# 研究成果・発表論文

### Angular Momentum Transport in Early-formed Objects by Cosmic Background Radiation: Radiation-hydrodynamical Approach

#### Tsuribe, Tohru,   Umemura, Masayuki

The effects of radiation force by the cosmic background radiation (CBR) on early-formed objects shortly after the cosmological recombination are explored. In particular, we are interested in the angular momentum transport in massive disks that origin...

### Self-Similar Viscous Collapse of a Self-Gravitating, Polytropic Gas Disk

#### Mineshige, Shin,   Nakayama, Kunji,   Umemura, Masayuki

Self-similar solutions for the time evolution of polytropic, self- gravitating viscous disks is found on the condition that the kinematic viscosity is nu åisebox-0.5ex~ r(\l\ and the gas pressure is P \i̊sebox-0.5ex~ rho (Gamma ) , where l and Gamma ...

### Very Strong Microlensing of Distant Luminous Stars by Relic Massive Black Holes

#### Turner, Edwin L.,   Umemura, Masayuki

We examine the possibility that a population of relic massive black holes, perhaps constituting an important component of the dark matter, might be indirectly detected via their occasional very strong gravitational lensing of individual luminous star...

### Self-similar Collapse of a Self-gravitating Viscous Disk

#### Mineshige, Shin,   Umemura, Masayuki

A self-similar solution for time evolution of isothermal, self- gravitating viscous disks is found under the condition that \ensuremathα' \ensuremath≡ \ensuremathα(H/r) is constant in space (where \ensuremathα is the viscosity parameter and H/r is th...

### Angular Momentum Transport in Early-formed Objects by Cosmic Background Radiation: Radiation-hydrodynamical Approach

#### Tsuribe, Tohru,   Umemura, Masayuki

The effects of radiation force by the cosmic background radiation (CBR) on early-formed objects shortly after the cosmological recombination are explored. In particular, we are interested in the angular momentum transport in massive disks that origin...

### Self-Similar Viscous Collapse of a Self-Gravitating, Polytropic Gas Disk

#### Mineshige, Shin,   Nakayama, Kunji,   Umemura, Masayuki

Self-similar solutions for the time evolution of polytropic, self- gravitating viscous disks is found on the condition that the kinematic viscosity is nu åisebox-0.5ex~ r(\l\ and the gas pressure is P \i̊sebox-0.5ex~ rho (Gamma ) , where l and Gamma ...

### Very Strong Microlensing of Distant Luminous Stars by Relic Massive Black Holes

#### Turner, Edwin L.,   Umemura, Masayuki

We examine the possibility that a population of relic massive black holes, perhaps constituting an important component of the dark matter, might be indirectly detected via their occasional very strong gravitational lensing of individual luminous star...

### Self-similar Collapse of a Self-gravitating Viscous Disk

#### Mineshige, Shin,   Umemura, Masayuki

A self-similar solution for time evolution of isothermal, self- gravitating viscous disks is found under the condition that \ensuremathα' \ensuremath≡ \ensuremathα(H/r) is constant in space (where \ensuremathα is the viscosity parameter and H/r is th...