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| DC Field | Value | Language |
|---|---|---|
| dc.contributor.author | Αντωνόπουλος, Γιώργος | el |
| dc.contributor.author | Antonopoulos, Georgios | en |
| dc.date.accessioned | 2025-11-14T08:08:32Z | - |
| dc.date.available | 2025-11-14T08:08:32Z | - |
| dc.identifier.uri | https://olympias.lib.uoi.gr/jspui/handle/123456789/39618 | - |
| dc.rights | Attribution-NonCommercial 3.0 United States | * |
| dc.rights.uri | http://creativecommons.org/licenses/by-nc/3.0/us/ | * |
| dc.subject | Horndeski Theory | en |
| dc.subject | Modified Theories of Gravity | en |
| dc.title | Αναλλοίωτες Αρχές Μεταβολών σε Τροποποιημένες Θεωρίες Βαρύτητας: Θεωρία Horndeski | el |
| dc.title | Invariant Variational Principles in Modified Theories of Gravity: Horndeski Theory | |
| dc.type | masterThesis | en |
| heal.type | masterThesis | el |
| heal.type.en | Master thesis | en |
| heal.type.el | Μεταπτυχιακή εργασία | el |
| heal.dateAvailable | 2025-11-14T08:09:32Z | - |
| heal.language | en | el |
| heal.access | free | el |
| heal.recordProvider | Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών | el |
| heal.publicationDate | 2025-09-05 | - |
| heal.abstract | Gravity was the first of the fundamental interactions to be studied, yet it remains the least understood. In the 17th century, Isaac Newton formulated his law of universal gravitation. Although Newton’s law could predict how gravity behaved, it offered no explanation for the mechanism behind the attraction of two bodies across empty space. This mystery persisted for centuries until 1915, when Albert Einstein reimagined gravity itself not as a force, but as the curvature of spacetime caused by mass and energy. Despite the successes of General Relativ- ity, numerous alternative theories have since emerged in attempts to modify Einstein’s theory. Lovelock’s theorem provided a theoretical foundation for this pursuit by constraining the possi- ble forms of such modifications. Among the simplest of these is the introduction of a scalar field, leading to the class of models known as scalar–tensor theories. Scalar-tensor theories can describe both the early inflationary phase of the universe, where a scalar field drives the inflationary expansion, and the late-time accelerated expansion, where the scalar field provides an alternative to the cosmological constant in ΛCDM. In the 1970s, Lovelock and Horndeski formulated the most general scalar–tensor theory in four dimensions. In this thesis, we study modified theories of gravity using invariant variational principles. In Chapter 2, we apply the methodology originally employed by Horndeski to a simpler model of gravity, whose Lagrangian involves the metric, its first and second derivatives, and a scalar field along with its first derivative. In Chapter 3, we examine the modern formulation of Horndeski’s theory, its re-emergence in physics, and derive the corresponding field equations. | en |
| heal.advisorName | Καντή, Παναγιώτα | el |
| heal.committeeMemberName | Λεοντάρης, Γεώργιος | el |
| heal.committeeMemberName | Περιβολαρόπουλος, Λέανδρος | el |
| heal.committeeMemberName | Καντή, Παναγιώτα | el |
| heal.academicPublisher | Πανεπιστήμιο Ιωαννίνων.Σχολή Θετικών Επιστημών. Τμήμα Φυσικής | el |
| heal.academicPublisherID | uoi | el |
| heal.numberOfPages | 149 | el |
| heal.fullTextAvailability | true | - |
| heal.fullTextAvailability | true | - |
| Appears in Collections: | Διατριβές Μεταπτυχιακής Έρευνας (Masters) - ΦΥΣ | |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| Μ.Δ.Ε Αντωνόπουλος Γεώργιος .pdf | 1.03 MB | Adobe PDF | View/Open |
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