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381.
Victor I. Afonso Gonzalo J. Olmo Emanuele Orazi Diego Rubiera-Garcia 《The European Physical Journal C - Particles and Fields》2018,78(10):866
We show that families of nonlinear gravity theories formulated in a metric-affine approach and coupled to a nonlinear theory of electrodynamics can be mapped into general relativity (GR) coupled to another nonlinear theory of electrodynamics. This allows to generate solutions of the former from those of the latter using purely algebraic transformations. This correspondence is explicitly illustrated with the Eddington-inspired Born–Infeld theory of gravity, for which we consider a family of nonlinear electrodynamics and show that, under the map, preserve their algebraic structure. For the particular case of Maxwell electrodynamics coupled to Born–Infeld gravity we find, via this correspondence, a Born–Infeld-type nonlinear electrodynamics on the GR side. Solving the spherically symmetric electrovacuum case for the latter, we show how the map provides directly the right solutions for the former. This procedure opens a new door to explore astrophysical and cosmological scenarios in nonlinear gravity theories by exploiting the full power of the analytical and numerical methods developed within the framework of GR. 相似文献
382.
The LIGO/Virgo detections of binary black hole mergers marked a watershed moment in astronomy, ushering in the era of precision tests of Kerr dynamics. We review theoretical and experimental challenges that must be overcome to carry out black hole spectroscopy with present and future gravitational wave detectors. Among other topics, we discuss quasinormal mode excitation in binary mergers, astrophysical event rates, tests of black hole dynamics in modified theories of gravity, parameterized “post-Kerr” ringdown tests, exotic compact objects, and proposed data analysis methods to improve spectroscopic tests of Kerr dynamics by stacking multiple events. 相似文献
383.
Emanuele F. Pissinati José A. C. Delgado Pedro A. M. Moro Dr. José T. M. Correia Prof. Dr. Roberto G. S. Berlinck Prof. Dr. Márcio W. Paixão 《European journal of organic chemistry》2023,26(21):e202300274
A site-selective carbamoylation strategy to access non-proteinogenic N4-modified asparagines has been described. The protocol is characterized by mild reaction conditions, high functional group compatibility, and a wide diversity of functionalized carbamoyl radicals making possible the access to peptides, pharmaceuticals, and natural N4-asparagine conjugates, as well as enantioenriched unnatural N4-asparagines. Besides that, deuterated analogues were achieved with the insertion of D2O and enantioenriched derivatives could be obtained in 15 min in continuous-flow conditions. 相似文献
384.
Fabio Ganazzoli Giuseppe Allegra Emanuele Colombo Mario De Vitis 《Macromolecular theory and simulations》1992,1(5):299-310
The configurational, or elastic, free energy Ael of a polymer chain is discussed in terms of the Fourier configurational approach. The importance of accounting for all degrees of freedom of the chain is shown in comparison with affine mean-field theories and with scaling theories of chain expansion and contraction. In case of strong contraction the chain does show neither affinity nor self-similarity, and we get Ael ∼ N1/3, N being the number of chain bonds. Conversely, in case of good-solvent expansion we find Ael ∼ N. The same result holds in the vicinity of the Θ-temperature, where Ael is also proportional to [(T − Θ)/T]2. 相似文献