I-Q Relation for Rapidly Rotating Neutron Stars
Abstract
We consider a universal relation between moment of inertia and quadrupole moment of arbitrarily fast rotating neutron stars. Recent studies suggest that this relation breaks down for fast rotation. We find that it is still universal among various suggested equations of state for constant values of certain dimensionless parameters characterizing the magnitude of rotation. One of these parameters includes the neutron star radius, leading to a new universal relation expressing the radius through the mass, frequency, and spin parameter. This can become a powerful tool for radius measurements.
- Publication:
-
Physical Review Letters
- Pub Date:
- May 2014
- DOI:
- 10.1103/PhysRevLett.112.201102
- arXiv:
- arXiv:1311.6509
- Bibcode:
- 2014PhRvL.112t1102C
- Keywords:
-
- 04.30.Db;
- 97.60.Jd;
- Wave generation and sources;
- Neutron stars;
- General Relativity and Quantum Cosmology;
- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- RevTeX, 6 pages, 5 figures, v2: overall improvement of presentation, extended discussion of prospects for observations, v3: published version