Battista, Emmanuele
(2016)
Extreme Regimes in Quantum Gravity.
[Tesi di dottorato]
[error in script]
[error in script]
Item Type: 
Tesi di dottorato

Resource language: 
English 
Title: 
Extreme Regimes in Quantum Gravity 
Creators: 
Creators  Email 

Battista, Emmanuele  ebattista@na.infn.it 

Date: 
17 March 2016 
Number of Pages: 
257 
Institution: 
Università degli Studi di Napoli Federico II 
Department: 
Fisica 
Scuola di dottorato: 
Scienze fisiche 
Dottorato: 
Fisica fondamentale ed applicata 
Ciclo di dottorato: 
28 
Coordinatore del Corso di dottorato: 
nome  email 

Velotta, Raffaele  velotta@na.infn.it 

Tutor: 
nome  email 

Esposito, Giampiero  UNSPECIFIED 

Date: 
17 March 2016 
Number of Pages: 
257 
Keywords: 
general relativity,
effective field theories of gravity,
quantum gravity,
Lagrangian points,
boost,
spacetime singularity,
gravitational waves 
Settori scientificodisciplinari del MIUR: 
Area 02  Scienze fisiche > FIS/02  Fisica teorica, modelli e metodi matematici 
Date Deposited: 
14 Apr 2016 20:44 
Last Modified: 
31 Oct 2016 09:46 
URI: 
http://www.fedoa.unina.it/id/eprint/10679 
Collection description
The thesis is divided into two parts. In the first part the lowenergy limit of quantum gravity is analysed, whereas in the second we deal with the highenergy domain.
In the first part, by applying the effective field theory point of view to the quantization of general relativity, detectable, though tiny, quantum effects in the position of Newtonian Lagrangian points of the EarthMoon system are found. In order to make more realistic the quantum corrected model proposed, the full threebody problem where the Earth and the Moon interact with a generic massive body and the restricted fourbody problem involving the perturbative effects produced by the gravitational presence of the Sun in the EarthMoon system are also studied. After that, a new quantum theory having general relativity as its classical counterpart is analysed. By exploiting this framework, an innovative interesting prediction involving the position of Lagrangian points within the context of general relativity is described. Furthermore, the new pattern provides quantum corrections to the relativistic coordinates of EarthMoon libration points of the order of few millimetres.
The second part of the thesis deals with the Riemannian curvature characterizing the boosted form assumed by the Schwarzschildde Sitter metric. The analysis of the Kretschmann invariant and the geodesic equation shows that the spacetime possesses a ``scalar curvature singularity'' within a 3sphere and that it is possible to define what we here call ``boosted horizon'', a sort of elastic wall where all particles are surprisingly pushed away, suggesting that such
``boosted geometries'' are ruled by a sort of ``antigravity effect''. Eventually, the equivalence with the coordinate shift method is invoked in order to demonstrate that all $\delta^2$ terms appearing in the Riemann curvature tensor give vanishing contribution in distributional sense.
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