Zobrazeno 1 - 10
of 53
pro vyhledávání: '"Akitsu, Kazuyuki"'
Autor:
Akitsu, Kazuyuki
The galaxy bias parameters are crucial for modeling the large-scale structure in cosmology, yet uncertainties in these parameters often degrade the precision of cosmological constraints. In this work, we investigate how different Halo Occupation Dist
Externí odkaz:
http://arxiv.org/abs/2410.08998
Determining the spatial curvature ($\Omega_k$) independent of cosmic microwave background observations plays a key role in revealing the physics of the early universe. The Hubble tension is one of the most serious issues in modern cosmology. We inves
Externí odkaz:
http://arxiv.org/abs/2410.02524
Autor:
Collaboration, Beyond-2pt, Krause, Elisabeth, Kobayashi, Yosuke, Salcedo, Andrés N., Ivanov, Mikhail M., Abel, Tom, Akitsu, Kazuyuki, Angulo, Raul E., Cabass, Giovanni, Contarini, Sofia, Cuesta-Lazaro, Carolina, Hahn, ChangHoon, Hamaus, Nico, Jeong, Donghui, Modi, Chirag, Nguyen, Nhat-Minh, Nishimichi, Takahiro, Paillas, Enrique, Ibañez, Marcos Pellejero, Philcox, Oliver H. E., Pisani, Alice, Schmidt, Fabian, Tanaka, Satoshi, Verza, Giovanni, Yuan, Sihan, Zennaro, Matteo
The last few years have seen the emergence of a wide array of novel techniques for analyzing high-precision data from upcoming galaxy surveys, which aim to extend the statistical analysis of galaxy clustering data beyond the linear regime and the can
Externí odkaz:
http://arxiv.org/abs/2405.02252
Autor:
Cabass, Giovanni, Philcox, Oliver H. E., Ivanov, Mikhail M., Akitsu, Kazuyuki, Chen, Shi-Fan, Simonović, Marko, Zaldarriaga, Matias
Massive particles leave imprints on primordial non-Gaussianity via couplings to the inflaton, even despite their exponential dilution during inflation: practically, the Universe acts as a Cosmological Collider. We present the first dedicated search f
Externí odkaz:
http://arxiv.org/abs/2404.01894
Primordial magnetic fields (PMFs) are one of the plausible candidates for the origin of the observed large-scale magnetic fields. While many proposals have been made for the generation mechanism of PMFs by earlier studies, it remains a subject of deb
Externí odkaz:
http://arxiv.org/abs/2312.16316
Understanding the nonlinear relation between the shapes of halos or galaxies and the surrounding matter distribution is essential in accurate modeling of their intrinsic alignments. In the perturbative treatment, such nonlinear relation of the intrin
Externí odkaz:
http://arxiv.org/abs/2306.00969
Publikováno v:
JCAP08(2023)013
As well as the galaxy number density and peculiar velocity, the galaxy intrinsic alignment can be used to test the cosmic isotropy. We study distinctive impacts of the isotropy breaking on the configuration-space two-point correlation functions (2PCF
Externí odkaz:
http://arxiv.org/abs/2303.10890
Observational searches for large-scale vorticity modes in the late time Universe are underexplored. Within the standard $\Lambda$CDM model, this is well motivated given the observed properties of the cosmic microwave background (CMB). However, this m
Externí odkaz:
http://arxiv.org/abs/2301.11344
Autor:
Rogers, Keir K., Hložek, Renée, Laguë, Alex, Ivanov, Mikhail M., Philcox, Oliver H. E., Cabass, Giovanni, Akitsu, Kazuyuki, Marsh, David J. E.
Publikováno v:
JCAP 06 (2023) 023
We search for ultra-light axions as dark matter (DM) and dark energy particle candidates, for axion masses $10^{-32}\,\mathrm{eV} \leq m_\mathrm{a} \leq 10^{-24}\,\mathrm{eV}$, by a joint analysis of cosmic microwave background (CMB) and galaxy clust
Externí odkaz:
http://arxiv.org/abs/2301.08361
Autor:
Arai, Shun, Aoki, Katsuki, Chinone, Yuji, Kimura, Rampei, Kobayashi, Tsutomu, Miyatake, Hironao, Yamauchi, Daisuke, Yokoyama, Shuichiro, Akitsu, Kazuyuki, Hiramatsu, Takashi, Hirano, Shin'ichi, Kase, Ryotaro, Katsuragawa, Taishi, Kobayashi, Yosuke, Namikawa, Toshiya, Nishimichi, Takahiro, Okumura, Teppei, Shiraishi, Maresuke, Shirasaki, Masato, Sunayama, Tomomi, Takahashi, Kazufumi, Taruya, Atsushi, Tokuda, Junsei
Since the discovery of the accelerated expansion of the present Universe, significant theoretical developments have been made in the area of modified gravity. In the meantime, cosmological observations have been providing more high-quality data, allo
Externí odkaz:
http://arxiv.org/abs/2212.09094