Results 191 to 200 of about 131,283 (219)

Digital quantum simulation of cosmological particle creation with IBM quantum computers. [PDF]

Sci Rep
Maceda MD, Sabín C.
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Higher Equations of Motion for Boundary Liouville Conformal Field Theory from the Ward Identities. [PDF]

Commun Math Phys
Cerclé B.
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Look Beyond Additivity and Extensivity of Entropy for Black Hole and Cosmological Horizons. [PDF]

Entropy (Basel)
Da Browski MP.
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THE COSMOLOGICAL CONSTANT PROBLEM

International Journal of Modern Physics D, 1992
The cosmological constant is a macroscopic parameter which controls the large-scale structure of the Universe. All observations to date have shown that it is very small. However, our modern microscopic theory of particle physics and gravity suggests that the cosmological constant should be very large.
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Cosmological Constant Problem

2017
A suspicion shared by some, including the author, is that a satisfactory solution of the cosmological constant problem would shed much light on the puzzle of quantum gravity. Quantum field theory, vacuum fluctuations, the microscopic degrees of freedom of gravity and their coarse graining all converge to this Pandora’s box in ways that still fascinate ...
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Possible solution to the cosmological-constant problem

Physical Review Letters, 1990
Summary: Classically the unimodular theory of gravity with a constrained determinant \(g_ {\mu\nu}\) is equivalent to general relativity augmented by an arbitrary cosmological constant \(\Lambda\) which arises as an integration constant. At the quantum level we argue that an integration over \(\Lambda\) should be included in the Euclidean path integral
Ng, Y. Jack, van Dam, H.
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The Cosmological Constant Problems

2001
The old cosmological constant problem is to understand why the vacuum energy is so small; the new problem is to understand why it is comparable to the present mass density. Several approaches to these problems are reviewed. Quintessence does not help with either; anthropic considerations offer a possibility of solving both.
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Anthropic Approach to the Cosmological Constant Problems

International Journal of Theoretical Physics, 2003
The notion ``anthropic principle'' is used for decades already for a large number of theories which have as their common property: They make use of the fact that an observation can be done only if an observer exists. In cosmology, this means, that one ``explains'' the initial conditions near the ``big bang'' by the additional condition that at present,
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The Cosmological Constant Problem in Brane-world Cosmology

EAS Publications Series, 2008
It is shown that the cosmological constant problem in brane-world is different from the same problem in general relativity, essentially because the gauge fields fields contributing to the vacuum energy are confined to the brane-world, but the cosmological term propagates in the bulk.
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The Hierarchy Problem and the Cosmological Constant Problem Revisited

2018
Foundations of physics 49(9), 915 - 971 (2019).
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