71 citations · 362 across the 29 of their papers we have counts for
29 papers
JWST's Little Red Dots as collapsed Supermassive Dark Stars
Cosmin Ilie
The nature of the ``Little Red Dots'' (LRDs) is one of the most profound mysteries posed by the JWST data. One promising class of models that can reproduce the observed LRDs spectr…
Early Formation of Supermassive Black Holes via Dark Star Gravitational Instability
Katherine Freese, George M. Fuller, Sohan Ghodla +4
We show that dark stars, which are dark-matter-powered stars in the early universe, can grow by accretion to masses in the range $\mathscr{O}\left ({10}^4\right )-\mathscr{O}\left…
Neural Network identification of Dark Star Candidates. II. Spectroscopy
Adiba Amira Siddiqa, Sayed Shafaat Mahmud, Cosmin Ilie
Some of the first stars in the Universe might be powered by Dark Matter (DM) annihilations, rather than nuclear fusion. Those objects, i.e. Dark stars (DS), offer a unique window i…
Supermassive Dark Stars and their remnants as a possible solution to three recent cosmic dawn puzzles
Cosmin Ilie, Jillian Paulin, Andreea Petric +1
The James Webb Space Telescope (JWST) has begun to revolutionize our view of the Cosmos. The discovery of Blue Monsters (i.e., ultra-compact yet very bright high-z galaxies) and th…
Neural Network identification of Dark Star Candidates. I. Photometry
Sayed Shafaat Mahmud, Adiba Amira Siddiqa, Cosmin Ilie
The formation of the first stars in the universe could be significantly impacted by the effects of Dark Matter (DM). Namely, if DM is in the form of Weakly Interacting Massive Part…
Reconstructing PTA measurements via early seeding of supermassive black holes
Sohan Ghodla, Cosmin Ilie
Motivated by recent findings that PTA's nHz signal may be dominated by supermassive black hole (SMBH) binaries (), and high redshift quasar observations rev…
Spectroscopic Supermassive Dark Star candidates
Cosmin Ilie, Sayed Shafaat Mahmud, Jillian Paulin +1
Dark Stars, i.e. early stars composed almost entirely of hydrogen and helium but powered by Dark Matter, could form in zero metallicity clouds located close to the center of high r…
Constraining Asymmetric DM Properties by Black Hole Formation in Neutron Stars and Population III Stars
Jared Diks, Cosmin Ilie
In this work we explore the potential for Neutron Stars (NSs) at the Galactic center and Population~III stars to constrain bosonic Asymmetric Dark Matter (ADM). We demonstrate that…
Dark Sector Tunneling Field Potentials for a Dark Big Bang
Richard Casey, Cosmin Ilie
All of the significant evidence for dark matter observed thus far has been through its gravitational interactions. After 40 years of direct detection experiments, the parameter spa…
Closed-form expressions for multiscatter Dark Matter capture rates
Cosmin Ilie
Any astrophysical object can, in principle, serve as a probe of the interaction between Dark Matter and regular, baryonic matter. This method is based on the potential observable c…
The effectiveness of exoplanets and Brown Dwarfs as sub-GeV Dark Matter detectors
Cosmin Ilie, Caleb Levy, Jared Diks
In this work we demonstrate that Dark Matter (DM) evaporation severely hinders the effectiveness of exoplanets and Brown Dwarfs as sub-GeV DM probes. Moreover, we find useful analy…
UHZ1 and the other three most distant quasars observed: possible evidence for Supermassive Dark Stars
Cosmin Ilie, Katherine Freese, Andreea Petric +1
The James Webb Space Telescope (JWST) has recently uncovered a new record-breaking quasar, UHZ1, at a redshift of . This discovery continues JWST's trend of confronting th…
Detectability of Supermassive Dark Stars with the Roman Space Telescope
Saiyang Zhang, Cosmin Ilie, Katherine Freese
The first bright objects to form in the Universe at redshift might have been Dark Stars, made primarily of hydrogen and helium but powered by dark matter. In this st…
Supermassive Dark Star candidates seen by JWST?
Cosmin Ilie, Jillian Paulin, Katherine Freese
The first generation of stars in the Universe is yet to be observed. There are two leading theories for those objects that mark the beginning of the cosmic dawn: hydrogen burning P…
Analytic Approximations for the Velocity Suppression of Dark Matter Capture
Cosmin Ilie, Jillian Paulin
Compact astrophysical objects have been considered in the literature as dark matter (DM) probes, via the observational effects of annihilating captured DM. In this respect, Populat…
Multicomponent multiscatter capture of Dark Matter
Cosmin Ilie, Caleb Levy
In recent years, the usefulness of astrophysical objects as Dark Matter (DM) probes has become more and more evident, especially in view of null results from direct detection and p…
Probing below the neutrino floor with the first generation of stars
Cosmin Ilie, Caleb Levy, Jacob Pilawa +1
We show that the mere observation of the first stars (Pop III stars) in the universe can be used to place tight constraints on the strength of the interaction between dark matter a…
Constraining Dark Matter properties with the first generation of stars
Cosmin Ilie, Caleb Levy, Jacob Pilawa +1
Dark Matter (DM) can be trapped by the gravitational field of any star, since collisions with nuclei in dense environments can slow down the DM particle below the escape velocity (…
Comment on "Multiscatter stellar capture of dark matter"
Cosmin Ilie, Jacob Pilawa, Saiyang Zhang
Bramante, Delgado, and Martin [Phys. Rev. D96, 063002(2017)., hereafter BDM17] extended the analytical formalism of dark matter (DM) capture in a very important way, which allows,…
Multiscatter capture of superheavy dark matter by Pop. III stars
Cosmin Ilie, Saiyang Zhang
If captured by the gravitational field of stars or other compact objects, dark matter can self-annihilate and produce a potentially detectable particle flux. In the case of superhe…
Gamma Ray polarimetry; a new window for the non-thermal Universe
Cosmin Ilie
Over the past few decades impressive progress has been made in the field of photon polarimetry, especially in the hard X-ray and soft gamma-ray energy regime. Measurements of the l…
Quasidecoupled state for dark matter in nonstandard thermal histories
Isaac Raj Waldstein, Adrienne L. Erickcek, Cosmin Ilie
Dark matter drops out of kinetic equilibrium with standard model particles when the momentum-transfer rate equals the expansion rate. In a radiation-dominated universe, this occurs…
Uniformity of Cosmic Microwave Background as a Non-Inflationary Geometrical Effect
Branislav Vlahovic, Maxim Eingorn, Cosmin Ilie
The conventional CDM cosmological model supplemented by the inflation concept describes the Universe very well. However, there are still a few concerns: new Planck data impose c…
High energy photon polarimeter for astrophysics
Maxim Eingorn, Lakma Fernando, Branislav Vlahovic +6
A high-energy photon polarimeter for astrophysics studies in the energy range from 10 MeV to 800 MeV is considered. The proposed concept uses a stack of silicon micro-strip detecto…