The NAOJ Division of Science Cosmology Group

Journal Club (NAOJ-Cosmo)

国立天文台科学研究部宇宙論・文献紹介

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· 7/14/2025 (Mon) 16:00 --, 313

Takeshi Hamana, “TBA”

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· 6/30/2025 (Mon) 16:00 --, 313

Maria Giovanna Dainotti, “TBA”

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· 5/19/2025 (Mon) 16:00 --, 313

Shubham Bhardwaj, “TBA”

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· 5/12/2025 (Mon) 16:00 --, 313

Toya Suzuki, “TBA”

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· 4/14/2025 (Mon) 16:00 --, 313

Kazunori Kohri, “TBA”

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· 3/24/2025 (Mon) 16:00 --, 313

Arnab Chaudhuri, “TBA”

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· 3/17/2025 (Mon) 16:00 --, Zoom online (Zoom1)

Satyabrata Mahapatra (Sungkyunkwan University, Korea)

Title: Exploring the Dark Sector: Self-Interactions, Baryogenesis, and Cosmological Tensions

Abstract: In this talk, I will discuss novel approaches to addressing key cosmological challenges through innovative dark sector models. I will present an asymmetric self-interacting dark matter framework within canonical seesaw models, which simultaneously generates dark matter and baryon asymmetry while alleviating small-scale structure issues. This model predicts a long lived dark matter with strict limits on dark matter mass and offers verifiable signatures in various experiments. I will then explore a scenario where light thermal dark matter is revived through a first-order phase transition, enhancing direct detection prospects and predicting stochastic gravitational waves detectable by pulsar timing arrays. Finally, I will introduce a comprehensive U(1)_D framework featuring inelastic dark matter coupled with self-interacting dark radiation, which addresses multiple cosmological tensions, including the Hubble tension, S8 tension, and Lyman-α discrepancies. This model incorporates unique features such as fluid-like dark radiation behavior and a distinct temperature dependence for dark matter-dark radiation interactions, offering a unified solution to long-standing problems in cosmology.

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· 2/10/2025 (Mon) 16:00 --, 313

Takeshi Hamana,

https://arxiv.org/abs/2501.10506

https://arxiv.org/abs/2501.19117

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· 1/27/2025 (Mon) 16:00 --, 313

Maria Giovanna Dainotti,

Title: A New Master Supernovae Ia sample and the investigation of the H0 tension”

Abstract:

Modern cosmological research still thoroughly debates the discrepancy between local probes and the Cosmic Mi crowave Background observations in the Hubble constant (H0) measurements, ranging from 4σ to 6σ. In the cur rent study we examine this tension using the Supernovae Ia (SNe Ia) data from the Pantheon, PantheonPlus, Joint Lightcurve Analysis (JLA), and Dark Energy Survey (DES) catalogs together with their combination called Master Sample containing 3789 SNe Ia, and dividing all of them into redshift-ordered bins. Two main binning techniques are presented: the equipopulation and the equispace in the log z. We perform a Markov-Chain Monte Carlo analysis (MCMC) for each bin to determine the H0 value, estimating it within the standard flat ΛCDM and the w0waCDM models. These H0 values are then fitted with the following phenomenological function: H0(z) = ˜ H0/(1 + z)α, where ˜ H0 is a free parameter representing H0(z) fitted at z = 0, and α is the evolutionary parameter. Our results indicate a decreasing trend characterized by α ∼ 0.01 whose consistency with zero range from 1.00σ at 3 bins in the Pantheon sample with the w0waCDM model to ≥ 6σ at 12 bins with the JLA and DES samples within the ΛCDM model. Such a trend in the SNe Ia catalogs could be due to evolution with redshift for the SNe Ia astrophysical variables or unveiled selection biases. Alternatively, intrinsic physics, possibly the f(R) theory of gravity, could be responsible for this trend.

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· 12/16/2024 (Mon) 16:30 --1730, 313/Zoom (email to Maria Dainotti about the URL)

Xavier Jason Prochawska, “Recent Progress on Cosmological Constraints with Fast Radio Bursts"”

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· 11/25/2024 (Mon) 16:00 --, 313

Albert Escriva, “Non-spherical effects on the mass function of Primordial Black Holes / Simulations of Ellipsoidal Primordial Black Hole Formation”

Albert Escrivà, Chul-Moon Yoo, arXiv: 2410.03451 [gr-qc]

https://arxiv.org/abs/2410.03451

Albert Escrivà, Chul-Moon Yoo, arXiv:2410.03452 [gr-qc]

https://arxiv.org/abs/2410.03452

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· 11/11/2024 (Mon) 16:00 --, 313

Toya Suzuki, “Evolution of the DM distribution function in the density spikes
around PBHs”, arXiv: 2407.10225

https://arxiv.org/abs/2407.10225

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· 10/7/2024 (Mon) 17:00 --, Zoom

Shubham Bhardwaj, “Constraining burdened PBHs with

gravitational waves”, arXiv:2409.05953v2

https://arxiv.org/abs/2409.05953v2

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· 8/26/2024 (Mon) 16:00 --, Lecture Room

Chia-Min Lin (National Chin-Yi University of Technology, Taiwan),

Title: “Quantum cosmology and uniform rate inflation”

Abstract:

In this talk, I will be unveiling an analytical solution of the Wheeler-DeWitt equation in a flat FLRW minisuperspace, and discuss it in de Broglie-Bohm quantum cosmology. This solution is the foundation for an inflation model, the uniform rate inflation. I will also share this novel model's experimental predictions and generalizations in braneworld cosmology.

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· 7/22/2024 (Mon) 16:00 --, Lecture room

Arnab Chaudhuri, “Review of Memory Burden Effects”

1) Valentin Thoss, Andreas Burkert, Kazunori Kohri,

arXiv: 2402.17823

https://arxiv.org/abs/2402.17823

2) Basabendu Barman, Md Riajul Haque, Óscar Zapata, arXiv:2405.15858 [astro-ph.CO]

https://arxiv.org/abs/2405.15858

3) Gia Dvali, Lukas Eisemann, Marco Michel, Sebastian Zell, arXiv:2006.00011 [hep-th]

https://arxiv.org/abs/2006.00011

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· 7/8/2024 (Mon) 16:00 --, Lecture room

Naonori Sugiyama, “3Dx2D?”

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· 7/1/2024 (Mon) 16:00 --, Lecture room

Takeshi Kobayashi (SISSA, Italy), “Monopoles and Cosmic Magnetic Fields”

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· 6/24/2024 (Mon) 16:00 --

Maria Dainotti, “A new parametrization for w₀, w_a, CDM model to alleviate the Hubble constant tension?”

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· 5/24/2024 (Mon) 16:00 --

Takashi Hamana, “Hubble Tension”

1) A new method to determine H0 from cosmological energy-density measurements

Alex Krolewski, Will J. Percival, Alex Woodfinden

https://arxiv.org/abs/2403.19227

2) Measuring the baryon fraction using galaxy clustering,

Alex Krolewski, Will J. Percival

https://arxiv.org/abs/2403.19236

3) A too-many dwarf galaxy satellites problem in the M83 group,

Oliver Müller, Marcel S. Pawlowski, Yves Revaz, Aku Venhola, Marina Rejkuba, Michael Hilker, Katharina Lutz

https://arxiv.org/abs/2403.08717

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· 5/13/2024 (Mon) 15:00 --

Kazunori Kohri, DESI year 1 in terms of time-dependent dark energy and neutrino mass hierarchy

1) DESI Collaboration: A. G. Adame et al, arXiv:2404.03002 [astro-ph.CO]

https://arxiv.org/abs/2404.03002

2) https://data.desi.lbl.gov/public/papers/y1/DESI2024_VI_BAO_COSMOLOGY.pdf

3) Yuichiro Tada and Takahiro Terada, arXiv:2404.05722v2

https://arxiv.org/abs/2404.05722

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· 4/1/2024 (Mon) 15:00 --

Naonori Sugiyama, Video Files for presentation

1) Naonori S. Sugiyama, Daisuke Yamauchi, Tsutomu Kobayashi, Tomohiro Fujita, Shun Arai, Shin'ichi Hirano, Shun Saito, Florian Beutler, Hee-Jong Seo, arXiv:2305.01142 [astro-ph.CO]

https://arxiv.org/abs/2305.01142

YouTube

https://www.youtube.com/watch?v=Zi36ooLPhss&feature=youtu.be

2) Naonori S. Sugiyama,

https://arxiv.org/abs/2402.06142

YouTube

https://www.youtube.com/watch?v=u1-xx3_4xCg

3) Naonori S. Sugiyama,

https://arxiv.org/abs/2403.18262

YouTube

https://www.youtube.com/watch?v=bHdlIi3jQ4A&feature=youtu.be

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· 2/26/2024 (Mon) 13:00 --

Takashi Hamana, The SRG/eROSITA and cosmological tension of σ₈

1) https://arxiv.org/abs/2402.08458

2) A&A, vol. 682, A34 (2024), https://arxiv.org/abs/2401.17274

3) https://arxiv.org/abs/2402.08452

4) https://arxiv.org/abs/2402.08453

5) https://arxiv.org/abs/2402.08455

6) https://arxiv.org/abs/2402.08456

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· 1/29/2024 (Mon) 16:00 --

Kazunori Kohri

Parity violation in the Universe

1) Could Sample Variance be Responsible for the Parity-Violating Signal Seen in the BOSS Galaxy Survey?, Oliver H. E. Philcox, Julia Ereza, arXiv:2401.09523 [astro-ph.CO] https://arxiv.org/abs/2401.09523

2) Probing Parity-Violation with the Four-Point Correlation Function of BOSS Galaxies, Oliver H. E. Philcox, arXiv:2206.04227 [astro-ph.CO] https://arxiv.org/abs/2206.04227

3) Planck constraints on Cosmic Birefringence and its cross-correlation with the CMB, G. Zagatti, M. Bortolami, A. Gruppuso, P. Natoli, L. Pagano, G. Fabbian, rXiv:2401.11973 [astro-ph.CO]rXiv:2401.11973 [astro-ph.CO] https://arxiv.org/abs/2401.11973

4) Deuterium D/H Measurement in the metal-poor sub-DLA system at 𝑧 = 3.42 towards quasar J 1332+0052, P.A. Kislitsyn, S.A. Balashev, M.T. Murphy, C. Ledoux, P. Noterdaeme, A.V. Ivanchik, arXiv:2401.12797 [astro-ph.CO] https://arxiv.org/abs/2401.12797

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· 11/28/2023 (Fri) 15:00--

Naonori S. Sugiyama

1) First test of the consistency relation for the large-scale structure using the anisotropic three-point correlation function of BOSS DR12 galaxies

(An explanatory video is available at https://youtu.be/Zi36ooLPhss.)

2) Naonori S. Sugiyama, Daisuke Yamauchi, Tsutomu Kobayashi, Tomohiro Fujita, Shun Arai, Shin'ichi Hirano, Shun Saito, Florian Beutler, Hee-Jong

Seo https://arxiv.org/abs/2305.01142

3) Sugiyama, Shiraishi, Okumura https://arxiv.org/abs/1704.02868

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· 10/30/2023 (Mon) 15:00 --

Takashi Hamana

1) Enrique Paillas, et al, arxiv:2309.16541

https://arxiv.org/abs/2309.16541

2) Chi-Ting Chiang, Christian Wagner, Fabian Schmidt, Eiichiro Komatsu, 2014, JCAP, 05, 048

https://arxiv.org/abs/1403.3411

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· 10/23/2023 (Mon) 15:00 --

Kazunori Kohri

JWST and the early-universe cosmology

1) JWST‘s UV luminosity function is consistent with ΛCDM, Yi-Ying Wang, Lei Lei, Guan-Wen Yuan, Yi-Zhong Fan, arXiv:2307.12487 [astro-ph.GA], https://arxiv.org/abs/2307.12487

2) An inflation model for massive primordial black holes to interpret the JWST observations”, Bing-Yu Su, Nan Li, Lei Feng, arXiv:2306.05364 [astro-ph.CO] https://arxiv.org/abs/2306.05364

3) NANOGrav15yr, JWST’s early star formation and Hubble tension, Yann Gouttenoire, Sokratis Trifinopoulos, Georgios Valogiannis, Miguel Vanvlasselaer, arXiv:2307.01457 [astro-ph.CO] https://arxiv.org/abs/2307.01457

4) Primordial power spectrum in light of JWST observations of high redshift galaxies, Priyank Parashari, Ranjan Laha, arXiv:2305.00999 [astro-ph.CO]https://arxiv.org/abs/2305.00999

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問い合わせ先: 郡　和範 (こおり　かずのり)

Contact: Kazunori Kohri

https://sci.nao.ac.jp/main/member