scholarly journals Thermal history of the early Universe and primordial gravitational waves from induced scalar perturbations

2020 ◽  
Vol 101 (4) ◽  
Author(s):  
Fazlollah Hajkarim ◽  
Jürgen Schaffner-Bielich
Keyword(s):  
Gravitational Waves ◽  
Early Universe ◽  
Thermal History ◽  
Primordial Gravitational Waves ◽  
History Of ◽  
Scalar Perturbations

scholarly journals Signatures of the neutrino thermal history in the spectrum of primordial gravitational waves

2010 ◽  
Vol 43 (4) ◽  
pp. 945-958 ◽  
Author(s):  
Riccardo Benini ◽  
Massimiliano Lattanzi ◽  
Giovanni Montani
Keyword(s):  
Gravitational Waves ◽  
Thermal History ◽  
Primordial Gravitational Waves

TheSU(11) family unified model and the thermal history of the very early universe

1991 ◽  
Vol 104 (12) ◽  
pp. 1687-1695
Author(s):  
Lu Jizong ◽  
Li Xinzhou ◽  
Zhang Guangyen
Keyword(s):  
Early Universe ◽  
Thermal History ◽  
Unified Model ◽  
History Of

scholarly journals Confronting inflation models with the coming observations on primordial gravitational waves

2020 ◽  
Vol 80 (12) ◽  
Author(s):  
Taotao Qiu ◽  
Taishi Katsuragawa ◽  
Shulei Ni
Keyword(s):  
Gravitational Waves ◽  
Early Universe ◽  
Model Building ◽  
Effective Field ◽  
Model Parameters ◽  
Parameter Spaces ◽  
Upper Limit ◽  
Primordial Gravitational Waves ◽  
General Action ◽  
Theoretical Side

AbstractThe recent observations from CMB have imposed a very stringent upper-limit on the tensor/scalar ratio r of inflation models, $$r < 0.064$$ r < 0.064 , which indicates that the primordial gravitational waves (PGW), even though possible to be detected, should have a power spectrum of a tiny amplitude. However, current experiments on PGW is ambitious to detect such a signal by improving the accuracy to an even higher level. Whatever their results are, it will give us much information about the early Universe, not only from the astrophysical side but also from the theoretical side, such as model building for the early Universe. In this paper, we are interested in analyzing what kind of inflation models can be favored by future observations, starting with a kind of general action offered by the effective field theory (EFT) approach. We show a general form of r that can be reduced to various models, and more importantly, we show how the accuracy of future observations can put constraints on model parameters by plotting the contours in their parameter spaces.

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 The Thermal History of the Universe and the Spectrum of Relic Radiation

1974 ◽  
Vol 63 ◽  
pp. 167-173
Author(s):  
R. A. Sunyaev
Keyword(s):  
Energy Release ◽  
Early Universe ◽  
Thermal History ◽  
Energy Production ◽  
Cosmological Models ◽  
Clear Picture ◽  
Evolution Of The Universe ◽  
Strong Turbulence ◽  
History Of ◽  
The Universe

Many of the cosmological models currently under discussion and theories of the origin of galaxies which involve antimatter, strong turbulence and so on result in significant energy release during the evolution of the Universe. It is evident that significant energy production should lead to distortions of the spectrum of the relic radiation. The absence of noticeable deviations from the Planckian spectrum enables us to set limits to the energy release in the early Universe (102 < z< 108). But in order to have a clear picture of possible distortions, let us first review the idealized situation.

Thermal history of the Slušovice-1 borehole

2015 ◽  
Author(s):  
Petr Jirman ◽  
Marek Goldbach ◽  
Eva Geršlová
Keyword(s):  
Thermal History ◽  
History Of
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