Zobrazeno 1 - 10
of 958
pro vyhledávání: '"Koyama, Kazuya"'
Autor:
Wang, Zhuangfei, Saadeh, Daniela, Koyama, Kazuya, Pogosian, Levon, Bose, Benjamin, Yi, Lanyang, Zhao, Gong-Bo
Modified Growth with CAMB (MGCAMB) is a patch for the Einstein-Boltzmann solver CAMB for cosmological tests of gravity. Until now, MGCAMB was limited to scales well-described by linear perturbation theory. In this work, we extend the framework with a
Externí odkaz:
http://arxiv.org/abs/2406.09204
Stage IV dark energy surveys such as the Vera C. Rubin Observatory and Euclid present a unique opportunity to shed light on the nature of dark energy. However, the full constraining power of the new data cannot be unlocked unless accurate predictions
Externí odkaz:
http://arxiv.org/abs/2406.03374
In this work, we study interaction between dark energy and dark matter, where dark energy is described by a massive vector field, and dark matter is modelled as a fluid. We present new interaction term, which affects only perturbations and can give i
Externí odkaz:
http://arxiv.org/abs/2405.06565
Autor:
Gordon, Jonathan, de Aguiar, Bernardo F., Rebouças, João, Brando, Guilherme, Falciano, Felipe, Miranda, Vivian, Koyama, Kazuya, Winther, Hans A.
Year 1 results of the Legacy Survey of Space and Time (LSST) will provide tighter constraints on small-scale cosmology, beyond the validity of linear perturbation theory. This heightens the demand for a computationally affordable prescription that ca
Externí odkaz:
http://arxiv.org/abs/2404.12344
Autor:
Gsponer, Rafaela, Zhao, Ruiyang, Donald-McCann, Jamie, Bacon, David, Koyama, Kazuya, Crittenden, Robert, Simon, Theo, Mueller, Eva-Maria
We evaluate the effectiveness of Early Dark Energy (EDE) in addressing the Hubble tension using data from the completed eBOSS survey, focusing on luminous red galaxies (LRGs), quasars (QSOs), and emission line galaxies (ELGs). We perform cosmological
Externí odkaz:
http://arxiv.org/abs/2312.01977
Autor:
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
The small-scale linear information in galaxy samples typically lost during non-linear growth can be restored to a certain level by the density field reconstruction, which has been demonstrated for improving the precision of the baryon acoustic oscill
Externí odkaz:
http://arxiv.org/abs/2311.05848
Autor:
Jackson, Joseph H. P., Assadullahi, Hooshyar, Gow, Andrew D., Koyama, Kazuya, Vennin, Vincent, Wands, David
The separate-universe approach gives an intuitive way to understand the evolution of cosmological perturbations in the long-wavelength limit. It uses solutions of the spatially-homogeneous equations of motion to model the evolution of the inhomogeneo
Externí odkaz:
http://arxiv.org/abs/2311.03281
We test the convergence of fast simulations based on the COmoving Lagrangian Acceleration (COLA) method for predictions of the matter power spectrum, specialising our analysis in the redshift range $1 \le z \le 1.65$, relevant to high-redshift spectr
Externí odkaz:
http://arxiv.org/abs/2310.05786
Autor:
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.
We perform a multitracer full-shape analysis in Fourier space based on the effective field theory of large-scale structure (EFTofLSS) using the complete Sloan Digital Sky Survey IV (SDSS-IV) extended Baryon Oscillation Spectroscopic Survey (eBOSS) DR
Externí odkaz:
http://arxiv.org/abs/2308.06206
We present a series of full-shape analyses of galaxy power spectrum multipole measurements from the 6dFGS, BOSS, and eBOSS galaxy surveys. We use an emulated effective field theory of large-scale structure (EFTofLSS) model to conduct these analyses.
Externí odkaz:
http://arxiv.org/abs/2307.07475