We investigate rotating effect on deconfinement phase transition in an Einstein-Maxwell-Dilaton(EMD) model bottom-up holographic QCD approach. By constructing a black hole, which is supposed to be dual strongly coupled nuclear matter, we the thermodynamic quantities, including entropy density, pressure, energy trace anomaly, sound speed and specific heat for both pure gluon system two-flavor under rotation. It shown that those quantities would enhanced by large angular velocity. Also,...

We report a detailed first-principles calculation to investigate the structures, elastic constants, and phase transition of Ti. The axial ratios both α-Ti ω-Ti are nearly constant under hydrostatic compression, which confirms latest experimental results. From high pressure we find that is unstable when applied pressures larger than 24.2 GPa, but mechanically stable at all range calculated pressure. phonon dispersion curves agree well with experiments. Under captured large softening around Γ...

We investigate in detail the chiral thermal transition of QCD an improved soft-wall AdS/QCD model with a simply modified 5D conformal mass bulk scalar field. also present calculation this for light meson spectra and other low-energy characteristic quantities including pion form factor, π–ρ coupling constant decay constants π, ρ, a1, which are shown to result good agreement experimental data except constant. The behavior condensate is studied. It found that such incorporates crossover...

We study the spectra of two-gluon glueballs and three-gluon oddballs corresponding equation state in $5$-dimensional deformed holographic QCD models graviton-dilaton system, where metric, dilaton field potential are self-consistently solved from each other through Einstein equations motion field. compare by inputting field, metric potential, find that with only 2 parameters, model predictions on glueballs/oddballs general good agreement lattice results except two $0^{+-}$ $2^{+-}$. From at...

The Primakoff mechanism is one of the primary channels for production solar axions. In canonical estimations photon-axion conversion rate, recoil effect neglected and a static structure factor in adopted. By use linear response theory, we provide dynamic description process. It found that collective electrons overtake ions as dominant factor, contrast to screening picture, where contribute more conversion. Nonetheless, resulting axion flux only 1% 2% lower than standard estimate based on factor.

We study the chemical potential effects on chiral phase transition in a simply improved soft-wall AdS/QCD model, which can realize consistently properties of linear confinement and spontaneous symmetry breaking. The $\mu-T$ diagrams with both zero physical quark masses have been obtained from this model. For case mass, has crossover behavior at low potential. With increase $\mu$, critical temperature $T_c$ descends towards zero, turns into first-order one some intermediate value implies that...

Recent studies have theoretically investigated the atomic excitation and ionization induced by dark matter--nucleus scattering, it was found that suddenly recoiled atom is much more likely to excite or lose its electrons than expected. This phenomenon called ``Migdal effect.'' In this paper, we extend established strategy describe Migdal effect in isolated atoms case semiconductors under framework of tight-binding approximation. Since localized aspects are respected form Wannier functions,...

We study the chiral phase transition with $2+1$ quark flavors in an improved soft-wall AdS/QCD model, which can produce light meson spectrum and many other low-energy quantities consistent experiments two-flavor case. The behaviors of condensates at different masses are analyzed detail, (${m}_{u,d}$, ${m}_{s}$) diagram for sector has been obtained from model. find that features calculated completely standard scenario, is supported by lattice simulations theoretical arguments. evidence a...

We give a further study on chiral phase diagram in the improved soft-wall AdS/QCD model with $2+1$ flavors. The equations of motion for octet pseudoscalar, vector, and axial-vector mesons are derived to compute meson spectra relevant decay constants, by which parameters determined. chemical potential effects thermal transition condensate investigated, enables us obtain $\ensuremath{\mu}\ensuremath{-}T$ plane. find that critical endpoint linking crossover first-order still exists locates at...

In this work, we compute the precise late-time asymptotics for scalar field in interior of a non-static subextreme Kerr black hole, based on recent progress deriving its exterior region. This provides new proof generic <inline-formula content-type="math/mathml"> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="upper H Subscript loc Superscript 1"> <mml:semantics> <mml:msubsup> <mml:mi>H</mml:mi> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:mtext>loc</mml:mtext> </mml:mrow>...

Abstract The critical collapse of a scalar field is threshold solution black hole formation, in which naked singularity arises. We study here the curvature strength this using numerical ansatz. behavior Jacobi volume forms examined along non-spacelike geodesic limit approach to singularity. These are seen be vanishing, thus showing that all physical objects will crushed zero size near Consequently, although considered fine-tuning problem, forming gravitationally strong. This implies...

The equation of state (EoS) for cold dense matter inside neutron stars is investigated by using holographic QCD models in the framework Einstein-Maxwell-dilaton (EMD) system and improved Karch-Katz-Son-Stephanov (KKSS) action part. This method describing nuclear EMD$+$KKSS different from that Dirac-Born-Infeld (DBI) Chern-Simons (CS) terms. Combining with Hebeler-Lattimer-Pethick-Schwenk (HLPS) intermediate (EoS), hybrid EoS constructed. obtained located range defined low-density chiral...

The physics of the electronic excitation in semiconductors induced by sub-GeV dark matter (DM) have been extensively discussed literature, under framework standard plane wave (PW) and pseudopotential calculation scheme. In this paper, we investigate implication all-electron (AE) reconstruction on estimation DM-induced transition event rates. As a benchmark study, first calculate wavefunctions silicon germanium bulk crystals based both AE pseudo (PS) schemes within projector augmented (PAW)...

The Primakoff mechanism is one of the primary channels for production solar axion. In canonical estimation photon-axion conversion rate, recoil effect neglected and a static structure factor adopted. By use linear response theory, we provide dynamic description process. It found that collective electrons overtake ions as dominant factor, in contrast to screening picture where contribute more conversion. Nonetheless, resulting axion flux only 1-2% lower than standard estimate based on factor.

We give a further study on the improved soft-wall AdS/QCD model with two flavors. The chiral transition behaviors are studied in case of finite chemical potential, phase diagram obtained at zero quark mass. thermal spectral functions vector and axial-vector mesons calculated, in-medium melting properties investigated. find that meson potential can be qualitatively described by model, except region large potential. reason for these inadequate descriptions may background geometry adopted is...

We report a first-principles calculation to investigate the structural instability of rutile TiO2. The high pressure parameters are well reproduced. calculated phonon dispersion curves agree with experiments at zero pressure. Under compression, we capture large softening around Г point, which indicates instability. From elastic constants, find that TiO2 is unstable when applied larger than 17.7 GPa. Within quasi-harmonic approximation, thermal equation state, expansion coefficient, bulk...