Predictive power of strong coupling in theories with large distance modified gravity

By G. Dvali. 2006

147 citations recorded by the source corpus.

We consider theories that modify gravity at cosmological distances, and show that any such theory must exhibit a strong coupling phenomenon, or else it is either inconsistent or is already ruled out by solar system observations. We show that all the ghost-free theories that modify dynamics of spin-2 graviton on asymptotically flat backgrounds, automatically have this property. Due to the strong coupling effect, modification of the gravitational force is source-dependent, and for lighter sources sets in at shorter distances. This universal feature makes modified gravity theories predictive and potentially testable not only by cosmological observations, but also by precision gravitational measurements at scales much shorter than the current cosmological horizon.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/3b63b464cb6f19671d27646d5b2b419ff575dfb3

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Citations in the corpus

Approaches to understanding cosmic acceleration (2009, background): “(85) Interestingly, significant departures from standard gravity persist down to scales smaller than rc; for a mass source of Schwarzschild radius rg , modifications will be relevant down to scales equal to the Vainshtein radius r∗ ≡ (rgr(2) c )1/3 [178, 179].”
The Swampland: Introduction and Review (2019, unknown): “56 This helicity decomposition reads (see, for example, [411]) wμν = hμν + 2∂(μχν) + Π L μνπ .”
f(R) Theories (2010, background): “There is a claim that the ghost may disappear for the Vainshtein radius r* of the order of H −1 0 , because the linear perturbation theory is no longer applicable [218].”
Beyond the Cosmological Standard Model (2014, unknown): “It is worthwhile to briefly review the proof of this fact found in [769, 770].”
Quantum compositeness of gravity: black holes, AdS and inflation (2013, background): “For example, the above equation is the effective equation satisfied by the two transverse tensorial polarizations of the Pauli-Fierz massive graviton, obtained by integrating out the longitudinal polarizations, and thus, viewed as a full theory it cannot be ghost-free [45].”
Cascading gravity and degravitation (2007, methodology): “Indeed, a key observation made in [5, 19] is that any degravitating theory must reduce at the linearized level to a theory in which the graviton has a mass or is a resonance, i.”
Quantum break-time of de Sitter (2017, background): “Following [13, 14], these degrees of freedom can be split according to irreducible massless representations of the Poincaré group”
Theoretical Aspects of Massive Gravity (2011, background): “69) is known as a resonance mass, or soft mass [178, 179, 180, 181, 182, 183, 184, 134, 52, 55].”
Modified Gravity and Cosmology (2011, background): “It has actually been argued that strong coupling on the vacuum can be a virtue in modified gravity models [447].”
Bi-galileon theory I: motivation and formulation (2010, background): “It is precisely this strong coupling that allows the Vainshtein mechanism to take effect as non-linearities become important at larger than expected distances, helping to shut down the scalar on Solar System scales [18, 44].”
Nonlocal gravity. Conceptual aspects and cosmological predictions (2017, methodology): “This was first observed by Dvali [47] in the context of massive electrodynamics.”
Photon and graviton mass limits (2008, background): “Dvali (171) recently has explained from a very general perspective how nonlinear coupling can make the zero-mass limit continuous at finite radius.”
Degravitation of the cosmological constant and graviton width (2007, methodology): “Such theories then should fall within the general category of large distance modified gravity theories that can be testable by precision gravitational measurements [5].”