Results 81 to 90 of about 458,070 (185)
Entropy for horizons in theories of gravitation
Вестник Томского государственного педагогического университета, 2004 A geometrical covariant definition of the variation of conserved quantities is introduced for Lagrangian field theories, suitable for both metric and affine gravitational theories. When this formalism is applied to the HUbert Lagrangian we obtain a covariant definition of the Hamiltonian (and consequently a definition of the Energy) for a gravitational
ALLEMANDI, GIANLUCA +3 more
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The Entropy of the Gravitational Field
, 1992 We derive a formula for the nonequilibrium entropy of a classical stochastic field in terms of correlation functions of this field. The formalism is then applied to define the entropy of gravitational perturbations (both gravitational waves and density fluctuations). We calculate this entropy in a specific cosmological model (the inflationary Universe)
Brandenberger, R. +2 more
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Inflation with low gravitational entropy at the singularity
, 2002 We explore the possibility of a three-stage scenario of the evolution of the Universe which contains power law inflation and explicitly satisfies the so-called low-gravitational-entropy (GE) conditions at the cosmological singularity.
A. V. Nesteruk
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Gravitational Chern-Simons terms and black hole entropy. Global aspects. [PDF]
, 2012 We discuss the topological and global gauge properties of the formula for a black hole entropy due to a purely gravitational Chern-Simons term. We study under what topological and geometrical conditions this formula is well-defined. To this end we have
L. Bonora +9 more
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An Investigation of the Entropy Associated with a Collapsing Molecular Cloud
AstronomyThe investigation of entropy variation during the star formation process within collapsing molecular clouds represents a significant field of inquiry in astrophysics.
Gemechu Muleta Kumssa
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De Sitter Entropy and the Gravitational Path Integral
, 2022 Gibbons and Hawking famously derived the de Sitter horizon entropy from the Euclidean gravitational path integral in the saddle point approximation. In this talk we extend this result in two different ways.
Visser, Manus
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Crossed products and quantum reference frames: on the observer-dependence of gravitational entropy
Journal of High Energy PhysicsA significant step towards a rigorous understanding of perturbative gravitational entropy was recently achieved by a series of works showing that a proper accounting of gauge invariance and observer degrees of freedom converts the Type III algebra of QFT
Julian De Vuyst +3 more
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The entropy of finite gravitating regions
, 2023 44 pages, 6 ...
Balasubramanian, Vijay +1 more
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Anomalous gravitation and its positivity from entanglement
Journal of High Energy Physics, 2019 We explore the emergence of gravitation from entanglement in holographic CFTs with gravitational anomalies. More specifically, the holographic correspondence between topologically massive gravity (TMG) with gravitational Chern-Simons term in the 3D bulk ...
Hongliang Jiang
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Free and classical entropy over the circle. [PDF]
, 2007 Relative entropy with respect to normalized arclength measure on the circle is greater than or equal to the negative logarithmic energy (Voiculescu's negative free entropy) and is greater than or equal to the modified relative free entropy.
Blower, Gordon
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