Wed·Sep 29, 2021Wednesday·September 29, 2021

1. 01*

   Updating ${\nu }_3$ lifetime from solar antineutrino spectra

   R. Picoreti🇧🇷 · D. Pramanik🇧🇷 · P. C. de Holanda🇧🇷 · O. L. G. Peres

   We study the production of antineutrinos from the solar neutrinos due the Majorana neutrino decays of neutrino to antineutrino. Using the antineutrino spectra from KamLAND and Borexino, we present newest limits on the lifetime of ${\nu }_3$ in this scenario. We consider ${\nu }_3\to {\bar{\nu }}_1+X$ and ${\nu }_3\to {\bar{\nu }}_2+X$ channels assuming scalar or pseudo-scalar interactions. For hierarchical mass-splittings, the limits obtained by us are ${\tau }_3/m_3\ge 7\times 10^{-5}s/eV$ and ${\tau }_3/m_3\ge 1\times 10^{-5}s/eV$ for the two channels at $90\%$ C.L. We found that the newest bound is five orders of magnitude better than the atmospheric and long-baseline bounds.

   hep-phPRD(2022)·19 citations
2. 02*

   Freeze-in from Preheating

   Marcos A. G. Garcia🇪🇸 · Kunio Kaneta🇯🇵 · Yann Mambrini🇫🇷 · Keith A. Olive🇺🇸 · Sarunas Verner🇺🇸

   We consider the production of dark matter during the process of reheating after inflation. The relic density of dark matter from freeze-in depends on both the energy density and energy distribution of the inflaton scattering or decay products composing the radiation bath. We compare the perturbative and non-perturbative calculations of the energy density in radiation. We also consider the (likely) possibility that the final state scalar products are unstable. Assuming either thermal or non-thermal energy distribution functions, we compare the resulting relic density based on these different approaches. We show that the present-day cold dark matter density can be obtained through freeze-in from preheating for a large range of dark matter masses.

   hep-phastro-ph.COJCAP(2022)·70 citations
3. 03*

   On the road(s) to the Standard Model

   Rodrigo Alonso🇬🇧 · Mia West🇬🇧

   Experimental measurements point at the Standard Model (SM) as the theory of electroweak symmetry breaking, but as we close in on our characterization the question arises of what limits in theory space lead to the SM. The class of theories with this property cannot be ruled out, only constrained to an ever smaller neighbourhood of the SM. In contrast, which class of theories do not posses this limit and can therefore potentially be ruled out experimentally? In this work we study both classes and find evidence to support the Standard Model Effective field theory being the single road to the Standard Model, theories that fall outside this class keeping a `minimum distance' from the SM characterized by a cut-off of at most $4\pi v/g_{\mathrm{SM}}$.

   hep-phPRD(2022)·50 citations
4. 04*

   Consistent approach to study gluon quasi-particles

   Chowdhury Aminul Islam🇨🇳 · Munshi G. Mustafa🇮🇳 · Rajarshi Ray🇮🇳 · Pracheta Singha🇮🇳

   We discuss a novel approach to estimate the partition function in effective model frameworks when the effective potentials have multiple extrema, so that ascertaining a mean field becomes difficult. Using this approach we present a consistent model to study the thermodynamic properties of gluon quasi-particles as a function of temperature, both in the color confined and the color deconfined phases.

   hep-phhep-latnucl-thPRD(2022)·7 citations
5. 05*

   Constraining anomalous Higgs boson couplings to virtual photons

   Jeffrey Davis🇺🇸 · Andrei V. Gritsan🇺🇸 · Lucas S. Mandacaru Guerra🇺🇸 · Savvas Kyriacou🇺🇸 · Jeffrey Roskes🇺🇸 · Markus Schulze🇩🇪

   We present a study of Higgs boson production in vector boson fusion and in association with a vector boson and its decay to two vector bosons, with a focus on the treatment of virtual loops and virtual photons. Our analysis is performed with the JHU generator framework. Comparisons are made to several other frameworks, and the results are expressed in terms of an effective field theory. New features of this study include a proposal on how to handle singularities involving Higgs boson decays to light fermions via photons, calculation of the partial Higgs boson width in the presence of anomalous couplings to photons, a comparison of the next-to-leading-order electroweak corrections to effects from effective couplings, and phenomenological observations regarding the special role of intermediate photons in analysis of LHC data in the effective field theory framework. Some of these features are illustrated with projections for experimental measurements with the full LHC and HL-LHC datasets.

   hep-phhep-exPRD(2022)·30 citations
6. 06*

   Comment on "Accumulating Evidence for the Associate Production of a Neutral Scalar with Mass around 151 GeV"

   Andrew Fowlie🇨🇳

   A recent paper [2109.02650] accumulates evidence for a new fundamental particle by combining several CMS and ATLAS searches for the Standard Model Higgs boson. The putative particle is a neutral scalar, $S$, with a mass of about 151 GeV. The reported significances are $5.1\sigma$ local and $4.8\sigma$ global. This nearly reaches the $5\sigma$ threshold for a discovery in high-energy physics. In this brief note we cast doubt on the strength of the evidence for a new particle. After taking into account the fact that signals were fitted to six different channels, we find that the significances are only $4.1\sigma$ local and $3.5\sigma$ global. The code and instructions for reproducing our calculations are available at https://github.com/andrewfowlie/accumulating_evidence.

   hep-phphysics.data-anPLB(2022)·8 citations
7. 07*

   Scattering of low energy neutrinos and antineutrinos by atomic electrons

   Ian B. Whittingham🇦🇺

   Studies of neutrino mixing and oscillations, solar neutrinos as background in dark matter searches involving electron detection, detection of sterile neutrino warm dark matter, and of possible electromagnetic properties of neutrinos, have generated interest in the low energy O(10 keV) scattering of electron neutrinos and antineutrinos by atomic electrons where the binding of the atomic electron cannot be ignored. Of particular interest is the ionization of atoms by neutrinos and antineutrinos. Most existing calculations are based on modifications of the free electron differential cross section, which destroy the relationship between the neutrino helicities and the orbital and spin angular momenta of the atomic electrons. The present calculations maintain the full collision dynamics by formulating the scattering in configuration space using the Bound Interaction Picture, rather than the usual formulation in the Interaction Picture in momentum space as appropriate to scattering by free electrons. Energy spectra of ionization electrons produced by scattering of neutrinos and antineutrinos with energies of 5, 10, 20, and 30 keV by hydrogen, helium and neon have been calculated using Dirac central field eigenfunctions and are presented as ratios to the spectra for scattering by free electrons. Binding effects increase strongly with atomic number, are largest for low neutrino energy and, for each neutrino energy, greatest at the high electron energy end of the spectrum. The most extreme effects of binding are for 5 keV scattering by Ne where the ratios are less than 0.1. The energy spectra are calculated for both a Coulombic final electron state and a free final electron state. The results indicate that the binding effects from the continuum state of the final electron are significant and can be comparable to those arising from the bound initial electron state.

   hep-phPRD(2022)·5 citations
8. 08*

   Nuclear-Level Effective Theory of $\mu \to e$ Conversion

   Evan Rule · W. C. Haxton · Ken McElvain

   The Mu2e and COMET $\mu \to e$ conversion experiments are expected to significantly advance limits on new sources of charged lepton flavor violation (CLFV). Almost all theoretical work in the field has focused on just two operators. However, general symmetry arguments lead to a $\mu \to e$ conversion rate with six response functions, each of which, in principle, is observable by varying nuclear properties of targets. We construct a nucleon-level nonrelativistic effective theory (NRET) to clarify the microscopic origin of these response functions and to relate rate measurements in different targets. This exercise identifies three operators and their small parameters that control the NRET operator expansion. We note inconsistencies in past treatments of these parameters. The NRET is technically challenging, involving 16 operators, several distorted electron partial waves, bound muon upper and lower components, and an exclusive nuclear matrix element. We introduce a trick for treating the electron Coulomb effects accurately, which enables us to include all of these effects while producing transition densities whose one-body matrix elements can be evaluated analytically, greatly simplifying the nuclear physics. We derive bounds on operator coefficients from existing and anticipated $\mu \to e$ conversion experiments. We discuss how similar NRET formulations have impacted dark matter phenomenology, noting that the tools this community has developed could be adapted for CLFV studies.

   hep-phnucl-thPRL(2023)·23 citations
9. 09*

   Collider Searches for Dark Matter through the Higgs Lens

   Spyros Argyropoulos🇩🇪 · Oleg Brandt🇬🇧 · Ulrich Haisch🇩🇪

   Despite the fact that dark matter constitutes one of the cornerstones of the standard cosmological paradigm, its existence has so far only been inferred from astronomical observations and its microscopic nature remains elusive. Theoretical arguments suggest that dark matter might be connected to the symmetry-breaking mechanism of the electroweak interactions or of other symmetries extending the Standard Model of particle physics. The resulting Higgs bosons, including the $125\mathrm{GeV}$ spin-0 particle discovered recently at the Large Hadron Collider therefore represent a unique tool to search for dark matter candidates at collider experiments. This article reviews some of the relevant theoretical models as well as the results from the searches for dark matter in signatures that involve a Higgs-like particle at the Large Hadron Collider.

   hep-phhep-exSymmetry(2021)·46 citations
10. 10*

    Next-to-Leading-Order QCD Matching for $\Delta F=2$ Processes in Scalar Leptoquark Models

    Andreas Crivellin🇨🇭 · Jordi Folch Eguren🇪🇸 · Javier Virto🇪🇸

    Leptoquarks provide viable solutions to the flavour anomalies, i.e. they can explain the tensions between the measurements and the Standard Model predictions of the anomalous magnetic moment of the muon as well as $b\to s{\ell }^{+}{\ell }^{-}$ and $b\to c\tau \nu$ processes. However, leptoquarks also contribute to other flavour observables, such as $\Delta F=2$ processes, at the loop-level. In particular, $B_s-{\bar{B}}_s$ mixing provides a crucial bound in setups addressing $b\to c\tau \nu$ data, often excluding a big portion of the parameter space that could otherwise account for it. In this article, we first derive the complete leading order matching, including all five scalar LQ representations, for $D^0-{\bar{D}}^0$, $K^0-{\bar{K}}^0$ and $B_{s,d}-{\bar{B}}_{s,d}$ mixing (at the dimension-six level). We then calculate the next-to-leading order ${\alpha }_s$ matching corrections to these $\Delta F=2$ processes in generic scalar leptoquark models. We find that the two-loop corrections increase the effects in $\Delta F=2$ processes by $\sim 5$-$10\%$ and significantly reduce the matching scale uncertainty.

    hep-phhep-exhep-latJHEP(2022)·11 citations
11. 11*

    Non-adiabatic evolution of dark sector in the presence of $U(1{)}_{L_{\mu }-L_{\tau }}$ gauge symmetry

    Ananya Tapadar🇮🇳 · Sougata Ganguly🇮🇳 · Sourov Roy🇮🇳

    In secluded dark sector scenario, the connection between the visible and the dark sector can be established through a portal coupling and its presence opens up the possibility of non-adiabatic evolution of the dark sector. To study the non-adiabatic evolution of the dark sector, we have considered a $U(1{)}_{L_{\mu }-L_{\tau }}\otimes U(1{)}_X$ extension of the standard model (SM). Here the dark sector is charged only under $U(1{)}_X$ gauge symmetry whereas the SM fields are singlet under this symmetry. Due to the presence of tree-level kinetic mixing between $U(1{)}_X$ and $U(1{)}_{L_{\mu }-L_{\tau }}$ gauge bosons, the dark sector evolves non-adiabatically and thermal equilibrium between the visible and dark sector is governed by the portal coupling. Depending on the values of the portal coupling ($ϵ$), dark sector gauge coupling ($g_X$), mass of the dark matter ($m_{\chi }$) and mass of the dark vector boson ($m_{Z^{\prime }}$), we study the temperature evolution of the dark sector as well as the various non-equilibrium stages of the dark sector in detail. Furthermore we have also investigated the constraints on the model parameters from various laboratory and astrophysical searches. We have found that the parameter space for the non-adiabatic evolution of dark sector is significantly constrained for $m_{Z^{\prime }}$ $\lesssim 100\mathrm{MeV}$ from the observations of beam dump experiments, stellar cooling etc. The relic density satisfied region of our parameter space is consistent with the bounds from direct detection, and self interaction of dark matter (SIDM) for the mass ratio $r\equiv m_{Z^{\prime }}/m_{\chi }=10^{-3}$ and these bounds will be more relaxed for larger values of $r$. However the constraints from measurement of diffuse $\gamma$-ray background flux and cosmic microwave background (CMB) anisotropy are strongest for $r=10^{-1}$ and for smaller values of $r$, they are not significant.

    hep-phJCAP(2022)·10 citations
12. 12*

    Non-unitary Leptonic Flavor Mixing and CP Violation in Neutrino-antineutrino Oscillations

    Yilin Wang🇨🇳 · Shun Zhou🇨🇳

    If massive neutrinos are Majorana particles, then the lepton number should be violated in nature and neutrino-antineutrino oscillations ${\nu }_{\alpha }^{}\leftrightarrow {\overline{\nu }}_{\beta }^{}$ (for $\alpha ,\beta =e,\mu ,\tau$) will definitely take place. In the present paper, we study the properties of CP violation in neutrino-antineutrino oscillations with the non-unitary leptonic flavor mixing matrix, which is actually a natural prediction in the canonical seesaw model due to the mixing between light and heavy Majorana neutrinos. The oscillation probabilities $P({\nu }_{\alpha }^{}\to {\overline{\nu }}_{\beta }^{})$ and $P({\overline{\nu }}_{\alpha }^{}\to {\nu }_{\beta }^{})$ are derived, and the CP asymmetries ${\mathcal{A}}_{\alpha \beta }^{}\equiv [P({\nu }_{\alpha }^{}\to {\overline{\nu }}_{\beta }^{})-P({\overline{\nu }}_{\alpha }^{}\to {\nu }_{\beta }^{})]/[P({\nu }_{\alpha }^{}\to {\overline{\nu }}_{\beta }^{})+P({\overline{\nu }}_{\alpha }^{}\to {\nu }_{\beta }^{})]$ are also calculated. Taking into account current experimental bounds on the leptonic unitarity violation, we show that the CP asymmetries induced by the non-unitary mixing parameters can significantly deviate from those in the limit of a unitary leptonic flavor mixing.

    hep-phPLB(2022)·27 citations
13. 13*

    Bubble wall velocities in local equilibrium

    Wen-Yuan Ai🇧🇪 · Bjorn Garbrecht🇩🇪 · Carlos Tamarit🇩🇪

    It is commonly expected that a friction force on the bubble wall in a first-order phase transition can only arise from a departure from thermal equilibrium in the plasma. Recently however, it was argued that an effective friction, scaling as ${\gamma }_w^2$ (with ${\gamma }_w$ being the Lorentz factor for the bubble wall velocity), persists in local equilibrium. This was derived assuming constant plasma temperature and velocity throughout the wall. On the other hand, it is known that, at the leading order in derivatives, the plasma in local equilibrium only contributes a correction to the zero-temperature potential in the equation of motion of the background scalar field. For a constant plasma temperature, the equation of motion is then completely analogous to the vacuum case, the only change being a modified potential, and thus no friction should appear. We resolve these apparent contradictions in the calculations and their interpretation and show that the recently proposed effective friction in local equilibrium originates from inhomogeneous temperature distributions, such that the ${\gamma }_w^2$-scaling of the effective force is violated. Further, we propose a new matching condition for the hydrodynamic quantities in the plasma valid in local equilibrium and tied to local entropy conservation. With this added constraint, bubble velocities in local equilibrium can be determined once the parameters in the equation of state are fixed, where we use the bag equation in order to illustrate this point. We find that there is a critical value of the transition strength ${\alpha }_{\mathrm{crit}}$ such that bubble walls run away for $\alpha >{\alpha }_{\mathrm{crit}}$.

    hep-phhep-thJCAP(2022)·125 citations
14. 14*

    A ChPT estimate of the strong-isospin-breaking contribution to the anomalous magnetic moment of the muon

    Christopher L. James🇨🇦 · Randy Lewis🇨🇦 · Kim Maltman🇨🇦

    First-principles lattice determinations of the Standard Model expectation for the leading order hadronic vacuum polarization contribution to the anomalous magnetic moment of the muon have become sufficiently precise that further improvement requires including strong and electromagnetic isospin-breaking effects. We provide a continuum estimate of the strong isospin-breaking contribution, $a_{\mu }^{SIB}$, using $SU(3)$ chiral perturbation theory. The result is shown to be dominated by resonance-region contributions encoded in a single low-energy constant whose value is known from flavor-breaking hadronic $\tau$ decay sum rules. Implications of the form of the result for lattice determinations of $a_{\mu }^{SIB}$ are also discussed.

    hep-phhep-latPRD(2022)·17 citations
15. 15*

    Zee-Babu model in modular $A_4$ symmetry

    Hiroshi Okada🇰🇷 · Yong-hui Qi🇰🇷

    We study a Zee-Babu model in a modular $A_4$ flavor symmetry, in which we search for several predictions such as phases, sum of neutrino masses, and neutrinoless double beta decay, satisfying neutrino oscillation data in a minimum framework of the charge assignments of modular weight. We perform $\Delta {\chi }^2$ analysis to get our results and find $\tau$ is localized nearby at one of the fixed points of $i\times \infty$ for both of normal and inverted mass hierarchies.

    hep-ph23 citations
16. 16*

    X (3872) as a Universal and Composite State

    B. Kabirimanesh🇮🇷 · H. Mehraban🇮🇷

    X (3872) because of its mass that is just below D^0 D-^0* threshold and its quantum number j^pc=1^++ can be considered as a weakly bound molecule. It can be regarded as a non-relativistic system depicting universality and compositeness. Physical observables are called universal if they are insensitive to the range and other details of short-range interaction. Weinberg introduced compositeness criterion to classify a two-body composite system as the sum, with different weights, of a compact core and two distinct parts.

    hep-ph0 citations
17. 17*

    Axion Fragmentation on the Lattice

    Enrico Morgante🇩🇪 · Wolfram Ratzinger🇩🇪 · Ryosuke Sato🇨🇳 · Ben A. Stefanek🇨🇭

    We analyze the phenomenon of axion fragmentation when an axion field rolls over many oscillations of a periodic potential. This is particularly relevant for the case of relaxion, in which fragmentation provides the necessary energy dissipation to stop the field evolution. We compare the results of a linear analysis with the ones obtained from a classical lattice simulation, finding an agreement in the stopping time of the zero mode between the two within an $\mathcal{O}(1)$ difference. We finally speculate on the generation of bubbles with different VEVs of the axion field, and discuss their cosmological consequences.

    hep-phJHEP(2021)·32 citations
18. 18*

    Annihilogenesis

    Jason Arakawa🇺🇸 · Arvind Rajaraman🇺🇸 · Tim M.P. Tait🇺🇸

    We investigate a novel interplay between the decay and annihilation of a particle whose mass undergoes a large shift during a first order phase transition, leading to the particles becoming trapped in the false vacuum and enhancing their annihilation rates as the bubbles of true vacuum expand. This opens up a large region of the parameter space where annihilations can be important. We apply this scenario to baryogenesis, where we find that annihilations can be enhanced enough to generate the requires baryon asymmetry even for relatively tiny annihilation cross sections with modest CP asymmetries.

    hep-phJHEP(2022)·21 citations
19. 19*

    Scalarized neutron stars in massive scalar-tensor gravity: X-ray pulsars and tidal deformability

    Zexin Hu🇨🇳 · Yong Gao🇨🇳 · Rui Xu🇨🇳 · Lijing Shao🇨🇳

    Neutron stars (NSs) in scalar-tensor theories of gravitation with the phenomenon of spontaneous scalarization can develop significant deviations from general relativity. Cases with a massless scalar were studied widely. Here we compare the NS scalarizations in the Damour--Esposito-Farèse theory, the Mendes-Ortiz theory, and the $\xi$-theory with a massive scalar field. Numerical solutions for slowly rotating NSs are obtained. They are used to construct the X-ray pulse profiles of a pair of extended hot spots on the surface of NSs. We also calculate the tidal deformability for NSs with spontaneous scalarization which is done for the first time with a massive scalar field. We show the universal relation between the moment of inertia and the tidal deformability. The X-ray pulse profiles, the tidal deformability, and the universal relation may help to constrain the massive scalar-tensor theories in X-ray and gravitational-wave observations of NSs, including the Neutron star Interior Composition Explorer (NICER) satellite, Square Kilometre Array (SKA) telescope, and LIGO/Virgo/KAGRA laser interferometers.

    ↳ gr-qcastro-ph.HEhep-phPRD(2021)·31 citations
20. 20*

    Evolution of primordial magnetic fields during large-scale structure formation

    Salome Mtchedlidze🇬🇪 · Paola Domínguez-Fernández🇩🇪 · Xiaolong Du🇺🇸 · Axel Brandenburg🇸🇪 · Tina Kahniashvili🇺🇸 · Shane O'Sullivan🇮🇪 · Wolfram Schmidt🇩🇪 · Marcus Brüggen🇩🇪

    Primordial magnetic fields could explain the large-scale magnetic fields present in the Universe. Inflation and phase transitions in the early Universe could give rise to such fields with unique characteristics. We investigate the magneto-hydrodynamic evolution of these magnetogenesis scenarios with cosmological simulations. We evolve inflation-generated magnetic fields either as (i) uniform (homogeneous) or as (ii) scale-invariant stochastic fields, and phase transition-generated ones either as (iii) helical or as (iv) non-helical fields from the radiation-dominated epoch. We find that the final distribution of magnetic fields in the simulated cosmic web shows a dependence on the initial strength and the topology of the seed field. Thus, the observed field configuration retains information on the initial conditions at the moment of the field generation. If detected, primordial magnetic field observations would open a new window for indirect probes of the early universe. The differences between the competing models are revealed on the scale of galaxy clusters, bridges, as well as filaments and voids. The distinctive spectral evolution of different seed fields produces imprints on the correlation length today. We discuss how the differences between rotation measures from highly ionized regions can potentially be probed with forthcoming surveys.

    ↳ astro-ph.COastro-ph.GAastro-ph.HEhep-ph+1ApJ(2022)·37 citations
21. 21*

    Effective actions and bubble nucleation from holography

    Fëanor Reuben Ares🇫🇮 · Oscar Henriksson🇫🇮 · Mark Hindmarsh🇫🇮 · Carlos Hoyos🇪🇸 · Niko Jokela🇫🇮

    We discuss the computation of the quantum effective action of strongly interacting field theories using holographic duality, and its use to determine quasi-equilibrium parameters of first order phase transitions relevant for gravitational wave production. A particularly simple holographic model is introduced, containing only the metric and a free massive scalar field. Despite the simplicity, the model contains a rich phase diagram, including first order phase transitions at non-zero temperature, due to various multi-trace deformations. We obtain the leading terms in the effective action from homogeneous black brane solutions in the gravity dual, and linearised perturbations around them. We then employ the effective action to construct bubble and domain wall solutions in the field theory side and study their properties. In particular, we show how the scaling of the effective action with the effective number of degrees of freedom of the quantum field theory determines the corresponding scaling of gravitational wave parameters.

    ↳ hep-thastro-ph.COgr-qchep-phPRD(2022)·48 citations
22. 22*

    Causality, Unitarity, and the Weak Gravity Conjecture

    Nima Arkani-Hamed🇺🇸 · Yu-tin Huang🇹🇼 · Jin-Yu Liu🇹🇼 · Grant N. Remmen🇺🇸

    We consider the shift of charge-to-mass ratio for extremal black holes in the context of effective field theory, motivated by the Weak Gravity Conjecture. We constrain extremality corrections in different regimes subject to unitarity and causality constraints. In the asymptotic IR, we demonstrate that for any supersymmetric theory in flat space, and for all minimally coupled theories, logarithmic running at one loop pushes the Wilson coefficient of certain four-derivative operators to be larger at lower energies, guaranteeing the existence of sufficiently large black holes with $Q>M$. We identify two exceptional cases of nonsupersymmetric theories involving large numbers of light states and Planck-scale nonminimal couplings, in which the sign of the running is reversed, leading to black holes with negative corrections to $Q/M$ in the deep IR, but argue that these do not rule out extremal black holes as the requisite charged states for the WGC. We separately show that causality and unitarity imply that the leading threshold corrections to the effective action from integrating out massive states, in any weakly coupled theory, can be written as a sum of squares and is manifestly positive for black hole backgrounds. Quite beautifully, the shift in the extremal $Q/M$ ratio is directly proportional to the shift in the on-shell action, guaranteeing that these threshold corrections push $Q>M$ in compliance with the WGC. Our results apply for black holes with or without dilatonic coupling and charged under any number of $\mathrm{U}(1)$s.

    ↳ hep-thgr-qchep-phJHEP(2022)·131 citations
23. 23*

    Dense matter equation of state and phase transitions from a Generalized Skyrme model

    Christoph Adam🇪🇸 · Alberto Garcia Martin-Caro🇪🇸 · Miguel Huidobro🇪🇸 · Ricardo Vazquez🇪🇸 · Andrzej Wereszczynski🇵🇱

    Skyrmion crystals are the field configurations which minimize the energy per baryon in the infinitely large topological charge sector of the Skyrme model, at least for sufficiently high density. They are, therefore, an important tool to describe the ground state of cold, symmetric nuclear matter at high density regimes. In this work, we analyze different crystalline phases and the existence of phase transitions between them within the generalized Skyrme model, with the ultimate goal of describing symmetric nuclear matter in a wide regime of densities. Furthermore, we propose a new energy-minimizing phase for densities lower than the nuclear saturation point ($n_0$) which also presents a good qualitative behavior in the zero density limit, thereby improving the description of strongly interacting matter in the region $n<n_0$.

    ↳ hep-thhep-phnucl-thPRD(2022)·15 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.