Verdaguer, E. (Enric)
Overview
Works:  39 works in 119 publications in 3 languages and 2,410 library holdings 

Genres:  Conference papers and proceedings 
Roles:  Author, Editor, Other, ed 
Classifications:  QC174.26.W28, 530.14 
Publication Timeline
.
Most widely held works by
E Verdaguer
Gravitational solitons by
V Belinski(
)
22 editions published between 2001 and 2005 in English and held by 1,858 WorldCat member libraries worldwide
This volume provides an exposition of the theory of gravitational solitons, with a review of exact soliton solutions to Einstein's equations
22 editions published between 2001 and 2005 in English and held by 1,858 WorldCat member libraries worldwide
This volume provides an exposition of the theory of gravitational solitons, with a review of exact soliton solutions to Einstein's equations
Relativistic astrophysics and cosmology : proceedings of the XIVth GIFT International Seminar on Theoretical Physics : 27
June1 July 1983, Sant Feliu de Guíxols, Catalonia, Spain by International Seminar on Theoretical Physics(
Book
)
16 editions published in 1984 in English and held by 171 WorldCat member libraries worldwide
16 editions published in 1984 in English and held by 171 WorldCat member libraries worldwide
Semiclassical and stochastic gravity : quantum field effects on curved spacetime by
B. L Hu(
)
7 editions published in 2020 in English and held by 120 WorldCat member libraries worldwide
"The two pillars of modern physics are general relativity and quantum field theory, the former describes the large scale structure and dynamics of spacetime, the latter, the microscopic constituents of matter. Combining the two yields quantum field theory in curved spacetime, which is needed to understand quantum field processes in the early universe and black holes, such as the wellknown Hawking effect. This book examines the effects of quantum field processes backreacting on the background spacetime which become important near the Planck time (1043 sec). It explores the selfconsistent description of both spacetime and matter via the semiclassical Einstein equation of semiclassical gravity theory, exemplified by the inflationary cosmology, and fluctuations of quantum fields which underpin stochastic gravity, necessary for the description of metric fluctuations (spacetime foams). Covering over four decades of thematic development, this book is a valuable resource for researchers interested in quantum field theory, gravitation and cosmology"
7 editions published in 2020 in English and held by 120 WorldCat member libraries worldwide
"The two pillars of modern physics are general relativity and quantum field theory, the former describes the large scale structure and dynamics of spacetime, the latter, the microscopic constituents of matter. Combining the two yields quantum field theory in curved spacetime, which is needed to understand quantum field processes in the early universe and black holes, such as the wellknown Hawking effect. This book examines the effects of quantum field processes backreacting on the background spacetime which become important near the Planck time (1043 sec). It explores the selfconsistent description of both spacetime and matter via the semiclassical Einstein equation of semiclassical gravity theory, exemplified by the inflationary cosmology, and fluctuations of quantum fields which underpin stochastic gravity, necessary for the description of metric fluctuations (spacetime foams). Covering over four decades of thematic development, this book is a valuable resource for researchers interested in quantum field theory, gravitation and cosmology"
Recent developments in gravitation : proceedings of the Relativity Meeting89, Barcelona, Catalonia, Spain, 58 September
1989 by
E Verdaguer(
Book
)
11 editions published between 1990 and 2014 in English and held by 106 WorldCat member libraries worldwide
This volume reviews some recent developments and new perspectives in classical and Quantum Gravity. The topics treated at a graduate level range from some new and old problems in General Relativity, algebraic computing, gravitational wave astronomy to some more speculative subjects as the early Universe, Quantum Gravity and Quantum Cosmology. Contents: Low Energy Effects of Quantum Gravity (E Alvarez); Rigid Motion Invariance of Newtonian and Einstein's Theories of General Relativity (L Bel); General Relativity and the Early Universe (B J Carr); Computer Algebra and Exact Solutions of the Eins
11 editions published between 1990 and 2014 in English and held by 106 WorldCat member libraries worldwide
This volume reviews some recent developments and new perspectives in classical and Quantum Gravity. The topics treated at a graduate level range from some new and old problems in General Relativity, algebraic computing, gravitational wave astronomy to some more speculative subjects as the early Universe, Quantum Gravity and Quantum Cosmology. Contents: Low Energy Effects of Quantum Gravity (E Alvarez); Rigid Motion Invariance of Newtonian and Einstein's Theories of General Relativity (L Bel); General Relativity and the Early Universe (B J Carr); Computer Algebra and Exact Solutions of the Eins
Quantum gravity and cosmology : proceedings of the XXIIth GIFT International Seminar on Theoretical Physics : 38 June 1991,
Sant Feliu de Guíxols, Catalonia, Spain by GIFT International Seminar on Theoretical Physics(
Book
)
8 editions published in 1992 in English and Undetermined and held by 73 WorldCat member libraries worldwide
I. QUANTUM GRAVITY: Recent Developments in Nonperturbative Quantum Gravity  Some General Problems in Quantum Gravity  The Environment, Decoherence, and the Transition from Quantum to Classical  II. QUANTUM COSMOLOGY: Introduction and Applications of Quantum Cosmology  Consequences of Extended Inflation
8 editions published in 1992 in English and Undetermined and held by 73 WorldCat member libraries worldwide
I. QUANTUM GRAVITY: Recent Developments in Nonperturbative Quantum Gravity  Some General Problems in Quantum Gravity  The Environment, Decoherence, and the Transition from Quantum to Classical  II. QUANTUM COSMOLOGY: Introduction and Applications of Quantum Cosmology  Consequences of Extended Inflation
Semiclassical and stochastic gravity : quantum field effects on curvedspacetim by
B. L Hu(
)
1 edition published in 2020 in English and held by 13 WorldCat member libraries worldwide
The two pillars of modern physics are general relativity and quantum field theory, the former describes the large scale structure and dynamics of spacetime, the latter, the microscopic constituents of matter. Combining the two yields quantum field theory in curved spacetime, which is needed to understand quantum field processes in the early universe and black holes, such as the wellknown Hawking effect. This book examines the effects of quantum field processes backreacting on the background spacetime which become important near the Planck time (1043 sec). It explores the selfconsistent description of both spacetime and matter via the semiclassical Einstein equation of semiclassical gravity theory, exemplified by the inflationary cosmology, and fluctuations of quantum fields which underpin stochastic gravity, necessary for the description of metric fluctuations (spacetime foams). Covering over four decades of thematic development, this book is a valuable resource for researchers interested in quantum field theory, gravitation and cosmology
1 edition published in 2020 in English and held by 13 WorldCat member libraries worldwide
The two pillars of modern physics are general relativity and quantum field theory, the former describes the large scale structure and dynamics of spacetime, the latter, the microscopic constituents of matter. Combining the two yields quantum field theory in curved spacetime, which is needed to understand quantum field processes in the early universe and black holes, such as the wellknown Hawking effect. This book examines the effects of quantum field processes backreacting on the background spacetime which become important near the Planck time (1043 sec). It explores the selfconsistent description of both spacetime and matter via the semiclassical Einstein equation of semiclassical gravity theory, exemplified by the inflationary cosmology, and fluctuations of quantum fields which underpin stochastic gravity, necessary for the description of metric fluctuations (spacetime foams). Covering over four decades of thematic development, this book is a valuable resource for researchers interested in quantum field theory, gravitation and cosmology
Soliton solutions in spacetimes with two spacelike Killing fields by
E Verdaguer(
Book
)
3 editions published in 1993 in English and held by 12 WorldCat member libraries worldwide
3 editions published in 1993 in English and held by 12 WorldCat member libraries worldwide
Quantum Gravity and Cosmology  Proceedings of the Xxii Gift International Seminar on Theoretical Physics by
E Elizalde(
)
2 editions published in 1992 in English and held by 7 WorldCat member libraries worldwide
2 editions published in 1992 in English and held by 7 WorldCat member libraries worldwide
Stochastic Gravity: Theory and Applications by
B. L Hu(
)
2 editions published between 2004 and 2008 in English and held by 4 WorldCat member libraries worldwide
2 editions published between 2004 and 2008 in English and held by 4 WorldCat member libraries worldwide
Cosmological perturbations including matter loops a study in de Sitter by Markus Benjamin Fröb(
)
3 editions published between 2013 and 2014 in English and held by 3 WorldCat member libraries worldwide
In this thesis we studied quantum effects in de Sitter space coming from the interaction of gravitons and matter. We derived the lowenergy effective action for metric perturbations which includes corrections from matter loops, in a flat background for scalar fields of arbitrary mass and minimal curvature coupling, and in a de Sitter background for massless scalar fields of minimal and conformal coupling. From this action we derived the semiclassical Einstein equations, which in this case give a small correction to the relation between the cosmological constant and the Hubble constant. To study the stability of the de Sitter background, we derived the equations satisfied by general linear metric perturbations, using the order reduction method which in contrast to a strictly perturbative treatment produces solutions that are reliable for extended periods of time. We solved these equations for an initial vacuum state and for general initial states. In both cases, the induced changes in the Riemann tensor, which is a gauge invariant and local observable, are small and vanish in the infinite future. In this way, we extended the classical nohair theorems of de Sitter space to the quantum case. We calculated also the twopoint function of these perturbations, using a generalization of the flatspace i[epsilon] prescription that permitted us to define an interacting vacuum state [epsilon] in the infinite past. From this correlation function, we obtained a cosmological observable, the power spectrum of tensorial perturbations. The size of the quantum corrections is too small to be measured, being appreciable only if the Hubble constant were of a magnitude comparable to the Planck scale, where the effective theory ceases to be valid. As a local observable, we calculated the twopoint function of the Riemann tensor. The result was decomposed into correlation functions of the Weyl and Ricci tensors and the Ricci scalar, which are de Sitter invariant, showing that there is no physical breaking of this invariance. The twopoint function decay exponentially for large separations, showing that the background curvature acts as an effective mass for the graviton. To generalize these calculations to the interaction with other kinds of matter, we exploited the Bianchi identities to show that the twopoint function of the Riemann tensor always is de Sitter invariance if this is the case for the stressenergy tensor. We gave explicit formulas to calculate it, and saw that the result is completely determined except for an integration constant. This constant can naturally be interpreted as the strength of free gravitons which propagate in the background spacetime, and depends on the unknown coefficients that multiply terms in the gravitational action which involve squares of curvature tensors
3 editions published between 2013 and 2014 in English and held by 3 WorldCat member libraries worldwide
In this thesis we studied quantum effects in de Sitter space coming from the interaction of gravitons and matter. We derived the lowenergy effective action for metric perturbations which includes corrections from matter loops, in a flat background for scalar fields of arbitrary mass and minimal curvature coupling, and in a de Sitter background for massless scalar fields of minimal and conformal coupling. From this action we derived the semiclassical Einstein equations, which in this case give a small correction to the relation between the cosmological constant and the Hubble constant. To study the stability of the de Sitter background, we derived the equations satisfied by general linear metric perturbations, using the order reduction method which in contrast to a strictly perturbative treatment produces solutions that are reliable for extended periods of time. We solved these equations for an initial vacuum state and for general initial states. In both cases, the induced changes in the Riemann tensor, which is a gauge invariant and local observable, are small and vanish in the infinite future. In this way, we extended the classical nohair theorems of de Sitter space to the quantum case. We calculated also the twopoint function of these perturbations, using a generalization of the flatspace i[epsilon] prescription that permitted us to define an interacting vacuum state [epsilon] in the infinite past. From this correlation function, we obtained a cosmological observable, the power spectrum of tensorial perturbations. The size of the quantum corrections is too small to be measured, being appreciable only if the Hubble constant were of a magnitude comparable to the Planck scale, where the effective theory ceases to be valid. As a local observable, we calculated the twopoint function of the Riemann tensor. The result was decomposed into correlation functions of the Weyl and Ricci tensors and the Ricci scalar, which are de Sitter invariant, showing that there is no physical breaking of this invariance. The twopoint function decay exponentially for large separations, showing that the background curvature acts as an effective mass for the graviton. To generalize these calculations to the interaction with other kinds of matter, we exploited the Bianchi identities to show that the twopoint function of the Riemann tensor always is de Sitter invariance if this is the case for the stressenergy tensor. We gave explicit formulas to calculate it, and saw that the result is completely determined except for an integration constant. This constant can naturally be interpreted as the strength of free gravitons which propagate in the background spacetime, and depends on the unknown coefficients that multiply terms in the gravitational action which involve squares of curvature tensors
Peyresq Physics Workshops 11 and 12: "Micro and Macro Structure of Spacetime', June 2006 and June 2007 : [... proceedings
of the workshops ... which were held on the 1723 June 2006 and 1622 June 2007 ... in Peyresq, Alpes de Haute Provence, France
...](
Book
)
2 editions published in 2008 in English and held by 3 WorldCat member libraries worldwide
2 editions published in 2008 in English and held by 3 WorldCat member libraries worldwide
Thermal diagnostics in the LISA Technology Package Experiment by Miquel Nofrarias Serra(
)
3 editions published between 2007 and 2008 in English and held by 3 WorldCat member libraries worldwide
3 editions published between 2007 and 2008 in English and held by 3 WorldCat member libraries worldwide
Particle propagation in nontrivial backgrounds a quantum field theory approach by
D Arteaga(
)
3 editions published in 2007 in English and Spanish and held by 3 WorldCat member libraries worldwide
3 editions published in 2007 in English and Spanish and held by 3 WorldCat member libraries worldwide
The stochastic semiclassical theory of gravity by Rosario Martín Menéndez(
Book
)
2 editions published between 1999 and 2000 in English and held by 2 WorldCat member libraries worldwide
2 editions published between 1999 and 2000 in English and held by 2 WorldCat member libraries worldwide
Gravitational effects of quantum fields in de Sitter spacetime by Guillem Pérez Nadal(
)
2 editions published in 2010 in English and held by 2 WorldCat member libraries worldwide
2 editions published in 2010 in English and held by 2 WorldCat member libraries worldwide
Cuantización de ondas gravitatorias planas by Manuel Montejo Estévez(
Book
)
2 editions published between 1999 and 2004 in Spanish and held by 2 WorldCat member libraries worldwide
2 editions published between 1999 and 2004 in Spanish and held by 2 WorldCat member libraries worldwide
Calcul du coefficient g∞ de la métrique 2postnewtonienne pour un système de ncorps fluide parfait et sphériques by
E Verdaguer(
Book
)
2 editions published in 1976 in French and held by 2 WorldCat member libraries worldwide
2 editions published in 1976 in French and held by 2 WorldCat member libraries worldwide
Métrique 2postnewtonienne pour un système de ncorps fluide parfait et sphériques : calcul de ℊoi et ℊij by
E Verdaguer(
Book
)
2 editions published between 1975 and 1976 in French and held by 2 WorldCat member libraries worldwide
2 editions published between 1975 and 1976 in French and held by 2 WorldCat member libraries worldwide
New applications of the gauge/gravity duality by
Daniel Fernández(
)
2 editions published in 2013 in English and held by 2 WorldCat member libraries worldwide
2 editions published in 2013 in English and held by 2 WorldCat member libraries worldwide
Wave propagation in metamaterials mimicking spacetime geometry: black holes and cosmic strings by Isabel Fernández Núñez(
Book
)
2 editions published in 2018 in English and held by 2 WorldCat member libraries worldwide
In physics, it is common to find different phenomena being described by similar equations. A good analogy can make us look at a problem from a different point of view. In that way, ideas may be transferred from one field of science to another, allowing to model new phenomena after previous, wellstudied ones. In the case of the field of analogue gravity, systems that mimic certain aspects of the physics of curved spacetimes are studied. In this thesis, we are interested in the analogy between geometry and media. It has been known for several decades that light propagation in a gravitational field is formally equivalent to that in a bianisotropic medium. On the one hand, ray paths are bent due to spacetime curvature. On the other hand, spatial variations of the permittivity and permeability of a material can make light follow curved trajectories. These two phenomena can be related mathematically in the context of transformation optics, which provides the tools to determine the medium parameters necessary to mimic a certain coordinate transformation. Materials with these specific properties are not naturally occurring, therefore, the emergence of metamaterial science at the beginning of the century was needed to realize them. Metamaterials are artificial composite materials with subwavelength constitutive elements that exhibit exotic properties. They have been one of the hot topics of the past years given the variety of opportunities they offer: negative refraction, superlenses, indefinite dispersion, invisibility, among many others. In this thesis we study the analogues of two static spacetimes from the point of view of transformation optics: one with spherical symmetry and one with conical geometry. Both cases are inspired by solutions to Einstein's equations: the Schwarzschild black hole and the cosmic string, respectively. For each case, we derive the permittivity and permeability of the analogous material using Plebanski's formulation of the electromagnetic constitutive equations. We solve numerically the wave equation in the metamaterial and compare the results with analytical theories. We find that the spherically symmetric spacetime can be mimicked by either an anisotropic or isotropic medium due to its rotational symmetries. This is achieved by performing a coordinate transformation of the general metric to a conformally flat form. We obtain the medium parameters for both cases and apply the results to the case of the Schwarzschild black hole. We simulate the propagation of a Gaussian beam in the two materials and compare the numerical results with the nullgeodesics in the Schwarzschild spacetime, finding a good agreement. The cosmic string is an example of a topological defect with conical geometry. A conical space can be interpreted as flat space with a wedge removed. We make use of this transformation to study the wave equation in the cosmic string background. We apply asymptotic diffraction theories to obtain analytical models that describe wave propagation of electromagnetic or gravitational waves (in a certain gauge). We find that our expressions reproduce accurately the results of the numerical simulations in the analogous metamaterial. Moreover, with our models, we can understand the observed diffraction pattern as the interference of four characteristic waves. With this interpretation we can introduce the Fresnel observation zones, which are related to the diffraction maxima. They help localize the regions – in either space or frequency – where the wave effects are more significant. In fact, in the diffraction by a noncompact object such as the cosmic string, we find that the contribution to the field of wave effects such as interference or diffraction can be of the same order as the geometrical optics terms. Furthermore, the conical topology also appears in condensed matter systems as disclinations or wedge dislocations, therefore we expect our results to be applicable in those systems as well
2 editions published in 2018 in English and held by 2 WorldCat member libraries worldwide
In physics, it is common to find different phenomena being described by similar equations. A good analogy can make us look at a problem from a different point of view. In that way, ideas may be transferred from one field of science to another, allowing to model new phenomena after previous, wellstudied ones. In the case of the field of analogue gravity, systems that mimic certain aspects of the physics of curved spacetimes are studied. In this thesis, we are interested in the analogy between geometry and media. It has been known for several decades that light propagation in a gravitational field is formally equivalent to that in a bianisotropic medium. On the one hand, ray paths are bent due to spacetime curvature. On the other hand, spatial variations of the permittivity and permeability of a material can make light follow curved trajectories. These two phenomena can be related mathematically in the context of transformation optics, which provides the tools to determine the medium parameters necessary to mimic a certain coordinate transformation. Materials with these specific properties are not naturally occurring, therefore, the emergence of metamaterial science at the beginning of the century was needed to realize them. Metamaterials are artificial composite materials with subwavelength constitutive elements that exhibit exotic properties. They have been one of the hot topics of the past years given the variety of opportunities they offer: negative refraction, superlenses, indefinite dispersion, invisibility, among many others. In this thesis we study the analogues of two static spacetimes from the point of view of transformation optics: one with spherical symmetry and one with conical geometry. Both cases are inspired by solutions to Einstein's equations: the Schwarzschild black hole and the cosmic string, respectively. For each case, we derive the permittivity and permeability of the analogous material using Plebanski's formulation of the electromagnetic constitutive equations. We solve numerically the wave equation in the metamaterial and compare the results with analytical theories. We find that the spherically symmetric spacetime can be mimicked by either an anisotropic or isotropic medium due to its rotational symmetries. This is achieved by performing a coordinate transformation of the general metric to a conformally flat form. We obtain the medium parameters for both cases and apply the results to the case of the Schwarzschild black hole. We simulate the propagation of a Gaussian beam in the two materials and compare the numerical results with the nullgeodesics in the Schwarzschild spacetime, finding a good agreement. The cosmic string is an example of a topological defect with conical geometry. A conical space can be interpreted as flat space with a wedge removed. We make use of this transformation to study the wave equation in the cosmic string background. We apply asymptotic diffraction theories to obtain analytical models that describe wave propagation of electromagnetic or gravitational waves (in a certain gauge). We find that our expressions reproduce accurately the results of the numerical simulations in the analogous metamaterial. Moreover, with our models, we can understand the observed diffraction pattern as the interference of four characteristic waves. With this interpretation we can introduce the Fresnel observation zones, which are related to the diffraction maxima. They help localize the regions – in either space or frequency – where the wave effects are more significant. In fact, in the diffraction by a noncompact object such as the cosmic string, we find that the contribution to the field of wave effects such as interference or diffraction can be of the same order as the geometrical optics terms. Furthermore, the conical topology also appears in condensed matter systems as disclinations or wedge dislocations, therefore we expect our results to be applicable in those systems as well
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Related Identities
 Belinski, V. (Vladimir) 1941 Author
 Fustero, X. (Xavier) Editor
 Hu, B. L. (BeiLok) Author
 Céspedes, J. Editor
 Garriga, J. (Jaume) Editor
 Solà, Joan Other Editor
 Grupo Interuniversitario de Física Teórica (Spain) Other
 PérezMercader, J. Other Editor
 Universitat de Barcelona Departament de Física Fonamental
 Arteaga Barriel, Daniel Author
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