Rotational effects in quark stars: comparing different models Article Swipe

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Issifu, Adamu , Konstantinou, Andreas , da Silva, Franciele M. , Frederico, Tobias ·

YOU? · · 2025 · Open Access ·

We investigate the rotational properties of self-bound strange quark stars using two representative quark matter equations of state (EOS): the vector MIT bag model and the density-dependent quark mass (DDQM) model. Through general-relativistic calculations of uniformly rotating sequences, we analyze their mass--radius relations, moments of inertia, quadrupole moments, surface redshifts, Keplerian frequencies, and energy components. A central result of this work is the full decomposition of the stellar energy budget in rotating strange stars, separating gravitational, internal, rotational, and binding energy contributions. Rotation amplifies the intrinsic EOS differences: the MIT model supports more massive ($M_{\max} \gtrsim 3.3\,M_\odot$) compact stars with larger moments of inertia and greater resistance to deformation, while the DDQM model produces larger radii, less massive stars limited by mass-shedding at lower frequencies. Combined measurements of mass, radius, and frequency can thus break the EOS degeneracy; massive, rapidly rotating pulsars favors MIT-like EOS, whereas larger radii in canonical stars point to a DDQM-like model. These rotational observables, soon to be tightly constrained by NICER and next-generation gravitational-wave detectors, offer a means to test the existence and composition of self-bound quark matter in compact stars.

Related Topics

Quantum Electrodynamics

Mathematical Formulation Of The Standard Model

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Physics Quark star Moment of inertia Strange matter Stars Quadrupole Rotational energy Pulsar Strange quark Quark Neutron star Rotation (mathematics) Equation of state Top quark Particle physics Energy (signal processing) Work (physics) Astrophysics Hyperon Quark model Classical mechanics Quantum chromodynamics Mixing (physics) Point (geometry) Surface (topology) Quantum electrodynamics Point particle Down quark Standard Model (mathematical formulation)

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Landing Page: http://arxiv.org/abs/2511.20477
PDF: https://arxiv.org/pdf/2511.20477
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Title: Rotational effects in quark stars: comparing different models

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Publication year: 2025

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Publication date: 2025-11-25

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Authors: Issifu, Adamu, Konstantinou, Andreas, da Silva, Franciele M., Frederico, Tobias

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Concepts: Physics, Quark star, Moment of inertia, Strange matter, Stars, Quadrupole, Rotational energy, Pulsar, Strange quark, Quark, Neutron star, Rotation (mathematics), Equation of state, Top quark, Particle physics, Energy (signal processing), Work (physics), Astrophysics, Hyperon, Quark model, Classical mechanics, Quantum chromodynamics, Mixing (physics), Point (geometry), Surface (topology), Quantum electrodynamics, Point particle, Down quark, Standard Model (mathematical formulation)

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abstract_inverted_index.next-generation	167
abstract_inverted_index.density-dependent	26
abstract_inverted_index.gravitational-wave	168
abstract_inverted_index.general-relativistic	32
cited_by_percentile_year
countries_distinct_count	0
institutions_distinct_count	4
citation_normalized_percentile.value	0.79621867
citation_normalized_percentile.is_in_top_1_percent	False
citation_normalized_percentile.is_in_top_10_percent	False