Academic literature on the topic 'Relativitatea generală'

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Journal articles on the topic "Relativitatea generală"

1

Sfetcu, Nicolae. "Anomalii ale relativității generale." Cunoașterea Științifică 1, no. 2 (2022): 11–23. http://dx.doi.org/10.58679/cs39197.

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În timp, teoria generală a relativității a acumulat mai multe anomalii și discrepanțe, indicând necesitatea unor teorii mai bune despre gravitație sau alte moduri de abordare. Ipotezele ad-hoc introduse în relativitatea generală pentru a explica singularitățile gravitaționale pe baza condițiilor energetice nu sunt foarte eficiente. Sunt necesare ipoteze mai detaliate asupra conținutului materiei. Mulți oameni de știință și filosofi au ajuns la concluzia că singularitățile trebuie să fie asociate cu atingerea limitelor valabilității fizice a relativității generale, fiind nevoie să se dezvolte o
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Nicolae, Sfetcu. "Anomalii ale relativității generale." Cunoașterea Științifică 1, no. 2 (2022): 11–23. https://doi.org/10.58679/CS39197.

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Abstract:
În timp, teoria generală a relativității a acumulat mai multe anomalii și discrepanțe, indicând necesitatea unor teorii mai bune despre gravitație sau alte moduri de abordare. Ipotezele ad-hoc introduse în relativitatea generală pentru a explica singularitățile gravitaționale pe baza condițiilor energetice nu sunt foarte eficiente. Sunt necesare ipoteze mai detaliate asupra conținutului materiei. Mulți oameni de știință și filosofi au ajuns la concluzia că singularitățile trebuie să fie asociate cu atingerea limitelor valabilității fizice a relativității generale, fiind nevoi
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3

Sfetcu, Nicolae. "Teste gravitaționale." Cunoașterea Științifică 1, no. 1 (2022): 31–36. http://dx.doi.org/10.58679/cs75905.

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Cele mai multe experimente au confirmat relativitatea generală cu ajutorul tehnologiilor nou dezvoltate. S-a creat o bază tehnologică pentru astronomia undelor gravitaționale. S-au construit antene barogene criogenice și antene interferometrice laser performante, asociate cu analiza teoretică a experimentelor cu masele de testare, rezultând că sensibilitatea experimentelor depinde de izolarea termică, dacă dispozitivul înregistrează continuu coordonatele sensibilitatea antenei este limitată, și se poate crește sensibilitatea dacă se folosesc proceduri cuantice. Antenele pot ajuta în observarea
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4

Nicolae, Sfetcu. "Teste gravitaționale." Cunoașterea Științifică 1, no. 1 (2022): 31–36. https://doi.org/10.58679/CS75905.

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Cele mai multe experimente au confirmat relativitatea generală cu ajutorul tehnologiilor nou dezvoltate. S-a creat o bază tehnologică pentru astronomia undelor gravitaționale. S-au construit antene barogene criogenice și antene interferometrice laser performante, asociate cu analiza teoretică a experimentelor cu masele de testare, rezultând că sensibilitatea experimentelor depinde de izolarea termică, dacă dispozitivul înregistrează continuu coordonatele sensibilitatea antenei este limitată, și se poate crește sensibilitatea dacă se folosesc proceduri cuantice. Antenele pot ajuta &
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Dissertations / Theses on the topic "Relativitatea generală"

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Cañizares, Martínez Priscil·la. "Extreme-Mass-Ratio Inspirals: Modelling and Test of an Alternative Theory of Gravity." Doctoral thesis, Universitat Autònoma de Barcelona, 2011. http://hdl.handle.net/10803/83955.

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Extreme-Mass-Ratio Inspirals (EMRIs) són sistemes binaris que estan compostos per Objectes Estel.lars Compactes (OECs) orbitant al voltant de Forats Negres Massius (FNMs) situats als centres galàctics. Aquests sistemes són una de les fonts pricipals d’Ones Gravitacionals (OGs) per detectors espacials com l’antena espacial LISA (Laser Interferometer Space Antenna). Un EMRI emet senyals molt llargs i complexes dintre del fort camp gravitatori del FNM. Aquests senyals porten codificada l’estructura del FNM. Per aquest motiu, les OGs procedent d’EMRIs són una font valuosa per estudiar els FN
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Evans, Christopher. "The generation of knowledge through experimentation in fundamental physics: the case of gravity Probe B." Doctoral thesis, Universitat Autònoma de Barcelona, 2016. http://hdl.handle.net/10803/400663.

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En el presente trabajo analizo desde un punto de vista crítico el episodio que representa “Gravity Probe B” (GPB) (La Sonda de la Gravedad B) en la historia de la experimentación en la física fundamental. Anunciado como una “Prueba del Universo de Einstein”, GPB fue un experimento para examinar predicciones de la teoría general de la relatividad (TGR) que duró 50 años. GPB nació en Stanford University, en el momento que el principio de la tecnología de satélites lo convirtió en una posibilidad y se convirtió en el proyecto más longevo de la NASA: los resultados finales se publicaron en el año
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Izquierdo, Sáez Germán. "Relic gravitational waves in the expanding Universe." Doctoral thesis, Universitat Autònoma de Barcelona, 2005. http://hdl.handle.net/10803/3372.

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Las ondas gravitatorias primordiales representan una ventana privilegiada para determinar la evolución del Universo, ya que a partir de su espectro seria posible reconstruir el factor de escala desde los instantes iniciales de expansión hasta el instante presente. En esta tesis, trabajando en aproximación de vacío adiabático, hemos revisado como la expansión del Universo amplifica las fluctuaciones del vacío cuántico. Hemos evaluado el espectro en un modelo de expansión del universo que considera una era inicial inflacionaria, una era dominada por agujeros negros primordiales y radiación, una
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4

Licht, David. "Effective Dynamics of Black Hole Horizons." Doctoral thesis, Universitat de Barcelona, 2021. http://hdl.handle.net/10803/671802.

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In this thesis we present a new aspect pertaining to the effective field theory of general relativity in the limit of a large number D of dimensions. We demonstrate that the theory initially developed to capture the physics of asymptotically flat branes also contains a new family of localized solutions that can be identified with higher dimensional black holes such as the Schwarzschild-Thangerlini or the Myers-Perry black holes in the limit of a large number of spacetime dimensions. Using this technique we have explored several new aspects of these black hole solutions. We show that the effe
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Luna, Raimon. "New Strategies for Black Hole Physics." Doctoral thesis, Universitat de Barcelona, 2020. http://hdl.handle.net/10803/669583.

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In this thesis we apply new approaches and develop new techniques to address various issues related to fundamental aspects of modern gravitational theory and black holes. We study the behavior of black branes in the large D approximation, that is, we consider a space with a very large number of dimensions. This approach allows us to obtain a set of very simple equations that capture many of the physical phenomena of gravity. This technique uses the fact that the gravitational field around a massive object decays faster the higher the dimension, so when you take the very large D limit it bec
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Triana, Iglesias Miquel. "Holographic collisions and non-conformal dynamics." Doctoral thesis, Universitat de Barcelona, 2017. http://hdl.handle.net/10803/460684.

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The gauge/gravity duality has proven to be a very useful tool in the understanding of quantum field theories outside the perturbative regime. In particular, holography has been able to shed light not only on generic mechanisms of strongly coupled theories, but also on processes occurred in experimental set-ups, such as the heavy ion collisions. Experimental observations such as small viscosities or fast hydrodynamization find a natural explanation when the problem is expressed in terms of gravity and black holes. Despite the successes, however, it is important to bear in mind that holography
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Di, Dato Adriana. "Correspondences in higher-dimensional gravity." Doctoral thesis, Universitat de Barcelona, 2015. http://hdl.handle.net/10803/384541.

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In this thesis we have made progress on the study of higher dimensional gravity by focusing on the properties of black holes and branes and their dynamics. We have developed two main projects: • provide several maps between different spacetimes • determine the hydrodynamical behavior of fluids dual to some classes of black holes This work improves the current understanding of GR in spacetimes with general dimension and gives hints for holography in spacetimes different from AdS. Here we give a brief summary of the work developed underling the main results achieved. In Chapter 2, we intro
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Martínez, Montero Marina. "Studies of Black Hole Horizons." Doctoral thesis, Universitat de Barcelona, 2016. http://hdl.handle.net/10803/396271.

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This thesis has focused entirely on classical and thermodynamical aspects of black hole physics. We have developed four different projects involving different kinds of black holes. 1 BLACK BRANES IN A BOX Neutral black branes with extended horizons are dynamically unstable to long wavelength perturbations along their horizons; this instability is known as the Gregory-Laflamme instability. In some regimes, the dynamics of black branes can be captured by an effective hydrodynamic description. We have studied the effective hydrodynamics of neutral black branes inside a cylindrical cavity to i
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Escrivá, Mañas Alberto. "Numerical simulations of primordial black holes­­­­­­­­­­." Doctoral thesis, Universitat de Barcelona, 2021. http://hdl.handle.net/10803/672269.

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This thesis has been devoted to the study of the gravitational collapse of spherically symmetric perturbations on a Friedman-Robertson-Walker (FRW) universe filled by a perfect fluid. Large cosmological perturbations generated by inflation, are known to be statistically almost spherical. For this reason, this thesis aims to provide the conditions for Primordial Black Hole (PBH) formation due to the collapse of inflationary density fluctuations. PBHs are considered one of the best candidate for the missing dark matter (DM). To simulate the collapse of large spherical overdensities, it has been
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Books on the topic "Relativitatea generală"

1

Sáez, Germán Izquierdo. Relic gravitational waves in the expanding Universe. Universitat Autònoma de Barcelona, 2006.

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2

Există istorie adevărată?: Despre "relativitatea generală" a istoriei : eseu de epistemologie. Humanitas, 2009.

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3

Singularitățile ca limite ontologice ale relativității generale. MultiMedia Publishing, 2018.

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4

Teoria General de la Relativitat de la Psique Doctrina de la Psicologia: Doctrina de Psique Bipolar I Psicosi Primal. Independently Published, 2020.

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5

H, Price Richard, WILLIAM H. PRESS, Saul A. Teukolsky, and Alan P. Lightman. Problem Book in Relativity and Gravitation. Princeton University Press, 2017.

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6

H, Price Richard, WILLIAM H. PRESS, Saul A. Teukolsky, and Alan P. Lightman. Problem Book in Relativity and Gravitation. Princeton University Press, 2017.

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