403 citations · 2k across the 25 of their papers we have counts for
25 papers
Framework for phase transitions between the Maxwell and Gibbs constructions at finite temperature
Constantinos Constantinou, Mirco Guerrini, Tianqi Zhao +2
The characteristics of the hadron-to-quark first-order phase transition differ depending on whether charge neutrality is locally or globally fulfilled. In -equilibrated matter,…
Phase Transition Phenomenology with Nonparametric Representations of the Neutron Star Equation of State
Reed Essick, Isaac Legred, Katerina Chatziioannou +2
Astrophysical observations of neutron stars probe the structure of dense nuclear matter and have the potential to reveal phase transitions at high densities. Most recent analyses a…
Large and massive neutron stars: Implications for the sound speed in dense QCD
Christian Drischler, Sophia Han, Sanjay Reddy
The NASA telescope NICER has recently measured x-ray emissions from the heaviest of the precisely known two-solar mass neutron stars, PSR J0740+6620. Analysis of the data [Miller e…
-modes of neutron stars with hadron-to-quark crossover transitions
Constantinos Constantinou, Sophia Han, Prashanth Jaikumar +1
We perform the first study of the principal core -mode oscillation in hybrid stars containing quark matter, utilizing a crossover model for the hadron-to-quark transition inspir…
Impact of the PSR J0740+6620 radius constraint on the properties of high-density matter
Isaac Legred, Katerina Chatziioannou, Reed Essick +2
X-ray pulse profile modeling of PSR J0740+6620, the most massive known pulsar, with data from the NICER and XMM-Newton observatories recently led to a measurement of its radius. We…
Constraints on the maximum mass of neutron stars with a quark core from GW170817 and NICER PSR J0030+0451 data
Ang Li, Zhiqiang Miao, Sophia Han +1
We perform a Bayesian analysis of the maximum mass of neutron stars with a quark core, incorporating the observational data from tidal deformability of the GW170817 b…
Limiting masses and radii of neutron stars and their implications
Christian Drischler, Sophia Han, James M. Lattimer +3
We combine equation of state of dense matter up to twice nuclear saturation density () obtained using chiral effective field theory (EFT), and…
Combining Electromagnetic and Gravitational-Wave Constraints on Neutron-Star Masses and Radii
Mohammad Al-Mamun, Andrew W. Steiner, Joonas Nättilä +6
We perform a joint Bayesian inference of neutron-star mass and radius constraints based on GW170817, observations of quiescent low-mass X-ray binaries (QLMXBs), photospheric radius…
On the minimum radius of very massive neutron stars
Sophia Han, Madappa Prakash
Prospects of establishing the radii of massive neutron stars in PSR J1614-2230 and PSR J0740+6620 from NICER and Chandra observatories hold the potential to constrain the equation…
Constraining hadron-quark phase transition parameters within the quark-mean-field model using multimessenger observations of neutron stars
Zhiqiang Miao, Ang Li, Zhenyu Zhu +1
We extend the quark mean-field (QMF) model for nuclear matter and study the possible presence of quark matter inside the cores of neutron stars. A sharp first-order hadron-quark ph…
Studying strong phase transitions in neutron stars with gravitational waves
Katerina Chatziioannou, Sophia Han
The composition of neutron stars at the extreme densities reached in their cores is currently unknown. Besides nuclear matter of normal neutrons and protons, the cores of neutron s…
Treating quarks within neutron stars
Sophia Han, M. A. A. Mamun, S. Lalit +2
Neutron star interiors provide the opportunity to probe properties of cold dense matter in the QCD phase diagram. Utilizing models of dense matter in accord with nuclear systematic…
Observability of sharp phase transitions in neutron stars
Sophia Han
With central densities as high as 5-10 times the nuclear saturation density, neutron stars exhibit extreme conditions that cannot be observed elsewhere. They are ideal astrophysica…
Signatures for quark matter from multi-messenger observations
Mark G. Alford, Sophia Han, Kai Schwenzer
We review the prospects for detecting quark matter in neutron star cores. We survey the proposed signatures and emphasize the importance of data from neutron star mergers, which pr…
Simultaneous Fitting of Neutron Star Structure and Cooling Data
Spencer Beloin, Sophia Han, Andrew W. Steiner +1
Using a model for the equation of state and composition of dense matter and the magnitude of singlet proton superconductivity and triplet neutron superfluidity, we perform the firs…
Tidal deformability with sharp phase transitions in (binary) neutron stars
Sophia Han, Andrew W. Steiner
The neutron star tidal deformability is a critical parameter which determines the pre-merger gravitational-wave signal in a neutron star merger. In this article, we show how neutro…
Cooling of neutron stars in soft X-ray transients
Sophia Han, Andrew W. Steiner
Thermal states of neutron stars in soft X-ray transients (SXRTs) are thought to be determined by "deep crustal heating" in the accreted matter that drives the quiescent luminosity…
Constraining Superfluidity in Dense Matter from the Cooling of Isolated Neutron Stars
Spencer Beloin, Sophia Han, Andrew W. Steiner +1
We present a quantitative analysis of superfluidity and superconductivity in dense matter from observations of isolated neutron stars in the context of the minimal cooling model. O…
Neutron star mass limit at supports the existence of a CEP
D. Alvarez-Castillo, S. Benic, D. Blaschke +2
We point out that the very existence of a "horizontal branch" in the mass-radius characteristics for neutron stars indicates a strong first-order phase transition and thus supports…
The Constant-Sound-Speed parameterization for NJL models of quark matter in hybrid stars
Ignacio F. Ranea-Sandoval, Sophia Han, Milva G. Orsaria +3
The discovery of pulsars as heavy as 2 solar masses has led astrophysicists to rethink the core compositions of neutron stars, ruling out many models for the nuclear equations of s…
Characteristics of hybrid compact stars with a sharp hadron-quark interface
Mark G. Alford, Sophia Han
We describe two aspects of the physics of hybrid stars that have a sharp interface between a core of quark matter and a mantle of nuclear matter. Firstly, we analyze the mass-radiu…
Constraining and applying a generic high-density equation of state
Mark G. Alford, G. F. Burgio, Sophia Han +2
We discuss the "constant speed of sound" (CSS) parametrization of the equation of state of high-density matter and its application to the field correlator method (FCM) model of qua…
Phase conversion dissipation in multicomponent compact stars
Mark G. Alford, Sophia Han, Kai Schwenzer
We propose a mechanism for the damping of density oscillations in multicomponent compact stars. The mechanism is the periodic conversion between different phases, i.e., the movemen…
Generic conditions for stable hybrid stars
Mark G. Alford, Sophia Han, Madappa Prakash
We study the mass-radius curve of hybrid stars, assuming a single first-order phase transition between nuclear and quark matter, with a sharp interface between the quark matter cor…