scholarly journals Numerical Relativity as a Tool for Studying the Early Universe

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
David Garrison
Keyword(s):  
Dark Matter ◽  
Magnetic Fields ◽  
Numerical Simulations ◽  
Gravitational Waves ◽  
Early Universe ◽  
Large Scale ◽  
Numerical Relativity ◽  
Turbulent Plasma ◽  
The University ◽  
Scalar Perturbations

Numerical simulations are becoming a more effective tool for conducting detailed investigations into the evolution of our universe. In this paper, we show how the framework of numerical relativity can be used for studying cosmological models. The author is working to develop a large-scale simulation of the dynamical processes in the early universe. These take into account interactions of dark matter, scalar perturbations, gravitational waves, magnetic fields, and turbulent plasma. The code described in this report is a GRMHD code based on the Cactus framework and is structured to utilize one of several different differencing methods chosen at run-time. It is being developed and tested on the University of Houston’s Maxwell cluster.

scholarly journals Magnetism in the Early Universe

2018 ◽  
Vol 14 (A30) ◽  
pp. 295-298
Author(s):  
Tina Kahniashvili ◽  
Axel Brandenburg ◽  
Arthur Kosowsky ◽  
Sayan Mandal ◽  
Alberto Roper Pol
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Gravitational Waves ◽  
Early Universe ◽  
Large Scale ◽  
Direct Detection ◽  
Correlation Lengths ◽  
Cosmological Scenario ◽  
Expansion Of The Universe ◽  
The Universe

AbstractBlazar observations point toward the possible presence of magnetic fields over intergalactic scales of the order of up to ∼1 Mpc, with strengths of at least ∼10−16 G. Understanding the origin of these large-scale magnetic fields is a challenge for modern astrophysics. Here we discuss the cosmological scenario, focussing on the following questions: (i) How and when was this magnetic field generated? (ii) How does it evolve during the expansion of the universe? (iii) Are the amplitude and statistical properties of this field such that they can explain the strengths and correlation lengths of observed magnetic fields? We also discuss the possibility of observing primordial turbulence through direct detection of stochastic gravitational waves in the mHz range accessible to LISA.

scholarly journals Magnetic fields in the early Universe

2008 ◽  
Vol 4 (S259) ◽  
pp. 529-538 ◽  
Author(s):  
Eduardo Battaner ◽  
Estrella Florido
Keyword(s):  
Phase Transitions ◽  
Magnetic Fields ◽  
Early Universe ◽  
Galaxy Formation ◽  
Faraday Rotation ◽  
Large Scale ◽  
Large Scale Structure ◽  
Anisotropy Spectra ◽  
The Universe ◽  
Negligible Influence

AbstractThere is increasing evidence that intense magnetic fields exist at large redshifts. They could arise after galaxy formation or in very early processes, such as inflation or cosmological phase transitions, or both. Early co-moving magnetic strengths in the range 1-10 nG could be present at recombination. The possibilities to detect them in future CMB experiments are discussed, mainly considering their impact in the anisotropy spectra as a result of Faraday rotation and Alfven waves. Magnetic fields this magnitude could also have a non-negligible influence in determining the filamentary large scale structure of the Universe.

scholarly journals Large-scale magnetic fields, non-Gaussianity, and gravitational waves from inflation

2017 ◽  
Vol 32 (36) ◽  
pp. 1747021
Author(s):  
Kazuharu Bamba
Keyword(s):  
Scalar Field ◽  
Magnetic Fields ◽  
Gravitational Waves ◽  
Electromagnetic Fields ◽  
Conformal Invariance ◽  
Large Scale ◽  
Gauge Fields ◽  
Density Perturbations ◽  
Hubble Horizon

We explore the generation of large-scale magnetic fields in the so-called moduli inflation. The hypercharge electromagnetic fields couple to not only a scalar field but also a pseudoscalar one, so that the conformal invariance of the hypercharge electromagnetic fields can be broken. We explicitly analyze the strength of the magnetic fields on the Hubble horizon scale at the present time, the local non-Gaussianity of the curvature perturbations originating from the massive gauge fields, and the tensor-to-scalar ratio of the density perturbations. As a consequence, we find that the local non-Gaussianity and the tensor-to-scalar ratio are compatible with the recent Planck results.

scholarly journals Large-scale magnetic fields from hydromagnetic turbulence in the very early universe

1996 ◽  
Vol 54 (2) ◽  
pp. 1291-1300 ◽  
Author(s):  
Axel Brandenburg ◽  
Kari Enqvist ◽  
Poul Olesen
Keyword(s):  
Magnetic Fields ◽  
Early Universe ◽  
Large Scale

scholarly journals Method of Gravitational Wave Search Based on Adaptive Time-Frequency Analysis and Machine Learning

Impact ◽  
2020 ◽  
Vol 2020 (5) ◽  
pp. 43-45
Author(s):  
Hirotaka Takahashi
Keyword(s):  
Gravitational Wave ◽  
Gravitational Waves ◽  
Large Scale ◽  
Albert Einstein ◽  
Cosmic Ray ◽  
Time Frequency ◽  
Adaptive Time ◽  
Physics Experiment ◽  
The University ◽  
First Time

In simple terms, gravitational waves are ripples in space-time caused by energetic processes in the Universe, such as the movement of mass. One of the exciting things about them is that they can be used to observe systems that are basically impossible to detect using other means. These ripples were predicted by Albert Einstein almost a century ago, but it wasn't until 2016 that scientists announced, for the first time, the detection of gravitational waves. The Laser Interferometer Gravitational-Wave Observatory (LIGO) is the physics experiment responsible for this detection and it has since continued to make a significant impact in the field. LIGO collaborates closely with the Virgo interferometer; a large interferometer designed to detect gravitational waves, and the Japanese Gravitational Wave Detector in Kamioka Mine (KAGRA), the Large Scale Cryogenic Gravitational Wave Telescope; a project of the gravitational wave studies group led by the Institute for Cosmic Ray Research of The University of Tokyo. But there still remain many unknowns, such as challenges related to the data analysis of gravitational waves. Professor Hirotaka Takahashi is carrying out research on gravitational waves that is attempting to address these challenges by developing algorithms that can dramatically increase the speed and efficiency of gravitational wave searches, which he believes are currently insufficient. Takahashi is a member of the KAGRA collaboration, which, as of March 2020, consists of more than 390 researchers from 90 institutions in 14 countries and regions.

scholarly journals Numerical simulations of gravitational waves from early-universe turbulence

2020 ◽  
Vol 102 (8) ◽  
Author(s):  
Alberto Roper Pol ◽  
Sayan Mandal ◽  
Axel Brandenburg ◽  
Tina Kahniashvili ◽  
Arthur Kosowsky
Keyword(s):  
Numerical Simulations ◽  
Gravitational Waves ◽  
Early Universe

scholarly journals The fate of magnetic fields in colliding galaxies

2010 ◽  
Vol 6 (S274) ◽  
pp. 376-380
Author(s):  
Hanna Kotarba ◽  
Harald Lesch ◽  
Klaus Dolag ◽  
Thorsten Naab
Keyword(s):  
Dark Matter ◽  
High Resolution ◽  
Magnetic Fields ◽  
Structure Formation ◽  
Large Scale ◽  
Cold Dark Matter ◽  
Gravitational Interaction ◽  
Interacting Galaxies ◽  
Galactic Dynamics

AbstractThe evolution and amplification of large-scale magnetic fields in galaxies is investigated by means of high resolution simulations of interacting galaxies. The goal of our project is to consider in detail the role of gravitational interaction of galaxies for the fate of magnetic fields. Since the tidal interaction up to galaxy merging is a basic ingredient of cold-dark matter (CDM) structure formation models we think that our simulations will give important clues for the interplay of galactic dynamics and magnetic fields.

scholarly journals CMB anisotropy science: a review

2012 ◽  
Vol 8 (S288) ◽  
pp. 42-52 ◽  
Author(s):  
Anthony Challinor
Keyword(s):  
Dark Matter ◽  
Cosmological Model ◽  
Cosmic Microwave Background ◽  
Gravitational Waves ◽  
Early Universe ◽  
Critical Role ◽  
Microwave Background ◽  
Fundamental Physics ◽  
Standard Cosmological Model

AbstractThe cosmic microwave background (CMB) provides us with our most direct observational window to the early universe. Observations of the temperature and polarization anisotropies in the CMB have played a critical role in defining the now-standard cosmological model. In this contribution we review some of the basics of CMB science, highlighting the role of observations made with ground-based and balloon-borne Antarctic telescopes. Most of the ingredients of the standard cosmological model are poorly understood in terms of fundamental physics. We discuss how current and future CMB observations can address some of these issues, focusing on two directly relevant for Antarctic programmes: searching for gravitational waves from inflation via B-mode polarization, and mapping dark matter through CMB lensing.

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