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Davide Rindori (University of Florence and INFN)09/09/2019, 11:15
We evaluate the thermal expectation values in a free quantum field theory at global thermodynamic equilibrium with acceleration in Minkowski space- time. It is found that Unruh temperature TU = A/2π is an absolute lower bound for the comoving temperature along the hyperbolic flow lines. We also present a method to determine the entropy current, and we find that at the Unruh temperature the...
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Fiorenzo Bastianelli (BO)09/09/2019, 12:00
We discuss chiral fermions in gauge (and gravitational) backgrounds,
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and focus on the structure of their trace anomalies.
We regulate the quantum theory with Pauli-Villars fields
and do not find party-odd terms in the trace anomalies.
The latter have been the object of recent analyses. -
Yuko Urakawa (Bielefeld University)09/09/2019, 14:15
In various cosmological models, the curvature perturbation $\zeta$ has a constant solution in the infrared (IR) limit and $\zeta$ fulfills the soft theorem, a.k.a, the consistency relation. However, it has not been very clear what ensures these properties. We show the existence of the constant solution and the soft theorem, assuming the asymptotically FLRW geometry and the invariance under the...
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Denis Comelli (FE)09/09/2019, 15:00
An effective field theory lagrangian formalism of four scalar DoF allows to describe both self gravitating non dissipative fluids and generic massive gravity models as identical systems. We elaborate on the stability of massive gravity models with six DoF and on the behaviour of cosmological perturbations.
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Marco Piva (Penn State University)09/09/2019, 16:30
In this talk I will expose the features of a new local higher-derivative theory of quantum gravity. The model is based on the concept of “fakeons” or “fake degrees of freedom”, which solves the problem of ghosts and leads to a unitary, renormalizable theory. In particular, I will show the absorptive part of the graviton self-energy at one loop and its contributions to the effective action,...
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Damiano Anselmi (PI)09/09/2019, 17:15
Under certain assumptions, it is possible to make sense of higher derivative theories by quantizing the unwanted degrees of freedom as fakeons, which are later projected away. Then the true classical limit is obtained by classicizing the quantum theory. Since quantum field theory is formulated perturbatively, the classicization is also perturbative. After deriving a number of properties in a...
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Maurizio Muratori (Università di Modena e Reggio Emilia)10/09/2019, 09:00
Numerical Worldline MonteCarlo techniques in flat spacetime have been deeply developed in order to extract physical information from QFT systems. We study a possible way to extend such procedures to the case of (Euclidean) curved spaces, where the proper-time discretization of a bosonic worldline point-particle is treated similarly to a time-slicing regularization for the associated quantum...
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Massimiliano Rinaldi (TIFP)10/09/2019, 09:45
In this talk we discuss the possibility that tensor-scalar gravity is naturally scale-invariant, at least at the classical level. This assumption has a number of phenomenological consequences on the physics of the Universe at large scale and of black holes. We consider some of these to assess whether scale-invariance is a viable and fundamental symmetry.
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Pietro Grassi (Universita' del Piemonte Orientale)10/09/2019, 11:15
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Kenichi Konishi (Univ. Pisa and INFN, Pisa)10/09/2019, 12:00
Consequence of gauging 1-form discrete center symmetries are studied in some simple SU(N) gauge theories. In particular, we discuss how the dynamics of strongly coupled chiral gauge theories is constrained by the mixed anomalies involving the new, 1-form symmetries and conventional 0-form symmetries.
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Gianluca Grignani (PG)10/09/2019, 14:15
Despite their potential importance for understanding astrophysical jets, physically realistic exact solutions for magnetospheres around Kerr black holes have not been found, even in the force-free approximation. Instead, approximate analytical solutions such as the perturbative solution in the spin parameter proposed by Blandford and Znajek, as well as numerical solutions, have been...
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Emanuele Latini (University of Bologna and INFN Bologna)10/09/2019, 15:00
We will show how quantization together with quantum dynamics can be simultaneously formulated as the problem of finding an appropriate flat connection (named contact connection) on a Hilbert bundle over a contact manifold. In this setting we will discuss the local, formal gauge equivalence for a broad class of quantum dynamical systems; just as classical dynamics depends on choices of clocks,...
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Stefano Giaccari (Holon Institute of Technology)10/09/2019, 16:30
Using the effective action method, we investigate the higher spin actions in flat spacetime that can be obtained by integrating out a fermion field coupled to external higher spin source fields. In particular, an approach based on worldline quantization allows to identify the gauge symmetry of these models and to find the L_infinity structure that characterizes many (classical) field theories,...
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Roberto Bonezzi (Humboldt University Berlin)10/09/2019, 17:15
In this talk I will present the first-quantized description of Einstein gravity in terms of a point particle model with N=4 local worldline supersymmetries. In particular, I will discuss how the quantum consistency of the underlying first-quantized system produces fully nonlinear Einstein field equations for the target space metric, thus showing that this is not a peculiarity of string...
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