Refereed publications
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[52]''Stealth dark energy in scordatura DHOST theory'',[51]''On Rotating Black Holes in DHOST Theories'',Jibril Ben Achour, Hongguang Liu, Hayato Motohashi, Shinji Mukohyama, Karim Noui,
JCAP in press, [arXiv:2006.07245].[50]''General Relativity solutions with stealth scalar hair in quadratic higher-order scalar-tensor theories'',[49]''Effective Field Theory of Degenerate Higher-Order Inflation'',[48]''Ghost from constraints: a generalization of Ostrogradsky theorem'',[47]''Quantum Ostrogradsky theorem'',[46]''Primordial Black Holes as Dark Matter through Higgs Criticality'',[45]''Weakly-coupled stealth solution in scordatura degenerate theory'',[44]''Constant roll and primordial black holes'',[43]''Constant-roll inflation in scalar-tensor gravity'',[42]''Linear stability analysis of hairy black holes in quadratic degenerate higher-order scalar-tensor theories: Odd-parity perturbations'',Kazufumi Takahashi, Hayato Motohashi, Masato Minamitsuji,
Phys. Rev. D 100, 024041 (2019), [arXiv:1904.03554].[41]''Exact black hole solutions in shift-symmetric quadratic degenerate higher-order scalar-tensor theories'',[40]''Primordial Black Holes and Local Non-Gaussianity in Canonical Inflation'',[39]''Shape dependence of spontaneous scalarization'',[38]''Stealth Schwarzschild solution in shift symmetry breaking theories'',[37]''Ghost-free theories with arbitrary higher-order time derivatives'',[36]''General Relativity solutions in modified gravity'',[35]''Reconciling tensor and scalar observables in G-inflation'',Hector Ramirez, Samuel Passaglia, Hayato Motohashi, Wayne Hu, Olga Mena,
JCAP 1804 (2018) 04, 039, [arXiv:1802.04290].[34]''Ghost-free theory with third-order time derivatives'',Hayato Motohashi, Teruaki Suyama, Masahide Yamaguchi,
J.Phys.Soc.Jpn. 87, 063401 (2018), [arXiv:1711.08125].[33]''Primordial Black Holes and Slow-Roll Violation'',[32]''f(R) constant-roll inflation'',[31]''Generalized Slow Roll in the Unified Effective Field Theory of Inflation'',[30]''Constant-roll inflation: confrontation with recent observational data'',[29]''General invertible transformation and physical degrees of freedom'',Kazufumi Takahashi, Hayato Motohashi, Teruaki Suyama, Tsutomu Kobayashi,
Phys.Rev. D 95, 084053 (2017), [arXiv:1702.01849].[28]''Caustics for Spherical Waves'',[27]''Fundamental theorem on gauge fixing at the action level'',Hayato Motohashi, Teruaki Suyama, Kazufumi Takahashi,
Phys.Rev. D94, 124021 (2016), [arXiv:1608.00071].[26]''Healthy degenerate theories with higher derivatives'',Hayato Motohashi, Karim Noui, Teruaki Suyama, Masahide Yamaguchi, David Langlois,
JCAP 1607 (2016) 07, 033, [arXiv:1603.09355].[25]''Self-accelerating Massive Gravity: Hidden Constraints and Characteristics'',[24]''Nonlinear Excitations in Inflationary Power Spectra'',V. Miranda, Wayne Hu, Chen He, Hayato Motohashi,
Phys.Rev. D93 (2016) 2, 023504, [arXiv:1510.07580].[23]''Self-accelerating Massive Gravity: Superluminality, Cauchy Surfaces and Strong Coupling'',Pavel Motloch, Wayne Hu, Austin Joyce, Hayato Motohashi,
Phys.Rev. D92 (2015) 4, 044024, [arXiv:1505.03518].[22]''Disformal invariance of curvature perturbation'',[21]''Running from Features: Optimized Evaluation of Inflationary Power Spectra'',[20]''Inflation with a constant rate of roll'',Hayato Motohashi, Alexei A. Starobinsky, Jun'ichi Yokoyama,
JCAP 1509 (2015) 09, 018, [arXiv:1411.5021].[19]''Third-order equations of motion and the Ostrogradsky instability'',[18]''Consistency relation for Rp inflation'',[17]''Stability of cosmological solutions in extended quasidilaton massive gravity'',[16]''Black hole perturbation in the most general scalar-tensor theory with second-order field equations II: the even-parity sector'',Tsutomu Kobayashi, Hayato Motohashi, Teruaki Suyama,
Phys. Rev. D 89, 084042 (2014), [arXiv:1402.6740].[15]''Constraint on reheating after f(R) inflation from gravitational waves'',[14]''Langevin description of gauged scalar fields in a thermal bath'',Yuhei Miyamoto, Hayato Motohashi, Teruaki Suyama, Jun'ichi Yokoyama,
Phys. Rev. D 89, 085037 (2014), [arXiv:1308.4794].[13]''Cosmic string passage through the Earth by consequent global earthquake'',[12]''Ultra Slow-Roll Inflation and the non-Gaussianity Consistency Relation'',[11]''Consequences of a stochastic approach to the conformal invariance of inflationary correlators'',Hayato Motohashi, Teruaki Suyama, Jun'ichi Yokoyama,
Phys. Rev. D86 (2012) 123514, [arXiv:1210.2497].[10]''Self-accelerating solutions in massive gravity on an isotropic reference metric'',[9]''Reheating after f(R) inflation'',[8]''Cosmology Based on f(R) Gravity Admits 1 eV Sterile Neutrinos'',Hayato Motohashi, Alexei A. Starobinsky and Jun'ichi Yokoyama,
Phys. Rev. Lett. 110, 121302 (2013), [arXiv:1203.6828].[7]''Black hole perturbation in the most general scalar-tensor theory with second-order field equations I: the odd-parity sector'',Tsutomu Kobayashi, Hayato Motohashi, Teruaki Suyama,
Phys. Rev. D 85, 084025 (2012), Erratum: Phys.Rev. D96 (2017) no.10, 109903, [arXiv:1202.4893].[6]''Black hole perturbation in non-dynamical and dynamical Chern-Simons gravity'',[5]''Black hole perturbation in parity violating gravitational theories'',[4]''Future Oscillations around Phantom Divide in f(R) Gravity'',Hayato Motohashi, Alexei A. Starobinsky, Jun'ichi Yokoyama,
JCAP 1106 (2011) 006, [arXiv:1101.0744].[3]''Matter power spectrum in f(R) gravity with massive neutrinos'',Hayato Motohashi, Alexei A. Starobinsky, Jun'ichi Yokoyama,
Prog. Theor. Phys. 124: 541-546 (2010), [arXiv:1005.1171].[2]''Phantom boundary crossing and anomalous growth index of fluctuations in viable f(R) models of cosmic acceleration'',Hayato Motohashi, Alexei A. Starobinsky, Jun'ichi Yokoyama,
Prog. Theor. Phys. 123: 887-902 (2010), [arXiv:1002.1141].[1]''Analytic solution for matter density perturbations in a class of viable cosmological f(R) models'',Hayato Motohashi, Alexei A. Starobinsky, Jun'ichi Yokoyama,
Int. J. Mod. Phys. D 18: 1731-1740 (2009), [arXiv:0905.0730].
Non-refereed publications
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[10]''Black Hole Perturbation in Modified Gravity Theories '',Hayato Motohashi, Tsutomu Kobayashi and Teruaki Suyama,
Proceedings of the 13th Marcel Grossmann Meeting Meeting on General Relativity,
C12-07-01.1, p.1295-1297, (2015).[9]''Reheating after f(R) inflation and observational constraints'',Atsushi Nishizawa and Hayato Motohashi,
Proceedings of the 13th Marcel Grossmann Meeting Meeting on General Relativity,
C12-07-01.1, p. 1167-1169 (2015).[8]''Loop contribution to inflationary magnetic field'',[7]''f(R) Cosmology and Massive Neutrinos'',Hayato Motohashi, Alexei A. Starobinsky and Jun'ichi Yokoyama,
Proceedings of CosPA 2011, Peking University,
Int. J. Mod. Phys. Conf. Ser. 10, 35 (2012).[6]''Joint description of inflation and dark energy in extended f(R) gravity'',Hayato Motohashi, Alexei A. Starobinsky and Jun'ichi Yokoyama,
Proceedings of the 21st Workshop on General Relativity and Gravitation in Japan, pp. 34-37 (2011).[5]''Stability of Schwarzshild-like spacetime in parity violating gravitational theories'',Hayato Motohashi and Teruaki Suyama,
Proceedings of the 21st Workshop on General Relativity and Gravitation in Japan, pp. 22-25 (2011).[4]''f(R) Gravity and its Cosmological Implications'',Hayato Motohashi, Alexei A. Starobinsky and Jun'ichi Yokoyama,
Proceedings of 2nd International Workshop on Dark Matter, Dark Energy and Matter-Antimatter Asymmetry (2011),
Int.J.Mod.Phys. D20 (2011), pp. 1347-1355, [arXiv:1101.0716].[3]''Classification of Future Phantom-to-Normal Oscillations in f(R) Gravity'',Hayato Motohashi, Alexei A. Starobinsky and Jun'ichi Yokoyama,
Proceedings of the 20th Workshop on General Relativity and Gravitation in Japan, pp. 286-289 (2010).[2]''Phantom behaviour and growth index anomalous evolution in viable f(R) gravity models'',Hayato Motohashi, Alexei A. Starobinsky and Jun'ichi Yokoyama,
Proceedings of the 19th Workshop on General Relativity and Gravitation in Japan, pp. 239-242 (2010), [arXiv:1002.0462].[1]''Analytic solution for matter density fluctuations in f(R) models of cosmic acceleration'',Hayato Motohashi, Alexei A. Starobinsky and Jun'ichi Yokoyama,
Proceedings of the 9th Asia-Pacific International Conference on Gravitation and Astrophysics, pp. 246-255 (2010).
Thesis
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Doctor thesis (December, 2013)
''Cosmological consequences of modified gravity for the primordial and late-time cosmic acceleration''
Master thesis (December, 2010)
''An Approach for Dark Energy Problem by Modified Gravity Theory''
「修正重力理論によるダークエネルギー問題へのアプローチ」