Aug 10, 2010 ... Dark Forces in the Visible Sector. ▫ ... Remedies by modifications in the Dark
Sector physics. ▫ ... Only 2 dwarfs are observed in the void ...
Dark Forces in the Visible Sector
Great success of the standard cosmological model (LCDM)
Problems in the standard model
Remedies by modifications in the Dark Sector physics
Galactic Ghost Streams
Predictions
Tuesday, August 10, 2010
Collaborators: Ariel Keselman Jim Peebles
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What is the history of structure formation?
Tuesday, August 10, 2010
High Precision Cosmology
Tuesday, August 10, 2010
Gravity of Dark matter is the driver of structure formation
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The Great Success of LCDM
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CMB Temperature fluctuations
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The Local Void
Only 2 dwarfs are observed in the void opposed to 15 expected in LCDM Tuesday, August 10, 2010
red=SDSS blue=HIPASS black=Karachentsev etal
Peebles & Nusser, 2010, Nature
The LV phenomenon seems to be part of a bigger problem:
Tuesday, August 10, 2010
i.e. the last 8Gyr
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Merging in Simulation
Figure 3:
Tuesday, August 10, 2010
Credit Jie Wang
How do we know how much merging there is in the Universe?
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Stellar streams in the Milky Way
Tuesday, August 10, 2010
Kinematics of stars a few kpc above the midplane of the disk:
if LCDM
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probably not LCDM Tuesday, August 10, 2010
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About half of the brightest 20 galaxies with 8Mpc are pure disks just like the MW (Fisher & Kormendy 08)
Pure disk NGC4247
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Andromeda
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Therefore: There is an ``imbalance” between standard LCDM and observations on small scales.
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Partial Remedy
Increase the clustering rate on small scales!
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How do we do that?
WARNING: ONLY BETWEEN DARK MATTER PARTICLES!!!! The Baryons do not feel the extra term Tuesday, August 10, 2010
Violation of the Equivalence Principle
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Violation of the Equivalence Principle
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Violation of the Equivalence Principle
If B and E contain DM
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Acronym ReBEL=daRk Breaking Equivalence principLe
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Lorentz factor factor
kinetic term of the field
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relativistic Lagrangian of a particle
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History of scalar interactions (slide from J. Peebles):
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Lets simulate ReBEL
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ReBEL
LCDM
ReBEL
LCDM
Keselman, AN & Peebles 2010 Tuesday, August 10, 2010
LCDM
LCDM+LRSI
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AN, Gubser & Peebles 05
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Baryonic Fraction as a function of mass
McGaugh et. al. 09
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Baryonic Fraction as a function of mass from simulations
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Dynamics of Galactic satellites A test for ReBEL
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The Sagittarius dwarf/stream k
dis
15kpc
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Dynamics of infalling satellite halos/galaxies
Two important processes: a.
dynamical friction
b.
tidal stripping
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Dynamical friction (Chandrasekhar 44)
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Dynamical friction (Chandrasekhar 44)
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A very very side note: Time scale for orbit decay by DF: Time scale for Bondi growth of BH:
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V^3/(G^2 M rho) V^3/(G^2 Mbh rho)
Tidal Stripping Infalling small halo
R
BIG HALO Tuesday, August 10, 2010
Tidal Stripping Infalling small halo
R
BIG HALO Tuesday, August 10, 2010
Gravity alone
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Frieman & Gradwohl 93 and Kesden & Kamionkowski 2006 test
Galactic tidal streams are not symmetric when a ReBEL force is added! KK put a limit: beta
