Cosmology: recent developments

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Cosmology recent developments
Luca Amendola INAF-Osservatorio Astronomico di
Roma INFN/Spazio
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Cosmology a few things thatI consider
interesting, promisingand possibly related to
space missions
Luca Amendola INAF-Osservatorio Astronomico di
Roma INFN/Spazio
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CMBin 1999
2001
2003
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SNIain 1998
2000
2004
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New physics and cosmology

• Existence and nature of dark energy
• cosmological constant, equation of state, scalar
  field, modified gravity,
• interacting, phantom,....
• Tests of gravity
• grav. waves, dark matter/baryons, scalar gravity,
  deviation from inverse square law, finite range
• Variation of fundamental constants
• G(t,r,..), m(t,r,..), a(t,r...)
• Signature of string effects
• dilaton coupling, cosmological bounces
• Testing brane-world models
• effects of gravitational propagation,
  compactification

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Dark energy/space

• SN in space
• sky coverage, temporal sampling, infrared
• sensitivity

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Dark energy/space
interaction strenght
equation of state
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What is gravity ?

• Gravity a universal force mediated
• by a tensor field in 3D space

• Universal? or violation of equivalence
  principle?
• Tensor? or there are scalar/vector components?
• 3D space? or propagation in n-dim bulk ?

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inner space/outer space

• Infinite bulk
• ordinary gravity at small scales
• (lt1Mpc)

Compactified bulk ordinary gravity at large
scales (gt1 mm)
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inner space/outer space

• Infinite bulk
• ordinary gravity at small scales
• (lt1Mpc)

Compactified bulk ordinary gravity at large
scales (gt1 mm)
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Gravitys rainbow
Dilaton coupling
Dark energy interaction
Extra dim. leakage
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Gravity/space

• Such a gravity law will change the evolution of
  the universe at all scales and all times if ? is
  large
• Effects at background (i.e. cosmic expansion),
  linear (i.e., perturbations) and non-linear
  (i.e. galaxy formation) level
• If the interaction range depends on the local
  density, experiments in space could prove
  necessary

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N-body simulations
?
a 0.02
a 0.05
A. Macciò et al. PRD 2004
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Dark energy/space
Gravity/space

• New tests of dark energy
• GRB at zgt1
• CMB and polarization
• Sunjayev-Zeldovich effect
• Deep photometric/spectroscopic redshift surveys
  (baryon oscillations)

• New tests of gravity
• Lunar laser ranging
• Cosmological tests
• VEP tests in space

rad
mat
V(r)
DE
mm
Mpc
r