modified actions for gravity: theory and phenomenology
... theory, metric, Palatini and metric-affine gravity and Gauss–Bonnet gravity, and their theoretical characteristics are thoroughly presented. Chapter 4 contains a discussion about the possible dynamical equivalence between these theories, while in Chapter 5 their cosmological phenomenology is present ...
... theory, metric, Palatini and metric-affine gravity and Gauss–Bonnet gravity, and their theoretical characteristics are thoroughly presented. Chapter 4 contains a discussion about the possible dynamical equivalence between these theories, while in Chapter 5 their cosmological phenomenology is present ...
How far are we from the quantum theory of gravity?
... Here hab is defined to be a small excitation on a flat background η ab . All such approaches to the quantization of general relativity were found to fail at some low order in perturbation theory, yielding theories that were perturbatively nonrenormalizable. Various attempts were made to save the sit ...
... Here hab is defined to be a small excitation on a flat background η ab . All such approaches to the quantization of general relativity were found to fail at some low order in perturbation theory, yielding theories that were perturbatively nonrenormalizable. Various attempts were made to save the sit ...
Spin Foam Models for Quantum Gravity
... According to the (background dependent) perspective of standard QFT [2], non renormalizability signals the inconsistency of the theory at high energies to be corrected by a more fundamental theory in the UV regime. A classical example of this is Fermi’s fourfermion theory as an effective description ...
... According to the (background dependent) perspective of standard QFT [2], non renormalizability signals the inconsistency of the theory at high energies to be corrected by a more fundamental theory in the UV regime. A classical example of this is Fermi’s fourfermion theory as an effective description ...
Entanglement Theory and the Second Law of Thermodynamics
... Operations – The correct choice of the set of operations employed is crucial for establishing reversibility in entanglement manipulation. To motivate this choice it is instructive to note that in the context of the second law it follows both from the approach of Giles2 as well as Lieb and Yngvason3 ...
... Operations – The correct choice of the set of operations employed is crucial for establishing reversibility in entanglement manipulation. To motivate this choice it is instructive to note that in the context of the second law it follows both from the approach of Giles2 as well as Lieb and Yngvason3 ...
Introduction to Nonequilibrium Quantum Field Theory
... with the approach to thermal equilibrium at late times. Understanding the “link” between the earlyand the late-time behavior of quantum fields is crucial for a wide range of phenomena. For the first time questions such as the explosive particle production at the end of the inflationary universe, inc ...
... with the approach to thermal equilibrium at late times. Understanding the “link” between the earlyand the late-time behavior of quantum fields is crucial for a wide range of phenomena. For the first time questions such as the explosive particle production at the end of the inflationary universe, inc ...
THE RENORMALIZATION GROUP AND CRITICAL PHENOMENA
... volume of the magnet is finite, e -I’ II must be integrated over M, with analytic results. It is only in the thermodynamic limit V + x that the average of em’. ” is constructed by minimizing F with respect to M. and the nonanalyticity of Eqn. (4) occurs. The Landau theory has the same physical motiv ...
... volume of the magnet is finite, e -I’ II must be integrated over M, with analytic results. It is only in the thermodynamic limit V + x that the average of em’. ” is constructed by minimizing F with respect to M. and the nonanalyticity of Eqn. (4) occurs. The Landau theory has the same physical motiv ...
Numerical Renormalization Group Calculations for Impurity
... We start to giving the definitions of the scaling limit and universality from the viewpoint of classical phase transitions with an example of the one dimensional Ising model and introduce universal functions that represent the physics in the vicinity of the critical points as a function of two large ...
... We start to giving the definitions of the scaling limit and universality from the viewpoint of classical phase transitions with an example of the one dimensional Ising model and introduce universal functions that represent the physics in the vicinity of the critical points as a function of two large ...
Preprint
... has the universal fixed point property if it has the fixed point property with respect to all topological spaces T . Clearly, the universal fixed point property implies the homotopy fixed point property, which implies the fixed point property. It is therefore a strong condition for a topological spa ...
... has the universal fixed point property if it has the fixed point property with respect to all topological spaces T . Clearly, the universal fixed point property implies the homotopy fixed point property, which implies the fixed point property. It is therefore a strong condition for a topological spa ...
Homotopies and the universal fixed point property arXiv:1210.6496v3
... has the universal fixed point property if it has the fixed point property with respect to all topological spaces T . Clearly, the universal fixed point property implies the homotopy fixed point property, which implies the fixed point property. It is therefore a strong condition for a topological spa ...
... has the universal fixed point property if it has the fixed point property with respect to all topological spaces T . Clearly, the universal fixed point property implies the homotopy fixed point property, which implies the fixed point property. It is therefore a strong condition for a topological spa ...
Effective Field Theories
... can tell nothing about what is happening. It took about 20 years to solve this problem. The solution is given by the so called renormalization procedure. The basic idea of renormalization is of redefining free parameters of the theory i.e. the mass, charge or coupling constant such that the divergen ...
... can tell nothing about what is happening. It took about 20 years to solve this problem. The solution is given by the so called renormalization procedure. The basic idea of renormalization is of redefining free parameters of the theory i.e. the mass, charge or coupling constant such that the divergen ...
Equivariant asymptotic dimension, Damian Sawicki, praca magisterska
... Assumption 1.4, [4]. The first of this articles proves finiteness of equivariant asymptotic dimension for hyperbolic groups in order for the other to derive the Farrell–Jones conjecture. A similar, yet weaker property, “transfer reducibility” was justified for other classes of groups in subsequent w ...
... Assumption 1.4, [4]. The first of this articles proves finiteness of equivariant asymptotic dimension for hyperbolic groups in order for the other to derive the Farrell–Jones conjecture. A similar, yet weaker property, “transfer reducibility” was justified for other classes of groups in subsequent w ...
Gravity in lower dimensions
... Attempt 4: Poincare gauge theory and higher power curvature theories Basic idea: since EH is trivial consider f (R) theories or/and theories with torsion or/and theories with non-metricity I Example: Katanaev-Volovich model (Poincare gauge theory) Z ...
... Attempt 4: Poincare gauge theory and higher power curvature theories Basic idea: since EH is trivial consider f (R) theories or/and theories with torsion or/and theories with non-metricity I Example: Katanaev-Volovich model (Poincare gauge theory) Z ...
Renormalisation of Noncommutative Quantum Field Theory
... attempts to formulate a quantum theory of gravity have not yet been fully successful. It is astonishing that the two pillars of modern physics, quantum field theory and general relativity, seem incompatible. This convinced physicists to look for more general descriptions: After the formulation of su ...
... attempts to formulate a quantum theory of gravity have not yet been fully successful. It is astonishing that the two pillars of modern physics, quantum field theory and general relativity, seem incompatible. This convinced physicists to look for more general descriptions: After the formulation of su ...
Introduction to Group Field Theory
... GFT can be understood as a version of LQG with: no embedding in a continuous manifold; organization of LQG states in ’space atoms’; ...
... GFT can be understood as a version of LQG with: no embedding in a continuous manifold; organization of LQG states in ’space atoms’; ...
Effective Field Theories in Cosmology - SUrface
... structures we observe in the universe [9, 10] and could have been determined during a period of accelerated expansion known as inflation which took place at energy scales as high as ρ1/4 ∼ 1016 GeV. Thus, primordial perturbations offer a unique opportunity to test energy scales that would otherwise ...
... structures we observe in the universe [9, 10] and could have been determined during a period of accelerated expansion known as inflation which took place at energy scales as high as ρ1/4 ∼ 1016 GeV. Thus, primordial perturbations offer a unique opportunity to test energy scales that would otherwise ...
Theoretical and observational consistency of Massive Gravity
... categories of the theoretical proposals for dark energy that have been considered in the literature and very soon concentrate on massive gravity as an alternative to dark energy in chapter 2. We will discuss the recently developed ghost-free nonlinear theory for massive spin2 fields, the de Rham-Gab ...
... categories of the theoretical proposals for dark energy that have been considered in the literature and very soon concentrate on massive gravity as an alternative to dark energy in chapter 2. We will discuss the recently developed ghost-free nonlinear theory for massive spin2 fields, the de Rham-Gab ...
Quantum Gravity : Has Spacetime Quantum - Philsci
... the background is in fact chosen to be flat, one can use the Casimir operators of the Poincaré group and show that the quanta have spin two and rest mass zero. [...] Thus, in this program, quantum general relativity was first reduced to a quantum field theory in Minkowski space." (Ashtekar (2005) 5) ...
... the background is in fact chosen to be flat, one can use the Casimir operators of the Poincaré group and show that the quanta have spin two and rest mass zero. [...] Thus, in this program, quantum general relativity was first reduced to a quantum field theory in Minkowski space." (Ashtekar (2005) 5) ...
Quantum Gravity : Motivations and Alternatives 1
... Quantum Mechanics –, together with the already existing empirical data that confirmed these theories, are still the only concrete elements that constitute a reasonable starting point for the different attempts to construct a theory of Quantum Gravity, intended to get over their mutual conceptual inc ...
... Quantum Mechanics –, together with the already existing empirical data that confirmed these theories, are still the only concrete elements that constitute a reasonable starting point for the different attempts to construct a theory of Quantum Gravity, intended to get over their mutual conceptual inc ...
Lattice Hadron Physics Initiative
... coordinate the result is 10-d (IIA) string theory. The local radius of the 11th dimension, R11(r) = rR11/R ,determines local (warped) string parameters ...
... coordinate the result is 10-d (IIA) string theory. The local radius of the 11th dimension, R11(r) = rR11/R ,determines local (warped) string parameters ...
Breakdown of the Standard Model
... in clean systems, and for d>0 in disordered ones. ■ Landau free energy density: f = f0 – h m + t m2 + u m4 + w m6 Equation of state: h = t m + u m3 + w m5 + … ■ Landau theory predicts: ● 2nd order transition at t=0 if u<0 ● 1st order transition if u<0 ...
... in clean systems, and for d>0 in disordered ones. ■ Landau free energy density: f = f0 – h m + t m2 + u m4 + w m6 Equation of state: h = t m + u m3 + w m5 + … ■ Landau theory predicts: ● 2nd order transition at t=0 if u<0 ● 1st order transition if u<0 ...
Thesis - Archive ouverte UNIGE
... 3.1 Action for khronometric theory at low energies 3.2 Equations of motion in the far-zone . . . . . . . 3.2.1 Wave equations . . . . . . . . . . . . . . 3.3 Post-Newtonian expressions . . . . . . . . . . . 3.4 The source: conservation properties . . . . . . . ...
... 3.1 Action for khronometric theory at low energies 3.2 Equations of motion in the far-zone . . . . . . . 3.2.1 Wave equations . . . . . . . . . . . . . . 3.3 Post-Newtonian expressions . . . . . . . . . . . 3.4 The source: conservation properties . . . . . . . ...
Functional Determinants in Quantum Field Theory
... actions. Consider e.g. the operator M = m2 − D are integrated out in some gauge field background. Using (3.2), the log determinant can be expressed in terms of the heat kernel trace of M as ...
... actions. Consider e.g. the operator M = m2 − D are integrated out in some gauge field background. Using (3.2), the log determinant can be expressed in terms of the heat kernel trace of M as ...
Vladimirov A.A., Diakonov D. Diffeomorphism
... space by (d + 1)-cells or simplices, although the number of edges entering one vertex may not be the same for all vertices. Alternatively, the number of edges coming from all vertices is the same but then the edges lengths may vary, if one attempts to embed the lattice into at space. Since only the ...
... space by (d + 1)-cells or simplices, although the number of edges entering one vertex may not be the same for all vertices. Alternatively, the number of edges coming from all vertices is the same but then the edges lengths may vary, if one attempts to embed the lattice into at space. Since only the ...
theoretical physics in the Netherlands
... • Two themes: 1. Quantum Field Theory and Elementary Particles ...
... • Two themes: 1. Quantum Field Theory and Elementary Particles ...
Universal formalism of Fano resonance
... the identification of Ω0 can be somewhat arbitrary, practically, when an eigenstate is well separated from others and the corresponding eigenvalue has a small imaginary part, i.e., γα < Eα+1 − Eα and γα < Eα − Eα−1, it will result in a transmission resonance by itself with energy scale γα , as shown ...
... the identification of Ω0 can be somewhat arbitrary, practically, when an eigenstate is well separated from others and the corresponding eigenvalue has a small imaginary part, i.e., γα < Eα+1 − Eα and γα < Eα − Eα−1, it will result in a transmission resonance by itself with energy scale γα , as shown ...