Varying Constants and Fundamental Cosmology – VARCOSMOFUN’16

Session

[MG] Modifications of gravity

1-MG

16 Sept 2016, 14:00

Room 7

Conveners

[MG] Modifications of gravity

• Jose Beltran Jimenez (Universite d'Aix-Marseille)

[MG] Modifications of gravity

• Jose Beltran Jimenez (Universite d'Aix-Marseille)

77. Cosmology of the de Sitter Horndeski models

Nelson Nunes (University of Lisbon)

16/09/2016, 14:00

parallel

The discovery, in 1998, that the Universe is currently undergoing an
accelerated expansion is one of the greatest milestones in all physics.
Naturally, over the last 17 years, many proposals to explain this
evolution have been brought forward. Most ideas involve scalar field
dark energy or extensions of Einstein's gravity. These proposals are
essentially phenomenological without any...

54. Cosmology in genealized Proca theories and beyond

Shinji Tsujikawa (Tokyo University of Science)

16/09/2016, 14:35

parallel

We consider a massive vector field with derivative interactions that propagates only the 3 desired polarizations (besides two tensor polarizations from gravity) with second-order equations of motion in curved space-time. The cosmological implications of such generalized Proca theories are investigated for both the background and the linear perturbation by taking into account the Lagrangian up...

124. Modified gravity with vector distortion and cosmological applications

Jose Beltran Jimenez (Universite d'Aix-Marseille)

16/09/2016, 15:10

parallel

I will introduce a geometrical framework with a connection that is fully determined by a vector field as a generalization of Weyl geometry. Within these geometries, it is possible to formulate gravitational theories that lead to interesting vector-tensor theories with non-minimal couplings and derivative self-interactions such that the vector only propagates the 3 polarizations corresponding...

87. Effective gravitational "constant" in scalar-(curvature)tensor and scalar-torsion gravities

Laur Järv (University of Tartu)

16/09/2016, 16:10

parallel

Cosmology papers arXiv:1003.1686, 1006.1246, 1112.5308, 1411.1947, 1511.03933;
PPN papers arXiv:1309.0031, 1607.?????.

78. Post-Newtonian parameter in f(R) gravity

Dr Masaaki Morita (Okinawa National College of Technology)

16/09/2016, 16:40

parallel

We derive a formula for the post-Newtonian parameter $\gamma$ in $f(R)$ gravity in a straightforward manner without using a scalar-tensor representation or the transformation to the Einstein frame.

The post-Newtonian parameters, defined in the parametrized post-Newtonian formalism, have been used in placing observational constraints on modified theories of gravity with local gravity tests....

96. The Number of Tidal Dwarf Satellite Galaxies in Dependence of Bulge Index

Martín López Corredoira (Instituto de Astrofísica de Canarias)

16/09/2016, 17:10

parallel

ABSTRACT: We show that a significant correlation (up to 5σ) emerges between the bulge index, defined to be larger for a larger bulge/disk ratio, in spiral galaxies with similar luminosities in the Galaxy Zoo 2 of the Sloan Digital Sky Survey and the number of tidal-dwarf galaxies in the catalog by Kaviraj et al. In the standard cold or warm dark matter cosmological models, the number of...