Inferring the gravitational binding energy and moment of inertia of PSR J0030+0451 and PSR J0740+6620 from new universal relations

2021 ◽  
Author(s):  
Yuxi Li ◽  
Jue Wang ◽  
Zehan Wu ◽  
Dehua Wen
Keyword(s):  
Neutron Star ◽  
Binding Energy ◽  
Relative Error ◽  
High Accuracy ◽  
Moment Of Inertia ◽  
Gravitational Mass

Abstract The Neutron Star Interior Composition Explorer (NICER) recently simultaneously measured the gravitational mass (Mg) and radius (R) of PSR J0030+0451 and PSR J0740+6620, respectively. Inspired by the groundbreaking observations, we establish two high accuracy universal relations (with the relative error at 1% level) related to Mg and R to infer the gravitational binding energy (Eg) and moment of inertia (I) of the two pulsars. By combining these universal relations with the data of (Mg, R) released by NICER collaboration, the gravitational binding energy and moment of inertia of PSR J0030+0451 can be constrained within |Eg| = 0.21+0.03−0.03M⊙ and I = 1.95+0.70−0.50×1045g cm2at 68% credible level, respectively. The gravitational binding energy and moment of inertia of PSR J0740+6620 can be constrained within |Eg| = 0.47+0.09−0.12M⊙ and I = 4.65+1.16−0.82 × 1045g cm2at 68% credible level, respectively.

scholarly journals High-accuracy waveforms for black hole-neutron star systems with spinning black holes

2021 ◽  
Vol 103 (6) ◽  
Author(s):  
Francois Foucart ◽  
Alexander Chernoglazov ◽  
Michael Boyle ◽  
Tanja Hinderer ◽  
Max Miller ◽  
...  
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Neutron Star ◽  
High Accuracy

scholarly journals Assessment of the Accuracy of a Multi-Beam LED Scanner Sensor for Measuring Olive Canopies

Sensors ◽  
2018 ◽  
Vol 18 (12) ◽  
pp. 4406 ◽  
Author(s):  
Rafael Sola-Guirado ◽  
Sergio Bayano-Tejero ◽  
Antonio Rodríguez-Lizana ◽  
Jesús Gil-Ribes ◽  
Antonio Miranda-Fuentes
Keyword(s):  
Laboratory Test ◽  
Real Time ◽  
Relative Error ◽  
Laser Scanner ◽  
Field Tests ◽  
High Accuracy ◽  
Field Conditions ◽  
Canopy Trees ◽  
Canopy Volume

Canopy characterization has become important when trying to optimize any kind of agricultural operation in high-growing crops, such as olive. Many sensors and techniques have reported satisfactory results in these approaches and in this work a 2D laser scanner was explored for measuring canopy trees in real-time conditions. The sensor was tested in both laboratory and field conditions to check its accuracy, its cone width, and its ability to characterize olive canopies in situ. The sensor was mounted on a mast and tested in laboratory conditions to check: (i) its accuracy at different measurement distances; (ii) its measurement cone width with different reflectivity targets; and (iii) the influence of the target’s density on its accuracy. The field tests involved both isolated and hedgerow orchards, in which the measurements were taken manually and with the sensor. The canopy volume was estimated with a methodology consisting of revolving or extruding the canopy contour. The sensor showed high accuracy in the laboratory test, except for the measurements performed at 1.0 m distance, with 60 mm error (6%). Otherwise, error remained below 20 mm (1% relative error). The cone width depended on the target reflectivity. The accuracy decreased with the target density.

scholarly journals Moment of inertia of neutron star crust in alternative and modified theories of gravity

2016 ◽  
Vol 94 (2) ◽  
Author(s):  
Kalin V. Staykov ◽  
K. Yavuz Ekşi ◽  
Stoytcho S. Yazadjiev ◽  
M. Metehan Türkoğlu ◽  
A. Savaş Arapoğlu
Keyword(s):  
Neutron Star ◽  
Moment Of Inertia ◽  
Modified Theories Of Gravity ◽  
Neutron Star Crust ◽  
Theories Of Gravity

scholarly journals ENTRAINMENT FACTOR OF INDIVIDUAL GLITCH FRACTIONAL MOMENT OF INERTIA

2019 ◽  
Vol 55 (1) ◽  
pp. 3-9
Author(s):  
I. O. Eya ◽  
J. O. Urama ◽  
A. E. Chukwude
Keyword(s):  
Neutron Star ◽  
Moment Of Inertia ◽  
Fractional Moment ◽  
Effective Moment ◽  
Effective Moment Of Inertia

The superfluid in the inner crust of a neutron star is assumed to be the reservoir of momentum released in a pulsar glitch. Recently, due to crustal entrainment, it appears debatable whether the magnitude of the inner crust is sufficient to contain the superfluid responsible for large glitches. This paper calculates the fractional moment of inertia (FMI)(i.e. the ratio of the inner crust superfluid moment of inertia to that of the coupled components) associated with individual glitches. It is shown that the effective moment of inertia associated with the transferred momentum is that of the entrained neutrons. The FMI for glitches in three pulsars, which exhibit the signature of exhausting their momentum reservoir, were calculated and scaled with the entrainment factor. Some of the glitches require an inner crust superfluid with moment of inertia larger than the current suggested values of 7-10% of the stellar moment of inertia.

scholarly journals Binding energy and mechanical stability of two parallel and crossing carbon nanotubes

2015 ◽  
Vol 471 (2180) ◽  
pp. 20150229 ◽  
Author(s):  
Junhua Zhao ◽  
Yue Jia ◽  
Ning Wei ◽  
Timon Rabczuk
Keyword(s):  
Carbon Nanotubes ◽  
Binding Energy ◽  
Mechanical Stability ◽  
Critical Length ◽  
High Accuracy ◽  
Molecular Dynamics Calculations ◽  
Continuum Modelling ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
The Continuum

The binding energy between two parallel (and two crossing) single-walled (and multi-walled) carbon nanotubes (CNTs) is obtained by continuum modelling of the van der Waals interaction between them. The dependence of the binding energy on their diameters, number of walls and crossing angles is systematically analysed. The critical length for the mechanical stability and adhesion of the CNTs is determined by the function of E i I i , h and γ , where E i I i , h and γ are the CNTs bending stiffness, distance and binding energy between them, respectively. Checking against full atom molecular dynamics calculations show that the continuum solution has high accuracy. The established analytical solutions should be of great help for designing nanoelectromechanical devices.

scholarly journals Акустический расходомер

2019 ◽  
Vol 89 (9) ◽  
pp. 1434
Author(s):  
В.А. Бузановский
Keyword(s):  
Relative Error ◽  
Flow Rate ◽  
High Speed ◽  
Volume Flow Rate ◽  
High Accuracy ◽  
Volume Flow ◽  
Metrological Characteristics ◽  
Simple Design ◽  
Liquid Substance

The design and metrological characteristics of the acoustic flowmeter of a flow of a gaseous or liquid substance are considered. It is shown that the device has a simple design, is characterized by high accuracy (relative error of measuring the volume flow rate is less than 1%) and high speed (the time to determine the flow rate is not more than a few milliseconds).

scholarly journals Measuring the neutron star compactness and binding energy with supernova neutrinos

2017 ◽  
Vol 2017 (11) ◽  
pp. 036-036 ◽  
Author(s):  
Andrea Gallo Rosso ◽  
Francesco Vissani ◽  
Maria Cristina Volpe
Keyword(s):  
Neutron Star ◽  
Binding Energy ◽  
Supernova Neutrinos
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