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A recent solution of the hyperon puzzle by a first order phase transition to color superconducting quark matter is revisited in order to replace the Maxwell construction by an interpolation method which describes a mixed phase. To do this,…

Nuclear Theory · Physics 2020-10-16 M. Shahrbaf , D. Blaschke , S. Khanmohamadi

First-order phase transitions, like the liquid-gas transition, proceed via formation of structures such as bubbles and droplets. In strongly interacting compact star matter, at the crust-core transition, but also at the hadron-quark…

High Energy Astrophysical Phenomena · Physics 2018-09-17 Vahagn Abgaryan , David Alvarez-Castillo , Alexander Ayriyan , David Blaschke , Hovik Grigorian

A simple mixed phase model mimicking so-called "pasta" phases in the quark-hadron phase transition is developed and applied to static neutron stars for the case of DD2 type hadonic and NJL type quark matter models. The influence of the…

High Energy Astrophysical Phenomena · Physics 2018-03-15 Alexander Ayriyan , Hovik Grigorian

The effect of pasta phases on the quark-hadron phase transition is investigated for a set of relativistic mean-field equations of state for both hadron and quark matter. The results of the full numerical solution with pasta phases are…

Recently it has been found that a certain class of hybrid star equations of state with a large latent heat (strong first order phase transition obtained by a Maxwell construction) between stiff hadronic hadronic and stiff quark matter…

High Energy Astrophysical Phenomena · Physics 2017-10-10 D. E. Alvarez-Castillo , D. Blaschke

We discuss the properties of the hadron-quark mixed phase in compact stars using a realistic equation of state of hyperonic matter and the MIT bag model. We find that the equation of state of the mixed phase is similar to that given by the…

Nuclear Theory · Physics 2008-11-26 Toshiki Maruyama , Satoshi Chiba , Hans-Josef Schulze , Toshitaka Tatsumi

Quest for a new form of matter inside compact stars compels us to examine the thermodynamical properties of the phase transitions. We closely consider the first-order phase transitions and the phase equilibrium on the basis of the Gibbs…

Nuclear Theory · Physics 2011-07-13 Toshitaka Tatsumi , Nobutoshi Yasutake , Toshiki Maruyama

By taking the nucleon-to-quark phase transition within a neutron star as an example, we present a thermodynamically consistent method to calculate the equation of state of ambient matter so that transitions that are intermediate to those of…

Nuclear Theory · Physics 2023-04-26 Constantinos Constantinou , Tianqi Zhao , Sophia Han , Madappa Prakash

We investigate the properties of the hadron-quark mixed phase in compact stars using a Brueckner-Hartree-Fock framework for hadronic matter and the MIT bag model for quark matter. We find that the equation of state of the mixed phase is…

Nuclear Theory · Physics 2009-11-13 Toshiki Maruyama , Satoshi Chiba , Hans-Josef Schulze , Toshitaka Tatsumi

We investigate the robustness of third family solutions for hybrid compact stars with a quark matter core that correspond to the occurrence of high-mass twin stars against a softening of the phase transition by means of a construction that…

Nuclear Theory · Physics 2018-05-03 A. Ayriyan , N. -U. Bastian , D. Blaschke , H. Grigorian , K. Maslov , D. N. Voskresensky

Background: At high density deconfinement of hadronic matter may occur leading to quark matter. The immense densities reached in the inner core of massive neutron stars may be sufficient to facilitate the transition. Purpose: To investigate…

Nuclear Theory · Physics 2016-04-06 D. L. Whittenbury , H. H. Matevosyan , A. W. Thomas

The structured hadron-quark mixed phase, known as the pasta phase, is expected to appear in the core of massive neutron stars. Motivated by the recent advances in astrophysical observations, we explore the possibility of the appearance of…

Nuclear Theory · Physics 2022-01-05 Min Ju , Jinniu Hu , Hong Shen

We review our recent works about ``pasta'' structures following the first-order phase transition in dense matter, which correspond to the structured mixed phases with geometrical symmetries. Three kinds of phase transitions at different…

Nuclear Theory · Physics 2009-09-29 Toshiki Maruyama , Toshitaka Tatsumi , Tomoki Endo , Satoshi Chiba

We explore the possibility of a structured hadron-quark mixed phase forming in the interior of neutron stars. The quark-meson coupling (QMC) model, which explicitly incorporates the internal quark structure of the nucleon, is employed to…

Nuclear Theory · Physics 2021-03-03 Min Ju , Xuhao Wu , Fan Ji , Jinniu Hu , Hong Shen

We investigate the properties of the hadron-quark mixed phase in compact stars using a Brueckner-Hartree-Fock framework for hadronic matter and the MIT bag model for quark matter. We find that the equation of state of the mixed phase is…

Nuclear Theory · Physics 2017-08-23 Toshiki Maruyama , Satoshi Chiba , Hans-Josef Schulze , Toshitaka Tatsumi

We investigate systematically the possible deconfinement phase transition from nuclear matter to quark matter in compact stars. The properties of nuclear matter are fixed by expanding its binding energy to the order of $\rho^3$, while those…

High Energy Physics - Phenomenology · Physics 2022-05-24 Hao-Miao Jin , Cheng-Jun Xia , Ting-Ting Sun , Guang-Xiong Peng

We study the quark-hadron mixed phase in proto-neutron stars with the finite-size effects. In the calculations of pasta structures appeared in the mixed phase, the Gibbs conditions require the pressure balance and chemical equilibrium…

High Energy Astrophysical Phenomena · Physics 2015-05-20 Nobutoshi Yasutake , Toshiki Maruyama , Toshitaka Tatsumi

We investigate systematically the quark-hadron mixed phase in dense stellar matter, and its influence on compact star structures. The properties of quark matter and hadronic matter are fixed based on various model predictions. Beside…

High Energy Physics - Phenomenology · Physics 2020-07-29 Cheng-Jun Xia , Toshiki Maruyama , Nobutoshi Yasutake , Toshitaka Tatsumi , Hong Shen , Hajime Togashi

Interiors of neutron stars are ultra-dense and may contain a core of deconfined quark matter. Such a core connects to the outer layers smoothly or through a sharp microscopic interface or through an intermediate macroscopic layer of…

High Energy Physics - Phenomenology · Physics 2020-04-15 Andreas Schmitt

We investigate the properties of the hadron-quark mixed phase, often termed the \textit{pasta} phase, expected to exist in the cores of massive neutron stars. To construct the equations of state (EoS), we combine an analytical…

Nuclear Theory · Physics 2024-03-22 Mauro Mariani , Germán Lugones
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