The Cosmological Constant

Carroll, Sean M.

doi:10.12942/lrr-2001-1

Cited by 2,141 publications

(1,470 citation statements)

References 258 publications

(426 reference statements)

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“…Review papers on the cosmic acceleration problem and the dark energy associated with it can be found, e.g., in [1,2,3,4,5,6,7,8] and references therein. One of the prime candidates is the cosmological constant Λ.…”

Section: Introductionmentioning

confidence: 99%

Contribution of the cosmological constant to the relativistic bending of light revisited

2007

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Section: Introductionmentioning

confidence: 99%

Contribution of the cosmological constant to the relativistic bending of light revisited

2007

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“…For αv 1,0 v 0,1 1 (85) results in the observed value of (10 −3 eV) 4 for L, L in the millimeter scale and for αv 1,0 …”

Section: Inducing a Small Cosmological Constant By Breaking The Symmementioning

confidence: 88%

“…The standard explanation for the accelerated expansion of the universe is a positive definite cosmological constant in Einstein field equations [3,4]. A cosmological constant (CC) may be considered either as a geometrical object (e.g.…”

Section: Introductionmentioning

confidence: 99%

A way to get rid of cosmological constant and zero-point energy problems of quantum fields through metric reversal symmetry

Erdem¹

2008

J. Phys. A: Math. Theor.

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In this paper, a framework is introduced to remove the huge discrepancy between the empirical value of the cosmological constant and the contribution to the cosmological constant predicted from the vacuum energy of quantum fields. An extra-dimensional space with metric reversal symmetry and R 2 gravity (that reduces to the usual R gravity after integration over extra dimensions) is considered to this end. The resulting four-dimensional energy-momentum tensor (obtained after integration over extra dimensions) consists of terms that contain off-diagonally coupled pairs of Kaluza-Klein modes. This, in turn, generically results in the vanishing of the vacuum expectation value of the energy-momentum tensor for quantum fields, and offers a way to solve the problem of huge contribution of quantum fields to the vacuum energy density.

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“…Despite its notable success in explaining current cosmological data sets, this standard paradigm suffers from several serious problems: the measured value of the cosmological constant is far smaller than the prediction of quantum field theory, and there is also a coincidence problem as to why the energy densities of matter and the cosmological constant are of the same order today (see, e.g., Ref. [4] for a review).…”

Section: Introductionmentioning

confidence: 99%

Revisiting the screening mechanism inf(R)gravity

Hawken

et al. 2014

Phys. Rev. D

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The full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. We reexamine the screening mechanism in fðRÞ gravity using N-body simulations. By explicitly examining the relation between the extrascalar field δf R and the gravitational potential ϕ in the perturbed Universe, we find that the relation between these two fields plays an important role in understanding the screening mechanism. We show that the screening mechanism in fðRÞ gravity depends mainly on the depth of the potential well and find a useful condition for identifying unscreened haloes in simulations. We also discuss the potential application of our results to real galaxy surveys.

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The Cosmological Constant

Cited by 2,141 publications

References 258 publications

Contribution of the cosmological constant to the relativistic bending of light revisited

Contribution of the cosmological constant to the relativistic bending of light revisited

A way to get rid of cosmological constant and zero-point energy problems of quantum fields through metric reversal symmetry

Revisiting the screening mechanism inf(R)gravity

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