214 citations · 3.9k across the 98 of their papers we have counts for
99 papers
Profiling stellar environments of gravitational wave sources
Avinash Tiwari, Aditya Vijaykumar, Shasvath J. Kapadia +2
Gravitational waves (GWs) have enabled direct detections of compact binary coalescences (CBCs). However, their poor sky localisation and the typical lack of observable electromagne…
IMBH Progenitors from Stellar Collisions in Dense Star Clusters
Elena González Prieto, Newlin C. Weatherford, Giacomo Fragione +2
Very massive stars (VMSs) formed via a sequence of stellar collisions in dense star clusters have been proposed as the progenitors of massive black hole seeds. VMSs could indeed co…
Remnant masses from 1D+ core-collapse supernovae simulations: bimodal neutron star mass distribution and black holes in the low-mass gap
Luca Boccioli, Giacomo Fragione
The explosion of core-collapse supernovae (CCSNe) is an extremely challenging problem, and there are still large uncertainties regarding which stars lead to successful explosions t…
On the Stochastic Gravitational Wave Background from Binary Black Hole Mergers Dynamically Assembled in Dense Star Clusters
Xiao-Xiao Kou, Giacomo Fragione, Vuk Mandic
With about a hundred binary black hole (BBH) mergers detected by LIGO-Virgo-KAGRA, and with several hundreds expected in the current O4 run, GWs are revolutionizing our understandi…
Binary black hole mergers and intermediate-mass black holes in dense star clusters with collisional runaways
Rujuta A. Purohit, Giacomo Fragione, Frederic A. Rasio +2
Intermediate-mass black holes (IMBHs) are believed to be the missing link between the supermassive black holes (BHs) found at the centers of massive galaxies and BHs formed through…
Stellar Escape from Globular Clusters. II. Clusters May Eat Their Own Tails
Newlin C. Weatherford, Frederic A. Rasio, Sourav Chatterjee +3
We apply for the first time the Monte Carlo star cluster modeling method to study tidal tail and stellar stream formation from globular clusters, assuming a circular orbit in a smo…
The dominant mechanism(s) for populating the outskirts of star clusters with neutron star binaries
Nathan W. C. Leigh, Claire S. Ye, Steffani M. Grondin +3
It has been argued that heavy binaries composed of neutron stars (NSs) and millisecond pulsars (MSPs) can end up in the outskirts of star clusters via an interaction with a massive…
Constraining the Properties of Black Hole Seeds from the Farthest Quasars
Giacomo Fragione, Fabio Pacucci
Over 60 years after the discovery of the first quasar, more than such sources are identified in the epoch of reionization at . JWST is now exploring higher redshifts ($z…
Accelerated binary black holes in globular clusters: forecasts and detectability in the era of space-based gravitational-wave detectors
Avinash Tiwari, Aditya Vijaykumar, Shasvath J. Kapadia +2
The motion of the center of mass of a coalescing binary black hole (BBH) in a gravitational potential imprints a line-of-sight acceleration (LOSA) onto the emitted gravitational wa…
Roman CCS White Paper: Characterizing the Galactic population of isolated black holes
Casey Y. Lam, Natasha Abrams, Jeff Andrews +34
Although there are estimated to be 100 million isolated black holes (BHs) in the Milky Way, only one has been found so far, resulting in significant uncertainty about their propert…
Globular cluster formation histories, masses and radii inferred from gravitational waves
Maya Fishbach, Giacomo Fragione
Globular clusters (GCs) are found in all types of galaxies and harbor some of the most extreme stellar systems, including black holes that may dynamically assemble into merging bin…
Neutron star kicks and implications for their rotation at birth
Giacomo Fragione, Abraham Loeb
Neutron stars are born out of core-collapse supernovae, and they are imparted natal kicks at birth as a consequence of asymmetric ejection of matter and possibly neutrinos. Unless…
A long-duration gamma-ray burst of dynamical origin from the nucleus of an ancient galaxy
Andrew J. Levan, Daniele B. Malesani, Benjamin P. Gompertz +29
The majority of long duration ( s) gamma-ray bursts (GRBs) are believed to arise from the collapse of massive stars \cite{Hjorth+03}, with a small proportion created from the m…
On the Tidal Capture of White Dwarfs by Intermediate-mass Black Holes in Dense Stellar Environments
Claire S. Ye, Giacomo Fragione, Rosalba Perna
Intermediate-mass black holes (IMBHs) are the missing link between stellar-mass and supermassive black holes, widely believed to reside in at least some dense star clusters, but no…
LISA Constraints on an Intermediate-Mass Black Hole in the Galactic Centre
Vladimir Strokov, Giacomo Fragione, Emanuele Berti
Galactic nuclei are potential hosts for intermediate-mass black holes (IMBHs), whose gravitational field can affect the motion of stars and compact objects. The absence of observab…
Demographics of Hierarchical Black Hole Mergers in Dense Star Clusters
Giacomo Fragione, Frederic A. Rasio
With about a hundred mergers of binary black holes (BBHs) detected via gravitational waves by the LIGO-Virgo-KAGRA (LVK) Collaboration, our understanding of the darkest objects in…
On the Likely Dynamical Origin of GW191109 and of Binary Black Hole Mergers with Negative Effective Spin
Rachel C. Zhang, Giacomo Fragione, Chase Kimball +1
With the growing number of binary black hole (BBH) mergers detected by LIGO/Virgo/KAGRA, several systems have become difficult to explain via isolated binary evolution, having comp…
Constraining the cosmic merger history of intermediate-mass black holes with gravitational wave detectors
Giacomo Fragione, Abraham Loeb
Intermediate-mass black holes (IMBHs) have not been detected beyond any reasonable doubt through either dynamical or accretion signatures. Gravitational waves (GWs) represent an un…
Stellar Escape from Globular Clusters. I. Escape Mechanisms and Properties at Ejection
Newlin C. Weatherford, Fulya Kıroğlu, Giacomo Fragione +3
The theory of stellar escape from globular clusters (GCs) dates back nearly a century, especially the gradual evaporation of GCs via two-body relaxation coupled with external tides…
Growing Black Holes through Successive Mergers in Galactic Nuclei: I. Methods and First Results
Dany Atallah, Alessandro A. Trani, Kyle Kremer +4
We present a novel, few-body computational framework designed to shed light on the likelihood of forming intermediate-mass (IM) and supermassive (SM) black holes (BHs) in nuclear s…
Partial Tidal Disruption of Main-Sequence Stars by Intermediate-Mass Black Holes
Fulya Kıroğlu, James C. Lombardi, Kyle Kremer +3
We study close encounters of a middle-age main-sequence star (modeled using MESA) with massive black holes through hydrodynamic simulations, and explore in particula…
Intermediate-mass Black Holes on the Run from Young Star Clusters
Elena González Prieto, Kyle Kremer, Giacomo Fragione +4
The existence of black holes (BHs) with masses in the range between stellar remnants and supermassive BHs has only recently become unambiguously established. GW190521, a gravitatio…
Millisecond Pulsars in Dense Star Clusters: Evolution, Scaling Relations, and the Galactic-Center Gamma-ray Excess
Claire S. Ye, Giacomo Fragione
The number of millisecond pulsars (MSPs) observed in Milky Way globular clusters has increased explosively in recent years, but the underlying population is still uncertain due to…
Implication of spin constraints by the Event Horizon Telescope on stellar orbits in the Galactic Center
Giacomo Fragione, Abraham Loeb
The center of the Milky Way hosts the closest supermassive black hole, SgrA. Decades of near-infrared observations of our Galactic Center have shown the presence of a small pop…