3,712 research outputs found
Meissner masses in the gCFL phase of QCD
We calculate the Meissner masses of gluons in neutral three-flavor color
superconducting matter for finite strange quark mass. In the CFL phase the
eissner masses are slowly varying function of the strange quark mass. For large
strange quark mass, in the so called gCFL phase, the Meissner masses of gluons
with colors and 8 become imaginary, indicating an instability.Comment: New Fig. 1 shows that also the masses of the gluons 3 and 8 are
imaginar
Critical Endpoint and Inverse Magnetic Catalysis for Finite Temperature and Density Quark Matter in a Magnetic Background
In this article we study chiral symmetry breaking for quark matter in a
magnetic background, , at finite temperature and quark chemical
potential, , making use of the Ginzburg-Landau effective action formalism.
As a microscopic model to compute the effective action we use the renormalized
quark-meson model. Our main goal is to study the evolution of the critical
endpoint, , as a function of the magnetic field strength, and
investigate on the realization of inverse magnetic catalysis at finite chemical
potential. We find that the phase transition at zero chemical potential is
always of the second order; for small and intermediate values of ,
moves towards small , while for larger it moves
towards moderately larger values of . Our results are in agreement with
the inverse magnetic catalysis scenario at finite chemical potential and not
too large values of the magnetic field, while at larger direct magnetic
catalysis sets in.Comment: 6 pages, 2 figure
Enforced neutrality and color-flavor unlocking in the three-flavor Polyakov-loop NJL model
We study how the charge neutrality affects the phase structure of
three-flavor PNJL model. We point out that, within the conventional PNJL model
at finite density the color neutrality is missing because the Wilson line
serves as an external ``colored'' field coupled to dynamical quarks. In this
paper we heuristically assume that the model may still be applicable. To get
color neutrality one has then to allow non vanishing color chemical potentials.
We study how the quark matter phase diagram in -plane is
affected by imposing neutrality and by including the Polyakov loop dynamics.
Although these two effects are correlated in a nonlinear way, the impact of the
Polyakov loop turns out to be significant in the direction, while imposing
neutrality brings a remarkable effect in the direction. In
particular, we find a novel unlocking transition, when the temperature is
increased, even in the chiral SU(3) limit. We clarify how and why this is
possible once the dynamics of the colored Polyakov loop is taken into account.
Also we succeed in giving an analytic expression for for the transition
from two-flavor pairing (2SC) to unpaired quark matter in the presence of the
Polyakov loop.Comment: 11 pages, REVTex4, 10 eps figures; v2: added two notes, added a
reference; version to appear in Phys. Rev.
A clinical review on megalencephaly: A large brain as a possible sign of cerebral impairment.
Megalencephaly and macrocephaly present with a head circumference measurement 2 standard deviations above the age-related mean. However, even if pathologic events resulting in both megalencephaly and macrocephaly may coexist, a distinction between these two entities is appropriate, as they represent clinical expression of different disorders with a different approach in clinical work-up, overall prognosis, and treatment. Megalencephaly defines an increased growth of cerebral structures related to dysfunctional anomalies during the various steps of brain development in the neuronal proliferation and/or migration phases or as a consequence of postnatal abnormal events. The disorders associated with megalencephaly are classically defined into 3 groups: idiopathic or benign, metabolic, and anatomic. In this article, we seek to underline the clinical aspect of megalencephaly, emphasizing the main disorders that manifest with this anomaly in an attempt to properly categorize these disorders within the megalencephaly group
Metaverse in the tourism domain – introduction to the special issue
In times of technological innovation and digital transformation, the convergence of Metaverse and tourism emerges as a compelling and revolutionary intersection. As we stand on the edge of a new frontier in information technology, we introduce this special issue of the Journal of Information Technology and Tourism, dedicated to the multifaceted exploration of the Metaverse’s impact on the tourism industry.
The Metaverse comprises interconnected digital spaces where users can engage through computer-generated environments. This convergence of cutting-edge tech- nologies, including artificial Intelligence (AI) systems, digital twins, augmented reality (AR), virtual reality (VR), blockchain, non-fungible tokens (NFTs), 3D mod- elling and simulation, cloud computing, and edge computing, defines the Metaverse’s potential. The Metaverse’s profound Influence on the tourism domain is well attested by the rigorous examinations, insightful analyses, and innovative research contributions in this issue. As we embark on this exploration, we encourage researchers, scholars, and industry experts to contribute their expertise and insights, forging a path toward a deeper understanding of the Metaverse’s implications for the future of tourism
Metaverse in the tourism domain - introduction to the special issue (part 2)
Metaverse for Tourists and tourism destinations explores how Metaverse and its underlying technologies can reshape the tourism industry, considering both the supply and the demand perspectives. The paper reviews several works on this theme, summarizing the outcomes that present several promising solutions.
In Metaverse and Tourism Development: Issues and Opportunities in Stakeholders’ Perception, the objective is to understand how the managers of tourism attractions (archaeological parks, museums, seaside resorts, nature reserves, etc.) face the challenges and the use of digital transformation and specifically how including Metaverse tools in their strategies. The results show the influence of the stakeholders’ perception of the Metaverse and confirm the existence of heterogeneous preferences
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