Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 68 for “"Pulsars"”.
-
Detecting Pulsars with Neural Networks
Pulsars are rotating neutron stars which emit faint beams of electromagnetic radiation. Astronomers are able to observe these beams as faint, dispersed pulses. In pulsar searches large effort is expended to discover these pulses in time- and frequency-resolved data from radio telescopes. …
-
Binary pulsars: evolution and fundamental physics
In the standard theory of pulsar spin-up, a neutron star (NS) in a binary system accretes matter from its companion star; this serves to transfer angular momentum to the NS, increasing the spin frequency of the pulsar. Measurement of the orbital parameters and system geometry, and in particular the …
-
A search for fast pulsars in globular clusters
Millisecond pulsars (MSP) are old neutron stars that have been spun up to high spin frequencies(as fast as 716 Hz) through the accretion of matter from a companion star. The extreme stellar densities in the core of globular clusters creates numerous accreting neutron star systems through exchange …
-
A study of chameleon-photon mixing from pulsars
A number of solutions to the dark energy problem have been proposed in literature, the simplest is the cosmological constant A. The cosmological constant lacks theoretical explanation for its extremely small value, thus dark energy is more generally modelled as a quintessence scalar field rolling …
-
A Study of Dynamical and Emission Variabilities in Pulsars
Pulsars are rapidly rotating highly magnetized neutron stars thought to have been formed in the core-collapse supernova of massive stars. Ever since their discovery, pulsars have shown complex behaviors. This is certainly true for their emission mechanism, which is still not fully understood. This …
-
Decoding Continuous Gravitational Waves from Pulsars: A Multi-Wavelength Approach
… signals are expected, for instance, from young pulsars with non-axisymmetric configurations, particularly those within pulsar wind nebulae (PWNe). However, detecting such signals poses significant challenges, requiring advanced data analysis techniques and the integration of multi-wavelength …
-
GPU acceleration of the frequency domain acceleration search for binary pulsars
… this work presents a GPU-accelerated search for pulsars. Pulsars are highly magnetised neutron stars with extremely stable rotational periods. These periods can be accurately measured, which makes them exceptionally powerful reference tools in the field of astrophysics. Pulsars have very weak …
-
Illuminating the Properties of Radio Pulsars and Their Binary Companions through Pulsar Timing
Contains fulltext : 307141.pdf (Publisher’s version ) (Open Access)
-
Gamma-ray emission from Galactic millisecond pulsars: Implications for dark matter indirect detection
… meantime, a population of unresolved millisecond pulsars (MSPs) in the Galactic center remains a possible source of the excess. Furthermore, recent analyses have shown that the excess prefers the spatial morphology of the stellar bulge distribution in the Galactic center, supporting a MSP origin. …
-
Sampling the Radio Transient Universe: Studies of Pulsars and the Search for Extraterrestrial Intelligence
… from solar and Jovian bursts, to flare stars, pulsars, and bursts of Galactic and potentially even cosmological origin. Among these, perhaps the most widely studied radio transients, pulsars are fast-spinning neutron stars that emit radio beams from their magnetic poles. In spite of over 40 …
-
Analysis and Application of Automated Methods for Detecting Pulsars in the Green Bank Telescope 350MHz Drift-Scan Survey
A significant portion of the process of detecting pulsars from radio sky surveys remains a largely manual task. The visual inspection of data in order to detect and validate potential pulsar candidates is by far the most time consuming portion of the overall process. Coupled with the fact that well …
-
Search and characterization of pulsars in southern globular clusters: new methodologies and results from an S-band survey
This thesis explores the search for radio pulsars in globular clusters and the development of computational methods to enhance their detection under challenging observational conditions. Pulsars are rapidly rotating neutron stars---remnants of supernova explosions---and represent some of the most …
-
X-ray astronomy with CCDs : calibration of the advanced CCD imaging spectrometer and observations of rotation-powered pulsars
… the X-ray properties of rotation-powered (radio) pulsars. High energy observations serve as a powerful diagnostic of the energetics and emission mechanisms of neutron stars. Associations between pulsars and the remnants of their supernovae provide independent measures of the distance and age of …
-
Multi-wavelength study of neutron stars in the Magellanic Clouds
… Cloud (SMC), leading to the discovery of new pulsars, corresponding to a population size increase of 40%. The new radio pulsars allow for further characterisation of the SMC pulsar population. To relate these observational incarnations of neutron stars (i.e. radio pulsars and accreting X-ray …
-
A methodology for state determination without prior information using X-ray pulsar navigation systems
… highly stable, rapidly spinning stars called pulsars, enable determination of spacecraft position, velocity, and attitude states. Due to the short period of pulsar signals, X-ray pulsar based navigation (XNAV), may result in position ambiguity within the Solar System and typically requires an …
-
Data analysis of continuous gravitational waves
… search strategy to search for unknown pulsars. This project is divided into two parts; the first part (and the main part) is the semi-coherent hierarchical optimization strategy. The second part is a coherent hierarchical optimization strategy which can be used in a project like …
Page 1 of 4