New Solutions To The Bianchi IX Wheeler DeWitt Equation And Leading
Order Solutions For $\Lambda$ $\ne$ 0 And A Primordial **Magnetic** **Field**

**magnetic**

**field**are present, which are also used to construct a leading order wave function. Furthermore we construct leading order 'excited' states which are restricted to the $\beta_+$ axis for the cases when a cosmological constant and a primordial

**magnetic**

**field**are present. To conclude, we discuss the interesting features of our solutions, and point out how the cosmological constant appears to act as a driver of anisotropy in our Bianchi IX models. The Euclidean-signature semi-classical method used here is applicable to certain

**field**theories as well. Because this semi classical method was able to find new solutions to a heavily studied problem the results in this paper represent significant progress in the Wheeler-DeWitt approach to quantum cosmology and in the application of Euclidean-signature semi classical methods to Lorentzian signature problems in general.

8/10 relevant

arXiv

The influence of crosslinkers and **magnetic** particle distribution along
the filament backbone on the magnetic properties of supracolloidal linear
polymer-like chains

**magnetic**filaments (MFs), by applied magnetic

**fields**. Expand abstract.

**magnetic**filaments (MFs), by applied

**magnetic**

**fields**. However, the response of MFs strongly depends on the crosslinking procedure. In the present study, we employ Langevin dynamics simulations to investigate the influence of the type of crosslinking and the distribution of

**magnetic**particles within MFs on their response to an external

**magnetic**

**field**. We found that if the rotation of the dipole moment of particles is not coupled to the backbone of the filament, the impact of the

**magnetic**content is strongly decreased.

7/10 relevant

arXiv

Scaling behavior of Charge order melting in **Magnetic**
**field**-Pressure-Temperature space of 2.5% Al doped Pr$_{0.5}$Ca$_{0.5}$MnO$_3$

**magnetic**measurements across the charge ordering (CO) transition temperature (T$_{CO}$) in polycrystalline Pr$_{0.5}$Ca$_{0.5}$Mn$_{0.975}$Al$_{0.025}$O$_3$ have been performed under simultaneous influence of external hydrostatic pressure (P) and

**magnetic**

**field**(H). We show the first experimental evidence that the melting of charge order instability obey an interesting scaling function, $\delta$T$_{CO}$/P$^\alpha$ = $f$(H/P$^\beta$) in H-P-T landscape, where $\delta$T$_{CO}$ is the suppression of T$_{CO}$ by P and H. Corresponding values of the exponents, $\alpha$ = 1.63 and $\beta$ = 0.33 have been extracted from data collapsing phenomena. Possible origin of such a scaling behavior has been discussed.

7/10 relevant

arXiv

Polarized Line Formation in Arbitrary Strength **Magnetic** **Fields**: the case
of a two-level atom with hyperfine structure splitting

**magnetic**

**fields**via the Hanle, Zeeman, and Paschen-Back effects. In the present paper we solve the problem of polarized line formation in a magnetized atmosphere taking into account scattering in a two-level atom with hyperfine structure splitting together with PFR. To this end we incorporate the collisionless PFR matrix derived in Sowmya et al. (2014) in the polarized transfer equation. We apply the scattering expansion method to solve this transfer equation. We study the combined effects of PFR and Paschen-Back effect on polarized line profiles formed in an isothermal one-dimensional planar atmosphere. For this purpose, we consider the cases of D$_2$ lines of Li\,{\sc i} and Na\,{\sc i}.

10/10 relevant

arXiv

**Magnetic** **Field** Effect in the Fine-Structure Constant and Electron
Dynamical Mass

**magnetic**

**field**, what can be interpreted as an inverse magnetic catalysis effect. Expand abstract.

**magnetic**

**field**in the fine-structure constant of massive and massless QED. In massive QED, it is shown that a strong

**magnetic**

**field**removes the so called Landau pole and that the fine-structure constant becomes anisotropic having different values along and transverse to the

**field**direction. Contrary to other results in the literature, we find that the anisotropic fine-structure constant always decreases with the

**field**. We also study the effect of the running of the coupling constant with the

**magnetic**

**field**on the electron mass. We find that in both cases of massive and massless QED, the electron dynamical mass always decreases with the

**magnetic**field, what can be interpreted as an inverse

**magnetic**catalysis effect.

8/10 relevant

arXiv

Generating Synthetic Magnetism via Floquet Engineering Auxiliary Qubits in Phonon-Cavity-Based Lattice

**magnetic**

**fields**have a close relation to breaking time-reversal symmetry in condensed matter. Expand abstract.

**magnetic**

**fields**have a close relation to breaking time-reversal symmetry in condensed matter. In the present of the gauge fields, we might observe nonreciprocal and topological transport. Inspired by these, there is a growing effort to realize exotic transport phenomena in optical and acoustic systems. However, due to charge neutrality, realizing analog

**magnetic**flux for phonons in nanoscale systems is still challenging in both theoretical and experimental studies. Here we propose a novel mechanism to generate synthetic

**magnetic**

**field**for phonon lattice by Floquet engineering auxiliary qubits. We find that, a longitudinal Floquet drive on the qubit will produce a resonant coupling between two detuned acoustic cavities. Specially, the phase encoded into the longitudinal drive can exactly be transformed into the phonon-phonon hopping. Our proposal is general and can be realized in various types of artificial hybrid quantum systems. Moreover, by taking surface-acoustic-wave (SAW) cavities for example, we propose how to generate synthetic

**magnetic**flux for phonon transport. In the present of synthetic

**magnetic**flux, the time-reversal symmetry will be broken, which allows to realize the circulator transport and analog Aharonov-Bohm effects for acoustic waves. Last, we demonstrate that our proposal can be scaled to simulate topological states of matter in quantum acoustodynamics system.

7/10 relevant

arXiv

(111)-oriented, single crystal diamond tips for nanoscale scanning probe
imaging of out-of-plane **magnetic** **fields**

**magnetic**

**field**imaging with nanoscale resolution, where the measurement axis is oriented normal to the scan plane. Expand abstract.

**magnetic**

**field**imaging with nanoscale resolution, where the measurement axis is oriented normal to the scan plane. We discuss how these tips bring multiple practical advantages for NV magnetometry, in particular regarding quantitative analysis of the resulting data. We further demonstrate the beneficial optical properties of NVs oriented along the tip direction, such as polarization-insensitive excitation, which simplifies optical setups needed for NV magnetometry. Our results will be impactful for scanning NV magnetometry in general and for applications in spintronics and the investigation of thin film magnets in particular.

9/10 relevant

arXiv

Fast relaxation on **magnetic**-dipole-forbidden spin transitions of
nitrogen-vacancy centers in nanodiamonds

**magnetic**-dipole-forbidden transitions between the $m_s = \pm1$ spin states of the NV- electronic ground state in ~40-nm nanodiamonds under ambient conditions. For frequency splittings between the $\pm1$ states of ~20 MHz or less the maximum achievable coherence time of the NV spin is ~2 orders of magnitude shorter than would be expected based on the lifetime of the $m_s = 0$ state. We attribute this fast relaxation to electric

**field**noise. We observe a strong falloff of the relaxation rate with the splitting between $\pm1$, suggesting that, whenever possible, measurements with NVs in nanodiamonds should be performed at moderate axial

**magnetic**

**fields**(> 60 G). We also observe that the relaxation rate changes with time. These findings indicate that surface electric

**field**noise is a major source of decoherence for NVs in nanodiamonds.

4/10 relevant

arXiv

Weak decays of magnetized charged pions in the symmetric gauge

**magnetic**field, using the symmetric gauge. The consequences of the axial symmetry of the problem and the issue of angular momentum conservation are discussed in detail. In particular, we analyze the projection of both the canonical and the mechanical total angular momenta along the direction of the

**magnetic**

**field**. It is found that while the former is conserved in the symmetric gauge, the latter is not conserved in both the symmetric and Landau gauges. We derive an expression for the integrated $\pi^- \to l \, \bar{\nu}_l$ width that coincides exactly with the one found using the Landau gauge in Ref. \cite{Coppola:2018ygv}, providing an explicit test of the gauge independence of that result. Such an expression implies that for nonzero

**magnetic**

**fields**the decay width does not vanish in the limit in which the outgoing charged leptons are massless, i.e.\ it does not exhibit the helicity suppression found in the case of no external

**field**.

7/10 relevant

arXiv

Average **field** approximation for almost bosonic anyons in a **magnetic**
field

**magnetic**

**field**. We consider a scaling limit where the statistics parameter $\alpha$ tends to zero when N tends to infinity which allows the statistics to be seen as a "perturbation from the bosonic end". Our model is that of bosons in a

**magnetic**

**field**and interacting through long-range

**magnetic**potential generated by

**magnetic**charges carried by each particle, smeared over discs of radius R. Our method allows to take R tends to not too fast at the same time as N tends to infinity. We use the information theoretic version of the de Finetti theorem of Brand{\~a}o and Harrow to justify the so-called "average

**field**approximation": the particles behave like independent, identically distributed bosons interacting via a self-consistent

**magnetic**

**field**.

8/10 relevant

arXiv