Solar system tests<i>do</i>rule out<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>1</mml:mn><mml:mo>/</mml:mo><mml:mi>R</mml:mi></mml:math>gravity

Erickcek, Adrienne L.; Smith, Tristan L.; Kamionkowski, Marc

doi:10.1103/physrevd.74.121501

Cited by 258 publications

(248 citation statements)

References 17 publications

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“…It has been argued recently that F (R)-gravity does not pass the solar system tests [20]. Recently, however, in [21], the conditions that even pure F (R)-gravity (of special form) could satisfy the solar system and cosmological tests are derived.…”

Section: Discussionmentioning

confidence: 99%

Dark energy from modified F(R)-scalar-Gauss–Bonnet gravity

Nojiri

Odintsov

Tretyakov³

2007

Physics Letters B

136

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The modified F (R)-scalar-Gauss-Bonnet gravity is proposed as dark energy model. The reconstruction program for such theory is developed. It is explicitly demonstrated that the known classical universe expansion history (deceleration epoch, transition to acceleration and effective quintessence, phantom or cosmological constant era) may naturally occur in such unified theory for some (reconstructed) classes of scalar potentials. Gauss-Bonnet assisted dark energy is also proposed. The possibility of cosmic acceleration is studied there.PACS numbers: 11.25.-w, 95.36.+x, 98.80.-k

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Section: Discussionmentioning

confidence: 99%

Dark energy from modified F(R)-scalar-Gauss–Bonnet gravity

Nojiri

Odintsov

Tretyakov³

2007

Physics Letters B

136

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“…As a result, the metric around the Sun is predicted to be different than is implied by observations. This problem has been explicitly proven to exist for a wide variety of f (R) models, if the Sun is placed into a background of cosmological density [76,77]. * Electronic address: whu@background.uchicago.edu…”

Section: Introductionmentioning

confidence: 99%

Models off(R)cosmic acceleration that evade solar system tests

2007

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We study a class of metric-variation f (R) models that accelerates the expansion without a cosmological constant and satisfies both cosmological and solar-system tests in the small-field limit of the parameter space. Solar-system tests alone place only weak bounds on these models, since the additional scalar degree of freedom is locked to the high-curvature general-relativistic prediction across more than 25 orders of magnitude in density, out through the solar corona. This agreement requires that the galactic halo be of sufficient extent to maintain the galaxy at high curvature in the presence of the low-curvature cosmological background. If the galactic halo and local environment in f (R) models do not have substantially deeper potentials than expected in ΛCDM, then cosmological field amplitudes |fR| 10 −6 will cause the galactic interior to evolve to low curvature during the acceleration epoch. Viability of large-deviation models therefore rests on the structure and evolution of the galactic halo, requiring cosmological simulations of f (R) models, and not directly on solar-system tests. Even small deviations that conservatively satisfy both galactic and solar-system constraints can still be tested by future, percent-level measurements of the linear power spectrum, while they remain undetectable to cosmological-distance measures. Although we illustrate these effects in a specific class of models, the requirements on f (R) are phrased in a nearly model-independent manner.

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“…When Γ is taken to be the metric-compatible (Christoffel) connection, the action (1) represents the so called metric f (R) models [2,3,4,5,6]. Though a realistic universe expansion history may be reconstructed from these models [7,8], they seem to be ruled out as alternatives to dark energy because of their consequences to the Solar system physics [9,10,11], see however [12]. If the connection Γ is promoted to an independent variable, the action (1) represents the f (R) models in the so called Palatini formalism [13,14,15,16,17,18], which instead appear to pass the Solar system tests [19].…”

Section: Introductionmentioning

confidence: 99%

Viable Palatini-f(R)cosmologies with generalized dark matter

Koivisto

2007

Phys. Rev. D

113

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We study the formation of large-scale structure in universes dominated by dark matter and driven to accelerated expansion by f(R) gravity in the Palatini formalism. If the dark matter is cold, practically all of these models are ruled out because they fail to reproduce the observed matter power spectrum. We point out that if the assumption that dark matter is perfect and pressureless at all scales is relaxed, nontrivial alternatives to a cosmological constant become viable within this class of modified gravity models.

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Solar system testsdorule out1/Rgravity

Cited by 258 publications

References 17 publications

Dark energy from modified F(R)-scalar-Gauss–Bonnet gravity

Dark energy from modified F(R)-scalar-Gauss–Bonnet gravity

Models off(R)cosmic acceleration that evade solar system tests

Viable Palatini-f(R)cosmologies with generalized dark matter

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