Zobrazeno 1 - 10
of 24
pro vyhledávání: '"F. D. Mazzitelli"'
Publikováno v:
Physical Review
Physical Review D 106(2022), 105022
Physical Review D 106(2022), 105022
We consider local semitransparent Neumann boundary conditions for a quantum scalar field as imposed by a quadratic coupling to a source localized on a flat codimension-one surface. Upon a proper regularization to give meaning to the interaction, we i
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https://explore.openaire.eu/search/publication?articleId=doi_dedup___::083c8f1d02f37c587583844277362289
http://repo.scoap3.org/api
http://repo.scoap3.org/api
Publikováno v:
Physical Review
We discuss several aspects of the stress-energy tensor for a quantum scalar field in an inhomogeneous background, the latter being modeled by a variable mass. Using a perturbative approach, dimensional regularization and adiabatic subtraction, we pre
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a3423c26a38a9dddb38efbbab84da84c
http://arxiv.org/abs/2110.14692
http://arxiv.org/abs/2110.14692
Publikováno v:
CONICET Digital (CONICET)
Consejo Nacional de Investigaciones Científicas y Técnicas
instacron:CONICET
Consejo Nacional de Investigaciones Científicas y Técnicas
instacron:CONICET
We compute the gravitational effective action by integrating out quantum matter fields in a weak gravitational field, using the Schwinger-Keldysh (in-in) formalism. We pay particular attention to the role of the initial quantum state in the structure
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https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ea3ce5ba4c9119b46583176ea0596be8
Publikováno v:
CONICET Digital (CONICET)
Consejo Nacional de Investigaciones Científicas y Técnicas
instacron:CONICET
Consejo Nacional de Investigaciones Científicas y Técnicas
instacron:CONICET
We discuss area terms in entanglement entropy and show that a recent formula by Rosenhaus and Smolkin is equivalent to the term involving a correlator of traces of the stress tensor in Adler-Zee formula for the renormalization of the Newton constant.
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https://doi.org/10.1103/physrevd.91.104035
https://doi.org/10.1103/physrevd.91.104035
Publikováno v:
Classical and Quantum Gravity. 10:2495-2504
The problem of decoherence in quantum gravity is discussed in the framework of third quantization. We propose an interpretation of the theory in which the probabilities in our observable universe have to be calculated with the use of the one-universe
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https://doi.org/10.1088/0264-9381/10/12/008
https://doi.org/10.1088/0264-9381/10/12/008
Autor:
F. D. Mazzitelli, Noureddine Mohammedi
Publikováno v:
Nuclear Physics B. 401:239-256
We consider the two dimensional Jackiw-Teitelboim model of gravity. We first couple the model to the Liouville action and $c$ scalar fields and show, treating the combined system as a non linear sigma model, that the resulting theory can be interpret
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https://explore.openaire.eu/search/publication?articleId=doi_dedup___::428f34b0f74b320471087c6e1af89c01
https://doi.org/10.1016/0550-3213(93)90304-8
https://doi.org/10.1016/0550-3213(93)90304-8
Autor:
F. D. Mazzitelli
Publikováno v:
Physical Review D. 45:2814-2822
In the framework of the canonical quantization of general relativity, quantum field theory on a fixed background formally arises in an expansion in powers of the Planck length. In order to renormalize the theory, quadratic terms in the curvature must
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::52d44beaa0151b41e8579fd84f7cab44
https://doi.org/10.1103/physrevd.45.2814
https://doi.org/10.1103/physrevd.45.2814
Autor:
Noureddine Mohammedi, F. D. Mazzitelli
Publikováno v:
Physics Letters B. 268:12-16
A generalised action for two-dimensional quantum gravity is considered. This includes, in addition to the Einstein-Hilbert action near two dimensions, a term imposing the constancy of the scalar curvature R . The propagators have no poles in ϵ ( d =
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https://explore.openaire.eu/search/publication?articleId=doi_________::3d53538b6fe4149007a140b9a5df1464
https://doi.org/10.1016/0370-2693(91)90914-c
https://doi.org/10.1016/0370-2693(91)90914-c
Autor:
Diego Harari, F. D. Mazzitelli
Publikováno v:
Physics Letters B. 266:269-274
A global cosmic string may couple to electromagnetism as a consequence of anomalous triangle diagrams. In an external magnetic field, the gradients of the Nambu-Goldstone boson around the string give rise to an extended polarization current. When the
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https://explore.openaire.eu/search/publication?articleId=doi_________::8884539afeb2ff288467c673d81d9fb8
https://doi.org/10.1016/0370-2693(91)91038-w
https://doi.org/10.1016/0370-2693(91)91038-w
Finite expressions for the mean value of the stress tensor corresponding to a scalar field with a generalized dispersion relation in a Friedman--Robertson--Walker universe are obtained using adiabatic renormalization. Formally divergent integrals are
Externí odkaz:
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