Primordial black holes from Higgs inflation? Eemeli Tomberg - PowerPoint PPT Presentation

Primordial black holes from Higgs inflation? Eemeli Tomberg 27.5.2019 [1810.12608] In collaboration with Syksy Räsänen Eemeli Tomberg University of Helsinki Primordial black holes from Higgs inflation? 1 / 13

Primordial black holes (PBHs) ◮ Black holes formed in the early universe ◮ Dark matter candidate ◮ Observable by GW detectors? Eemeli Tomberg University of Helsinki Primordial black holes from Higgs inflation? 2 / 13

PBHs as dark matter [1705.05567] Eemeli Tomberg University of Helsinki Primordial black holes from Higgs inflation? 3 / 13

Origin of PBHs ◮ A possible origin: primordial density perturbations from cosmic inflation Eemeli Tomberg University of Helsinki Primordial black holes from Higgs inflation? 4 / 13

Higgs inflation ◮ Standard Model Higgs, coupled non-minimally to gravity, drives cosmic inflation � � d 4 x √− g − 1 R + 1 2 g µν ∂ µ h ∂ ν h − λ � M 2 + ξ h 2 � � 4 h 4 S = 2 Eemeli Tomberg University of Helsinki Primordial black holes from Higgs inflation? 5 / 13

Higgs inflation ◮ “Einstein frame potential”: ◮ Compatible with Planck CMB results; in particular, n s = 0 . 9625 ± 0 . 0048 [1807.06211] Eemeli Tomberg University of Helsinki Primordial black holes from Higgs inflation? 6 / 13

PBHs from a feature in the potential ◮ Feature from quantum corrections to effective potential Eemeli Tomberg University of Helsinki Primordial black holes from Higgs inflation? 7 / 13

Quantum corrections ◮ Model is non-renormalizable ◮ At large field values, can use effective field theory: chiral SM ◮ Freedom in connecting this to electroweak scale physics (jumps in couplings) Eemeli Tomberg University of Helsinki Primordial black holes from Higgs inflation? 8 / 13

Quantum corrections ◮ Scan over all quantum-corrected potentials with a suitable feature ◮ Check PBH formation for them Eemeli Tomberg University of Helsinki Primordial black holes from Higgs inflation? 9 / 13

Results U χ ◮ PBH abundance can be fine-tuned Eemeli Tomberg University of Helsinki Primordial black holes from Higgs inflation? 10 / 13

Results ◮ PBH mass: ◮ Discrepancy between PBH limits and CMB measurements Eemeli Tomberg University of Helsinki Primordial black holes from Higgs inflation? 11 / 13

Planck scale dark matter? ◮ In Higgs inflation, measured n s is only compatible with small PBHs ◮ These evaporate quickly by Hawking radiation ◮ IF Planck mass relics left behind: these could constitute DM Eemeli Tomberg University of Helsinki Primordial black holes from Higgs inflation? 12 / 13

Conclusions ◮ PBHs can be produced abundantly in Higgs inflation ◮ Big black holes not compatible with CMB observations ◮ Planck mass relics as DM still possible Eemeli Tomberg University of Helsinki Primordial black holes from Higgs inflation? 13 / 13