Results 91 to 100 of about 708 (181)

Quantum Cosmology of Quadratic f(R) Theories with a FRW Metric

Advances in Mathematical Physics, 2017
We study the quantum cosmology of a quadratic fR theory with a FRW metric, via one of its equivalent Horndeski type actions, where the dynamic of the scalar field is induced.
V. Vázquez-Báez, C. Ramírez
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The Principle of Phase Transition Cosmology: The Current Universe Formed by the Evolution of Two-Component Quantum Superfluid

Reports in Advances of Physical Sciences
This paper aims to demonstrate that modern cosmology has overlooked the systematic and holistic aspects of the universe’s evolution. It is based on the notion that the primordial universe comprised a two-component quantum superfluid and a synthesis of ...
Xiaodong Yang, Yuchen Yang, Zhen Luo, Yuanbo Bi   +3 more
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Inflation and Cosmological Perturbations [PDF]

, 2010
The purpose of these lectures is to give a pedagogical introduction to inflation and the production of the primordial perturbations, as well as a review of some of the latest developments in this domain.
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An open system approach to gravity

Journal of High Energy Physics
Several major open problems in cosmology — including the nature of inflation, dark matter, and dark energy — share a common structure: they involve spacetime-filling media with unknown microphysics, and can be probed so far only through their ...
Santiago Agüí Salcedo, Thomas Colas, Lennard Dufner, Enrico Pajer   +3 more
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Inflation and axion cosmology

Physics Letters B, 1988
Abstract It is argued that the standard constraint ƒ⪷10 12 GeV in the axion theory and related constraints in the theories of other weakly interacting scalar fields do not apply in many versions of the inflationary universe scenario.
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Inflation and isotropization in quintom cosmology

Journal of Cosmology and Astroparticle Physics
Abstract This paper studies inflation and isotropization in the quintom model in the Bianchi-I, Bianchi-III, and Kantowski-Sachs backgrounds. First, we investigate inherent properties and generalize Heusler's proposition. Then by the use of the dynamical system approach, we consider the system in multiplicative and collective modes of ...
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The Spectre of Underdetermination in Modern Cosmology

Philosophy of Physics
The scientific status of physical cosmology has been the subject of philosophical debate ever since detailed mathematical models of the universe emerged from Einstein’s general theory of relativity.
Pedro G. Ferreira, William J. Wolf, James Read   +2 more
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Inflation at the End of 2025: Constraints on $r$ and $n_s$ Using the Latest CMB and BAO Data

The Open Journal of Astrophysics
Inflation elegantly provides initial conditions for the standard model of cosmology, while solving the horizon, flatness, and magnetic monopole problems. Inflationary models make predictions for the tensor-to-scalar ratio $r$ and the spectral index $n_s$
Lennart Balkenhol, E. Camphuis, F. Finelli, K. Benabed, F. R. Bouchet, J. Carron, S. Galli, E. Hivon, A. R. Khalife, L. Knox, C. L. Reichardt, A. Vitrier, W. L. K. Wu   +12 more
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Geometrothermodynamic Cosmology. [PDF]

Entropy (Basel), 2023
Luongo O, Quevedo H.
europepmc   +1 more source

On inflation and torsion in cosmology

, 2005
In a recent letter by H. Davoudiasl, R. Kitano, T. Li and H. Murayama ``The new Minimal Standard Model'' (NMSM) was constructed that incorporates new physics beyond the Minimal Standard Model (MSM) of particle physics. The authors follow the principle of minimal particle content and therefore adopt the viewpoint of particle physicists. It is shown that
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