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The accelerated expansion of the universe and the cosmological constant problem ,[object Object],[object Object],Hrvoje Štefančić, Theoretical Physics Division,  Ruđer Bošković Institute, Zagreb, Croatia
Big issues - observational and theoretical ,[object Object],[object Object]
Our concept of the (present) universe ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
The observed universe ,[object Object],[object Object],[object Object],[object Object]
Expansion of the universe ,[object Object],[object Object],[object Object],[object Object],[object Object]
FRW model – theoretical description of the expansion ,[object Object],[object Object],[object Object],[object Object],[object Object]
FRW model ,[object Object],[object Object],[object Object]
Cosmological observations – mapping the expansion ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Supernovae of the type Ia ,[object Object],[object Object],[object Object],[object Object],[object Object]
Cosmological observations - SNIa ,[object Object],[object Object]
Cosmological observations - CMB ,[object Object]
Cosmological observations - LSS ,[object Object],[object Object]
Standard cosmological model (up to 1998) ,[object Object],[object Object],[object Object]
Spatial curvature ,[object Object],[object Object]
SNIa observations (1998) ,[object Object],[object Object],[object Object],[object Object],[object Object]
CMB and BAO ,[object Object],[object Object],[object Object]
Combining observational data ,[object Object],[object Object],[object Object]
Observational constraints to the DE EOS  ,[object Object],[object Object]
Accelerated expansion ,[object Object],[object Object]
Classification of theoretical approaches  ,[object Object],R. Bean, S. Caroll, M. Trodden,  Insights into dark energy: interplay between theory and observation.  Rachel Bean  ( Cornell U., Astron. Dept. ) ,  Sean M. Carroll  ( Chicago U., EFI  &  KICP, Chicago ) ,  Mark Trodden  ( Syracuse U. ) . Oct 2005. 5pp.  White paper submitted to Dark Energy Task Force.  http://arxiv.org/abs/astro-ph/0510059
Distorted signals and unjustified assumptions? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Distorted signals and unjustified assumptions? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Distorted signals and unjustified assumptions? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Mechanism of the acceleration ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Dark energy ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Dark energy ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Dark sector ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
DE models ,[object Object],[object Object],[object Object],[object Object]
Λ CDM ,[object Object],[object Object],[object Object],[object Object],[object Object]
Quintessence ,[object Object],[object Object],[object Object],[object Object]
Phantom energy ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Singularities ,[object Object],[object Object],[object Object]
Modified gravity ,[object Object],[object Object],[object Object],[object Object],[object Object]
Braneworlds ,[object Object],[object Object],[object Object],[object Object],[object Object]
The cosmological constant ,[object Object],[object Object],[object Object],[object Object],[object Object]
The expansion with the cosmological constant J. Sol à, hep-ph/0101134v2
The expansion with the cosmological constant
Contributions to vacuum energy ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Zero point energies ,[object Object],[object Object],[object Object]
Condensates ,[object Object],[object Object],[object Object],[object Object]
The size of the CC ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
The “old” cosmological constant problem – the problem of size ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
The “old” cosmological constant problem  ,[object Object],[object Object],[object Object],[object Object],[object Object]
DE vs CC ,[object Object],[object Object],[object Object]
Proposed solutions of the “old” CC problem ,[object Object],[object Object],[object Object],[object Object],[object Object]
Symmetry ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Back-reaction mechanisms ,[object Object],[object Object],[object Object],[object Object]
Violation of the equivalence principle ,[object Object],[object Object],[object Object],[object Object]
Statistical approaches ,[object Object],[object Object],[object Object]
The cosmic coincidence problem – the problem of timing ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Possible solutions of the cosmic coincidence problem ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Composite dark energy –  Λ XCDM models ,[object Object],[object Object],[object Object],[object Object],[object Object]
Ratio of DE and matter energy density
Parameter constraints ,[object Object],[object Object],[object Object]
Parameter constraints – cross sections
The CC relaxation mechansim ,[object Object],[object Object],[object Object]
The model dynamics ,[object Object],[object Object],[object Object],[object Object],[object Object]
α < −1: the relaxation mechanism for the large cosmological constant ,[object Object],[object Object]
case ,[object Object],[object Object]
Dependence on model parameters
Dependence on model parameters
Dependence on model parameters
Dependence on model parameters
case ,[object Object],[object Object],[object Object]
Dependence on model parameters
Dependence on model parameters
Dependence on model parameters
Dependence on model parameters
Other parameter regimes ,[object Object],[object Object]
Fixed points, approach to de Sitter regime ,[object Object],[object Object],[object Object]
General inhomogeneous EOS ,[object Object],[object Object],[object Object]
Variable cosmological term ,[object Object],[object Object],[object Object],[object Object]
Variable cosmological term ,[object Object]
f(R) modified gravity ,[object Object],[object Object],[object Object],[object Object]
Important questions  ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Summary of the relaxation mechanism properties ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Relaxing a large cosmological constant - adding matter and radiation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
The formalism ,[object Object],[object Object],[object Object]
½ Model  ,[object Object],[object Object],[object Object],[object Object],[object Object]
The model ,[object Object],[object Object],[object Object]
The deceleration parameter
Normalized energy densities
Absolute energy densities
Effective DE EOS
Conclusions ,[object Object],[object Object],[object Object],[object Object]

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