The $f_0(1710)$ was previously proposed to be a dynamically generated state with interactions between vector mesons. We extend the study of $f_0(1710)$ by including its coupling to channels of pseudoscalar mesons within the coupled-channel approach. The channels involved are $K^{*}{\overline{K}}^{*},\rho \rho ,\omega \omega ,\varphi \varphi ,\omega \varphi ,\pi \pi ,K\overline{K},\eta \eta$. We show that the pole assigned to $f_0(1710)$ does not change much. Then we calculate the partial decay widths of $f_0(1710)\to K^{*}{\overline{K}}^{*}\to \pi \pi ,K\overline{K},\eta \eta$ as the coupled channel dynamically generated state as well as assuming it to be a pure $K^{*}{\overline{K}}^{*}$ molecule. In both cases the ratios of partial decay widths agree fairly with that in PDG.

In this paper, we study circuit complexity in Proca theory with Nielsen’s approach and Fubini-Study (FS) metric approach. We place the fields on a lattice to gain a regularized theory, and obtain the ground state by adopting proper coordinates. We calculate complexities of the ground and the thermofield double (TFD) states with Nielsen’s approach—complexity of the TFD state is found to grow like a logarithmic function. We quantize the Proca fields and give the approximate ground state and the TFD state by applying unitary circuit operators to the associated reference states. The circuit lengths are calculated with a FS metric—the minimal lengths are given according to the associated geometric spaces. The complexity of the TFD state is found to grow linearly with time.

We study some consequences of the loop quantization of the outermost dust shell in the Lemaître-Tolman-Bondi spacetime with a homogeneous dust density using different quantization strategies motivated by loop quantum gravity. Prior work has dealt with loop quantizing this model by employing holonomies and the triads, following the procedure in standard loop quantum cosmology. In this work we compare this quantization with the one in which holonomies and gauge-covariant fluxes are used. While both of the quantization schemes resolve the central singularity, they lead to different mass gaps at which a trapped surface forms. This trapped surface which is matched to an exterior generalized Vaidya spacetime disappears when the density of the dust cloud is in the Planck regime. We find that the quantization based on holonomies and gauge-covariant fluxes generically results in an asymmetric evolution of the dust shell in which the Vaidya mass associated with the white hole as seen by an external observer is $2/\pi$ of the one for the black hole. This effective difference in masses results from difference in the classical limits in pre- and postbounce regimes in the two quantizations. This distinctive feature rules out formation of any black-hole-white-hole twins in presence of gauge-covariant flux modifications, which is in contrast to the quantization using holonomies and triads where the gravitational collapse always leads to black hole–white hole twins. Another striking difference lies in the fact that for the quantization based on holonomies and gauge-covariant fluxes there can be situations in which during a nonsingular collapse only a black hole forms without a white hole.

We show that in some kink-antikink collisions, sphalerons, i.e., unstable static solutions—rather than the asymptotic free soliton states—can be the source of the internal degrees of freedom (normal modes), which trigger the resonance phenomenon responsible for the fractal structure in the final state formation.

We provide a “user-friendly” algorithm to systematically and rapidly obtain exact planar black hole solutions in the Einstein-Maxwell theory deformed by the most general shift- and reflection-symmetric Horndeski sector where the usual Galileon is replaced by a tuple of scalars with profiles linear in the coordinates of the transverse manifold. Under precise assumptions, these axion backgrounds break the translational invariance of the system, causing momentum dissipation in the holographically dual field theory. The success of the method relies on the simple realization that the bulk equations of motion become more tractable when written in terms of the axions kinetic terms, instead of the radial coordinate. Showcasing this particularly efficient recipe, we derive novel asymptotically anti-de Sitter black holes and show that their extremal counterparts always flow to an ${\mathrm{AdS}}_2\times {\mathbb{R}}^2$ infrared fixed point. Additionally, we report an interesting family of new asymptotically Lifshitz black hole solutions with $z>1$. Finally, we discuss the dc transport properties of the dual relativistic field theories in view of possible applications to condensed matter systems.

Employing the thermodynamic geometry approach, we explore the phase transition of four-dimensional spinning black holes in an anti–de Sitter (AdS) space and find the following novel results. (i) Contrary to the charged AdS black hole, thermodynamic curvature of the spinning AdS black hole diverges at the critical point, without needing normalization. (ii) There is a certain region with small entropy in the space of parameters for which the thermodynamic curvature is positive and the repulsive interaction dominates. Such behavior exists even when the pressure is extremely large. (iii) The dominant interactions in the microstructure of extremal spinning AdS black holes are strongly repulsive, which is similar to an ideal gas of fermions at zero temperature. (iv) The maximum of thermodynamic curvature, $|R|$, is equal to $C_P$ maximum values for the Van der Waals fluid in the supercritical region, while for the black hole, they are close to each other near the critical point.

We consider a scenario of modified gravity, which is generic to late-time acceleration, namely, acceleration in the Jordan frame and no acceleration in the Einstein frame. The possibility is realized by assuming an interaction between dark matter and the baryonic component in the Einstein frame which is removed by going to the Jordan frame using a disformal transformation giving rise to an exotic effective fluid responsible for causing phantom crossing at late times. In this scenario, past evolution is not distinguished from $\mathrm{\Lambda }\mathrm{CDM}$ but late time dynamics is generically different due to the presence of phantom crossing that causes a monotonous increase in the expansion rate giving rise to distinctive late-time cosmic feature. The latter can play a crucial role in addressing the tension between the observed value of Hubble parameter by CMB (cosmic microwave background) measurements and the local observations. We demonstrate that the Hubble tension significantly reduces in the scenario under consideration for the chosen scale factor parametrizations. The estimated age of the universe in the model is well within the observational bounds in the low and high redshift regimes.

The Copernican principle $(CP)$, i.e. the assumption that we are not privileged observers of the Universe, is a fundamental tenet of the standard cosmological model. A violation of this postulate implies the possibility that the apparent cosmic acceleration could be explained without the need of a cosmological constant, dark energy or covariant modifications of gravity. In this paper we present a new test of the $CP$ relating the distance and the expansion rate, derived via Noether’s theorem, which is complementary to other tests found in the literature. We also simulate fiducial data based on upcoming stage IV galaxy surveys and use them to reconstruct the Hubble rate $H(z)$ and the angular diameter distance $d_A(z)$ in order to forecast how well our null test can constrain deviations from the cosmological constant model. We find that our new test can easily rule out several scenarios based on the Lemaître-Tolman-Bondi void model at confidence of $\gtrsim 3\sigma$ at middle to high redshifts $(z>0.5)$.

We explore the reach of low-background experiments made of small quantities of heavy nuclear isotopes in probing the parameter space of inelastic dark matter that is kinematically inaccessible to classic direct detection experiments. Through inelastic scattering with target nuclei, dark matter can yield a signal via either nuclear recoil or nuclear excitation. We present new results based on this approach, using data from low-energy gamma quanta searches in low-background experiments with Hf and Os metal samples and measurements with ${\mathrm{CaWO}}_4$ and ${\mathrm{PbWO}}_4$ crystals as scintillating bolometers. We place novel bounds on WIMPy inelastic dark matter up to mass splittings of about 640 keV and provide forecasts for the reach of future experiments.

The electroweak properties of light and charmed $D$ and $D_s$ pseudoscalar mesons are investigated within a unified covariant constituent quark model. The quark-antiquark-meson vertices are assumed to have a symmetric form by the exchange of quark momenta, which is successful in describing the light pseudoscalar meson properties. The flavor decomposition of the elastic electromagnetic form factors, electromagnetic charge radii, and weak decay constants are calculated. Based on the results a discussion on the SU(3) and SU(4) symmetry breaking is made and a comparison with the pion and kaon properties to highlight the Higgs contribution to the structure of these mesons.

The basic expressions for the differential nuclear bremsstrahlung cross section at high electron energy, as derived under different theoretical approaches and approximations to quantum coherence effects, are compared. The Baier-Katkov treatment is reformulated to allow introduction of the same value of the radiation length in all calculations. A dedicated Monte Carlo code is employed for obtaining photon energy spectra in the framework of the Baier-Katkov approach taking into account multiphoton emission, attenuation by pair production, and pile-up with photons from the background. The results of Monte Carlo simulations for both the Migdal and Baier-Katkov descriptions are compared to all available data that show the Landau-Pomeranchuk-Migdal suppression. The issue of the sensitivity of the experiments to the difference of the two approaches is investigated.

Due to the rapid longitudinal expansion of the quark gluon plasma created in heavy-ion collisions, large local-rest-frame momentum-space anisotropies are generated during the system’s evolution. These momentum-space anisotropies complicate the modeling of heavy-quarkonium dynamics in the quark gluon plasma due to the fact that the resulting interquark potentials are spatially anisotropic, requiring real-time solution of the 3D Schrödinger equation. Herein, we introduce a method for reducing anisotropic heavy-quark potentials to isotropic ones by introducing an effective screening mass that depends on the quantum numbers $l$ and $m$ of a given state. We demonstrate that, using the resulting effective Debye screening masses, one can solve a 1D Schrödinger equation and reproduce the full 3D results for the energies and binding energies of low-lying heavy-quarkonium bound states to relatively high accuracy. The resulting effective isotropic potential models could provide an efficient method for including momentum-anisotropy effects in open quantum system simulations of heavy-quarkonium dynamics in the quark gluon plasma.

We consider a neutrinophilic $U(1)$ extension of the standard model (SM) which couples only to SM isosinglet neutral fermions, charged under the new group. The neutral fermions couple to the SM matter fields through Yukawa interactions. The neutrinos in the model get their masses from a standard inverse-seesaw mechanism while an added scalar sector is responsible for the breaking of the gauged $U(1)$ leading to a light neutral gauge boson ($Z^{\prime }$), which has minimal interaction with the SM sector. We study the phenomenology of having such a light $Z^{\prime }$ in the context of neutrinophilic interactions as well as the role of allowing kinetic mixing between the new $U(1)$ group with the SM hypercharge group. We show that current experimental searches allow for a very light $Z^{\prime }$ if it does not couple to SM fields directly and highlight the search strategies at the LHC. We observe that multilepton final states in the form of $(4\ell +{\cancel{E}}_T)$ and $(3\ell +2j+{\cancel{E}}_T)$ could be crucial in discovering such a neutrinophilic gauge boson lying in a mass range of 200–500 GeV.

There has been much recent interest in long-lived massive particles at the LHC, understood as those with lifetimes between tens of micrometers and several meters. In this context, we consider the possibility of long-lived electroweak singlet scalars charged under the color SU(3) with masses near a TeV. The shortest lifetime of interest is already longer than typical hadronization scales. These exotic new particles would therefore appear as color-singlet bound states of the new scalars with quarks and gluons, and it is their color charge that prevents them from decaying. In particular, we consider color representations consistent with maintaining asymptotic freedom, those with dimensionality $d_R\le 15$. We find that only the octets can decay, and they do so into multijet final states through the two-gluon channel. The other representations are stable and form fractionally charged color singlets, with the decuplet being the only one that can form electrically neutral color singlets.

We perform an exclusive study on the feebly interacting massive particle dark matter candidate in an extended hyperchargeless ($Y=0$) Higgs triplet model. The additional $Z_2$ odd neutral fermion singlet plays the role of dark matter with support from two other vectorlike fermion doublets. The mixing between the neutral component of a doublet and singlet fermions controls the current relic density through the freeze-in mechanism, whereas the additional doublet fermion helps to get the neutrino mass and mixing angles. We obtain a broad region of the parameter spaces satisfying the current relic density and neutrino mass and mixing angles.

The Standard Model (SM) predicts that $\mathrm{\Delta }{A}_{CP}$, the difference between the direct $CP$ asymmetries for the modes $B^{+}\to {\pi }^0{K}^{+}$ and $B^0\to {\pi }^{-}{K}^{+}$ that are related by a weak isospin, should be close to zero. There has been a recent claim by the LHCb Collaboration that the measured value of $\mathrm{\Delta }{A}_{CP}$ shows an uncomfortable tension with the SM prediction, almost at the $8\sigma$ level. Motivated by this claim, we critically reexamine the data on all the $B\to \pi K$ modes, including the $CP$ asymmetries and $CP$-averaged branching fractions. From a combined Bayesian analysis with the topological amplitudes and their phases as the free parameters, we find that the best-fit region has a large overlap with the parameter space favored in the SM, albeit with some enhancement for the electroweak penguin and the color-suppressed tree amplitudes; consistent with the findings of earlier studies. We find that in this SM-like region, $\mathrm{\Delta }{A}_{CP}$ is more than $5\sigma$ away from zero and the tension with the global average, as well as the LHCb result, is within $2\sigma$. Thus, we conclude that there is not yet enough motivation to go beyond the SM.

Theories which provide a dynamical explanation for the large top quark mass often include TeV-scale vectorlike top quark and bottom quark partner states which can be potentially discovered at the LHC. These states are currently probed through model-independent searches for pair production via gluon fusion, as well as through model-dependent complementary electroweak single production. In this paper we study the potential to extend those searches for the partners of the third-generation Standard Model quarks on the basis of their expected chromomagnetic interactions. We discuss how current searches for “excited” bottom quarks produced via $b$-gluon fusion through chromomagnetic interactions are relevant, and provide significant constraints. We then explore the region of the parameter space in which the bottom quark partner is heavier than the top quark partner, in which case the top partner can be primarily produced via the decay of the bottom partner. Next, we probe the potential of the production of a single top quark partner in association with an ordinary top quark by gluon fusion. Kinematically these two new processes are similar, and they yield the production of a heavy top partner and a lighter Standard Model state, a pattern which allows for the rejection of the associated dominant Standard Model backgrounds. We examine the sensitivity of these modes in the case where the top partner subsequently decays to a Higgs boson and an ordinary top quark, and we demonstrate that these new channels have the potential of extending and complementing the conventional strategies at the LHC run III and at the high-luminosity phase of the LHC. In this last case, we find that partner masses that range up to about 3 TeV can be reached. This substantially expands the expected mass reach for these new states, including regions of parameter space that are inaccessible by traditional searches.

A process specific methodology is defined to systematically assign theoretical uncertainties in the Standard Model effective field theory when performing leading-order global fits. The method outlined also minimizes the computational and theoretical burden to systematically advance such analyses to dimension eight.

We find chiral non-Abelian vortices having windings only in one of the diquark condensations of left-handed and right-handed quarks in the color-flavor locked phase of dense QCD. They are the minimum vortices carrying half color magnetic fluxes of those of non-Abelian semisuperfluid vortices (color magnetic flux tubes) and $1/6$ quantized superfluid circulations of Abelian superfluid vortices. These vortices carry $\mathbb{C}{P}^2$ orientational moduli in the internal space corresponding to their fluxes. The $\mathbb{C}{P}^2$ moduli of two chiral non-Abelian vortices with chiralities opposite to each other are energetically favored to be aligned while those of a vortex and antivortex to be orthogonal, and then these vortices attract each other. They are attached by chiral domain walls in the presence of the mass and axial anomaly terms explicitly breaking axial and chiral symmetries. We numerically show that two chiral non-Abelian vortices with chiralities opposite to each other are connected by a chiral domain wall, consisting a mesonic bound state which is nothing but a non-Abelian semisuperfluid vortex. We also show that Abelian and non-Abelian axial vortices attached by chiral domain walls are all unstable to decay into a set of chiral non-Abelian vortices. Furthermore, we find that chiral non-Abelian vortices exhibit unique features: One is the so-called topological obstruction implying that unbroken symmetry generators in the bulk are not defined globally around the vortices, and the other is color nonsinglet Aharonov-Bohm (AB) phases implying that quarks encircling these vortices can detect the colors of magnetic fluxes of them at infinite distances.

The recently discovered $D_{s0}(2590)$ state by the LHCb collaboration was regarded as the first excited state of ${}^1{S}_0$ charmed-strange meson. Its mass is, however, lower than the Godfrey-Isgur quark model prediction by about 80 MeV. In this work, we take into account the $D^{*}K$ contribution to the bare $c\overline{s}$ state, and show that the coupled-channel interaction induces an 88 MeV shift with respect to the conventional quark model $c\overline{s}$ state, which is much closer to the experimental mass. Our study shows that in addition to $S$-wave, $P$-wave coupled-channel interactions also play a role for hadrons located close to two-hadron thresholds. We further scrutinize the unquenched quark model results with a model independent approach. It is shown that the two-body $D^{*}K$ decay width is proportional to the weight of the $D^{*}K$ component. To saturate the experimental total decay width with the $D^{*}K$ partial decay width we need a weight of about 60% while to reproduce the unquenched quark model result a weight of about 5% is needed. Therefore, we encourage future experimental studies on the two-body $D^{*}K$ partial decay of $D_{s0}(2590)$.