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Related Concept Videos

Detection of Black Holes01:10

Detection of Black Holes

Although black holes were theoretically postulated in the 1920s, they remained outside the domain of observational astronomy until the 1970s.
Their closest cousins are neutron stars, which are composed almost entirely of neutrons packed against each other, making them extremely dense. A neutron star has the same mass as the Sun but its diameter is only a few kilometers. Therefore, the escape velocity from their surface is close to the speed of light.
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Schwarzschild Radius and Event Horizon

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Membrane lipids such as phosphatidylinositol (PI) are precursors for several membrane-bound and soluble second messengers. Specific kinases phosphorylate PI and produce phosphorylated inositol phospholipids. One such inositol phospholipids are the  phosphatidylinositol-4,5 bisphosphate [PI(4,5)P2], present in the inner half of the lipid bilayer. Upon ligand binding, GPCR stimulates Gq proteins to turn on phospholipase Cꞵ. Activated phospholipase Cꞵ cleaves PI(4,5)P2 and produces two-second...
Deactivation Processes: Jablonski Diagram01:25

Deactivation Processes: Jablonski Diagram

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Magnetic Field Lines

The representation of magnetic fields by magnetic field lines is very useful in visualizing the strength and direction of the magnetic field. Each of the magnetic field lines forms a closed loop. The field lines emerge from the north pole (N), loop around to the south pole (S), and continue through the bar magnet back to the north pole.
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Photoreceptors and Visual Pathways

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Updated: Jun 28, 2026

Quantifying Intermembrane Distances with Serial Image Dilations
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Primordial-Black-Hole-Based Pathways to Little Red Dots.

Valerio De Luca1, Loris Del Grosso1, Gabriele Franciolini2,3,4

  • 1Johns Hopkins University, William H. Miller III Department of Physics and Astronomy, 3400 North Charles Street, Baltimore, Maryland 21218, USA.

Physical Review Letters
|June 26, 2026
PubMed
Summary
This summary is machine-generated.

The James Webb Space Telescope discovered Little Red Dots (LRDs) with unexpectedly massive black holes (BHs). Primordial black holes (PBHs) are unlikely direct hosts, but mergers and gas accretion onto PBHs offer potential explanations for these early universe BHs.

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Area of Science:

  • Cosmology
  • Astrophysics
  • Galaxy Formation

Background:

  • James Webb Space Telescope (JWST) observations reveal compact, high-redshift sources known as Little Red Dots (LRDs).
  • These LRDs host supermassive black holes (BHs) disproportionately massive compared to their stellar content, challenging current galaxy formation models.
  • The observed properties suggest LRDs might be an extreme class of early BH hosts.

Purpose of the Study:

  • Investigate the potential primordial origin of supermassive black holes (BHs) observed in early universe LRDs.
  • Evaluate the viability of primordial black holes (PBHs) as progenitors for the massive BHs in LRDs.
  • Explore formation channels, including mergers and gas accretion, that could explain the observed BH properties in LRDs.

Main Methods:

  • Rule out direct formation of observed BH masses in the early universe using cosmic microwave background (CMB) μ-distortion limits.
  • Model the hierarchical mergers of lighter, observationally allowed primordial black holes (PBHs) to form massive BHs.
  • Estimate gas accretion onto intermediate-mass PBHs while tracking metallicity evolution to match LRD properties.

Main Results:

  • Direct formation of the observed BH masses in the early universe is excluded by CMB μ-distortion constraints.
  • Hierarchical mergers of PBHs can form massive BHs but face challenges due to the rarity of required high-redshift dark matter halos.
  • Gas accretion onto intermediate-mass PBHs, coupled with metallicity evolution, can reproduce the observed properties of LRDs within specific parameter spaces.

Conclusions:

  • Primordial black holes (PBHs) are unlikely to form directly to the observed masses in LRDs.
  • While PBH mergers are plausible, they struggle to explain the abundance of LRDs.
  • Gas accretion onto intermediate-mass PBHs presents a viable channel for forming the massive black holes observed in Little Red Dots (LRDs), particularly in the lensed source QSO1.