000134505 001__ 134505
000134505 005__ 20190316234516.0
000134505 037__ $$aSTUDENT
000134505 245__ $$aCosmic string detection from interferometric data of the microwave background radiation
000134505 269__ $$a2009
000134505 260__ $$c2009
000134505 336__ $$aStudent Projects
000134505 520__ $$aAccording to the standard cosmological model, the Gaussian adiabatic perturbations that occurred in the early universe produced a pure Gaussian component in the cosmic microwave background (CMB). However, some models also suggest the formation of topological defects such as "cosmic strings" which would have imprinted a non-Gaussian component in the CMB superimposed to the standard Gaussian component. This overall CMB signal may be probed by radio-interferometers through incomplete and noisy Fourier measurements. The aim of the project is to develop and test algorithms for the detection of cosmic strings from such interferometric data of the CMB. In this work, we show that this problem can be address in a compressed sensing perspective. In this context, we propose and test two algorithms which take into account prior information on the string signal. The performance are then assessed by comparing the reconstructions obtained with these methods and the ones obtained with a very common algorithm in radio-astronomy called CLEAN.
000134505 6531_ $$aCosmic strings
000134505 6531_ $$acompressed sensing
000134505 6531_ $$aradio interferometry
000134505 6531_ $$aLTS2
000134505 700__ $$0242927$$aPuy, Gilles$$g179918
000134505 720_2 $$0240427$$aWiaux, Yves$$edir.$$g163268
000134505 720_2 $$0240428$$aVandergheynst, Pierre$$edir.$$g120906
000134505 8564_ $$s2126450$$uhttps://infoscience.epfl.ch/record/134505/files/report.pdf
000134505 909C0 $$0252392$$pLTS2$$xU10380
000134505 909CO $$ooai:infoscience.tind.io:134505$$pSTI$$qGLOBAL_SET
000134505 937__ $$aEPFL-STUDENT-134505
000134505 973__ $$aEPFL$$sPUBLISHED
000134505 980__ $$aSTUDENT$$bMASTERS