Violations of the equivalence principle in a dilaton-runaway scenario

By T. Damour, F. Piazza, G. Veneziano. 2002

278 citations recorded by the source corpus.

We explore a version of the cosmological dilaton-fixing and decoupling mech- anism in which the dilaton-dependence of the low-energy effective action is extremized for infinitely large values of the bare string coupling g 2 s = e � . We study the efficiency with which the dilatonruns away towards its "fixed point" at infinity during a primordial inflationary stage, and thereby approx- imately decouples from matter. The residual dilaton couplings are found to be related to the amplitude of the density fluctuations generated during infla- tion. For the simplest inflationary potential, V (�) = 1 m 2(�)� 2 , the residual dilaton couplings are shown to predict violations of the universality of gravita- tional acceleration near thea/a ∼ 10 −12 level. This suggests that a modest improvement in the precision of equivalence principle tests might be able to detect the effect of such a runaway dilaton. Under some assumptions about the coupling of the dilaton to dark matter and/or dark energy, the expected time-variation of natural "constants" (in particular of the fine-structure con- stant) might also be large enough to be within reach of improved experimental or observational data.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/8934dea08d0ec64fc28ede2c7772ae021b048aaf

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Citations in the corpus

Varying Constants, Gravitation and Cosmology (2010, methodology): “This was generalized to quintessence models with a couplings of the form Z(φ)FFμν [11, 112, 162, 315, 314, 347, 404, 531] and then to models of runaway dilaton [133, 132] inspired by string theory (see Section 5.”
Gauss–Bonnet cosmologies: crossing the phantom divide and the transition from matter dominance to dark energy (2007, background): “We should also note that observations are made of objects that can be classified as visible matter or dust [22, 23]; hence a value of Q(2)d 1 is suggestive to agree with the current observational limits on deviations from the equivalence principle.”
Quantum-Spacetime Phenomenology (2008, background): “[521, 195, 196, 194, 193, 192], and references therein, predict violations of the equivalence principle in the semiclassical-gravity limit.”
Theoretical aspects of the equivalence principle (2012, background): “Under this very general, technically simple (but physically highly non-trivial) assumption, one finds that the inflationary stage of cosmological expansion has the effect of naturally driving φ towards values so large that the present observational deviations from GR are compatible with all the curr”
Solar system effects in Schwarzschild de Sitter space time (2006, background): “avity. We envisage to repeat this kind of calculation in more general contexts like quintessence [5, 4] (for a ﬁrst step in this direction see [21]), in varying G scenarios [22], in dilaton scenarios [23, 24], and in braneworld models [8, 25] (see [26, 27] for the discussion of one related eﬀect.). ”
The Confrontation between General Relativity and Experiment (2005, background): “Scalar fields coupled to gravity or matter are also ubiquitous in particle-physics-inspired models of unification, such as string theory [254, 176, 85, 82, 83].”
Modulated fluctuations from hybrid inflation (2004, background): “[33] for a the effect of a fluctuating light dilaton, Ref.”
D‐branes in Standard Model building, gravity and cosmology (2003, background): “9) This is a saddle point It is interesting to note that a similar tracking behavior has been observed in matter interacting with the dilaton in [229].”
Generalized Curvature-Matter Couplings in Modified Gravity (2014, methodology): “omenological model, in which a scalar ﬁeld is non-minimally coupled to pressureless matter with rest mass density ˆ. For the action of the system, we consider: S= Z R 2 F(˚)ˆ+ gr ˚r ˚ p gd4x (117) where F(˚) is an arbitrary function of the scalar ﬁeld that couples non-minimally to ordinary matter.”
Equivalence Principle Violations and Couplings of a Light Dilaton (2010, background): “In another version of this dilaton-cosmological-attractor mechanism, the attractor point φ∗ is located at infinity in field space (“runaway dilaton” model [13]).”