Varying Constants and Fundamental Cosmology – VARCOSMOFUN’16

Session

[DE] Dark energy

3-DE

13 Sept 2016, 14:00

Room 5

Conveners

[DE] Dark energy

• Shinji Tsujikawa (Tokyo University of Science)

[DE] Dark energy

• Shinji Tsujikawa (Tokyo University of Science)

60. Phenomenology of MTMG

Prof. Antonio De Felice (Yukawa Institute for Theoretical Physics)

13/09/2016, 14:00

parallel

I will briefly introduce MTMG, and discuss its phenomenology for both the self-accelerating and normal branch.

28. Effective gravitational couplings for cosmological perturbations in generalized Proca theories

Ryotaro Kase (Tokyo University of Science)

13/09/2016, 14:35

parallel

We consider the finite interactions of the generalized Proca theory
including the sixth-order Lagrangian and derive the full linear perturbation
equations of motion on the flat Friedmann-Lema\^{i}tre-Robertson-Walker background
in the presence of a matter perfect fluid.
By construction, the propagating degrees of freedom (besides the matter perfect fluid)
are two transverse vector...

67. Thawing model seems to be preferable for dark energy potential in the quintessence scenario

Prof. Hara Tetsuya (Kyoto Sangyo University)

13/09/2016, 15:10

parallel

The time variation of the equation of state $w$ for quintessence scenario with a scalar field as dark energy is studied up to the third derivative ($d^3w/da^3$) with respect to the scale factor $a$, in order to predict the future observations and specify the scalar potential parameters. The third derivative of $w$ for general potential $V$ is derived and applied to several types of...

86. 3-form cosmology: phantom behavior, singularities and interactions

João Morais (Universidad del País Vasco / Euskal Herriko Unibertsitatea)

13/09/2016, 16:10

parallel

The latest cosmological observations by the Planck collaboration (and combined with others) are compatible with a phantom like behavior $(w<-1)$ for the dark energy equation of state that drives the current acceleration of the Universe. With this mindset we look into models where dark energy is described by a 3-form field minimally coupled to gravity. These models have the advantage, when...

6. NonLinear Gravitational Waves as Dark Energy in Warped Spacetimes

Dr Reinoud Slagter (Asfyon and Univ of Amsterdam, The Netherlands)

13/09/2016, 16:35

parallel

On a warped five-dimensional Friedmann-Lema\^{\i}tre-Robertson-Walker(FLRW) spacetime, dark energy can be induced by a U(1) scalar-gauge field on the brane. We consider a zero effective cosmological constant, i.e., the Randall-Sundrum(RS) fine-tuning and no bulk matter fields. The standard model fields interact via the bulk Weyl tensor and cause brane fluctuations. Due to the warp factor,...

57. Vacuum dark energy and spacetime symmetry

Irina Dymnikova (University of Warmia and Mazury)

13/09/2016, 17:00

parallel

1. Vacuum dark fluid presented by variable cosmological term

[I. Dymnikova, Phys. Lett. B 472 (2000) 33; I. Dymnikova, Class. Quant. Grav. 19 (2002) 725 (Honorable Mention-2001 of the Gravity Research Foundation); I. Dymnikova and E. Galaktionov, Phys. Lett. B 645 (2007) 358; I. Dymnikova, Int. J. Mod. Phys. A 31 (2016) 1641005]

1. Regular Cosmologies with Vacuum Dark Energy
   ...

65. Lemaitre class dark energy model for relaxing cosmological constant

Anna Dobosz (University of Warmia and Mazury)

13/09/2016, 17:25

parallel

1. One-horizon spacetimes.
2. Holographic principle.
3. Spacetime singled out by evaporation of the cosmological horizon.
4. Lemaitre class model for relaxing cosmological constant.
5. Cosmological evolution.
6. Anisotropy.