Search Results for author: Eiichiro Komatsu

Found 7 papers, 5 papers with code

Lattice Simulations of Inflation

no code implementations12 Feb 2021 Angelo Caravano, Eiichiro Komatsu, Kaloian D. Lozanov, Jochen Weller

In this paper we use a lattice simulation to reproduce the well-known results of some simple models of single-field inflation, particularly for the scalar field perturbation.

Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Phenomenology

The thermal and gravitational energy densities in the large-scale structure of the Universe

1 code implementation3 Jul 2020 Yi-Kuan Chiang, Ryu Makiya, Eiichiro Komatsu, Brice Ménard

As cosmic structures form, matter density fluctuations collapse gravitationally and baryonic matter is shock-heated and thermalized.

Cosmology and Nongalactic Astrophysics

New constraints on the mass bias of galaxy clusters from the power spectra of the thermal Sunyaev-Zeldovich effect and cosmic shear

1 code implementation18 Jul 2019 Ryu Makiya, Chiaki Hikage, Eiichiro Komatsu

This value of $B$ is lower than that needed to reconcile the tSZ data with the primordial CMB and CMB lensing data, i. e., $B = 1. 64 \pm 0. 19$, but is consistent with the mass bias expected from hydrodynamical simulations, $B = 1. 28 \pm 0. 20$.

Cosmology and Nongalactic Astrophysics

Joint analysis of the thermal Sunyaev-Zeldovich effect and 2MASS galaxies: Probing gas physics in the local Universe and beyond

1 code implementation13 Apr 2018 Ryu Makiya, Shin'ichiro Ando, Eiichiro Komatsu

We present a first joint analysis of the power spectra of the thermal Sunyaev-Zeldovich (tSZ) effect measured by the Planck and the number density fluctuations of galaxies in the 2MASS redshift survey (2MRS) catalog, including their cross-correlation.

Cosmology and Nongalactic Astrophysics

Dark Energy from the Thermal Sunyaev Zeldovich Power Spectrum

1 code implementation3 Dec 2017 Boris Bolliet, Barbara Comis, Eiichiro Komatsu, Juan Francisco Macías-Pérez

Finally, by combining the tSZ power spectrum and the CMB data we find, in the $\Lambda$ Cold Dark Matter (CDM) model, the mass bias of $B=1. 71\pm 0. 17$, i. e., $1-b=0. 58\pm 0. 06$ (68% CL).

Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies

Separate Universe Simulations

no code implementations22 Sep 2014 Christian Wagner, Fabian Schmidt, Chi-Ting Chiang, Eiichiro Komatsu

The large-scale statistics of observables such as the galaxy density are chiefly determined by their dependence on the local coarse-grained matter density.

Cosmology and Nongalactic Astrophysics

The Sunyaev-Zel'dovich angular power spectrum as a probe of cosmological parameters

1 code implementation27 May 2002 Eiichiro Komatsu, Uros Seljak

It receives a dominant contribution from cluster region between 20-40% of the virial radius and is thus insensitive to the poorly known gas physics in the cluster centre, such as cooling or (pre)heating.

astro-ph

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