1.

Revisiting the numbertheory dark matter scenario and the weak gravity conjecture
/ Nakayama, Kazunori ; Takahashi, Fuminobu ; Yanagida, Tsutomu T.
We revisit the numbertheory dark matter scenario where one of the light chiral fermions required by the anomaly cancellation conditions of U(1)BL explains dark matter. [...]
Published in Physics letters B 790 (2019) 218224
10.1016/j.physletb.2019.01.013
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2.

Flavon stabilization in models with discrete flavor symmetry
/ Chigusa, So ; Kasuya, Shinta ; Nakayama, Kazunori
We propose a simple mechanism for stabilizing flavon fields with aligned vacuum structure in models with discrete flavor symmetry. [...]
Published in Physics letters B 788 (2019) 494499
10.1016/j.physletb.2018.11.051
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3.

Anomalous discrete flavor symmetry and domain wall problem
/ Chigusa, So ; Nakayama, Kazunori
Discrete flavor symmetry is often introduced for explaining quark/lepton masses and mixings. [...]
Published in Physics letters B 788 (2019) 249255
10.1016/j.physletb.2018.11.027
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4.

Stochastic gravitational waves from particle origin
/ Nakayama, Kazunori ; Tang, Yong
We propose that there may be a substantial stochastic gravitational wave (GW) background from particle origin, mainly from the gravitational threebody decay of the inflaton. [...]
Published in Physics letters B 788 (2019) 341346
10.1016/j.physletb.2018.11.023
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5.

Production of purely gravitational dark matter
/ Ema, Yohei ; Nakayama, Kazunori ; Tang, Yong
In the purely gravitational dark matter scenario, the dark matter particle does not have any interaction except for gravitational one. [...]
Published in JHEP 1809 (2018) 135
10.1007/JHEP09(2018)135
arXiv:1804.07471
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6.

Axionphoton conversion and effects on 21 cm observation
/ Moroi, Takeo ; Nakayama, Kazunori ; Tang, Yong
Recently the EDGES experiment reported an enhanced 21 cm absorption signal in the radio wave observation, which may be interpreted as either anomalous cooling of baryons or heating of cosmic microwave background photons. [...]
Published in Physics letters B (2018)
10.1016/j.physletb.2018.07.002
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7.

Supersymmetric flaxion
/ Ema, Yohei ; Hagihara, Daisuke ; Hamaguchi, Koichi ; Moroi, Takeo ; et al
Recently, a new minimal extension of the Standard Model has been proposed, where a spontaneously broken, flavordependent global U(1) symmetry is introduced. [...]
Published in JHEP 1804 (2018) 094
10.1007/JHEP04(2018)094
arXiv:1802.07739
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8.

Gravitino problem in inflation driven by inflatonpolonyi Kähler coupling
/ Hasegawa, Fuminori ; Nakayama, Kazunori ; Terada, Takahiro ; Yamada, Yusuke
We discuss the cosmological gravitino problem in inflation models in which the inflaton potential is constructed from Kähler potential rather than superpotential: a representative model is D3‾ induced geometric inflation. [...]
Published in Physics letters B (2017)
10.1016/j.physletb.2017.12.038
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9.

Explosive axion production from saxion
/ Ema, Yohei ; Nakayama, Kazunori
The dynamics of saxion in a supersymmetric axion model and its effect on the axion production is studied in detail. [...]
Published in Physics letters B (2017)
10.1016/j.physletb.2017.11.035
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10.

Neutrino CP phases from sneutrino chaotic inflation
/ Nakayama, Kazunori ; Takahashi, Fuminobu ; Yanagida, Tsutomu T.
We study if the minimal sneutrino chaotic inflation is consistent with a flavor symmetry of the Froggatt–Nielsen type, to derive testable predictions on the Dirac and Majorana CP violating phases, δ and α . [...]
Published in Physics letters B (2017)
10.1016/j.physletb.2017.08.024
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