Malcolm Fairbairn
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View article: The origin of the JWST supermassive black holes
The origin of the JWST supermassive black holes Open
We present a new semi-analytical model for the evolution of galaxies and supermassive black holes (SMBHs) that is based on the extended Press-Schechter formalism and phenomenological modelling of star formation. The model yields black-hole…
View article: Starlight from JWST: Implications for star formation and dark matter models
Starlight from JWST: Implications for star formation and dark matter models Open
We compared the star formation rate in different dark matter (DM) models with UV luminosity data from JWST up to z ≃ 25 and legacy data from HST. We find that a transition from a Salpeter population to top-heavy Pop III stars is likely at …
View article: Constraints on Dark Matter Models from Supermassive Black Hole Evolution
Constraints on Dark Matter Models from Supermassive Black Hole Evolution Open
A semi-analytical model for the evolution of galaxies and supermassive black holes (SMBHs) within the $Λ$CDM paradigm has been shown to yield stellar mass-BH mass relations that reproduce both the JWST and pre-JWST observations. Either fuz…
View article: Characterization of spurious-electron signals in the double-phase argon TPC of the DarkSide-50 experiment
Characterization of spurious-electron signals in the double-phase argon TPC of the DarkSide-50 experiment Open
Spurious-electron signals in dual-phase noble-liquid time projection chambers have been observed in both xenon and argon Time Projection Chambers (TPCs). This paper presents the first comprehensive study of spurious electrons in argon, usi…
View article: Non-thermal production of heavy vector dark matter from relativistic bubble walls
Non-thermal production of heavy vector dark matter from relativistic bubble walls Open
A bstract Heavy vector boson dark matter at the TeV scale or higher may be produced non-thermally in a first-order phase transition taking place at a lower energy scale. While the production of vector dark matter has previously been studie…
View article: Dilatonic Couplings and the Relic Abundance of Ultralight Dark Matter
Dilatonic Couplings and the Relic Abundance of Ultralight Dark Matter Open
Models of scalar field dark matter where the scalar is a dilaton have a special behavior, since nontrivial couplings, d, to matter result in a contribution to the potential for the field that is proportional to the trace of the stress-ener…
View article: Starlight from JWST: Implications for star formation and dark matter models
Starlight from JWST: Implications for star formation and dark matter models Open
We confront the star formation rate in different dark matter (DM) models with UV luminosity data from JWST up to $z\simeq25$ and legacy data from HST. We find that a transition from a Salpeter population to top-heavy Pop-III stars is likel…
View article: Dwarf Galaxies Imply Dark Matter Is Heavier than <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mn>2.2</mml:mn><mml:mo>×</mml:mo><mml:msup><mml:mrow><mml:mn>10</mml:mn></mml:mrow><mml:mrow><mml:mo>−</mml:mo><mml:mn>21</mml:mn></mml:mrow></mml:msup><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:mi>eV</mml:mi></mml:mrow></mml:math>
Dwarf Galaxies Imply Dark Matter Is Heavier than Open
It is widely established that a lower bound on the dark matter particle mass, m, can be obtained by demanding that the de Broglie wavelength in a given galaxy must be smaller than the virial radius of the galaxy, leading to m≳10−22 eV whe…
View article: Search for Highly Ionizing Particles in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi><mml:mi>p</mml:mi></mml:math> Collisions during LHC Run 2 Using the Full MoEDAL Detector
Search for Highly Ionizing Particles in Collisions during LHC Run 2 Using the Full MoEDAL Detector Open
This search for magnetic monopoles (MMs) and high electric charge objects (HECOs) with spins 0, 1/2, and 1, uses for the first time the full MoEDAL detector, exposed to 6.46 fb−1 proton-proton collisions at 13 TeV. The results are interpr…
View article: Primordial Black Hole Hot Spots and Nucleosynthesis
Primordial Black Hole Hot Spots and Nucleosynthesis Open
Upon their evaporation via Hawking radiation, primordial black holes (PBHs) may deposit energy in the ambient plasma on scales smaller than the typical distance between two black holes, leading to the formation of hot spots around them. We…
View article: Erratum: First Search for Dyons with the Full MoEDAL Trapping Detector in 13 TeV <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi><mml:mi>p</mml:mi></mml:math> Collisions [Phys. Rev. Lett. <b>126</b>, 071801 (2021)]
Erratum: First Search for Dyons with the Full MoEDAL Trapping Detector in 13 TeV Collisions [Phys. Rev. Lett. <b>126</b>, 071801 (2021)] Open
This corrects the article DOI: 10.1103/PhysRevLett.126.071801.
View article: Search for dark matter annual modulation with DarkSide-50
Search for dark matter annual modulation with DarkSide-50 Open
Dark matter may induce an event in an Earth-based detector, and its event rate is predicted to show an annual modulation as a result of the Earth’s orbital motion around the Sun. We searched for this modulation signature using the ionizati…
View article: What is the origin of the JWST SMBHs?
What is the origin of the JWST SMBHs? Open
We present a new semi-analytical model for the evolution of galaxies and supermassive black holes (SMBHs) that is based on the extended Press-Schechter formalism and phenomenological modelling of star formation. The model yields BH mass-st…
View article: 511 keV Galactic Photons from a Dark Matter Spike
511 keV Galactic Photons from a Dark Matter Spike Open
We propose that a dark matter (DM) spike around the Galactic Center's (GC) supermassive black hole, Sgr A*, could account for most of the bulge's measured 511 keV line intensity while remaining cosmologically compatible. DM annihilation ca…
View article: Consistency of JWST black hole observations with NANOGrav gravitational wave measurements
Consistency of JWST black hole observations with NANOGrav gravitational wave measurements Open
JWST observations have opened a new chapter in supermassive black hole (SMBH) studies, stimulating discussion of two puzzles: the abundance of high-z SMBHs and the fraction of dual active galactic nuclei (AGNs). We argue that the answers t…
View article: Supermassive black holes from inflation constrained by dark matter substructure
Supermassive black holes from inflation constrained by dark matter substructure Open
Recent James Webb Space Telescope observations of high-redshift massive galaxy candidates have initiated renewed interest in the important mystery around the formation and evolution of our Universe's largest supermassive black holes (SMBHs…
View article: MoEDAL Search in the CMS Beam Pipe for Magnetic Monopoles Produced via the Schwinger Effect
MoEDAL Search in the CMS Beam Pipe for Magnetic Monopoles Produced via the Schwinger Effect Open
We report on a search for magnetic monopoles (MMs) produced in ultraperipheral Pb-Pb collisions during Run 1 of the LHC. The beam pipe surrounding the interaction region of the CMS experiment was exposed to 184.07 μb−1 of Pb-Pb collisions…
View article: Non-thermal production of heavy vector dark matter from relativistic bubble walls
Non-thermal production of heavy vector dark matter from relativistic bubble walls Open
Heavy vector boson dark matter at the TeV scale or higher may be produced non-thermally in a first-order phase transition taking place at a lower energy scale. While the production of vector dark matter has previously been studied for bubb…
View article: Dilatonic Couplings and the Relic Abundance of Ultralight Dark Matter
Dilatonic Couplings and the Relic Abundance of Ultralight Dark Matter Open
Models of scalar field dark matter where the scalar is a dilaton have a special behaviour, since non-trivial couplings, $d$, to matter result in a contribution to the potential for the field which is proportional to the trace of the stress…
View article: Dwarf galaxies imply dark matter is heavier than $\mathbf{2.2 \times 10^{-21}} \, \mathbf{eV}$
Dwarf galaxies imply dark matter is heavier than $\mathbf{2.2 \times 10^{-21}} \, \mathbf{eV}$ Open
It is widely established that a lower bound on the dark matter particle mass, $m$, can be obtained by demanding that the de Broglie wavelength in a given galaxy must be smaller than the virial radius of the galaxy, leading to $m\gtrsim 10^…
View article: In search of the biggest bangs since the big bang
In search of the biggest bangs since the big bang Open
Many galaxies contain SuperMassive Black Holes (SMBHs), whose formation and history raise many puzzles. Pulsar timing arrays have recently discovered a low-frequency cosmological “hum” of gravitational waves that may be emitted by SMBH bin…
View article: Long-term temporal stability of the DarkSide-50 dark matter detector
Long-term temporal stability of the DarkSide-50 dark matter detector Open
The stability of a dark matter detector on the timescale of a few years is a key requirement due to the large exposure needed to achieve a competitive sensitivity. It is especially crucial to enable the detector to potentially detect any a…
View article: Magnetogenesis with gravitational waves and primordial black hole dark matter
Magnetogenesis with gravitational waves and primordial black hole dark matter Open
Strongly supercooled first-order phase transitions (FOPTs) can produce primordial black hole (PBH) dark matter (DM) along with observable gravitational waves (GWs) from bubble collisions. Such FOPTs may also produce coherent magnetic field…
View article: Consistency of JWST Black Hole Observations with NANOGrav Gravitational Wave Measurements
Consistency of JWST Black Hole Observations with NANOGrav Gravitational Wave Measurements Open
JWST observations have opened a new chapter in studies of supermassive black holes (SMBHs), stimulating discussion of two puzzles: the abundance of SMBHs in the early Universe and the fraction of dual AGNs. In this paper we argue that the …
View article: On stellar migration from Andromeda to the Milky Way
On stellar migration from Andromeda to the Milky Way Open
Recent Gaia observations suggest that some hypervelocity stars (HVSs) might originate from outside the Galaxy. We ask whether these HVSs could come from as far as Andromeda. Therefore, we simulate HVSs originating in Andromeda with initial…
View article: Probing Supermassive Black Hole Seed Scenarios with Gravitational-wave Measurements
Probing Supermassive Black Hole Seed Scenarios with Gravitational-wave Measurements Open
The process whereby the supermassive black holes (SMBHs) populating the centers of galaxies have been assembled remains to be established, with the relative importance of seeds provided by collapsed Population III stars, black holes formed…
View article: MoEDAL search in the CMS beam pipe for magnetic monopoles produced via the Schwinger effect
MoEDAL search in the CMS beam pipe for magnetic monopoles produced via the Schwinger effect Open
We report on a search for magnetic monopoles (MMs) produced in ultraperipheral Pb--Pb collisions during Run-1 of the LHC. The beam pipe surrounding the interaction region of the CMS experiment was exposed to 184.07 \textmu b$^{-1}$ of Pb--…
View article: Axion star explosions: A new source for axion indirect detection
Axion star explosions: A new source for axion indirect detection Open
If dark matter is composed of axions, then axion stars form in the cores of dark matter halos. These stars are unstable above a critical mass, decaying to radio photons that heat the intergalactic medium, offering a new channel for axion i…
View article: What is the source of the PTA GW signal?
What is the source of the PTA GW signal? Open
The most conservative interpretation of the nHz stochastic gravitational wave background (SGWB) discovered by NANOGrav and other pulsar timing array (PTA) collaborations is astrophysical, namely that it originates from supermassive black h…
View article: Gravitational waves from supermassive black hole binaries in light of the NANOGrav 15-year data
Gravitational waves from supermassive black hole binaries in light of the NANOGrav 15-year data Open
The NANOGrav and other pulsar timing arrays (PTAs) have recently announced evidence for nHz gravitational waves (GWs) that may originate from supermassive black hole (SMBH) binaries. The spectral index of the GW signal differs from that pr…