154 citations · 720 across the 15 of their papers we have counts for
15 papers
Evolution of thermodynamic quantities on cosmological horizon in model
Nobuyoshi Komatsu
The horizon of a flat Friedmann--Robertson--Walker (FRW) universe is considered to be dynamic when the Hubble parameter and the Hubble radius vary with time, unlike for…
Horizon thermodynamics and cosmological equations: A holographic-like connection between thermostatistical quantities on a cosmological horizon and in the bulk
Nobuyoshi Komatsu
Horizon thermodynamics is expected to be related to the effective energy based on the energy density calculated from the Friedmann equation for a Friedmann--Robertson--Walker (FRW)…
Energy stored on a cosmological horizon and its thermodynamic fluctuations in holographic equipartition law
Nobuyoshi Komatsu
Our Universe is expected to finally approach a de Sitter universe whose horizon is considered to be in thermal equilibrium. In the present article, both the energy stored on the ho…
Evolution of dissipative and non-dissipative universes in holographic cosmological models with a power-law term
Nobuyoshi Komatsu
Density perturbations related to structure formations are expected to be different in dissipative and non-dissipative universes, even if the background evolution of the two univers…
Entropy production due to adiabatic particle creation in a holographic dissipative cosmology
Nobuyoshi Komatsu
Cosmological adiabatic particle creation results in the generation of irreversible entropy. The evolution of this entropy is examined in a flat Friedmann--Robertson--Walker univers…
Horizon thermodynamics in holographic cosmological models with a power-law term
Nobuyoshi Komatsu
Thermodynamics on the horizon of a flat universe at late times is studied in holographic cosmological models that assume an associated entropy on the horizon. In such models, a $Λ(…
Generalized thermodynamic constraints on holographic-principle-based cosmological scenarios
Nobuyoshi Komatsu
The holographic principle can lead to cosmological scenarios, i.e., holographic equipartition models. In this model, an extra driving term (corresponding to a time-varying cosmolog…
Thermodynamic constraints on a varying cosmological-constant-like term from the holographic equipartition law with a power-law corrected entropy
Nobuyoshi Komatsu
A power-law corrected entropy based on a quantum entanglement is considered to be a viable black-hole entropy. In this study, as an alternative to Bekenstein-Hawking entropy, a pow…
Cosmological model from the holographic equipartition law with a modified Rényi entropy
Nobuyoshi Komatsu
Cosmological equations were recently derived by Padmanabhan from the expansion of cosmic space due to the difference between the degrees of freedom on the surface and in the bulk i…
General form of entropy on the horizon of the universe in entropic cosmology
Nobuyoshi Komatsu, Shigeo Kimura
Entropic cosmology assumes several forms of entropy on the horizon of the universe, where the entropy can be considered to behave as if it were related to the exchange (the transfe…
Cosmic microwave background radiation temperature in a dissipative universe
Nobuyoshi Komatsu, Shigeo Kimura
The relationship between the cosmic microwave background radiation temperature and the redshift, i.e., the -- relation, is examined in a phenomenological dissipative model. T…
Entropic cosmology in a dissipative universe
Nobuyoshi Komatsu, Shigeo Kimura
The bulk viscosity of cosmological fluid and the creation of cold dark matter both result in the generation of irreversible entropy (related to dissipative processes) in a homogene…
Evolution of the universe in entropic cosmologies via different formulations
Nobuyoshi Komatsu, Shigeo Kimura
We study two types of entropic-force models in a homogeneous, isotropic, spatially flat, matter-dominated universe. The first type is a ` type' similar to CDM (varying-…
Entropic cosmology for a generalized black-hole entropy
Nobuyoshi Komatsu, Shigeo Kimura
An entropic-force scenario, i.e., entropic cosmology, assumes that the horizon of the universe has an entropy and a temperature. In the present study, in order to examine entropic…
Non-adiabatic-like accelerated expansion of the late universe in entropic cosmology
Nobuyoshi Komatsu, Shigeo Kimura
In `entropic cosmology', instead of a cosmological constant , an extra driving term is added to the Friedmann equation and the acceleration equation, taking into account the ent…