Results 11 to 20 of about 74,976 (149)
Homogeneous cosmologies with a cosmological constant [PDF]
Physical Review D, 1999 Spatially homogeneous cosmological models with a positive cosmological constant are investigated, using dynamical systems methods. We focus on the future evolution of these models. In particular, we address the question whether there are models within this class that are de Sitter-like in the future, but are tilted.
Martin Goliath, George F. R. Ellis
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Scientific Reports, 2012 Prediction and control of the dynamics of complex networks is a central problem in network science. Structural and dynamical similarities of different real networks suggest that some universal laws might accurately describe the dynamics of these networks, albeit the nature and common origin of such laws remain elusive.
Krioukov, Dmitri +5 more
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Physical Review D, 2020 We build upon previous investigation of the one-dimensional conformal symmetry of the Friedman-Lema\^ itre-Robertson-Walker (FLRW) cosmology of a free scalar field and make it explicit through a reformulation of the theory at the classical level in terms of a manifestly $\textrm{SL}(2,\mathbb{R})$-invariant action principle. The new tool is a canonical
Ben Achour, Jibril, Livine, Etera R.
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Journal of High Energy Physics, 2019 Abstract We show that the potential of Nambu-Goldstone bosons can have two or more local minima e.g. at antipodal positions in the vacuum manifold. This happens in many models of composite Higgs and of composite Dark Matter. Trigonometric potentials lead to unusual features, such as symmetry non-restoration at high temperature.
Di Luzio L. +3 more
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Backreaction in Cosmology [PDF]
Frontiers in Astronomy and Space Sciences, 2021 In this review, we investigate the question of backreaction in different approaches to cosmological perturbation theory, and with a special focus on quantum theoretical aspects. By backreaction we refer here to the effects of matter field or cosmological inhomogeneities on the homogeneous dynamical background degrees of freedom of cosmology.
S. Schander, S. Schander, T. Thiemann
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Cosmological constant in spinfoam cosmology [PDF]
Physical Review D, 2011 4 pages, 2 ...
Carlo Rovelli +3 more
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COSMOLOGY IN ISLAM, CONSTRUCTING ISLAMIZATION OF NATURE SCIENCE
Jurnal Al-Dustur, 2022 Cosmology is one of the philosophical and scientific objects that become attention in Greek philosophers, especially Aristotle. However, with the times, this cosmology was found in The Qur’an, exactly in the concept of the sky and earth creation which ...
Muhammad Fiqih Cholidi, Safiya Fadlulah
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Journal of Cosmology and Astroparticle Physics, 2016 33 pages, 4 ...
Kehagias, A., Riotto, A.
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Observational constraints on the fractal cosmology
European Physical Journal C: Particles and Fields, 2022 In this paper, we explore a fractal model of the universe proposed by Calcagni (J High Energy Phys 03:120, 2010) for a power-counting renormalizable field theory living in a fractal spacetime.
Mahnaz Asghari, Ahmad Sheykhi
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Comptes Rendus. Physique, 2017 In the approach of Causal Dynamical Triangulations (CDT), quantum gravity is obtained as a scaling limit of a non-perturbative path integral over space-times whose causal structure plays a crucial role in the construction. After some general considerations about the relation between quantum gravity and cosmology, we examine which aspects of CDT are ...
Glaser, L., Loll, R., Loll, R.
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