Academic literature on the topic 'Scalar field cosmology'

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Journal articles on the topic "Scalar field cosmology"

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Howard, Eric. "Scalar field cosmology." Contemporary Physics 60, no. 4 (October 2, 2019): 338–39. http://dx.doi.org/10.1080/00107514.2019.1709553.

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VAN HOLTEN, J. W. "SINGLE SCALAR COSMOLOGY." International Journal of Modern Physics A 28, no. 26 (October 20, 2013): 1350132. http://dx.doi.org/10.1142/s0217751x13501327.

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The cosmology of flat Friedmann–Lemaître–Robertson–Walker (FLRW) universes dominated by a single scalar field is discussed. General features of the evolution of the universe and the scalar field are illustrated by specific examples. It is shown that in some situations the most important contribution to inflation comes from the approach to a region of slow roll, rather than from the period of leaving a slow-roll regime.
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Mansoori, Seyed Ali Hosseini, and Zahra Molaee. "Multi-field Cuscuton cosmology." Journal of Cosmology and Astroparticle Physics 2023, no. 01 (January 1, 2023): 022. http://dx.doi.org/10.1088/1475-7516/2023/01/022.

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Abstract In this paper, we first introduce a multi-field setup of Cuscuton gravity in a curved field space manifold. Then, we show that this model allows for a regular bouncing cosmology and it does not lead to ghosts or other instabilities at the level of perturbations. More precisely, by decomposing the scalar fields perturbations into the tangential and normal components with respect to the background field space trajectory, the entropy mode perpendicular to the background trajectory is healthy which directly depends on the signature of the field-space metric, whereas the adiabatic perturbation tangential to the background trajectory is frozen. In analogy with the standard Cuscuton theory equipped with an extra dynamical scalar field, the adiabatic field does not have its own dynamics, but it modifies the dynamics of other dynamical fields like entropy mode in our scenario. Finally, we perform a Hamiltonian analysis of our model in order to count the degrees of freedom propagated by dynamical fields.
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Oliveira-Neto, G. "Scalar field cosmology in three-dimensions." Brazilian Journal of Physics 31, no. 3 (September 2001): 456–60. http://dx.doi.org/10.1590/s0103-97332001000300017.

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Li, Baojiu. "Voids in coupled scalar field cosmology." Monthly Notices of the Royal Astronomical Society 411, no. 4 (December 6, 2010): 2615–27. http://dx.doi.org/10.1111/j.1365-2966.2010.17867.x.

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Faraoni, Valerio, and Charles S. Protheroe. "Scalar field cosmology in phase space." General Relativity and Gravitation 45, no. 1 (September 29, 2012): 103–23. http://dx.doi.org/10.1007/s10714-012-1462-0.

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Zhang, Kai, H. Q. Lu, Wei Fang, and Z. G. Huang. "Cosmology with non-linear scalar field." Astrophysics and Space Science 327, no. 1 (February 11, 2010): 117–24. http://dx.doi.org/10.1007/s10509-010-0292-3.

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Shchigolev, V. K., and E. A. Semenova. "Scalar field cosmology in Lyra's geometry." International Journal of Advanced Astronomy 3, no. 2 (November 5, 2015): 117. http://dx.doi.org/10.14419/ijaa.v3i2.5401.

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<p>The new classes of homogeneous cosmological models for the scalar fields are build in the context of Lyra’s geometry. The different types of exact solution for the model are obtained by applying two procedures, viz the generating function method and the first order formalism.</p>
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Demiański, M., R. de Ritis, G. Marmo, G. Platania, C. Rubano, P. Scudellaro, and C. Stornaiolo. "Scalar field, nonminimal coupling, and cosmology." Physical Review D 44, no. 10 (November 15, 1991): 3136–46. http://dx.doi.org/10.1103/physrevd.44.3136.

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Szydłowski, Marek, Orest Hrycyna, and Aleksander Stachowski. "Scalar field cosmology — geometry of dynamics." International Journal of Geometric Methods in Modern Physics 11, no. 02 (February 2014): 1460012. http://dx.doi.org/10.1142/s0219887814600123.

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We study the Scalar Field Cosmology (SFC) using the geometric language of the phase space. We define and study an ensemble of dynamical systems as a Banach space with a Sobolev metric. The metric in the ensemble is used to measure a distance between different models. We point out the advantages of visualization of dynamics in the phase space. It is investigated the genericity of some class of models in the context of fine tuning of the form of the potential function in the ensemble of SFC. We also study the symmetries of dynamical systems of SFC by searching for their exact solutions. In this context, we stressed the importance of scaling solutions. It is demonstrated that scaling solutions in the phase space are represented by unstable separatrices of the saddle points. Only critical point itself located on two-dimensional stable submanifold can be identified as scaling solution. We have also found a class of potentials of the scalar fields forced by the symmetry of differential equation describing the evolution of the Universe. A class of potentials forced by scaling (homology) symmetries was given. We point out the role of the notion of a structural stability in the context of the problem of indetermination of the potential form of the SFC. We characterize also the class of potentials which reproduces the ΛCDM model, which is known to be structurally stable. We show that the structural stability issue can be effectively used is selection of the scalar field potential function. This enables us to characterize a structurally stable and therefore a generic class of SFC models. We have found a nonempty and dense subset of structurally stable models. We show that these models possess symmetry of homology.
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Dissertations / Theses on the topic "Scalar field cosmology"

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Castro, Fábio Chibana de. "Tachyon Scalar Field Cosmology." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-17052017-063702/.

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In this work we test a cosmological model with an interaction between dark energy and dark matter, where a tachyon scalar field plays the role of dark energy. With that in mind, we developed a numerical code that solves the background equations and extracts the cosmological parameters and we compared the results of the interacting tachyon model with those of other dark energy candidates. Our results show that the model indeed explains the observational data and has interesting cosmological properties, but might face challenges when compared to other dark energy candidates.
Neste trabalho testamos um modelo cosmológico com uma interação entre energia escura e matéria escura, onde um campo escalar taquiônico desempenha o papel da energia escura. Para isso, desenvolvemos um código computacional que resolve as equações numericamente e vincula os parâmetros cosmológicos e, assim, comparamos os resultados do modelo taquiônico interagente com os de outros candidatos à energia escura. Nossas análises mostram que o modelo, de fato, consegue explicar os dados observacionais, além de possuir propriedades cosmológicas interessantes, mas apresenta dificuldades quando comparado a outros modelos de energia escura.
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Westmoreland, Shawn. "Energy conditions and scalar field cosmology." Kansas State University, 2013. http://hdl.handle.net/2097/15811.

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Master of Science
Department of Physics
Bharat Ratra
In this report, we discuss the four standard energy conditions of General Relativity (null, weak, dominant, and strong) and investigate their cosmological consequences. We note that these energy conditions can be compatible with cosmic acceleration provided that a repulsive cosmological constant exists and the acceleration stays within certain bounds. Scalar fields and dark energy, and their relationships to the energy conditions, are also discussed. Special attention is paid to the 1988 Ratra-Peebles scalar field model, which is notable in that it provides a physical self-consistent framework for the phenomenology of dark energy. Appendix B, which is part of joint-research with Anatoly Pavlov, Khaled Saaidi, and Bharat Ratra, reports on the existence of the Ratra-Peebles scalar field tracker solution in a curvature-dominated universe, and discusses the problem of investigating the evolution of long-wavelength inhomogeneities in this solution while taking into account the gravitational back-reaction (in the linear perturbative approximation).
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Kujat, Jens. "Scalar fields in cosmology." Columbus, Ohio : Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1142978764.

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Laycock, Andrew Mark. "Aspects of non-minimally coupled scalar field cosmology." Thesis, University of Sussex, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.282083.

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Graham, Alexander Alan Hewetson. "Scalar fields in cosmology and black holes." Thesis, University of Cambridge, 2016. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.709524.

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Parsons, Paul. "Scalar-field models of the early universe." Thesis, University of Sussex, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.390077.

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Leith, Ben Maitland. "Scalar Fields and Alternatives in Cosmology and Black Holes." Thesis, University of Canterbury. Physics and Astronomy, 2007. http://hdl.handle.net/10092/1444.

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Extensions to general relativity are often considered as possibilities in the quest for a quantum theory of gravity on one hand, or to resolve anomalies within cosmology on the other. Scalar fields, found in many areas of physics, are frequently studied in this context. This is partly due to their manifestation in the effective four dimensional theory of a number of underlying fundamental theories, most notably string theory. This thesis is concerned with the effects of scalar fields on cosmological and black hole solutions. By comparison, an analysis of an inhomogeneous cosmological model which requires no extensions to general relativity is also undertaken. In chapter three, examples of numerical solutions to black hole solutions, which have previously been shown to be linearly stable, are found. The model includes at least two scalar fields, non-minimally coupled to electromagnetism and hence possesses non-trivial contingent primary hair. We show that the extremal solutions have finite temperature for an arbitrary coupling constant. Chapter four investigates the effects of higher order curvature corrections and scalar fields on the late-time cosmological evolution. We find solutions which mimic many of the phenomenological features seen in the post-inflation Universe. The effects due to non-minimal scalar couplings to matter are also shown to be negligible in this context. Such solutions can be shown to be stable under homogeneous perturbations. Some restrictions on the value of the slope of the scalar coupling to the Gauss-Bonnet term are found to be necessary to avoid late-time superluminal behaviour and dominant energy condition violation. A number of observational tests are carried out in chapter five on a new approach to averaging the inhomogeneous Universe. In this "Fractal Bubble model" cosmic acceleration is realised as an apparent effect, due to quasilocal gravitational energy gradients. We show that a good fit can be found to three separate observations, the type Ia supernovae, the baryon acoustic oscillation scale and the angular scale of the sound horizon at last scattering. The best fit to the supernovae data is χ² ≃ 0:9 per degree of freedom, with a Hubble parameter at the present epoch of H0 = 61:7+1:4 -1:3 km sec⁻¹ Mpc⁻¹ , and a present epoch volume void fraction of 0:76 ± 0:05.
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Bertacca, Daniele. "Unified Dark Matter in Scalar Field Cosmologies." Doctoral thesis, Università degli studi di Padova, 2008. http://hdl.handle.net/11577/3425159.

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In this thesis I have investigated the possibility that the dynamics of a single scalar field can account for a unified description of the Dark Matter and Dark Energy sectors: Unified Dark Matter (UDM). In particular considering the general Lagrangian of k-essence models, I study and classify them through variables connected to the fluid equation of state parameter w_kappa. This allows to find solutions around which the scalar field describes a mixture of dark matter and cosmological constant-like dark energy (UDM) (Bertacca, Matarrese, Pietroni 2007). Subsequently I also perform an analytical study of the Integrated Sachs-Wolfe (ISW) effect within the framework of Unified Dark Matter models based on a scalar field which aim at a unified description of dark energy and dark matter. Computing the temperature power spectrum of the Cosmic Microwave Background anisotropies I am able to isolate those contributions that can potentially lead to strong deviations from the usual ISW effect occurring in a Lambda CDM Universe. This helps to highlight the crucial role played by the sound speed in the unified dark matter models. This treatment is completely general in that all the results depend only on the speed of sound of the dark component and thus it can be applied to a variety of unified models, including those which are not described by a scalar field but relies on a single dark fluid (Bertacca and Bartolo 2007). Finally I also investigated the static and spherically symmetric solutions of Einstein's equations for a scalar field with non-canonical kinetic term (Bertacca, Bartolo, Matarrese 2007).
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Foster, Scott. "Singularity structure of scalar field cosmologies /." Title page, contents and abstract only, 1996. http://web4.library.adelaide.edu.au/theses/09PH/09phf757.pdf.

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Rossi, Massimo. "Dark energy as a scalar field non-minimally coupled to gravity." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/12825/.

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The cosmological constant is not the only possibility in order to describe the accelerated expansion of the Universe. A different approach is to modify the gravitational sector of the Einstein equations. In scalar-tensor theories the gravitational interaction is affected by both a scalar and a tensor field. The dependence of gravity from the scalar field is obtained through a non-minimal coupling function which multiplies the Ricci scalar in the Lagrangian. In this thesis we consider a specific shape of the coupling function that reduces to the minimal coupling case and to the induced gravity case for specific choices of the parameters. We consider two shapes for the potential: one leads to an effectively massless Klein-Gordon equation while the other is motivated by the fact that it is a viable potential for the chaotic inflation in superconformal theory. For the former we consider also the conformal coupling case, which is the required coupling in order to obtain a conformally invariant theory. We derive the fundamental equation at the background and linear perturbations level and then we recover the initial condition for the perturbations. In order to study the evolution for the background and linear fluctuations within non-minimally coupling we modified the publicly available Einstein-Boltzmann code CLASS. The evolution of the dark energy density parameter and the equation of state are shown. Furthermore we pay attention to the actual value of the post-Newtonian parameters in order to see which choices of the parameters satisfies the Solar System constraints. We present the results obtained for CMB anisotropies, linear matter power spectrum, metric and scalar field perturbations. As for the background we confront them with the ΛCDM model for both the potential considered.
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Books on the topic "Scalar field cosmology"

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C.J.A.P. Martins (Editor), P. P. Avelino (Editor), M. S. Costa (Editor), K. Mack (Editor), M. F. Mota (Editor), and M. Parry (Editor), eds. Phi in the Sky: The Quest for Cosmological Scalar Fields (AIP Conference Proceedings / Astronomy and Astrophysics). American Institute of Physics, 2004.

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Phi in the sky: The quest for cosmological scalar fields, Porto, Portugal 8-10 July 2004. Melville, N.Y: American Institute of Physics, 2004.

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Maggiore, Michele. Inflation and primordial perturbations. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198570899.003.0012.

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Review of inflationary cosmology. Single-field slow-roll inflation. Large-field inflation and small-field inflation. Starobinsky model. Quantum field theory in curved space. Generation of primordial perturbations during inflation. Mukhanov-Sasaki equation. Scalar and tensor perturbations.
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Kachelriess, Michael. Quantum Fields. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198802877.001.0001.

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This book introduces quantum field theory, together with its most important applications to cosmology and astroparticle physics, in a coherent framework. The path-integral approach is employed right from the start, and the use of Green functions and generating functionals is illustrated first in quantum mechanics and then in scalar field theory. Massless spin one and two fields are discussed on an equal footing, and gravity is presented as a gauge theory in close analogy with the Yang–Mills case. Concepts relevant to modern research such as helicity methods, effective theories, decoupling, or the stability of the electroweak vacuum are introduced. Various applications such as topological defects, dark matter, baryogenesis, processes in external gravitational fields, inflation and black holes help students to bridge the gap between undergraduate courses and the research literature.
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Davidson, Sacha, Paolo Gambino, Mikko Laine, Matthias Neubert, and Christophe Salomon, eds. Effective Field Theory in Particle Physics and Cosmology. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780198855743.001.0001.

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Effective field theory (EFT) is a general method for describing quantum systems with multiple-length scales in a tractable fashion. It allows us to perform precise calculations in established models (such as the standard models of particle physics and cosmology), as well as to concisely parametrize possible effects from physics beyond the standard models. EFTs have become key tools in the theoretical analysis of particle physics experiments and cosmological observations, despite being absent from many textbooks. This volume aims to provide a comprehensive introduction to many of the EFTs in use today, and covers topics that include large-scale structure, WIMPs, dark matter, heavy quark effective theory, flavour physics, soft-collinear effective theory, and more.
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Peebles, P. J. E. Principles of Physical Cosmology. Princeton University Press, 2020. http://dx.doi.org/10.23943/princeton/9780691209814.001.0001.

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This book is the essential introduction to this critical area of modern physics, written by a leading pioneer who has shaped the course of the field for decades. The book provides an authoritative overview of the field, showing how observation has combined with theory to establish the science of physical cosmology. The book presents the elements of physical cosmology, including the history of the discovery of the expanding universe; surveys the cosmological tests that measure the geometry of space-time, with a discussion of general relativity as the basis for these tests; and reviews the origin of galaxies and the large-scale structure of the universe. Now featuring the author's 2019 Nobel lecture, the book remains an indispensable reference for students and researchers alike.
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Maggiore, Michele. Gravitational Waves. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198570899.001.0001.

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A comprehensive and detailed account of the physics of gravitational waves and their role in astrophysics and cosmology. The part on astrophysical sources of gravitational waves includes chapters on GWs from supernovae, neutron stars (neutron star normal modes, CFS instability, r-modes), black-hole perturbation theory (Regge-Wheeler and Zerilli equations, Teukoslky equation for rotating BHs, quasi-normal modes) coalescing compact binaries (effective one-body formalism, numerical relativity), discovery of gravitational waves at the advanced LIGO interferometers (discoveries of GW150914, GW151226, tests of general relativity, astrophysical implications), supermassive black holes (supermassive black-hole binaries, EMRI, relevance for LISA and pulsar timing arrays). The part on gravitational waves and cosmology include discussions of FRW cosmology, cosmological perturbation theory (helicity decomposition, scalar and tensor perturbations, Bardeen variables, power spectra, transfer functions for scalar and tensor modes), the effects of GWs on the Cosmic Microwave Background (ISW effect, CMB polarization, E and B modes), inflation (amplification of vacuum fluctuations, quantum fields in curved space, generation of scalar and tensor perturbations, Mukhanov-Sasaki equation,reheating, preheating), stochastic backgrounds of cosmological origin (phase transitions, cosmic strings, alternatives to inflation, bounds on primordial GWs) and search of stochastic backgrounds with Pulsar Timing Arrays (PTA).
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Book chapters on the topic "Scalar field cosmology"

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Borja, Enrique F., Iñaki Garay, and Eckhard Strobel. "The Quantum Scalar Field in Spherically Symmetric Loop Quantum Gravity." In Progress in Mathematical Relativity, Gravitation and Cosmology, 153–56. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-40157-2_15.

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Chattopadhyay, Surajit, and Antonio Pasqua. "Consequences of Holographic Scalar Field Dark Energy Models in Chameleon Brans-Dicke Cosmology." In Springer Proceedings in Physics, 487–92. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-25619-1_74.

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Szydlowski, Marek. "Chaotic Friedman-Robertson-Walker Cosmology Coupled to a Real Free Massive Scalar Field in Maupertuis Picture." In Hamiltonian Mechanics, 329–33. Boston, MA: Springer US, 1994. http://dx.doi.org/10.1007/978-1-4899-0964-0_33.

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Mimoso, José Pedro. "The Dynamics of Scalar Fields in Cosmology." In Dynamics, Games and Science II, 543–47. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-14788-3_38.

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Walker, William D. "Experimental Evidence of Near-Field Superluminally Propagating Electromagnetic Fields." In Gravitation and Cosmology: From the Hubble Radius to the Planck Scale, 189–96. Dordrecht: Springer Netherlands, 2002. http://dx.doi.org/10.1007/0-306-48052-2_18.

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Rudaz, Serge. "Scalar Fields in Particle Physics and Cosmology: Selected Introductory Topics." In Techniques and Concepts of High-Energy Physics VII, 1–54. Boston, MA: Springer US, 1994. http://dx.doi.org/10.1007/978-1-4615-2419-9_1.

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Lehnert, Bo. "New Developments in Electromagnetic Field Theory." In Gravitation and Cosmology: From the Hubble Radius to the Planck Scale, 125–46. Dordrecht: Springer Netherlands, 2002. http://dx.doi.org/10.1007/0-306-48052-2_13.

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Dvoeglazov, Valeri V. "What is the Evans-Vigier Field?" In Gravitation and Cosmology: From the Hubble Radius to the Planck Scale, 167–82. Dordrecht: Springer Netherlands, 2002. http://dx.doi.org/10.1007/0-306-48052-2_16.

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Sarfatti, Jack. "Progress in Post-Quantum Physics and Unified Field Theory." In Gravitation and Cosmology: From the Hubble Radius to the Planck Scale, 419–30. Dordrecht: Springer Netherlands, 2002. http://dx.doi.org/10.1007/0-306-48052-2_43.

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Vigier, J. P., and R. L. Amoroso. "Can one Unify Gravity and Electromagnetic Fields?" In Gravitation and Cosmology: From the Hubble Radius to the Planck Scale, 241–58. Dordrecht: Springer Netherlands, 2002. http://dx.doi.org/10.1007/0-306-48052-2_23.

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Conference papers on the topic "Scalar field cosmology"

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Perrotta, Francesca, and Carlo Baccigalupi. "Scalar field-dominated cosmologies." In 3 K COSMOLOGY. ASCE, 1999. http://dx.doi.org/10.1063/1.59341.

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FALCIANO, F. T., and N. PINTO-NETO. "SCALAR PERTURBATIONS IN SCALAR FIELD QUANTUM COSMOLOGY." In Proceedings of the MG12 Meeting on General Relativity. WORLD SCIENTIFIC, 2012. http://dx.doi.org/10.1142/9789814374552_0243.

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Díaz Barrón, L. R., J. C. López-Domínguez, M. Sabido, C. Yee, H. A. Morales-Tecotl, L. A. Urena-Lopez, R. Linares-Romero, and H. H. Garcia-Compean. "Noncommutative Quantum Scalar Field Cosmology." In GRAVITATIONAL PHYSICS: TESTING GRAVITY FROM SUBMILLIMETER TO COSMIC: Proceedings of the VIII Mexican School on Gravitation and Mathematical Physics. AIP, 2010. http://dx.doi.org/10.1063/1.3473852.

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Fay, S. "Scalar Field Constraints from Homogeneous Cosmology." In PHI IN THE SKY: The Quest for Cosmological Scalar Fields. AIP, 2004. http://dx.doi.org/10.1063/1.1835178.

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Gordon, Christopher. "Resolving scalar field perturbations into entropy and adiabatic components." In Cosmology and particle physics. AIP, 2001. http://dx.doi.org/10.1063/1.1363530.

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Barranco, J., A. Bernal, Alfredo Herrera-Aguilar, Francisco S. Guzmán Murillo, Ulises Nucamendi Gómez, and Israel Quiros. "Quantized scalar field as DM: the axion’s case." In GRAVITATION AND COSMOLOGY: Proceedings of the Third International Meeting on Gravitation and Cosmology. AIP, 2008. http://dx.doi.org/10.1063/1.3058563.

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TOPORENSKY, ALEXEY. "REGULAR AND CHAOTIC REGIMES IN SCALAR FIELD COSMOLOGY." In Proceedings of the MG12 Meeting on General Relativity. WORLD SCIENTIFIC, 2012. http://dx.doi.org/10.1142/9789814374552_0324.

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ARTYMOWSKI, MICHAŁ, ANDREA DAPOR, and TOMASZ PAWŁOWSKI. "LOOP QUANTUM COSMOLOGY FOR NONMINIMALLY COUPLED SCALAR FIELD." In Proceedings of the MG13 Meeting on General Relativity. WORLD SCIENTIFIC, 2015. http://dx.doi.org/10.1142/9789814623995_0415.

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HARADA, TOMOHIRO. "BLACK HOLES IN SCALAR FIELD OR QUINTESSENTIAL COSMOLOGY." In Proceedings of the MG11 Meeting on General Relativity. World Scientific Publishing Company, 2008. http://dx.doi.org/10.1142/9789812834300_0083.

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Noh, Hyerim. "CMBR constraints on an inflation model with nonminimal scalar field." In Cosmology and particle physics. AIP, 2001. http://dx.doi.org/10.1063/1.1363537.

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