Approaches to understanding cosmic acceleration

By A. Silvestri, M. Trodden. 2009

333 citations recorded by the source corpus.

Theoretical approaches to explaining the observed acceleration of the universe are reviewed. We briefly discuss the evidence for cosmic acceleration, and the implications for standard general relativity coupled to conventional sources of energy–momentum. We then address three broad methods of addressing an accelerating universe: the introduction of a cosmological constant, its problems and origins; the possibility of dark energy and the associated challenges for fundamental physics and the option that an infrared modification of general relativity may be responsible for the large-scale behavior of the universe.

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/2abc6f9553a98a508a84fc0b3d1dfa53cf8a3b04

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In Astronomy and Astrophysics

Citations in the corpus

Beyond the Cosmological Standard Model (2014, neutral): “There are various constraints on its form coming both from theoretical consistency and phenomenological viability [245]: • In regions of high curvature, where |RfRR| 1 and fR ∼ 0, the equation for the mass of the scalar (5.”
Cosmological tests of modified gravity (2015, background): “There are a number of cosmological observations that measure different geometrical quantities (see [11, 14, 15] for reviews).”
Formation of Galaxy Clusters (2012, background): “Recently, there has been a renewed interest in modificationsto the standard GR theory of gravity (e.g., see Capozziello & de Laurentis 2011, Durrer &Maartens 2008, Silvestri & Trodden 2009, for recent reviews).”
Holographic dark energy (2016, background): “Although favored by the observations, the ΛCDM model suffers from two cosmological constant problems [12, 13, 14, 15, 16, 17, 18, 19, 20].”
The 6dF Galaxy Survey: z \approx 0 measurement of the growth rate and sigma_8 (2012, background): “…like to stress that the γ-parameterisation of modified gravity has its limitations and other more general parameterisations have been proposed (see e.g. Silvestri & Trodden 2009; Bean & Tangmatitham 2010; Daniel & Linder 2010; Clifton et al. 2011; Hojjati, Pogosian & Zhao 2011; Baker et al. 2011).”
THE ATACAMA COSMOLOGY TELESCOPE: COSMOLOGY FROM GALAXY CLUSTERS DETECTED VIA THE SUNYAEV–ZEL'DOVICH EFFECT (2010, background): “A deviation from this predicted growth rate, particularly on linear scales, would signal a breakdown of ΛCDM (see, e.g., Linder 2005; Bertschinger & Zukin 2008; Silvestri & Trodden 2009; Jain & Khoury 2010; Shapiro et al. 2010, and references therein).”
Black-hole binaries, gravitational waves, and numerical relativity (2010, background): “These measurements have, so far, provided no need for a refinement of Einstein’s theory of gravity [though some models to explain cosmic acceleration do involve alternative gravity (Silvestri and Trodden, 2009)].”
Effective field theory of dark energy: A review (2019, background): “Usually one refers to these proposals as modified gravity (MG) theories [5, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30].”