Zobrazeno 1 - 10
of 719
pro vyhledávání: '"SHAPIRO, ILYA"'
Autor:
Buchbinder, Ioseph L., Vale, Públio Rwany B. R. do, Oyadomari, Guilherme Y., Shapiro, Ilya L.
We consider the renormalization of massive vector field interacting with charged scalar field in curved spacetime. Starting with the theory minimally coupled to external gravity and using the formulations with and without St\"uckelberg fields, we sho
Externí odkaz:
http://arxiv.org/abs/2410.00991
One of the remarkable differences between renormalizable quantum gravity with four-derivative action and its superrenormalizable polynomial generalizations is that the latter admit a more sophisticated particle mass spectrum. Already in the simplest
Externí odkaz:
http://arxiv.org/abs/2408.16514
Autor:
Silva, Wagno Cesar e, Shapiro, Ilya L.
Publikováno v:
Phys. Rev. D 110 (2024) 043540
We explore the possibility of avoiding cosmological singularity with a bounce solution in the early Universe. The main finding is that simple and well-known semiclassical correction, which describes the mixing of radiation and gravity in the effectiv
Externí odkaz:
http://arxiv.org/abs/2402.18785
We explore the possibility of a consistent cosmology based on the gauge-fixing independent running of the gravitational and cosmological constants ($G$ and $\Lambda$) in the framework of effective quantum gravity. In particular, their running in this
Externí odkaz:
http://arxiv.org/abs/2401.11559
The simplest anisotropic model of the early Universe is the one with two conformal factors, which can be identified as Kantowski-Sachs metric, or the reduced version of the Bianchi-I metric. To fit the existing observational data, it is important tha
Externí odkaz:
http://arxiv.org/abs/2312.04723
Autor:
Shapiro, Ilya L.
The conformal version of the antisymmetric second-order tensor field in four spacetime dimensions does not have gauge invariance extensively discussed in the literature for more than half a century. Our first observation is that, when coupled to ferm
Externí odkaz:
http://arxiv.org/abs/2310.04131
Autor:
Barvinsky, Andrei O., Camargo, Guilherme H. S., Kalugin, Alexei E., Ohta, Nobuyoshi, Shapiro, Ilya L.
The finite local conformally non-invariant $R^2$-term emerges in the one-loop effective action of the model of quantum gravity based on the Weyl-squared classical action. This term is related to the $\Box R$ contribution to the conformal anomaly, whi
Externí odkaz:
http://arxiv.org/abs/2308.05251
Autor:
Shapiro, Ilya
Considering the monoidal category $\mathcal{C}$ obtained as modules over a Hopf algebra $H$ in a rigid braided category $\mathcal{B}$, we prove decomposition results for the Hochschild and cyclic homology categories $HH(\mathcal{C})$ and $HC(\mathcal
Externí odkaz:
http://arxiv.org/abs/2305.07739
Autor:
Silva, Wagno Cesar e, Shapiro, Ilya L.
Publikováno v:
J. High Energ. Phys. 2023 (2023) 97
We explore the decoupling of massive ghost mode in the $4D$ (four-dimensional) theory of the conformal factor of the metric. The model was introduced by Antoniadis and Mottola in [1] and can be regarded as a close analog of the fourth-derivative quan
Externí odkaz:
http://arxiv.org/abs/2301.13291