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A common origin of Baryons and Dark Matter via gravitational - - PowerPoint PPT Presentation

Jun 27, 2023 282 likes •537 views

A common origin of Baryons and Dark Matter via gravitational collapse of Primordial Black Holes arXiv:1904.02129 Solvay Workshop, 4 th April 2019 Juan Garca-Bellido IFT-UAM/CSIC Madrid Outline Introduction - LIGO Gravitational Waves

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arXiv:1904.02129 Solvay Workshop, 4th April 2019

Juan García-Bellido IFT-UAM/CSIC Madrid

A common origin of Baryons and Dark Matter via gravitational collapse of Primordial Black Holes

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Outline

  • Introduction
  • LIGO Gravitational Waves from BH Binaries
  • Mass and Spin as a hint to PBH nature
  • Novel scenario
  • Solar mass PBH form at quark-hadron trans.
  • Gravitational collapse of hot plasma induces

Hot Spot EW baryogenesis at QCD

  • Similar density of Baryons and DM = PBH
  • Stochastic spectator field = QCD axion
  • Overview and predictions
  • Conclusions
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10 LVC BHB events (O1+O2) [many more in run O3]

LVC (2018)

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If LIGO detects a single BH with M < 1Msun it will necessarily be

  • f primordial origin, not stellar.

LVC BHB events

Given the present rate O1-O2 R ~ 20-120 events/yr/Gpc3 soon O3 will have MANY events. Will test lognormal distribution. Observed rate of events is OK with clustered wide-mass distr. Chirp mass

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Black Holes and Neutron Stars

Massive BHB Astrophysical BH Gap M < Chandrasekhar mass Solar Mass GW X-rays Radio Microlensing

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LVC BHB event rate

Clesse & JGB (2016-18)

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Effective aligned spin Effective precession spin

GW170817 GW170608 GW151226 GW151012 GW170104 GW170814 GW170809 GW170818 GW150914 GW170823 GW170729

0.00 0.25 0.50 0.75 1.00 χp

G W 1 7 8 1 7 G W 1 7 6 8 G W 1 5 1 2 2 6 G W 1 5 1 1 2 G W 1 7 1 4 G W 1 7 8 1 4 G W 1 7 8 9 G W 1 7 8 1 8 G W 1 5 9 1 4 G W 1 7 8 2 3 G W 1 7 7 2 9

−1.0 −0.5 0.0 0.5 1.0 χeff

Spin distribution of LVC BHB

LVC (2018) LVC (2018)

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PBH are ~ spinless

Stellar BH PBH = Mass

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Inflation

N=ln a/aend N=0

  • 20
  • 60
  • 50
  • 40
  • 30
  • 10

1/(aH) a0 rec eq BBN QCD PBH 1/(aH) Inflation Radiation Matter Horizon crossing

PBH

1/k comoving scale EW

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Gravitational Collapse of PBH

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Origin of PBH mass

Chandrasekhar mass (Pauli exclusion) Mass within the horizon at QCD

LIGO range!

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Origin of PBH mass

Softening the equation of state @ QCD

Byrnes et al. (2018) Jedamzik (1997)

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Matter-radiation equality

Fraction domains @ PBH formation

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Is this a hint of a common origin? Our scenario

We propose “hot spot” EWB associated with localized energy released during gravitational collapse at PBH formation in the quark-hadron transition

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Electroweak baryogenesis @ QCD

Sakharov conditions: B, C, CP, non-equil. CP in the SM (CKM matrix)

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Electroweak baryogenesis @ QCD

Out-of-equilibrium gravitational collapse

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Electroweak baryogenesis @ QCD

B in the SM: Sphaleron transitions & chiral anomaly

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Electroweak baryogenesis @ QCD

Putting all together

Asaka et al. (2004)

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Electroweak baryogenesis @ QCD

Diffusion to the rest of the universe

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Origin large curvature fluctuations

Stochastic spectator (curvaton) field QCD axion (strong CP problem)

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Origin large curvature fluctuations

QCD axion as spectator field

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0 two-fold 1 two-fold 2 two-folds 3 two-folds 4 two-folds 5 two-folds 6 two-folds 7 two-folds 8 two-folds 9 two-folds

Evolution of the stochastic spectator field (eg. QCD axion) in our patch:

T=150 MeV T=125 MeV T=100 MeV

  • 2¥1018
  • 1¥1018

1¥1018 2¥1018 0.0000 0.00002 0.00004 0.00006 0.00008 0.0001 a @GeVD VHaL @GeV4 D

a(x) hai

hai ' aend

slow-roll region

These regions will collapse and form PBH with different masses Coarse-grained multiverse

hai ' aend

no Dark Matter Universe Universe with 2 inflation phases

  • ur patch
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Predictions for PBH mass spectrum

0.01 0.10 1 10 100 10-5 10-4 0.001 0.010 0.100 1 MPBH (MΘ) fPBH

20 MeV 120 MeV 1 GeV

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Axion dominance PBH=DM collapse 200 MeV quark-hadron transition Baryogenesis hot-spot EWB 100 MeV baryon diffusion light elements 10 MeV 1 MeV Nucleosynthesis

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Conclusions

  • SM physics can explain both DM and BAU.
  • Smallness of BAU is due to the small number of

Hubble domains that collapse to form PBH.

  • The quark-hadron QCD transition triggers the

collapse of PBH and BAU via “Hot spot” EWB.

  • Dark matter density in the form of PBH is then
  • f the same order as Baryon density.
  • It also explains why PBH have masses ~ Msun.
  • The predicted PBH mass distribution (features)

could be measured by LIGO/Virgo in the near future.