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the Cosmological Constant Problem. Roland TRIAY Centre de Physique Théorique CNRS Université de Provence. Int. Journ. Mod. Phys. D 14,10,1667 (2005). Nonlinear Cosmological Workshop - NCP (2006) Nice. the Cosmological Constant. “Einstein’s biggest blunder”. Observations Geometrical Status

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the cosmological constant problem

the Cosmological Constant Problem

Roland TRIAY

Centre de Physique Théorique CNRS

Université de Provence

Int. Journ. Mod. Phys. D 14,10,1667 (2005)

Nonlinear Cosmological Workshop - NCP (2006) Nice

the cosmological constant
the Cosmological Constant

“Einstein’s biggest blunder”

  • Observations
  • Geometrical Status
  • Modeling Gravitational Structures

Prelude

observations the 80th
Observations - the 80th
  • In the past :
  • Dynamics of galaxies in clusters
  • Minimum age of the Universe

In the 80’s:Hubble diagram (QSOs, BCGs), VLSS (QSOs)

(spatially) closed Universe

observations nowadays
Observations - Nowadays

Nowadays :

CMB temperature fluctuations

Hubble diagram (SuperNovæ)

observations sna
Observations-SNa

A.G. Riess etalastro-ph/0402512

observations nowadays1
Observations - Nowadays

A.V Filippenko astro-ph/0410609

face to the l problem
Face to the L-Problem

« The  Cosmological Constant From the Viewpoint of String Th. » E. Witten 2000

« The  Cosmological Constant Problems » S. Weinberg 2000

« The  Cosmological Constant » S. Carrol 2000

« The Case for a Positive Cosmological L-term » V. Sahni, A. Starobinsky 2000

« The  Cosmological Constant and Dark Energy » P.J.E. Peebles, B. Ratra 2002

« On the Casimir Energy Contribution to the Obs. Value of … » I.O Cherednikov 2002

« The  Cosmological Constant Problem » J. W. Moffat 2003

« Cosmological Constant Weight of the Vacuum » T. Padmanabham 2003

status of l geometry
Status of L- Geometry)

The gravitational field and its sources are characterized by

Schwarzschild solution - Newton approximation

modeling gravitational structures
Modeling gravitational structures

(Modified) Newton law

  • With L : Gravitation becomes repulsive at “large” scale
  • No L-effect in Solar neighborhood
  • Small effect in the outerpart of the Galaxy
  • Intervenes at the edge of LSC
  • Homogeneity scale
the cosmological constant problem1
The cosmological Constant Problem

The contribution of quantum fluctuations

  • A similar problem happens when one assumes
  • Solar neighborhood
  • Primordial epoch ( Vacuum dominate expansion)

Another version of the Cosmological Constant Problem

understanding the acceleration of the cosmological expansion
Understanding the acceleration of the cosmological expansion

Rescaling !!!

Understanding Quantum Gravity !!!