☆ 4.6 Article

Two loop neutrino model and dark matter particles with global B - L symmetry

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS (2014)

期刊

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS

卷 -, 期 6, 页码 -

出版社

IOP Publishing Ltd

DOI: 10.1088/1475-7516/2014/06/027

关键词

dark matter theory; neutrino theory

类别

Astronomy & Astrophysics Physics, Particles & Fields

资金

NRF [2012R1A2A1A01006053]
European ITN project [FP7-PEOPLE-2011-ITN, PITN-GA-2011-289442-INVISIBLES]
National Research Foundation of Korea [2013-00000004, 2012R1A2A1A01006053] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

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摘要

We study a two loop induced seesaw model with global U(1)(B-L) symmetry, in which we consider two component dark matter particles. The dark matter properties are investigated together with some phenomenological constraints such as electroweak precision test, neutrino masses and mixing and lepton flavor violation. In particular, the mixing angle between the Standard Model like Higgs and an extra Higgs is extremely restricted by the direct detection experiment of dark matter. We also discuss the contribution of Goldstone boson to the effective number of neutrino species Delta N-eff approximate to 0.39 which has been reported by several experiments.

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Leucine and Glutamic Acid as a Biomarker of Sarcopenic Risk in Japanese People with Type 2 Diabetes

Hanako Nakajima, Hiroshi Okada, Ayaka Kobayashi, Fuyuko Takahashi, Takuro Okamura, Yoshitaka Hashimoto, Naoko Nakanishi, Takafumi Senmaru, Emi Ushigome, Masahide Hamaguchi, Michiaki Fukui

Summary: This study aimed to identify the serum metabolites associated with sarcopenic risk in Japanese patients with type 2 diabetes. The relationship between dietary protein intake and the metabolites concerning sarcopenia was analyzed, and the factors affecting sarcopenic risk were clarified. Leucine and glutamic acid were found to be useful biomarkers for sarcopenia.

NUTRIENTS (2023)

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Article Physics, Particles & Fields

Sterile neutrino dark matter: relativistic freeze-out

Oleg Lebedev, Takashi Toma

Summary: This study examines the role of long-lived sterile neutrinos as dark matter in the universe. It investigates the possibility of these neutrinos forming a thermal bath with a singlet scalar while not being in thermal equilibrium with Standard Model fields. The research finds that the neutrino dark matter undergoes freeze-out in the dark sector, with relativistic freeze-out occurring in only a small part of the parameter space. Unlike the standard weakly-interacting-massive-particle (WIMP) scenario, the allowed dark matter masses can extend up to 10^4 TeV without conflicting with perturbativity.

JOURNAL OF HIGH ENERGY PHYSICS (2023)

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Article Physics, Particles & Fields

Phenomenological and cosmological implications of a scotogenic three-loop neutrino mass model

Asmaa Abada, Nicolas Bernal, Antonio E. Carcamo E. Hernandez, Sergey Kovalenko, Tessio B. de Melo, Takashi Toma

Summary: We propose a scotogenic model that generates neutrino masses through a three-loop seesaw. The model allows new particles to have masses at the TeV scale without fine-tuning the Yukawa couplings.

JOURNAL OF HIGH ENERGY PHYSICS (2023)

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Review Cardiac & Cardiovascular Systems

Eating Behaviors and Incident Cardiovascular Disease in Japanese People: The Population-Based Panasonic Cohort Study 14

Kimiko Sakai, Hiroshi Okada, Masahide Hamaguchi, Norihiro Nishioka, Yukiko Tateyama, Tomonari Shimamoto, Kazushiro Kurogi, Hiroaki Murata, Masato Ito, Taku Iwami, Michiaki Fukui

Summary: This retrospective cohort study aimed to investigate the association between diet behaviors and incident cardiovascular disease (CVD) in Japanese individuals. The results showed that skipping breakfast and fast eating were associated with the occurrence of cardiovascular events, especially in individuals with a BMI below 25.

CURRENT PROBLEMS IN CARDIOLOGY (2023)

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Article Endocrinology & Metabolism

Younger patients and low c-peptide immunoreactivity index but not nutritional states affect fasting blood ketone levels in Japanese with type 1 diabetes after sodium-glucose cotransporter 2 inhibitor administration

Hanako Nakajima, Hiroshi Okada, Yuta Yoshimura, Toru Tanaka, Goji Hasegawa, Kazuteru Mitsuhashi, Noriyuki Kitagawa, Takuro Okamura, Yoshitaka Hashimoto, Takafumi Senmaru, Emi Ushigome, Naoko Nakanishi, Masahiro Yamazaki, Masahide Hamaguchi, Michiaki Fukui

Summary: This study aimed to evaluate the risk of ketosis in individuals with type 1 diabetes taking SGLT2 inhibitors, and to investigate the relationship between nutritional assessment, glycemic status, CPR index, and body composition. The results showed that younger age and a low ratio of basal to bolus insulin were associated with an increased risk of ketosis after taking SGLT2 inhibitors.

DIABETES OBESITY & METABOLISM (2023)

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Article Endocrinology & Metabolism

Effects of dapagliflozin on renal function in type 1 diabetes patients in the real world: A retrospective multicenter study of the KAMOGAWA-A cohort

Junya Hironaka, Hiroshi Okada, Masahide Hamaguchi, Kimiko Sakai, Megumi Minamida, Yuriko Kondo, Yoshitaka Hashimoto, Noriyuki Kitagawa, Miho Yano, Masahiro Yamazaki, Goji Hasegawa, Go Horiguchi, Satoshi Teramukai, Michiaki Fukui

Summary: This study aimed to investigate the effects of dapagliflozin on the renal function of type 1 diabetes patients. The results showed that after 24 months of dapagliflozin treatment, the decrease in estimated glomerular filtration rate (eGFR) was significantly smaller compared to the non-use group. Additionally, the dapagliflozin group also had lower levels of HbA1c, insulin dosage, and urinary albumin-to-creatinine ratio (UACR) changes compared to the non-use group.

DIABETES RESEARCH AND CLINICAL PRACTICE (2023)

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Article Physics, Particles & Fields

Semi-annihilating dark matter coupled with Majorons

Takumi Miyagi, Takashi Toma

Summary: This study presents a model based on the global U(1)(B-L) symmetry, describing the core formation of dark matter halos through semi-annihilation and the box-shaped neutrino spectrum generated by the decay of the Majoron.

JOURNAL OF HIGH ENERGY PHYSICS (2022)

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Article Astronomy & Astrophysics

Distinctive signals of boosted dark matter from its semiannihilation

Takashi Toma

Summary: This study demonstrates that the boosted dark matter produced by the semiannihilation process can be detected using future large volume neutrino detectors. The distinctive signals it produces differ from those of other semiannihilation and standard dark matter annihilation processes.

PHYSICAL REVIEW D (2022)

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