Massive Case Research Articles

The influence of a weak magnetic field in the Renormalization-Group functions of (2 + 1)-dimensional Dirac systems

The experimental observation of the renormalization of the Fermi velocity $v_{F}$ as a function of doping has been a landmark for confirming the importance of electronic interactions in graphene. Although the experiments were performed in the presence of a perpendicular magnetic field $B$, the measurements are well described by a renormalization-group (RG) theory that did not include it. Here we clarify this issue, for both massive and massless Dirac systems, and show that for the weak magnetic fields at which the experiments are performed, there is no change in the renormalization-group functions. Our calculations are carried out in the framework of the Pseudo-quantum electrodynamics (PQED) formalism, which accounts for dynamical interactions. We include only the linear dependence in $B$, and solve the problem using two different parametrizations, the Feynman and the Schwinger one. We confirm the results obtained earlier within the RG procedure and show that, within linear order in the magnetic field, the only contribution to the renormalization of the Fermi velocity arises due to interactions. In addition, for gapped systems, we observe a running of the mass parameter.

Analytic results for the Tsallis thermodynamic variables

We analytically investigate the thermodynamic variables of a hot and dense system, in the framework of the Tsallis non-extensive classical statistics. After a brief review, we start by recalling the corresponding massless limits for all the thermodynamic variables. We then present the detail of calculation for the exact massive result regarding the pressure -- valid for all values of the $q$-parameter -- as well as the Tsallis $T$-, $\mu$- and $m$- parameters, the former characterizing the non-extensivity of the system. The results for other thermodynamic variables, in the massive case, readily follow from appropriate differentiations of the pressure, for which we provide the necessary formulas. For the convenience of the reader, we tabulate all of our results. A special emphasis is put on the method used in order to perform these computations, which happens to reduce cumbersome momentum integrals into simpler ones. Numerical consistency between our analytic results and the corresponding usual numerical integrals are found to be perfectly consistent. Finally, it should be noted that our findings substantially simplify calculations within the Tsallis framework. The latter being extensively used in various different fields of science as for example, but not limited to, high-energy nucleus collisions, we hope to enlighten a number of possible applications.

The strain effect on the Dirac electrons tunneling through the time-periodic scalar and vector barriers

The tunneling of the massless and massive Dirac particle through the strained barriers driven by the time-periodic scalar potentials and the static vector potentials is investigated, where the interrelationships among the strain, the incidence angle, the dynamic scalar potential, the magnetic field and the transmission of the Dirac particle have been discussed. In either massless or massive case, the intersection angle between the obliquely incident Dirac particle and strain determines the extent of deviation of the tunneling profiles from the strainless case. The time-periodic scalar potentials can enhance the capability of the Dirac particle to surmount the energy gap induced by the mass, reflecting quantum nature of the photon-assisted tunneling. When the magnetic field is switched on, the transmission overall presents a remarkably different profile, and decreases with the increase of the magnetic fields due to the conservation of the transverse momentum, which reduces the number of the side-band channels for tunneling.

Regularization-scheme dependence of QCD amplitudes in the massive case

We investigate QCD amplitudes with massive quarks computed in the four-dimensional helicity scheme (FDH) and dimensional reduction at NNLO and describe how they are related to the corresponding amplitudes computed in conventional dimensional regularization. To this end, the scheme dependence of the heavy quark and the velocity-dependent cusp anomalous dimensions is determined using soft-collinear effective theory. The results are checked against explicit computations of massive form factors in FDH at NNLO. Our results complete the description of the scheme dependence of QCD amplitudes at NNLO.

Conjugate variables in quantum field theory and a refinement of Pauli’s theorem

For the case of spin zero we construct conjugate pairs of operators on Fock space. On states multiplied by polarization vectors coordinate operators Q conjugate to the momentum operator P exist. The massive case is derived from a geometrical quantity, the massless case is realized by taking the limit mass going to zero on the one hand, on the other from conformal transformations. Crucial is the norm problem of the states on which the Q's act: they determine eventually how many independent conjugate pairs exist. It is intriguing that light wedge variables and hence the wedge-local case seems to be preferred.

Failure of Therapy at Premortem Diagnosed Pulmonary Thromboembolism

Objectives: We analyzed patients diagnosed premortem with pulmonary thromboembolism (PTE), focusing on causes of failure of therapy together with clinical characteristics. Methods: This was a retrospective study of 25 cases. We classified PTE as massive, submassive and nonmassive. Results: Of the 25 cases, 76% (19/25) had two or more risk factors for PTE. The point of origin of PE could be determined in only 44% of 25 cases. In 20 % (5/25) of cases diagnosed with PTE a maximum 3 months prior to death, the main cause of death was unknown. Of 10/20 (50%) massive and 8/20 (40%) submassive PTE cases, 5 and 3 underwent thrombolysis therapy, respectively. Both of 2/20 (10%) non-massive PTE cases underwent LMWH; in 1 of these cases, autopsy showed thrombus of a large pulmonary artery at 25 days after therapy. Submassive PTE cases were older and had a greater number of risk factors than did massive PTE cases. The point of origin of PTE was a right heart thrombus in six (24%) cases. Surgeries were performed in 3/6 (50 %) cases with right atrial thrombus. The survival duration after therapy in those who underwent surgery was longer than those who received thrombolysis and LMWH therapies. Conclusions: Physicians may provide appropriate information to patients who have certain risk factors (trauma, surgery, pregnancy, etc.) to predict acute PE at a preventable stage. If risk factors are present for a prolonged period, or if new risk factors for PTE are identified, patients should be followed up carefully because of the risk of progression of thrombosis.

Large N matrix models for 3d N $$ \mathcal{N} $$ = 2 theories: twisted index, free energy and black holes

We provide general formulae for the topologically twisted index of a general three-dimensional ${\cal N}\geq 2$ gauge theory with an M-theory or massive type IIA dual in the large $N$ limit. The index is defined as the supersymmetric path integral of the theory on $S^2\times S^1$ in the presence of background magnetic fluxes for the R- and global symmetries and it is conjectured to reproduce the entropy of magnetically charged static BPS AdS$_4$ black holes. For a class of theories with an M-theory dual, we show that the logarithm of the index scales indeed as $N^{3/2}$ (and $N^{5/3}$ in the massive type IIA case). We find an intriguing relation with the (apparently unrelated) large $N$ limit of the partition function on $S^3$. We also provide a universal formula for extracting the index from the large $N$ partition function on $S^3$ and its derivatives and point out its analogy with the attractor mechanism for AdS black holes.

Renormalization of massive Feynman amplitudes and homogeneity (based on a joint work with Raymond Stora)

We propose a new renormalization procedure to all orders in perturbation theory, which is formulated on an extended position space. This allows us to apply methods from massless Quantum Field Theory to models of massive fields. These include the technique of homogeneous and associate homogeneous distributions for the extension problem contained in the renormalization theory on position space. This also makes it possible to generalize the notion of residues of Feynman amplitudes, which characterize the presence of additional scales due to renormalization, to the massive case.

ОСОБЕННОСТИ ИНТЕНСИВНОЙ ОРГАНОСОХРАНЯЮЩЕЙ ТЕРАПИИ ПРИ ВЫРАЖЕННЫХ ПОСЛЕРОДОВЫХ КРОВОТЕЧЕНИЯХ

Bleeding in pregnancy, childbirth and the postpartum period is one of the leading causes of maternal morbidity and mortality worldwide. There is no doubt that obstetric bleeding demands the development of improved methods for its diagnostics and treatment. We assessed the effectiveness of the treatment strategy for massive postpartum hemorrhage (PPH) with preservation of reproductive function, applied in the Perinatal Center of Irkutsk. We performed a retrospective analysis of 24 delivery cases, complicated by massive bleeding and successfully treated with preservation of reproductive organs. The massive nature of bleeding (≥ 30 % of blood volume) was registered in 15 (62.5 %) cases, mild (≥ 20 % but ≤ 30 % of blood volume) – in 9 (37.5 %). Emergency operative delivery (cesarean section) was performed in 40 % of massive PPH cases and in 66.7 % of mild PPH cases. Uterotonic drugs were used in all PPH cases. When analyzing complex mechanical methods of PPH arrest, we noticed that in 20 % of cases balloon tamponade was used. In 33.3 % of mild PPH cases, balloon tamponade with great vessels ligation was performed. Thus, the most effective method was balloon tamponade coupled with Baksheev forceps and early surgical hemostasis. All in all, prevention of hemorrhage in risk groups and early fluid and surgical therapy, and also administration of uterotonic drugs in PPH treatment not only provide a hemostatic effect but also preserve reproductive function.

Chiral condensate in the Schwinger model with matrix product operators

Tensor network (TN) methods, in particular the matrix product states (MPS) ansatz, have proven to be a useful tool in analyzing the properties of lattice gauge theories. They allow for a very good precision, much better than standard Monte Carlo (MC) techniques for the models that have been studied so far, due to the possibility of reaching much smaller lattice spacings. The real reason for the interest in the TN approach, however, is its ability, shown so far in several condensed matter models, to deal with theories which exhibit the notorious sign problem in MC simulations. This makes it prospective for dealing with the nonzero chemical potential in QCD and other lattice gauge theories, as well as with real-time simulations. In this paper, using matrix product operators, we extend our analysis of the Schwinger model at zero temperature to show the feasibility of this approach also at finite temperature. This is an important step on the way to deal with the sign problem of QCD. We analyze in detail the chiral symmetry breaking in the massless and massive cases and show that the method works very well and gives good control over a broad range of temperatures, essentially from zero to infinite temperature.

Energy spectra of massive two-body decay products and mass measurement

We have recently established a new method for measuring the mass of unstable particles produced at hadron colliders based on the analysis of the energy distribution of a massless product from their two-body decays. The central ingredient of our proposal is the remarkable result that, for an unpolarized decaying particle, the location of the peak in the energy distribution of the observed decay product is identical to the (fixed) value of the energy that this particle would have in the rest-frame of the decaying particle, which, in turn, is a simple function of the involved masses. In addition, we utilized the property that this energy distribution is symmetric around the location of peak when energy is plotted on a logarithmic scale. The general strategy was demonstrated in several specific cases, including both beyond the standard model particles, as well as for the top quark. In the present work, we generalize this method to the case of a massive decay product from a two-body decay; this procedure is far from trivial because (in general) both the above-mentioned properties are no longer valid. Nonetheless, we propose a suitably modified parametrization of the energy distribution that was used successfully for the massless case, which can deal with the massive case as well. We test this parametrization on concrete examples of energy spectra of Z bosons from the decay of a heavier supersymmetric partner of top quark (stop) into a Z boson and a lighter stop. After establishing the accuracy of this parametrization, we study a realistic application for the same process, but now including dominant backgrounds and using foreseeable statistics at LHC14, in order to determine the performance of this method for an actual mass measurement. The upshot of our present and previous work is that, in spite of energy being a Lorentz-variant quantity, its distribution emerges as a powerful tool for mass measurement at hadron colliders.

Fetomaternal hemorrhage complicated pregnancy: risks, identification, and management.

This article aims not only to review recent literature about the clinical features of massive fetomaternal hemorrhage (FMH) and identification of risk factors, but also to alert obstetricians and pediatricians to this underdiagnosed and underestimated severe obstetrical issue. In addition, a simplified flow chart for the antenatal management of suspected FMH is proposed. Improvements in obstetrical and neonatal care have decreased perinatal morbidity and mortality and the rate of stillbirth. Unfortunately, because of the nonspecific signs on presentation, adverse outcome associated with massive FMH has not followed this trend and still has devastating consequences. As even the definition varies among publications and there is lack of universal screening, the real nature still remains obscure. Improvements in the diagnosis of fetal anemia, laboratory and intrauterine transfusion techniques, and the implementation of prenatal and postnatal neuroprotection give some hope for the better outcome in the most severe cases. Unfortunately, obstetricians' awareness of the massive FMH remains still at an unacceptably low level. There is an urgent need for the internationally accepted definition, standardized pregnancy management protocol, and structured follow-up of neonates from such pregnancies. We suggest the international registry of massive FMH cases.

Cosmological perturbations in coherent oscillating scalar field models

The fact that fast oscillating homogeneous scalar fields behave as perfect fluids in average and their intrinsic isotropy have made these models very fruitful in cosmology. In this work we will analyse the perturbations dynamics in these theories assuming general power law potentials $V(\phi)=\lambda \vert\phi\vert^{n}/n$. At leading order in the wavenumber expansion, a simple expression for the effective sound speed of perturbations is obtained $c_{\text{eff}}^2 = \omega=(n-2)/(n+2)$ with $\omega$ the effective equation of state. We also obtain the first order correction in $k^2/\omega_{\text{eff}}^2$, when the wavenumber $k$ of the perturbations is much smaller than the background oscillation frequency, $\omega_{\text{eff}}$. For the standard massive case we have also analysed general anharmonic contributions to the effective sound speed. These results are reached through a perturbed version of the generalized virial theorem and also studying the exact system both in the super-Hubble limit, deriving the natural ansatz for $\delta\phi$; and for sub-Hubble modes, exploiting Floquet's theorem.

Slum Kampong Tourism “Jakarta Hidden Tour”: Designing Eco-Cultural Based Pro-Poor Tourism

Forecasts of high tourism development in Jakarta, Indonesia, where massive poverty cases also exist, has directed tourism as a way of alleviating poverty; this is usually termed “pro-poor tourism” which involves multi variant stakeholders and interests. Jakarta has widespread poor areas called “slum Kampongs”, where government and business sectors are supported by international development agencies have tried to tackle down poverty by economy-community (eco-community) based development programs. However, distinguished from those programs, slum kampong development based pro-poor tourism is yet unsupported by bureaucracy agencies. “Jakarta Hidden Tour” (see “Jakarta Hidden Tour” in Trip Advisor) a “wild” tour activity which is promoted by community movement led by Ronny Poluan indicates a term of economy and cultural (eco-cultural) based slum kampong tourism that basically can pursue a better community development and economy condition through a unique culture and real life portrait experience. This paper analyses the dilemma of “Jakarta Hidden Tour” which is claimed as a poor exhibition while in another hand tries to offer a new design and approach of pro-poor tourism by utilizing thematic Kampong development with local culture excellences as such “Green Slum Kampong in Ciliwung river”, or “Sailor Slum Kampong in North Jakarta”. Key learn from Brazil with slum kampong tourism in Santa Marta is a motivation for government to live a recognition, that like any other global/industrial policies, tourism is highly driven by political interest. By conducting a system thinking perspective base, this paper analyses how “Jakarta Hidden Tour” and government’s supporting policy will ensure eco-cultural pro-poor tourism development and how stakeholders as a system’s element need to uphold poverty alleviation towards sustainability

Slum Kampong Tourism “Jakarta Hidden Tour”: Designing Eco-Cultural Based Pro-Poor Tourism

Forecasts of high tourism development in Jakarta, Indonesia, where massive poverty cases also exist, has directed tourism as a way of alleviating poverty; this is usually termed “pro-poor tourism” which involves multi variant stakeholders and interests. Jakarta has widespread poor areas called “slum Kampongs”, where government and business sectors are supported by international development agencies have tried to tackle down poverty by economy-community (eco-community) based development programs. However, distinguished from those programs, slum kampong development based pro-poor tourism is yet unsupported by bureaucracy agencies. “Jakarta Hidden Tour” (see “Jakarta Hidden Tour” in Trip Advisor) a “wild” tour activity which is promoted by community movement led by Ronny Poluan indicates a term of economy and cultural (eco-cultural) based slum kampong tourism that basically can pursue a better community development and economy condition through a unique culture and real life portrait experience. This paper analyses the dilemma of “Jakarta Hidden Tour” which is claimed as a poor exhibition while in another hand tries to offer a new design and approach of pro-poor tourism by utilizing thematic Kampong development with local culture excellences as such “Green Slum Kampong in Ciliwung river”, or “Sailor Slum Kampong in North Jakarta”. Key learn from Brazil with slum kampong tourism in Santa Marta is a motivation for government to live a recognition, that like any other global/industrial policies, tourism is highly driven by political interest. By conducting a system thinking perspective base, this paper analyses how “Jakarta Hidden Tour” and government’s supporting policy will ensure eco-cultural pro-poor tourism development and how stakeholders as a system’s element need to uphold poverty alleviation towards sustainability

Global Well-Posedness for the Massless Cubic Dirac Equation: Table 1

We show that the cubic Dirac equation with zero mass is globally well-posed for small data in the scale invariant space H^{\frac{n-1}{2}}(R^n) for n=2, 3. The proof proceeds by using the Fierz identities to rewrite the equation in a form where the null structure of the system is readily apparent. This null structure is then exploited via bilinear estimates in spaces based on the null frame spaces of Tataru. We hope that the spaces and estimates used here can be applied to other nonlinear Dirac equations in the scale invariant setting. Our work complements recent results of Bejenaru-Herr who proved a similar result for n=3 in the massive case.

Spinning particles in vacuum spacetimes of different curvature types: Natural reference tetrads and massless particles

In a previous paper, we considered the motion of massive spinning test particles in the ``pole-dipole'' approximation, as described by the Mathisson-Papapetrou-Dixon (MPD) equations and examined its properties in dependence on the spin supplementary condition. We decomposed the equations in the orthonormal tetrad based on the timelike vector fixing the spin condition and on the corresponding spin, while representing the curvature in terms of the Weyl scalars obtained in the Newman-Penrose null tetrad naturally associated with the orthonormal one; the projections thus obtained did not contain the Weyl scalars ${\mathrm{\ensuremath{\Psi}}}_{0}$ and ${\mathrm{\ensuremath{\Psi}}}_{4}$. In the present paper, we choose the interpretation tetrad in a different way, attaching it to the tangent ${u}^{\ensuremath{\mu}}$ of the worldline representing the history of the spinning body. Actually two tetrads are suggested, both given ``intrinsically'' by the problem and each of them incompatible with one specific spin condition. The decomposition of the MPD equation, again supplemented by writing its right-hand side in terms of the Weyl scalars, is slightly less efficient than in the massive case, because ${u}^{\ensuremath{\mu}}$ cannot be freely chosen (in contrast to ${V}^{\ensuremath{\mu}}$) and so the ${u}^{\ensuremath{\mu}}$-based tetrad is less flexible. In the second part of this paper, a similar analysis is performed for massless spinning particles; in particular, a certain intrinsic interpretation tetrad is again found. The respective decomposition of the MPD equation of motion is considerably simpler than in the massive case, containing only ${\mathrm{\ensuremath{\Psi}}}_{1}$ and ${\mathrm{\ensuremath{\Psi}}}_{2}$ scalars and not the cosmological constant. An option to span the spin-bivector eigenplane, besides the worldline null tangent, by a main principal null direction of the Weyl tensor can lead to an even simpler result.

How do giant planetary cores shape the dust disk?

We are observing, thanks to ALMA, the dust distribution in the region of active planet formation around young stars. This is a powerful tool to connect observations with theoretical models and improve our understandings of the processes at play. We want to test how a multi-planetary system shapes its birth disk and study the influence of the planetary masses and particle sizes on the final dust distribution. Moreover, we apply our model to the HL Tau system in order to obtain some insights on the physical parameters of the planets that are able to create the observed features. We follow the evolution of a population of dust particles, treated as Lagrangian particles, in two-dimensional, locally isothermal disks where two equal mass planets are present. The planets are kept in fixed orbits and they do not accrete mass. The outer planet plays a major role removing the dust particles in the co-orbital region of the inner planet and forming a particle ring which promotes the development of vortices respect to the single planetary case. The ring and gaps width depends strongly on the planetary mass and particle stopping times, and for the more massive cases the ring clumps in few stable points that are able to collect a high mass fraction. The features observed in the HL Tau system can be explained through the presence of several massive cores that shape the dust disk, where the inner planet(s) should have a mass on the order of 0.07 Jupiter masses and the outer one(s) on the order of 0.35 Jupiter masses. These values can be significantly lower if the disk mass turns out to be less than previously estimated. Decreasing the disk mass by a factor 10 we obtain similar gap widths for planets with a mass of 10 and 20 Earth masses respectively. Although the particle gaps are prominent, the expected gaseous gaps would be barely visible.

Fístula carótido-cavernosa espontánea bilateral: reporte de caso y revisión de la literatura

Carotid cavernous fistulas are abnormal connections between the internal or external carotid artery or any branches and the cavernous sinus. They are characterised by proptosis, chemosis and orbital bruits. The carotid cavernous fistulas have a low incidence, especially if they are spontaneous and bilateral. They are associated with high morbidity, and require high clinical suspicion, early diagnosis, and specific treatment. They require emergency management when presented with signs of poor prognosis, such as rapidly progressive proptosis, intra-cerebral haemorrhage, or massive epistaxisThe case is presented of a 56 year-old patient with a history of bilateral glaucoma, high blood pressure (arterial hypertension), and chronic headache. She consulted due to changes in the pattern of headache, with signs of red flag due to the rapidly progressive severe pain, loss of consciousness and subsequent amnesia of the event. The cranial computed tomography scan showed asymmetry of the cavernous sinus and a hyperdense area to the right side. The magnetic resonance showed loss of cleavage in the segment of the cavernous portion of the right internal carotid artery, a finding suggestive of recent bleeding aneurysm. A cerebral angiography was performed, and a Barrow type D bilateral carotid cavernous fistula was diagnosed. Endovascular therapy was performed, with successful obliteration of both carotid cavernous fistulas.The literature review is presented along with evidence about the treatment of this disease.

SUPERNOVAE AND THEIR EXPANDING BLAST WAVES DURING THE EARLY EVOLUTION OF GALACTIC GLOBULAR CLUSTERS

Our arguments deal with the early evolution of Galactic globular clusters and show why only a few of the supernovae (SNe) products were retained within globular clusters and only in the most massive cases (M ≥ 106 M⊙), while less massive clusters were not contaminated at all by SNe. Here, we show that SN blast waves evolving in a steep density gradient undergo blowout and end up discharging their energy and metals into the medium surrounding the clusters. This inhibits the dispersal and the contamination of the gas left over from a first stellar generation. Only the ejecta from well-centered SNe that evolve into a high-density medium available for a second stellar generation (2SG) in the most massive clusters would be retained. These are likely to mix their products with the remaining gas, eventually leading in these cases to an Fe-contaminated 2SG.