Search results for "Reno"
showing 10 items of 1031 documents
Fully coupled functional equations for the quark sector of QCD
2021
We present a comprehensive study of the quark sector of $2+1$ flavour QCD, based on a self-consistent treatment of the coupled system of Schwinger-Dyson equations for the quark propagator and the full quark-gluon vertex. The individual form factors of the quark-gluon vertex are expressed in a special tensor basis obtained from a set of gauge-invariant operators. The sole external ingredient used as input to our equations is the Landau gauge gluon propagator with $2+1$ dynamical quark flavours, obtained from studies with Schwinger-Dyson equations, the functional renormalisation group approach, and large volume lattice simulations. The appropriate renormalisation procedure required in order t…
Renormalization group analysis of the gluon mass equation
2014
In the present work we carry out a systematic study of the renormalization properties of the integral equation that determines the momentum evolution of the effective gluon mass. A detailed, all-order analysis of the complete kernel appearing in this particular equation reveals that the renormalization procedure may be accomplished through the sole use of ingredients known from the standard perturbative treatment of the theory, with no additional assumptions. However, the subtle interplay of terms operating at the level of the exact equation gets distorted by the approximations usually employed when evaluating the aforementioned kernel. This fact is reflected in the form of the obtained sol…
Critical reflections on asymptotically safe gravity
2020
Asymptotic safety is a theoretical proposal for the ultraviolet completion of quantum field theories, in particular for quantum gravity. Significant progress on this program has led to a first characterization of the Reuter fixed point. Further advancement in our understanding of the nature of quantum spacetime requires addressing a number of open questions and challenges. Here, we aim at providing a critical reflection on the state of the art in the asymptotic safety program, specifying and elaborating on open questions of both technical and conceptual nature. We also point out systematic pathways, in various stages of practical implementation, towards answering them. Finally, we also take…
Adiabatic expansions for Dirac fields, renormalization, and anomalies
2018
11 pags.
Running Immirzi Parameter and Asymptotic Safety
2011
We explore the renormalization group (RG) properties of quantum gravity, using the vielbein and the spin connection as the fundamental field variables. We require the effective action to be invariant under the semidirect product of spacetime diffeomorphisms and local frame rotations. Starting from the corresponding functional integral we review the construction of an appropriate theory space and an exact funtional RG equation operating on it. We then solve this equation on a truncated space defined by a three parameter family of Holst-type actions which involve a running Immirzi parameter. We find evidence for the existence of an asymptotically safe fundamental theory. It is probably inequi…
Method to compute the stress-energy tensor for a quantized scalar field when a black hole forms from the collapse of a null shell
2020
A method is given to compute the stress-energy tensor for a massless minimally coupled scalar field in a spacetime where a black hole forms from the collapse of a spherically symmetric null shell in four dimensions. Part of the method involves matching the modes for the in vacuum state to a complete set of modes in Schwarzschild spacetime. The other part involves subtracting from the unrenormalized expression for the stress-energy tensor when the field is in the in vacuum state, the corresponding expression when the field is in the Unruh state and adding to this the renormalized stress-energy tensor for the field in the Unruh state. The method is shown to work in the two-dimensional case wh…
�ber die Wirkung von Adrenochrom und Histamin auf die Blutungszeit
1952
Adrenochrom (ACHR) und das Semicarbazon des Adrenochrom = Adrenoxyl verkurzen die Blutungszeit beim Kaninchen. Die Wirkung last sich durch Antihistaminica aufheben bzw. verhindern. Auch die Wirkung von Histamin, das in analoger Weise wie ACHR die Blutungszeit verkurzt, last sich durch vorherige Gabe eines Antihistaminicum verhindern. Die bereits eingetretene Wirkung von Histamin last sich durch Antihistaminiea nicht mehr aufheben. Die Ergebnisse werden ausfuhrlich im Arch. exper. Path. u. Pharmakol. veroffentlicht.
Isoproterenol inhibits fluid-phase endocytosis from early to late endosomes
1999
We have shown recently that isoproterenol affects both the cellular location and the morphology of late endosomes in a pH-dependent manner [Marjomäki et al., Eur. J. Cell Biol. 65, 1-13 (1994)]. In this study, using fluorescence and quantitative electron microscopy, we wanted to examine further what is the fate of internalized markers during their translocation from early to late endosomes under isoproterenol treatment. Fluorescein dextran internalized for 30 min (10-min pulse followed by a 20-min chase) showed accumulation in the cellular periphery during isoproterenol treatment in contrast to the control cells, which accumulated dextran in the perinuclear region. Quantitative electron mic…
Los edificios universitarios de Fernando Moreno Barberá en el campus de Blasco Ibáñez de Valencia: nuevas aportaciones a su cronología y construcción
2018
Este artículo estudia el conjunto de edificios construidos por el arquitecto Fernando Moreno Barberá en el campus universitario de Blasco Ibáñez de Valencia, cuyos proyectos se redactaron entre el final de los años cincuenta y primeros sesenta del siglo XX. Este artículo se ha elaborado a partir del estudio de las fuentes originales, sobre todo de las actas de las sesiones celebradas por la Junta de Obras de la Universidad de Valencia; se trata de documentos inéditos que describen con exactitud el proceso constructivo de este espacio tan singular.
No egļu skujām iegūto poliprenolu nozīme atorvastatīna izraisītu muskuļu darbības traucējumu novēršanā žurkām
2015
Statīni, kā seruma lipīdus reducējoši līdzekļi, spēj mazināt koronāro un cerebrovaskulāro slimību progresiju. Statīni, inhibējot HMG-CoA reduktāzi, samazina holesterīna un arī poliprenolu līmeni, kas varētu veicināt muskuļu sāpju, miopātijas un rabdomiolīzes attīstību. Darba mērķis ir novērtēt no egļu skujām izdalīto poliprenolu, atorvastatīna, šo vielu kombinācijas efektus dažādos ar motoro funkciju analizējošos farmakoloģiskos testos. Darba rezultāti rāda, ka satvēriena spēka un trakcijas testā atorvastatīns 80 mg/kg samazināja žurku muskuļu spēku. Satvēriena testā poliprenoli 20 mg/kg un trakcijas testā poliprenoli 1,10,20 mg/kg protektēja atorvastatīna izraisīto muskuļu spēka samazināju…