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Academic literature on the topic 'Foundations of gravity theories'

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Published: 14 March 2023

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Journal articles on the topic "Foundations of gravity theories"

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Lasenby, A. N., and M. P. Hobson. "Scale-invariant gauge theories of gravity: Theoretical foundations." Journal of Mathematical Physics 57, no. 9 (September 2016): 092505. http://dx.doi.org/10.1063/1.4963143.

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Calcagni, Gianluca. "Multifractional theories: An updated review." Modern Physics Letters A 36, no. 14 (April 22, 2021): 2140006. http://dx.doi.org/10.1142/s021773232140006x.

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The status of multifractional theories is reviewed using comparative tables. Theoretical foundations, classical matter and gravity dynamics, cosmology and experimental constraints are summarized and the application of the multifractional paradigm to quantum gravity is discussed. We also clarify the issue of unitarity in theories with integer-order derivatives.
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Golovnev, Alexey, and María-José Guzmán. "Foundational issues in f(T) gravity theory." International Journal of Geometric Methods in Modern Physics 18, supp01 (April 8, 2021): 2140007. http://dx.doi.org/10.1142/s0219887821400077.

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We give a short review on the status of research on the theoretical foundations of [Formula: see text] gravity theories. We discuss recent results on perturbative and non-perturbative approaches, causality and degrees of freedom, and discuss future directions to follow.
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Satheeshkumar, V. H., and P. K. Suresh. "Gravity and Large Extra Dimensions." Advances in Astronomy 2011 (2011): 1–12. http://dx.doi.org/10.1155/2011/189379.

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The idea that quantum gravity can be realized at the TeV scale is extremely attractive to theorists and experimentalists alike. This proposal leads to extra spacial dimensions large compared to the Planck scale. Here, we give a very systematic view of the foundations of the theories with large extra dimensions and their physical consequences.
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CAPOZZIELLO, S., M. DE LAURENTIS, L. FATIBENE, and M. FRANCAVIGLIA. "THE PHYSICAL FOUNDATIONS FOR THE GEOMETRIC STRUCTURE OF RELATIVISTIC THEORIES OF GRAVITATION: FROM GENERAL RELATIVITY TO EXTENDED THEORIES OF GRAVITY THROUGH EHLERS–PIRANI–SCHILD APPROACH." International Journal of Geometric Methods in Modern Physics 09, no. 08 (October 29, 2012): 1250072. http://dx.doi.org/10.1142/s0219887812500727.

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We discuss in a critical way the physical foundations of geometric structure of relativistic theories of gravity by the so-called Ehlers–Pirani–Schild formalism. This approach provides a natural interpretation of the observables showing how relate them to General Relativity and to a large class of Extended Theories of Gravity. In particular we show that, in such a formalism, geodesic and causal structures of space-time can be safely disentangled allowing a correct analysis in view of observations and experiment. As specific case, we take into account the case of f(R)-gravity.
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NI, WEI-TOU, HSIEN-HAO MEI, and SHAN-JYUN WU. "FOUNDATIONS OF CLASSICAL ELECTRODYNAMICS, EQUIVALENCE PRINCIPLE AND COSMIC INTERACTIONS: A SHORT EXPOSITION AND AN UPDATE." Modern Physics Letters A 28, no. 03 (January 23, 2013): 1340013. http://dx.doi.org/10.1142/s0217732313400130.

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We look at the foundations of electromagnetism in this 1st LeCosPA Symposium. For doing this, after some review (constraints on photon mass etc.), we use two approaches. The first one is to formulate a Parametrized Post-Maxwellian (PPM) framework to include QED corrections and a pseudoscalar photon interaction. PPM framework includes lowest corrections to unified electromagnetism-gravity theories based on connection approach. It may also overlap with corrections implemented from generalized uncertainty principle (GUP) when electromagnetism-gravity coupling is considered. We discuss various vacuum birefringence experiments — ongoing and proposed — to measure these parameters. The second approach — the χ-g framework is to look at electromagnetism in gravity and various experiments and observations to determine its empirical foundation. The SME (Standard Model Extension) and SMS (Standard Model Supplement) overlap with the χ-g framework in their photon sector. We found that the foundation is solid with the only exception of a potentially possible pseudoscalar-photon interaction. We discussed its experimental constraints and look forward to more future experiments.
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VACARU, SERGIU I. "PRINCIPLES OF EINSTEIN–FINSLER GRAVITY AND PERSPECTIVES IN MODERN COSMOLOGY." International Journal of Modern Physics D 21, no. 09 (September 2012): 1250072. http://dx.doi.org/10.1142/s0218271812500721.

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We study the geometric and physical foundations of Finsler gravity theories with metric compatible connections defined on tangent bundles, or (pseudo) Riemannian manifolds, endowed with nonholonomic frame structure. Several generalizations and alternatives to Einstein gravity are considered, including modifications with broken local Lorentz invariance. It is also shown how such theories (and general relativity) can be equivalently re-formulated in Finsler like variables. We focus on prospects in modern cosmology and Finsler acceleration of Universe. Einstein–Finsler gravity theories are elaborated following almost the same principles as in the general relativity theory but extended to Finsler metrics and connections. Finally, some examples of generic off-diagonal metrics and generalized connections, defining anisotropic cosmological Einstein–Finsler spaces are analyzed; certain criteria for the Finsler accelerating evolution are formulated.
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Karam, Sabah E. "Does quantum entanglement turn Rowlands’ ‘principle of duality’ into a ‘law’?" Journal of Physics: Conference Series 2197, no. 1 (March 1, 2022): 012017. http://dx.doi.org/10.1088/1742-6596/2197/1/012017.

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Abstract Physical laws are permanently observed. They are universal but not proven. Newton’s universal law of gravitation and three laws of motion, derived from the observations and theories of Copernicus, Kepler, Galileo and others, were used to take astronauts to the moon and return them safely to earth. Theories about the origin of gravity and whether gravitational forces are fundamental, quantum, entropic, induced, emergent, curved spacetime or fields like electromagnetism are still being probed. General relativity is a geometric theory, not a law, about gravity. In a book called Zero to Infinity: The Foundations of Physics Peter Rowlands asserts that physics is “founded entirely on the principle of duality.” Wave-particle duality is one of the most fundamental representations of quantum objects. Photons, electrons, neutrinos and even molecules have been shown to be in superposition and entangled. This paper will examine the role that quantum entanglement plays in the fermion/boson relationship of Rowlands’ nilpotent Dirac equation. Many other entangled physical dualities, identified as being foundational to physics, strongly suggest that his ‘principle of duality’ should be promoted into a physical law.
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Napolitano, Fabrizio, Andrea Addazi, Angelo Bassi, Massimiliano Bazzi, Mario Bragadireanu, Michael Cargnelli, Alberto Clozza, et al. "Underground Tests of Quantum Mechanics by the VIP Collaboration at Gran Sasso." Symmetry 15, no. 2 (February 11, 2023): 480. http://dx.doi.org/10.3390/sym15020480.

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Modern physics lays its foundations on the pillars of Quantum Mechanics (QM), which has been proven successful to describe the microscopic world of atoms and particles, leading to the construction of the Standard Model. Despite the big success, the old open questions at its very heart, such as the measurement problem and the wave function collapse, are still open. Various theories consider scenarios which could encompass a departure from the predictions of the standard QM, such as extra-dimensions or deformations of the Lorentz/Poincaré symmetries. At the Italian National Gran Sasso underground Laboratory LNGS, we search for evidence of new physics proceeding from models beyond standard QM, using radiation detectors. Collapse models addressing the foundations of QM, such as the gravity-related Diósi–Penrose (DP) and Continuous Spontaneous Localization (CSL) models, predict the emission of spontaneous radiation, which allows experimental tests. Using a high-purity Germanium detector, we could exclude the natural parameterless version of the DP model and put strict bounds on the CSL one. In addition, forbidden atomic transitions could prove a possible violation of the Pauli Exclusion Principle (PEP) in open and closed systems. The VIP-2 experiment is currently in operation, aiming at detecting PEP-violating signals in Copper with electrons; the VIP-3 experiment upgrade is foreseen to become operative in the next few years. We discuss the VIP-Lead experiment on closed systems, and the strong bounds it sets on classes of non-commutative quantum gravity theories, such as the θ–Poincaré theory.
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Galetska, Tetiana, Natalia Topishko, and Sergii Galetskyi. "GRAVITY MODEL OF INTERNATIONAL TRADE: ORIGIN AND MODERN APPROACHES." Scientific Notes of Ostroh Academy National University, "Economics" Series 1, no. 27(55) (December 22, 2022): 96–103. http://dx.doi.org/10.25264/2311-5149-2022-27(55)-96-103.

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The article examines the historical origins of the formation of gravity modeling and its use in the study of the intensity of international trade. It is emphasized that the driving forces of international exchange and the search for optimal policy ways of its implementation are based on classical theories of international trade. They are based on a liberal approach to deny the need for state restrictions on the free flow of goods between countries in order to regulate the volume, structure and directions of the country's foreign trade. The contribution of outstanding economists to the development of the theoretical and methodological foundations of the construction of gravity models of international exchange is considered. The features of their application for empirical research in the field of international trade are characterized. Factors affecting international trade flows are identified. An analysis of theoretical and methodological approaches to the formation of an effective gravity model of foreign trade was carried out based on the search for factors that influence it and contribute to the intensification of international trade flows between partner countries. The specificity of the involvement of new additional variables in gravity models is shown. It is emphasized that the bifurcation processes taking place in the modern globalized world form new conditions of international exchange. Attention is focused on the fact that such a situation necessitates the further development of theoretical and methodological bases for forecasting the volume of international trade based on the identification of cause-and-effect dependencies and spatio-temporal relationships. The conducted review of the history of gravity modeling, its use in studies of the international trade intensity, the contribution of prominent economists to the deepening of the theoretical and methodological foundations of the of international exchange gravity models construction showed quite wide opportunities for their further improvement based on taking into account the factors that influence the volume of bilateral trade. It was investigated that the problems are: 1) Selection of variables of the gravity model from the side of export and import for its adaptation to modern conditions of the world trade. The bifurcation processes taking place in the modern globalized world form new conditions of international exchange. 2) Gravitational models are empirical models built on liberal and neoliberal theories of international economic relations. In the conditions of globalization, a high level of interaction and interdependence of countries, the intensification of international trade flows, the movement of resources from a weaker trading partner to rich and powerful states means the flow of resources from underdeveloped and poor countries to stronger and richer ones. Gravitational models of international trade are a reflection and improvement of this process.
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Dissertations / Theses on the topic "Foundations of gravity theories"

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Di, Casola Eolo. "Sieving the Landscape of Gravity Theories. From the Equivalence Principles to the Near-Planck Regime." Doctoral thesis, SISSA, 2014. http://hdl.handle.net/20.500.11767/3911.

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This thesis focusses on three main aspects of the foundations of any theory of gravity where the gravitational field admits a geometric interpretation: (a) the principles of equivalence; (b) their role as selection rules in the landscape of extended theories of gravity; and (c) the possible modifications of the spacetime structure at a "mesoscopic" scale, due to underlying, microscopic-level, quantum-gravitational effects. The first result of the work is the introduction of a formal definition of the Gravitational Weak Equivalence Principle, which expresses the universality of free fall of test objects with non-negligible self-gravity, in a matter-free environment. This principle extends the Galilean universality of free-fall world-lines for test bodies with negligible self-gravity (Weak Equivalence Principle). Second, we use the Gravitational Weak Equivalence Principle to build a sieve for some classes of extended theories of gravity, to rule out all models yielding non-universal free-fall motion for self-gravitating test bodies. When applied to metric theories of gravity in four spacetime dimensions, the method singles out General Relativity (both with and without the cosmological constant term), whereas in higher-dimensional scenarios the whole class of Lanczos--Lovelock gravity theories also passes the test. Finally, we focus on the traditional, manifold-based model of spacetime, and on how it could be modified, at a "mesoscopic" (experimentally attainable) level, by the presence of an underlying, sub-Planckian quantum regime. The possible modifications are examined in terms of their consequences on the hypotheses at the basis of von Ignatowski's derivation of the Lorentz transformations. It results that either such modifications affect sectors already tightly constrained (e.g. violations of the principle of relativity and/or of spatial isotropy), or they demand a radical breakdown of the operative interpretation of the coordinates as readings of clocks and rods.
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Matas, Andrew. "Foundations of Massive Gravity." Case Western Reserve University School of Graduate Studies / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=case1464275510.

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Sbisa, Fulvio. "Modified theories of gravity." Thesis, University of Portsmouth, 2013. https://researchportal.port.ac.uk/portal/en/theses/modified-theories-of-gravity(3b9310e3-5d97-4e48-aa05-0444d1e89363).html.

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The recent observational data in cosmology seem to indicate that the universe is currently expanding in an accelerated way. This unexpected conclusion can be explained assuming the presence of a non-vanishing yet extremely fine tuned cosmological constant, or invoking the existence of an exotic source of energy, dark energy, which is not observed in laboratory experiments yet seems to dominate the energy budget of the Universe. On the other hand, it may be that these observations are just signalling the fact that Einstein's General Relativity is not the correct description of gravity when we consider distances of the order of the present horizon of the universe. In order to study if the latter explanation is correct, we have to formulate new theories of the gravitational interaction, and see if they admit cosmological solutions which fit the observational data in a satisfactory way. Quite generally, modifying General Relativity introduces new degrees of freedom, which are responsible for the different large distance behaviour. On one hand, often these new degrees of freedom have negative kinetic energy, which implies that the theory is plagued by ghost instabilities. On the other hand, for a modified gravity theory to be phenomenologically viable it is necessary that the extra degrees of freedom are efficiently screened on terrestrial and astrophysical scales. One of the known mechanisms which can screen the extra degrees of freedom is the Vainshtein mechanism, which involves derivative self-interaction terms for these degrees of freedom. In this thesis, we consider two different models, the Cascading DGP and the dRGT massive gravity, which are candidates for viable models to modify gravity at very large distances. Regarding the Cascading DGP model, we consider the minimal (6D) set-up and we perform a perturbative analysis at first order of the behaviour of the gravitational field and of the branes position around background solutions where pure tension is localized on the 4D brane. We consider a specific realization of this set-up where the 5D brane can be considered thin with respect to the 4D one. We show that the thin limit of the 4D brane inside the (already thin) 5D brane is well defined, at least for the configurations that we consider, and confirm that the gravitational field on the 4D brane is finite for a general choice of the energymomentum tensor. We also confirm that there exists a critical tension which separates background configurations which possess a ghost among the perturbation modes, and background configurations which are ghost-free. We find a value for the critical tension which is different from the value which has been obtained in the literature; we comment on the difference between these two results, and perform a numeric calculation in a particular case where the exact solution is known to support the validity of our analysis. Regarding the dRGT massive gravity, we consider the static and spherically symmetric solutions of these theories, and we investigate the effectiveness of the Vainshtein screening mechanism. We focus on the branch of solutions in which the Vainshtein mechanism can occur, and we truncate the analysis to scales below the gravitational Compton wavelength, and consider the weak field limit for the gravitational potentials, while keeping all non-linearities of the mode which is involved in the screening. We determine analytically the number and properties of local solutions which exist asymptotically on large scales, and of local (inner) solutions which exist on small scales. Moreover, we analyze in detail in which cases the solutions match in an intermediate region. We show that asymptotically flat solutions connect only to inner configurations displaying the Vainshtein mechanism, while non asymptotically flat solutions can connect both with inner solutions which display the Vainshtein mechanism, or with solutions which display a self-shielding behaviour of the gravitational field. We show furthermore that there are some regions in the parameter space of the theory where global solutions do not exist, and characterize precisely in which regions the Vainshtein mechanism takes place.
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Clifton, Timothy. "Alternative theories of gravity." Thesis, University of Cambridge, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.612712.

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Sbisa', F. "MODIFIED THEORIES OF GRAVITY." Doctoral thesis, Università degli Studi di Milano, 2013. http://hdl.handle.net/2434/214951.

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The recent observational data in cosmology seem to indicate that the universe is currently expanding in an accelerated way. This unexpected conclusion can be explained assuming the presence of a non-vanishing yet extremely fine tuned cosmological constant, or invoking the existence of an exotic source of energy, dark energy, which is not observed in laboratory experiments yet seems to dominate the energy budget of the Universe. On the other hand, it may be that these observations are just signalling the fact that Einstein's General Relativity is not the correct description of gravity when we consider distances of the order of the present horizon of the universe. In order to study if the latter explanation is correct, we have to formulate new theories of the gravitational interaction, and see if they admit cosmological solutions which fit the observational data in a satisfactory way. A necessary condition for the viability of a theory of ``modified gravity'' is that it has to reproduce to high precision the results of General Relativity in experimental setups where the latter is well tested. Quite in general, modifying General Relativity introduces new degrees of freedom, which are responsible for the different large distance behavior. For a modified gravity theory to be phenomenologically viable, it is necessary that the extra degrees of freedom are efficiently screened on terrestrial and astrophysical scales. One of the known mechanisms which can screen the extra degrees of freedom is known as the Vainshtein mechanism, which involves derivative self-interaction terms for these degrees of freedom. In this thesis, we consider a class of nonlinear massive gravity theories known as dGRT Massive Gravity. These theories are candidates as viable models to modify gravity at very large distances, and, apart from the mass, they contain two free parameters. We investigate the effectiveness of the Vainshtein screening mechanism in this class of theories. There are two branches of static and spherically symmetric solutions, and we consider only the branch in which the Vainshtein mechanism can occur. We truncate the analysis to scales below the gravitational Compton wavelength, and consider the weak f\mbox{}ield limit for the gravitational potentials, while keeping all non-linearities of the mode which is involved in the screening. We determine analytically the number and properties of local solutions which exist asymptotically on large scales, and of local (inner) solutions which exist on small scales. We analyze in detail in which cases the solutions match in an intermediate region. Asymptotically flat solutions connect only to inner configurations displaying the Vainshtein mechanism, while non asymptotically flat solutions can connect both with inner solutions which display the Vainshtein mechanism, or with solutions which display a self-shielding behaviour of the gravitational field. We show furthermore that there are some regions in the parameter space where global solutions do not exist, and characterise precisely in which regions of the phase space the Vainshtein mechanism takes place.
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Ranchin, Andre. "Alternative theories in quantum foundations." Thesis, Imperial College London, 2016. http://hdl.handle.net/10044/1/52462.

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Abstraction is an important driving force in theoretical physics. New insights often accompany the creation of physical frameworks which are both comprehensive and parsimonious. In particular, the analysis of alternative sets of theories which exhibit similar structural features as quantum theory has yielded important new results and physical understanding. An important task is to undertake a thorough analysis and classification of quantum-like theories. In this thesis, we take a step in this direction, moving towards a synthetic description of alternative theories in quantum foundations. After a brief philosophical introduction, we give a presentation of the mathematical concepts underpinning the foundations of physics, followed by an introduction to the foundations of quantum mechanics. The core of the thesis consists of three results chapters based on the articles in the author’s publications page. Chapter 4 analyses the logic of stabilizer quantum mechanics and provides a complete set of circuit equations for this sub-theory of quantum mechanics. Chapter 5 describes how quantum-like theories can be classified in a periodic table of theories. A pictorial calculus for alternative physical theories, called the ZX calculus for qudits, is then introduced and used as a tool to depict particular examples of quantum-like theories, including qudit stabilizer quantum mechanics and the SpekkensSchreiber toy theory. Chapter 6 presents an alternative set of quantum-like theories, called quantum collapse models. A novel quantum collapse model, where the rate of collapse depends on the Quantum Integrated Information of a physical system, is introduced and discussed in some detail. We then conclude with a brief summary of the main results.
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Gullu, Ibrahim. "Massive Higher Derivative Gravity Theories." Phd thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613975/index.pdf.

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In this thesis massive higher derivative gravity theories are analyzed in some detail. One-particle scattering amplitude between two covariantly conserved sources mediated by a graviton exchange is found at tree-level in D dimensional (Anti)-de Sitter and flat spacetimes for the most general quadratic curvature theory augmented with the Pauli-Fierz mass term. From the amplitude expression, the Newtonian potential energies are calculated for various cases. Also, from this amplitude and the propagator structure, a three dimensional unitary theory is identified. In the second part of the thesis, the found three dimensional unitary theory is studied in more detail from a canonical point of view. The general higher order action is written in terms of gauge-invariant functions both in flat and de Sitter backgrounds. The analysis is extended by adding static sources, spinning masses and the gravitational Chern-Simons term separately to the theory in the case of flat spacetime. For all cases the microscopic spectrum and the masses are found. In the discussion of curved spacetime, the masses are found in the relativistic and non-relativistic limits. In the Appendix, some useful calculations that are frequently used in the bulk of the thesis are given.
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Bahamonde, Sebastian. "Modified teleparallel theories of gravity." Thesis, University College London (University of London), 2018. http://discovery.ucl.ac.uk/10055604/.

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Teleparallel gravity is an alternative formulation of gravity which has the same field equations as General Relativity (GR), therefore, it is also known as the Teleparallel equivalent of General Relativity (TEGR). This theory is a gauge theory of the translations with the torsion tensor being non-zero but with a vanishing curvature tensor, hence, the manifold is globally flat. An interesting approach for understanding the late-time accelerating behaviour of the Universe is called modified gravity where GR is extended or modified. In the same spirit, since TEGR is equivalent to GR, one can consider its modifications and study if they can describe the current cosmological observations. This thesis is devoted to studying several modified Teleparallel theories of gravity with emphasis on late-time cosmology. Those Teleparallel theories are in general different to the modified theories based on GR, but one can relate and classify them accordingly. Various Teleparallel theories are presented and studied such as Teleparallel scalar-tensor theories, quintom models, Teleparallel non-local gravity, and f(T,B) gravity and its extensions (coupled with matter, extensions of new GR and Gauss-Bonnet) where T is the scalar torsion and B is the boundary term which is related with the Ricci scalar via R=-T+B.
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Schreckenberg, Stephan Reinhold. "Structural foundations of quantum history theories." Thesis, Imperial College London, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.309236.

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Michele, Oliosi. "New viable theories of modified gravity : Minimal Theories and Quasidilaton." Kyoto University, 2019. http://hdl.handle.net/2433/244509.

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Books on the topic "Foundations of gravity theories"

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Frè, P. Gravity, a Geometrical Course: Volume 2: Black Holes, Cosmology and Introduction to Supergravity. Dordrecht: Springer Netherlands, 2013.

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Frè, P. Gravity, a Geometrical Course: Volume 1: Development of the Theory and Basic Physical Applications. Dordrecht: Springer Netherlands, 2013.

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Narlikar, Jayant V., and T. Padmanabhan. Gravity, Gauge Theories and Quantum Cosmology. Dordrecht: Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4508-1.

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Vecchiato, Alberto. Variational Approach to Gravity Field Theories. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-51211-2.

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T, Schucker, ed. Differential geometry, guage theories and gravity. Cambridge: CUP, 1989.

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Narlikar, Jayant V. Gravity, Gauge Theories and Quantum Cosmology. Dordrecht: Springer Netherlands, 1986.

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1957-, Padmanabhan T., ed. Gravity, gauge theories, and quantum cosmology. Dordrecht, Holland: Reidel, 1986.

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T, Schücker, ed. Differential geometry, gauge theories, and gravity. Cambridge, [Cambridgeshire]: Cambridge University Press, 1987.

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Mannheim, Philip D. Brane-localized gravity. Singapore: World Scientific, 2004.

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Dean, Rickles, French Steven, and Saatsi Juha, eds. The structural foundations of quantum gravity. Oxford: Clarendon, 2006.

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Book chapters on the topic "Foundations of gravity theories"

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Ulbricht, Hendrik. "Testing Fundamental Physics by Using Levitated Mechanical Systems." In Molecular Beams in Physics and Chemistry, 303–32. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-63963-1_15.

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AbstractWe will describe recent progress of experiments towards realising large-mass single particle experiments to test fundamental physics theories such as quantum mechanics and gravity, but also specific candidates of Dark Matter and Dark Energy. We will highlight the connection to the work started by Otto Stern as levitated mechanics experiments are about controlling the centre of mass motion of massive particles and using the same to investigate physical effects. This chapter originated from the foundations of physics session of the Otto Stern Fest at Frankfurt am Main in 2019, so we will also share a view on the Stern Gerlach experiment and how it related to tests of the principle of quantum superposition.
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Verruijt, Arnold. "Gravity Foundations." In Theory and Applications of Transport in Porous Media, 194–203. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-017-1112-8_11.

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Aldrovandi, Ruben, and José Geraldo Pereira. "Gauge Theories and Gravitation." In Teleparallel Gravity, 25–38. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-5143-9_3.

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’t Hooft, Gerard. "Quantum Gravity." In Fundamental Theories of Physics, 89–90. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-41285-6_6.

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Asselmeyer-Maluga, Torsten. "Smooth Quantum Gravity: Exotic Smoothness and Quantum Gravity." In Fundamental Theories of Physics, 247–308. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-31299-6_15.

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Anderson, Edward. "Quantum Gravity Programs." In Fundamental Theories of Physics, 157–79. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-58848-3_11.

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Martín-Moruno, Prado. "Horndeski/Galileon Theories." In Modified Gravity and Cosmology, 79–87. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-83715-0_6.

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Baryshev, Yurij, and Pekka Teerikorpi. "Predictions of Gravity Theories." In Fundamental Questions of Practical Cosmology, 111–30. Dordrecht: Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-94-007-2379-5_6.

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Park, R. G. "Gravity-controlled structures." In Foundations of Structural Geology, 99–104. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-011-6576-1_12.

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Anselmann, Christina. "Theoretical Foundations." In Secular Stagnation Theories, 25–35. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-41087-2_2.

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Conference papers on the topic "Foundations of gravity theories"

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Francaviglia, Mauro, and Lorenzo Fatibene. "From the Ehlers-Pirani-Schild analysis on the foundations of gravitational theories to extended theories of gravity and dark matter." In Proceedings of the Corfu Summer Institute 2011. Trieste, Italy: Sissa Medialab, 2012. http://dx.doi.org/10.22323/1.155.0054.

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Sobreiro, Rodrigo Ferreira. "Gauge theories and gravity." In 7th International Conference on Mathematical Methods in Physics. Trieste, Italy: Sissa Medialab, 2013. http://dx.doi.org/10.22323/1.175.0019.

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Rivelles, Victor O. "Noncommutative Theories and Gravity." In Fourth International Winter Conference on Mathematical Methods in Physics. Trieste, Italy: Sissa Medialab, 2004. http://dx.doi.org/10.22323/1.013.0029.

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MANN, ROBERT. "A6: ALTERNATIVE THEORIES OF GRAVITY." In Proceedings of the 16th International Conference. WORLD SCIENTIFIC, 2002. http://dx.doi.org/10.1142/9789812776556_0022.

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WILL, CLIFFORD M. "A6: ALTERNATIVE THEORIES OF GRAVITY." In Proceedings of the 17th International Conference. WORLD SCIENTIFIC, 2005. http://dx.doi.org/10.1142/9789812701688_0022.

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Krajewski, Thomas. "Group Field Theories." In 3rd Quantum Gravity and Quantum Geometry School. Trieste, Italy: Sissa Medialab, 2013. http://dx.doi.org/10.22323/1.140.0005.

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Olmo, Gonzalo J. "Cosmology in Palatini theories of gravity." In TOWARDS NEW PARADIGMS: PROCEEDING OF THE SPANISH RELATIVITY MEETING 2011. AIP, 2012. http://dx.doi.org/10.1063/1.4734415.

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PERIVOLAROPOULOS, L. "OBSERVATIONAL SIGNATURE OF EXTENDED GRAVITY THEORIES." In Proceedings of the Sixth International Workshop. WORLD SCIENTIFIC, 2007. http://dx.doi.org/10.1142/9789812770288_0084.

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Arbuzova, Elena. "Instabilities in modified theories of gravity." In Multifrequency Behaviour of High Energy Cosmic Sources - XIII. Trieste, Italy: Sissa Medialab, 2020. http://dx.doi.org/10.22323/1.362.0026.

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Novikov-Borodin, A. V., and Andrei Yu Khrennikov. "Quantum Theories and Relativistic Approach." In QUANTUM THEORY: Reconsideration of Foundations—5. AIP, 2010. http://dx.doi.org/10.1063/1.3431512.

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Reports on the topic "Foundations of gravity theories"

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Perelstein, M. Topics in Theories of Quantum Gravity. Office of Scientific and Technical Information (OSTI), April 2005. http://dx.doi.org/10.2172/839827.

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Lim, Hyun. Nonlinear Dynamics of Modified Gravity Theories. Office of Scientific and Technical Information (OSTI), December 2020. http://dx.doi.org/10.2172/1727409.

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Evenett, Simon, and Wolfgang Keller. On Theories Explaining the Success of the Gravity Equation. Cambridge, MA: National Bureau of Economic Research, April 1998. http://dx.doi.org/10.3386/w6529.

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Rizzo, Thomas G. Using Scalars to Probe Theories of Low Scale Quantum Gravity. Office of Scientific and Technical Information (OSTI), March 1999. http://dx.doi.org/10.2172/10016.

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Faraggi, A. E., and J. C. Pati. Meeting the constraint of neutrino-Higgsino mixing in gravity unified theories. Office of Scientific and Technical Information (OSTI), February 1997. http://dx.doi.org/10.2172/466855.

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Awada, M., and Zongan Qiu. The critical points of the multimatrix model as the theories of 2-d W-gravity. Office of Scientific and Technical Information (OSTI), March 1990. http://dx.doi.org/10.2172/6767420.

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Rizzo, Thomas G. Top Quark Production at the Tevatron: Probing Anomalous Chromomagnetic Moments and Theories of Low Scale Gravity. Office of Scientific and Technical Information (OSTI), February 1999. http://dx.doi.org/10.2172/9950.

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Semerikov, Serhiy O., Illia O. Teplytskyi, Yuliia V. Yechkalo, and Arnold E. Kiv. Computer Simulation of Neural Networks Using Spreadsheets: The Dawn of the Age of Camelot. [б. в.], November 2018. http://dx.doi.org/10.31812/123456789/2648.

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Abstract:
The article substantiates the necessity to develop training methods of computer simulation of neural networks in the spreadsheet environment. The systematic review of their application to simulating artificial neural networks is performed. The authors distinguish basic approaches to solving the problem of network computer simulation training in the spreadsheet environment, joint application of spreadsheets and tools of neural network simulation, application of third-party add-ins to spreadsheets, development of macros using the embedded languages of spreadsheets; use of standard spreadsheet add-ins for non-linear optimization, creation of neural networks in the spreadsheet environment without add-ins and macros. After analyzing a collection of writings of 1890-1950, the research determines the role of the scientific journal “Bulletin of Mathematical Biophysics”, its founder Nicolas Rashevsky and the scientific community around the journal in creating and developing models and methods of computational neuroscience. There are identified psychophysical basics of creating neural networks, mathematical foundations of neural computing and methods of neuroengineering (image recognition, in particular). The role of Walter Pitts in combining the descriptive and quantitative theories of training is discussed. It is shown that to acquire neural simulation competences in the spreadsheet environment, one should master the models based on the historical and genetic approach. It is indicated that there are three groups of models, which are promising in terms of developing corresponding methods – the continuous two-factor model of Rashevsky, the discrete model of McCulloch and Pitts, and the discrete-continuous models of Householder and Landahl.
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