yonghao, Zhang, Weibing, Wang, Yuting, Zhao, Gong-Bo, Koyama, Kazuya, Bacon, David, Crittenden, Robert G.

Subject Terms: Astrophysics - Cosmology and Nongalactic Astrophysics

Access URL: http://arxiv.org/abs/2308.06206

Analysis of Unified Galaxy Power Spectrum Multipole Measurements

Authors: Donald-McCann, Jamie, Gsponer, Rafaela, Zhao, Ruiyang, Koyama, Kazuya, Beutler, Florian

Subject Terms: Astrophysics - Cosmology and Nongalactic Astrophysics

Access URL: http://arxiv.org/abs/2307.07475