output
20172025
most citedEmergence of the Cotton tensor for describing gravity

40 citations

11 papers

cond-mat.str-el2025★ 9 cited

Monte Carlo study on critical exponents of the classical Heisenberg model in ferromagnetic icosahedral quasicrystal

Shinji Watanabe, Tsunetomo Yamada, Hiroyuki Takakura +1

Quasicrystals (QCs) lack three-dimensional periodicity of atomic arrangement but possess long-range structural order, which are distinct from periodic crystals and random systems.…

gr-qc2025★ 3 cited

Exact vacuum solution with Hopf structure in general relativity

Junpei Harada

An exact solution to the vacuum Einstein equations is presented, whose structure is based on the Hopf fibration. The solution employs a geodesic null vector field that defines a tw…

physics.med-ph2025★ 6 cited

Evaluation of the uncertainty in calculating nanodosimetric quantities due to the use of different interaction cross sections in Monte Carlo track structure codes

Carmen Villagrasa, Giorgio Baiocco, Zine-El-Abidine Chaoui +11

This study evaluates the uncertainty in nanodosimetric calculations caused by variations in interaction cross sections within Monte Carlo Track Structure (MCTS) simulation codes. N…

gr-qc2024

Gauge-invariant formulation for the gravitational wave equations

Junpei Harada

A gauge-invariant formulation for the gravitational wave equations is presented. Using this approach, weak, plane wave solutions in a vacuum are derived in various theories. These…

gr-qc2023★ 33 cited

Gravity at cosmological distances: Explaining the accelerating expansion without dark energy

Junpei Harada

Three theoretical criteria for gravitational theories beyond general relativity are considered: obtaining the cosmological constant as an integration constant, deriving the energy…

gr-qc2023★ 27 cited

Dark energy in conformal Killing gravity

Junpei Harada

The Friedmann equation, augmented with an additional term that effectively takes on the role of dark energy, is demonstrated to be an exact solution to the recently proposed gravit…