Red quasars are intrinsically X-ray weak with low alpha_OX values, tracing a distinct evolutionary stage of suppressed black hole accretion relative to stellar mass growth.
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Non-equilibrium relativistic SIDM halo collapse produces seed black holes of mass ~3e-8 of the halo mass at apparent horizon formation.
SDSS-WISE coordinate offsets plus red WISE colors pre-select advanced mergers likely to host unresolved dual-AGN candidates, with Keck AO confirming substructure in 20 of 46 targets at 43 percent yield.
Four dual LRD candidates at z~5.5 with kpc separations show 20-30x excess sub-arcsec clustering versus extrapolated AGN ACF, implying merger-driven SMBH growth.
JWST spectroscopy of 295 galaxies at 5.5 < z < 14.3 shows UV slope beta reddening at z > 9.5, with lack of dust as the main driver of bluer values and nebular continuum at T > 15,000 K able to reproduce the observed range without dust.
JWST UV luminosity function calibration of reionization history bounds primordial magnetic fields to √<B²> < 0.27 nG (n_B=-2) and < 0.18 nG (n_B=2) at 95% CL by ruling out double reionization at z≈24.
Monte Carlo solutions to the Smoluchowski coagulation equation yield runaway timescales and mass evolution for primordial black hole clusters at different redshifts based on cluster properties.
Axion dark matter rethermalization in collapsing overdensities near cosmic dawn transports angular momentum outward fast enough to form black holes of 10^5 to 10^10 solar masses for QCD axions and similar particles above 10^{-16} eV/c^2.
A large collaboration compiles and compares merger rate predictions for massive black holes across multiple galaxy formation models to forecast LISA detections and quantify uncertainties.
Stellar-mass primordial black holes have minor impact on primordial star formation while supermassive ones can seed massive early structures explaining apparent overabundance of high-redshift galaxies.
Supermassive black holes form naturally at cosmic dawn when dark matter is axions or axion-like particles with mass above 10^{-16} eV/c².
LISA is a planned space mission using laser interferometry between three spacecraft to detect gravitational waves from galactic binaries, stellar-mass black holes, massive black-hole mergers, and the universe's expansion.
citing papers explorer
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SDSS-V: Revealing a weak accretion state in X-ray selected red quasars
Red quasars are intrinsically X-ray weak with low alpha_OX values, tracing a distinct evolutionary stage of suppressed black hole accretion relative to stellar mass growth.
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Non-Equilibrium Relativistic Core Collapse of Self-Interacting Dark Matter Halos -- Limits On Seed Black Hole Mass
Non-equilibrium relativistic SIDM halo collapse produces seed black holes of mass ~3e-8 of the halo mass at apparent horizon formation.
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A High Resolution Search for Dual AGN Candidates in Mergers: A Pre-Selection Strategy using Keck AO
SDSS-WISE coordinate offsets plus red WISE colors pre-select advanced mergers likely to host unresolved dual-AGN candidates, with Keck AO confirming substructure in 20 of 46 targets at 43 percent yield.
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Hidden in Pixels I: Discovery of dual "little red dots" indicates excess clustering on kilo-parsec scales
Four dual LRD candidates at z~5.5 with kpc separations show 20-30x excess sub-arcsec clustering versus extrapolated AGN ACF, implying merger-driven SMBH growth.
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Hitting the slopes: A spectroscopic view of UV continuum slopes of galaxies reveals a reddening at z > 9.5
JWST spectroscopy of 295 galaxies at 5.5 < z < 14.3 shows UV slope beta reddening at z > 9.5, with lack of dust as the main driver of bluer values and nebular continuum at T > 15,000 K able to reproduce the observed range without dust.
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JWST Constraints on Primordial Magnetic Fields
JWST UV luminosity function calibration of reionization history bounds primordial magnetic fields to √<B²> < 0.27 nG (n_B=-2) and < 0.18 nG (n_B=2) at 95% CL by ruling out double reionization at z≈24.
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Smoluchowski Coagulation Equation and the Evolution of Primordial Black Hole Clusters
Monte Carlo solutions to the Smoluchowski coagulation equation yield runaway timescales and mass evolution for primordial black hole clusters at different redshifts based on cluster properties.
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Supermassive black hole formation in the initial collapse of axion dark matter
Axion dark matter rethermalization in collapsing overdensities near cosmic dawn transports angular momentum outward fast enough to form black holes of 10^5 to 10^10 solar masses for QCD axions and similar particles above 10^{-16} eV/c^2.
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The LISA Astrophysics MBHcatalogues Project: A comparison of predictions of simulated massive black hole binaries
A large collaboration compiles and compares merger rate predictions for massive black holes across multiple galaxy formation models to forecast LISA detections and quantify uncertainties.
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Impact of primordial black holes on the formation of the first stars and galaxies
Stellar-mass primordial black holes have minor impact on primordial star formation while supermassive ones can seed massive early structures explaining apparent overabundance of high-redshift galaxies.
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Axions explain the formation of supermassive black holes at cosmic dawn
Supermassive black holes form naturally at cosmic dawn when dark matter is axions or axion-like particles with mass above 10^{-16} eV/c².
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LISA Definition Study Report
LISA is a planned space mission using laser interferometry between three spacecraft to detect gravitational waves from galactic binaries, stellar-mass black holes, massive black-hole mergers, and the universe's expansion.