Liberality Research

Liberality Research は、分野の壁に捉われず、多様な科学的視点から研究を重ね、新しい情報を発信していくところです。


Liberality Research 研究会




 2024年6月9日 13時~16時

 講師:高木 翼氏 JAIST


 会場:Science & Art Room 


    zoom 参加も可能ですが、





 2024年5月4日 13時~16時






 2024年3月16日 13時~19時



















Asymptotically free and safe quantum gravity scenarios consistent with Hubble, laboratory, and inflation scale physics


          Hiroki Hoshina

Phys. Rev. D 106, 086024 – Published 31 October 2022




To find out the possible scenarios for quantum gravity consistent with the observed Universe, we numerically investigate the nonperturbative renormalization group equations of a general quadratic gravity theory recently derived by Sen et al. [J. High Energy Phys. 03 (2022) 130]. As boundary conditions, we impose consistency with the Hubble and laboratory scale experiments, as well as the Starobinsky model of inflation. We find two kinds of trajectories that go to different regimes at the trans-Planckian scales: (i) a trajectory that flows to the asymptotically free regime and (ii) a trajectory that flows to the asymptotically safe regime. To determine the early-time cosmological scenario, additional observational data from beyond the homogeneous and isotropic space-time are necessary.



Beyond Logical Structure of Quantum Mechanics: 


An Algebra of Projection Operators in


Quantum Field Theory



         Satoru Saito and Tsubasa Takagi


                             March 2021




An algebra is derived, which generates dynamics of the quantum field theory (QFT), based on creation and annihilation operators. We show the existence of a commutative subalgebra which determines microscopic projective processes, and is sufficient to incorporate unitary transformations of all global phenomena.



Dynamic logic of quantum field theory


 Takagi, T., Hoshina, H., Iizawa, M.,Saito,S.


      arXiv preprint arXiv:2002.12203 (2020)