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Title:Detection of gravitational waves : Diploma thesis
Authors:ID O'Loughlin, Martin (Mentor) More about this mentor... New window
ID Mrak, Gregor (Author)
Files:.pdf Gregor_Mrak.pdf (3,27 MB)
MD5: 797E3F66E0AC92F14D3D45B5436496C2
 
Language:English
Work type:Bachelor thesis/paper
Typology:2.11 - Undergraduate Thesis
Organization:FN - School of Science
Abstract:This report mainly focuses on the first two detections of gravitational waves (GW). At the beginning of the thesis the historical background of GW explorations is discussed by pointing out some arguments and researchers that were essential for the progress. Continuing with the derivation based on the theory of general relativity, in order to express where certain properties derive. In the main part of the report, the subject of interest becomes Laser interferometer gravitational-wave observatory (LIGO), beginning with the problems occurring on the way to detection, describing different noise sources one by one. After pointing out the problems, solutions are discussed, namely the technological advances made to lower the background noise as much as possible. The chapter (4) points out different parts of the detector which are implemented to produce a clearer signal. As only physical noise reduction methods are not enough, digital signal processing algorithms are mentioned as well which are used to analyze the data. Subsequently the required theoretical knowledge is given, so the main part ends with the analysis of actual data taken from LIGO’s public release for both GW150914 and GW151226 events (first and second official detections). In the conclusion of the report a brief descriptions of various detectors besides Ligo are given and some insight of the future detectors that are planned to be built.
Keywords:Gravitational waves, Ligo, Binary black hole merger, gravitational wave interferometry
Place of publishing:Nova Gorica
Year of publishing:2016
PID:20.500.12556/RUNG-2628 New window
COBISS.SI-ID:4508923 New window
NUK URN:URN:SI:UNG:REP:PEQTDNP0
Publication date in RUNG:27.09.2016
Views:7994
Downloads:324
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Secondary language

Language:Slovenian
Title:Detekcija gravitacijskih valov : Diplomska naloga
Abstract:To porocilo se osredotoca na prvi dve neposredni detekciji gravitacijskih valov (GW). Na zacetku porocila je izpostavljeno zgodovinsko ozadje raziskovanja GW, s poudarkom na dolocenih argumentih ter raziskovalcih, ki so bili bistvenega pomena za napredek. V nadaljevanju porocila se tematika osredotoca na izpeljavo gravitacijskih valov preko splošne teorije relativnosti, s poudarkom na izvoru dolocenih lastnosti. Osrednji del porocila obravnava observatorij LIGO (laser interferometer gravitational-wave observatory) in probleme, s katerimi so se srecevali na poti do prve uspešne meritve, še posebej razlicne vire hrupa. Po obravnavi izpostavljenih težav se razprava nadaljuje z rešitvami na le-teh. Tehnološki napredek omogoca, da je hrup iz ozadja zmanjšan kolikor je mogoce. Poglavje (4) izpostavlja razlicne dele detektorja, še posebej tiste, ki so namenjeni temu, da bi bil signal jasen kolikor se da. Ker metode fizicnega zmanjševanja hrupa niso dovolj, je podana obrazložitev algoritmov za obdelavo digitalnih signalov, ki se uporabljajo za analizo podatkov. Na tej tocki je potrebno teoreticno znanje dano, tako da se jedro zakljuci z analizo podatkov vzetih iz javne objave LIGO-ta za GW150914 in GW151226 dogodka (prva in druga uradna detekcija). V zakljucku porocila so podani kratki opisi razlicnih detektorjev ter zaris bodocih detektorjev, ki so nacrtovani v prihodnosti.
Keywords:Gravitacijski valovi, Ligo, Združitev binarnega sistema crnih lukenj, interferometrija gravitacijskih valov


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