THE NATURE OF LIGHT DARK MATTER Peter L. Biermann ...

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The first stars • Star formation triggered early • Early magnetic fields from first massive stars – the fastest process – then cosmic ray driven dynamo process in galactic disks, implies by necessity galactic winds • Reionization from first massive stars at z > 10 • Energy input from stellar winds and supernovae • Chemical enrichment from first massive stars (Wolf Rayet star winds and supernovae) • First dust • First Gamma Ray Bursts • First stellar black holes • First cosmic rays 8
Primordial magnetic fields • Ionization by secondary electron, from ionization: • The time scale for energy gain (e.g., Jokipii 2004) τ A = 4κ V 2 A (1) • Assuming B2 /8π I(k)k 1 and I(k) ∼ k−1 to just cancel the energy loss by ionization B(z = 100) < 2 10−8 Gauß, corresponding to today B < 4 10 −12 Gauß. (2) • K. Dolag et al. (2002, 2005): B < (0.2 − 1.) × 10 −12 Gauß from structure formation simulations: consistent ! 9
Page 1 and 2: THE NATURE OF LIGHT DARK MATTER Pet
Page 3 and 4: Dark Matter: Some history Sterile n
Page 5 and 6: Background • They can be produced
Page 7: First star formation • Sterile ne
Page 11 and 12: X-ray background • 2005 - 2007: B
Page 13 and 14: Galaxies Work of group around G. Gi
Page 15 and 16: Acknowledgements Support for PLB is
Page 17 and 18: M., Patel, M., Phys. Rev. D 64, id.
Page 19 and 20: [16] “Ultra high energy cosmic ra
Page 21 and 22: [25] “Pulsar kicks from neutrino
Page 23 and 24: [35] “The νMSM, dark matter and
Page 25: [43] “Early Structure Formation a

THE NATURE OF LIGHT DARK MATTER Peter L. Biermann ...

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