The European Physical Journal C

http://link.springer.com/journal/10052

List of Papers (Total 4,485)

\(\mathcal{P}\) –v criticality in gauged supergravities

AdS black holes show richer transition behaviors in extended phase space by assuming the cosmological constant and its conjugate quantity to behave like thermodynamic pressure and thermodynamic volume. We study the extended thermodynamics of charged dilatonic AdS black holes in a class of Einstein–Maxwell-dilaton theories that can be embedded in gauged supergravities in various...

Black holes with Lambert W function horizons

We consider Einstein gravity with a negative cosmological constant endowed with distinct matter sources. The different models analyzed here share the following two properties: (1) they admit static symmetric solutions with planar base manifold characterized by their mass and some additional Noetherian charges, and (2) the contribution of these latter in the metric has a slower...

Gradient flows for \(\beta \) functions via multi-scale renormalization group equations

Renormalization schemes and cutoff schemes allow for the introduction of various distinct renormalization scales for distinct couplings. We consider the coupled renormalization group flow of several marginal couplings which depend on just as many renormalization scales. The usual \(\beta \) functions describing the flow with respect to a common global scale are assumed to be...

Radiative dynamical mass of planar charged fermion in a constant homogeneous magnetic field

The effective Lagrangian and mass operator are calculated for planar charged massive and massless fermions in a constant external homogeneous magnetic field in the one-loop approximation of the 2+1 dimensional quantum electrodynamics (QED\(_{2+1}\)). We obtain the renormalizable effective Lagrangian and the fermion mass operator for a charged fermion of mass m and then calculate...

Strong equivalence principle and gravitational wave polarizations in Horndeski theory

The relative acceleration between two nearby particles moving along accelerated trajectories is studied, which generalizes the geodesic deviation equation. The polarization content of the gravitational wave in Horndeski theory is investigated by examining the relative acceleration between two self-gravitating particles. It is found out that the apparent longitudinal polarization...

Polar solutions with tensorial connection of the spinor equation

Dirac field equations are studied for spinor fields without any external interaction and when they are considered on a background having a tensorial connection with a specific non-vanishing structure some solution can be found in polar form displaying a square-integrable localized behaviour.

Holographic entanglement negativity for disjoint intervals in \(AdS_3/CFT_2\)

We advance a holographic construction for the entanglement negativity of bipartite mixed state configurations of two disjoint intervals in \((1+1)\) dimensional conformal field theories (\(CFT_{1+1}\)) through the \(AdS_3/CFT_2\) correspondence. Our construction constitutes the large central charge analysis of the entanglement negativity for mixed states under consideration and...

Holography of electrically and magnetically charged black branes

We construct a new class of black brane solutions in Einstein-Maxwell-dilaton (EMD) theory, which is characterized by two parameters a, b. Based on the obtained solutions, we make detailed analysis on the ground state in zero temperature limit and find that for many cases it exhibits the behavior of vanishing entropy density. We also find that the linear-T resistivity can be...

On the general relativistic framework of the Sagnac effect

The Sagnac effect is usually considered as being a relativistic effect produced in an interferometer when the device is rotating. General relativistic explanations are known and already widely explained in many papers. Such general relativistic approaches are founded on Einstein’s equivalence principle (EEP), which states the equivalence between the gravitational “force” and the...

A new experimental approach to probe QCD axion dark matter in the mass range above \({ 40}\,{\upmu }\mathrm{{eV}}\)

The axion emerges in extensions of the Standard Model that explain the absence of CP violation in the strong interactions. Simultaneously, it can provide naturally the cold dark matter in our universe. Several searches for axions and axion-like particles (ALPs) have constrained the corresponding parameter space over the last decades but no unambiguous hints of their existence...

Strong decays of the Y(4660) as a vector tetraquark state in solid quark-hadron duality

In this article, we choose the \([sc]_P[\bar{s}\bar{c}]_A-[sc]_A[\bar{s}\bar{c}]_P\) type tetraquark current to study the hadronic coupling constants in the strong decays \(Y(4660)\rightarrow J/\psi f_0(980)\), \( \eta _c \phi (1020)\), \( \chi _{c0}\phi (1020)\), \( D_s \bar{D}_s\), \( D_s^* \bar{D}^*_s\), \( D_s \bar{D}^*_s\), \( D_s^* \bar{D}_s\), \( \psi ^\prime \pi ^+\pi...

Constraints on differential Shapiro delay between neutrinos and photons from IceCube-170922A

On 22nd September 2017, the IceCube Collaboration detected a neutrino with energy of about 290 TeV from the direction of the gamma-ray blazar TXS 0506+056, located at a distance of about 1.75 Gpc. During the same time, enhanced gamma-ray flaring was also simultaneously observed from multiple telescopes, giving rise to only the second coincident astrophysical neutrino/photon...

Extending the predictive power of perturbative QCD

The predictive power of perturbative QCD (pQCD) depends on two important issues: (1) how to eliminate the renormalization scheme-and-scale ambiguities at fixed order, and (2) how to reliably estimate the contributions of unknown higher-order terms using information from the known pQCD series. The Principle of Maximum Conformality (PMC) satisfies all of the principles of the...

On the critical energy required for homogeneous nucleation in bubble chambers employed in dark matter searches

Two equations for the calculation of the critical energy required for homogeneous nucleation in a superheated liquid, and the related critical radius of the nucleated vapour bubble, are obtained, the former by the direct application of the first law of thermodynamics, the latter by considering that the bubble formation implies the overcoming of a barrier of the free enthalpy...

\(k_T\) -factorization approach to the Higgs boson production in \(ZZ^*\rightarrow 4\ell \) channel at the LHC

We calculated a differential cross section of the Higgs boson production in the \(h\rightarrow ZZ^*\rightarrow 4\ell \) decay channel within the framework of \(k_T\)-factorization. Results are obtained using an off-shell matrix element for the \(g^*g^*\rightarrow h\rightarrow ZZ^*\rightarrow 4\ell \) process together with Ciafaloni–Catani–Fiorani–Marchesini (CCFM) evolution...

Scalar perturbations and quasi-normal modes of a nonlinear magnetic-charged black hole surrounded by quintessence

We study scalar perturbations and quasi-normal modes of a nonlinear magnetic-charged black hole surrounded by quintessence. The time evolution of scalar perturbations is studied for different parameters associated with the black hole solution. We also study the reflection and transmission coefficients along with absorption cross section for the considered black hole spacetime. It...

Studying minijets and MPI with rapidity correlations

We propose and carry a detailed study of an observable sensitive to different mechanisms of minijet production. The observables measure how the transverse momenta of hadrons produced in association with various trigger objects are balanced as a function of rapidity. It is shown that the observables are sensitive to the model parameters relevant for the minijet production...

Reconstruction of energy conditions from observations and implications for extended theories of gravity

The attempt to describe the recent accelerated expansion of the Universe includes different propositions for dark energy models and modified gravity theories. Establish their features in order to discriminate and even rule out part of these models using observational data is a fundamental issue of cosmology. In the present work we consider a class of extended theories of gravity...

Low-redshift constraints on the Hubble constant from the baryon acoustic oscillation “standard rulers” and the gravitational wave “standard sirens”

The multi-messenger observations of GW170817 indicated a new independent measurement of the Hubble constant (\(H_0\)). We obtain the low-redshift cosmological constraints on \(H_0\) by combining this gravitational wave measurement with the observations of distance scales in baryon acoustic oscillations. Using Fisher information matrix, we estimate the projected constraints on...

Moment of inertia–mass universal relations for neutron stars in scalar-tensor theory with self-interacting massive scalar field

We are investigating universal relations between different normalisations of the moment of inertia and the compactness of neutron stars in slow rotation approximation. We study the relations in particular class of massive scalar-sensor theories with self-interaction, for which significant deviations from General Relativity are allowed for values of the parameters that are in...

Description of the \(\Xi _c\) and \(\Xi _b\) states as molecular states

In this work we study several \(\Xi _c\) and \(\Xi _b\) states dynamically generated from the meson–baryon interaction in coupled channels, using an extension of the local hidden gauge approach in the Bethe–Salpeter equation. These molecular states appear as poles of the scattering amplitudes, and several of them can be identified with the experimentally observed \(\Xi _c...

Thin shells surrounding black holes in F(R) gravity

In this article, we consider spherical thin shells of matter surrounding black holes in F(R) theories of gravity. We study the stability of the static configurations under perturbations that conserve the symmetry. In particular, we analyze the case of charged shells outside the horizon of non-charged black holes. We obtain that stable static thin shells are possible if the values...

Comparing the dynamics of diagonal and general Bianchi IX spacetime

We make comparison of the dynamics of the diagonal and nondiagonal Bianchi IX models in the evolution towards the cosmological singularity. Apart from the original variables, we use the Hubble normalized ones commonly applied in the examination of the dynamics of homogeneous models. Applying the dynamical systems method leads to the result that in both cases the continuous space...

Generalized anisotropic models for conformal symmetry

We find a new family of exact solutions to the Einstein system of equations with an anisotropic fluid distribution for a spherically symmetric spacetime containing a conformal Killing vector. Simple analytic expressions describe the matter variables and the metric functions which are regular at the centre and the interior of the body. We demonstrate that the new class of exact...

Isolating the chiral magnetic effect from backgrounds by pair invariant mass

Topological gluon configurations in quantum chromodynamics induce quark chirality imbalance in local domains, which can result in the chiral magnetic effect (CME) – an electric charge separation along a strong magnetic field. Experimental searches for the CME in relativistic heavy ion collisions via the charge-dependent azimuthal correlator (\(\Delta \gamma \)) suffer from large...