84 citations · 202 across the 10 of their papers we have counts for
10 papers
Direct Collapse Supermassive Black Holes from Ultralight Dark Matter
Hao Jiao, Robert Brandenberger, Vahid Kamali
We study the possibility that parametric resonant excitation of photons in an ultralight dark matter halo could generate the required flux of Lyman-Werner photons to allow the dire…
Cosmological Magnetic Fields from Ultralight Dark Matter
Robert Brandenberger, Jürg Fröhlich, Hao Jiao
We propose a mechanism for the generation of magnetic fields on cosmological scales that is operative after recombination. An essential ingredient is an instability (of parametric…
Investigating cosmic strings using large-volume hydrodynamical simulations in the context of JWST's massive UV-bright galaxies
Sonja M. Koehler, Hao Jiao, Rahul Kannan
Recent observations from the James Webb Space Telescope (JWST) have uncovered an unexpectedly large abundance of massive, UV-bright galaxies at high redshifts, presenting a signifi…
N-Body Simulation of Early Structure Formation from Cosmic String Loops
Hao Jiao, Robert Brandenberger, Alexandre Refregier
By means of N-body simulations, we study early structure formation in the presence of a scaling distribution of cosmic string loops. Cosmic string loops dominate the high redshift…
Accretion onto Oscillating Cosmic String Loops
Hao Jiao, Bryce Cyr, Robert Brandenberger
Cosmic string loops are non-linear density fluctuations which form in the early universe and could play an important role in explaining many phenomena which are in tension with the…
The nanohertz stochastic gravitational wave background from cosmic string loops and the abundant high redshift massive galaxies
Ziwei Wang, Lei Lei, Hao Jiao +2
Recently, pulsar timing array (PTA) experiments have provided compelling evidence for the existence of the nanohertz stochastic gravitational wave background (SGWB). In this work,…
Early Structure Formation from Cosmic String Loops in Light of Early JWST Observations
Hao Jiao, Robert Brandenberger, Alexandre Refregier
Cosmic strings, if they exist, source nonlinear and non-Gaussian perturbations all the way back to the time of equal matter and radiation (and earlier). Here, we compute the mass f…
Massive black holes at high redshifts from superconducting cosmic strings
Bryce Cyr, Hao Jiao, Robert Brandenberger
The observation of quasars at high redshifts presents a mystery in the theory of black hole formation. In order to source such objects, one often relies on the presence of heavy se…
Intermediate Mass Black Hole Seeds from Cosmic String Loops
Robert Brandenberger, Bryce Cyr, Hao Jiao
We demonstrate that cosmic string loops may provide a joint resolution of two mysteries surrounding recently observed black holes. For a string tension in an appropriate range, lar…
Cosmic Textures and Global Monopoles as Seeds for Super-Massive Black Holes
Robert Brandenberger, Hao Jiao
We compute the number density of nonlinear seed fluctuations which have the right number density to be able to explain the presence of one supermassive black hole per galaxy, as a…