Interglitch braking indices of pulsars and energy dissipation in neutron stars

Alpar, MA
Braking indices reported for pulsars with large glitches are in agreement with the models developed for the glitches and interglitch braking indices observed from the Vela pulsar, implying that this dynamical behavior may be universal among pulsars. This implies a lower limit on the lag in rotation rate between the crust and the superfluid components of the neutron star, and on the energy dissipation rate of the neutron star. If the magnetic fields of isolated neutron stars do not decay, then dipole radiation torques and energy dissipation in the neutron star persist after the pulsar activity is over. The lower bound on the energy dissipation rate is extrapolated to give bounds on the thermal luminosities of old isolated neutron stars.


Pulsar braking indices, glitches and energy dissipation in neutron stars
Alpar, M. Ali; Baykal, Altan (Oxford University Press (OUP), 2006-10-11)
Almost all pulsars with anomalous positive Omega measurements (corresponding to anomalous braking indices in the range 5 <vertical bar n vertical bar < 100), including all the pulsars with observed large glitches (Delta Omega/Omega > 10(-7)) as well as post-glitch or interglitch Omega measurements, obey the scaling between Omega and glitch parameters originally noted in the Vela pulsar. Negative second derivative values can be understood in terms of glitches that were missed or remained unresolved. We discu...
Nonlinear Static Aeroelastic Behaviour of Composite Missile Fin with Interlaminar Damage
Özkaya, Özge; Kayran, Altan (2017-09-22)
Nonlinear static aeroelastic behavior of a basic composite missile fin is analyzed by means of two-way coupled FSI simulation and the effects of composite damages are presented. The configuration has been simulated by coupling the two commercial solvers ANSYS CFX for the fluid mechanical simulation with ANSYS Mechanical for the structural simulation. 3D composite fin geometry is constructed using ANSYS ACP tool. Interlaminar damage cases were investigated and the influence of the damage locations on the sta...
Nonlinear vibration isolation of inertial measurement unit
Dönmez, Ata; Ciğeroğlu, Ender; Özgen, Gökhan Osman; Department of Mechanical Engineering (2018)
In engineering systems, dynamic parameters of systems such as acceleration, velocity, etc. are measured instantaneously to provide feedback for control systems. Since measurement equipment is sensitive to vibratory environment, performance of them is directly related to how effectively vibration is isolated. Linear vibration isolation systems have limitations due to static deflections and damping characteristic. Therefore, nonlinear elements can be used to improve isolation performance.In this thesis, first...
Jet Shapes of Isolated Photon-Tagged Jets in Pb-Pb and pp Collisions at root S-NN=5.02 TeV
Sirunyan, A. M.; et. al. (2019-04-01)
The modification of jet shapes in Pb-Pb collisions, relative to those in pp collisions, is studied for jets associated with an isolated photon. The data were collected with the CMS detector at the LHC at a nucleon- nucleon center-of-mass energy of 5.02 TeV. Jet shapes are constructed from charged particles with track transverse momenta (p(T)) above 1 GeV/c in annuli around the axes of jets with p(T)(jet) > 30 GeV/c associated with an isolated photon with p(T)(gamma) > 60 GeV/c. The jet shape distributions a...
Numerical prediction of aerodynamic stability derivatives of a projectile
Yayla, Koray; Özyörük, Yusuf; Department of Aerospace Engineering (2021-9-07)
Prediction of aircraft aerodynamic stability derivatives is crucial for evaluating its flight dynamic characteristics. By using the open source SU2 software, steady and unsteady Reynolds-Averaged Navier-Stokes analyzes are performed in order to determine the aerodynamic stability derivatives of a missile like projectile from literature. The employed prediction methods that are based on forced oscillatory motion and differential method are particularly emphasized for roll damping and pitch damping derivative...
Citation Formats
M. Alpar, “Interglitch braking indices of pulsars and energy dissipation in neutron stars,” 1997, vol. 138, p. 7, Accessed: 00, 2020. [Online]. Available: