Nuclear Theory·nucl-th

Tuesday·June 22, 2021

19 papers—6 primary·13 cross-listed

07
[Submitted on 18 Jun 2021] (cross-list from hep-ph)
Feeble DM-SM Interaction via New Scalar and Vector Mediators in Rotating Neutron Stars
Atanu Guha🇮🇳 · Debashree Sen🇮🇳
We investigate the possible presence of dark matter (DM) in massive and rotating neutron stars (NSs). For the purpose we extend our previous work [1] to introduce a light new physics vector mediator besides a scalar one in order to ensure feeble interaction between fermionic DM and $β$ stable hadronic matter in NSs. The masses of DM fermion, the mediators and the couplings are chosen consistent with the self-interaction constraint from Bullet cluster and from present day relic abundance. Assuming that both the scalar and vector mediators contribute equally to the relic abundance, we compute the equation of state (EoS) of the DM admixed NSs to find that the present consideration of the vector new physics mediator do not bring any significant change to the EoS and static NS properties of DM admixed NSs compared to the case where only the scalar mediator was considered [1]. However, the obtained structural properties in static conditions are in good agreement with the various constraints on them from massive pulsars like PSR J0348+0432 and PSR J0740+6620, the gravitational wave (GW170817) data and the recently obtained results of NICER experiments for PSR J0030+0451 and PSR J0740+6620. We also extended our work to compute the rotational properties of DM admixed NSs rotating at different angular velocities. The present results in this regard suggest that the secondary component of GW190814 may be a rapidly rotating massive DM admixed NS. The constraints on rotational frequency from pulsars like PSR B1937+21 and PSR J1748-2446ad are also satisfied by our present results. Also, the constraints on moment of inertia are satisfied considering slow rotation. The universality relation in terms of normalized moment of inertia also holds good with our DM admixed EoS.
Comments:
20 Pages, 8 figures, Accepted for Publication in JCAP
Subjects:
High Energy Physics — Phenomenology (hep-ph); Cosmology and Nongalactic Astrophysics (astro-ph.CO); High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Theory (nucl-th)
arXiv:
2106.10353 [pdf]
JCAP(2021)·39 citations
08
[Submitted on 18 Jun 2021] (cross-list from nucl-ex)
Charge Radius of Neutron-deficient $^{54}$ Ni and Symmetry Energy Constraints Using the Difference in Mirror Pair Charge Radii
Skyy V. Pineda🇺🇸 · Kristian König🇺🇸 · Dominic M. Rossi🇩🇪 · B. Alex Brown🇺🇸 · Anthony Incorvati🇺🇸 · Jeremy Lantis🇺🇸 · Kei Minamisono🇺🇸 · Wilfried Nörtershäuser🇩🇪 · Jorge Piekarewicz🇺🇸 · Robert Powel🇺🇸 · Felix Sommer🇩🇪
The nuclear root-mean-square charge radius of $^{54}$ Ni was determined with collinear laser spectroscopy to be $R (^{54}$ Ni) = 3.737\,(3)~fm. In conjunction with the known radius of the mirror nucleus $^{54}$ Fe, the difference of the charge radii was extracted as $Δ R_{ch}$ = 0.049\,(4)~fm. Based on the correlation between $Δ R_{ch}$ and the slope of the symmetry energy at nuclear saturation density ( $L$ ), we deduced $20 \leq L \leq 70$ \,MeV. The present result is consistent with the $L$ from the binary neutron star merger GW170817, favoring a soft neutron matter EOS, and barely consistent with the PREX-2 result within 1 $σ$ error bands. Our result indicates the neutron-skin thickness of $^{48}$ Ca as 0.15\,-\,0.19\,fm.
Comments:
6 total pages, 3 figures
Subjects:
Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2106.10378 [pdf]
PRL(2021)·80 citations
09
[Submitted on 19 Jun 2021] (cross-list from hep-ph)
Is two-poles' $Λ (1405)$ one state or two?
Zhong-Yu Wang🇨🇳 · Hiwa A. Ahmed🇨🇳 · C. W. Xiao🇨🇳
To understand the nature of two poles for the $Λ (1405)$ state, we revisit the interactions of $K ˉ N$ and $π Σ$ with their coupled channels, where two-poles structure is found in the second Riemann sheet. We also dynamically generate two poles in the single channel interaction of $K ˉ N$ and $π Σ$ , respectively. Moreover, we make a further study of two poles' properties by evaluating the couplings, the compositeness, the wave functions, and the radii for the interactions of four coupled channels, two coupled channels and the single channel. Our results show that the nature of two poles is unique. The higher-mass pole is a pure $K ˉ N$ molecule, and the lower-mass one is a compositeness of mainly $π Σ$ with tiny component $K ˉ N$ . From our results, one can conclude that the $Λ (1405)$ state would be overlapped with two different states of the same quantum number.
Comments:
Some tiny corrections have been made. Welcome for more comments
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2106.10511 [pdf]
EPJC(2021)·11 citations
10
[Submitted on 20 Jun 2021] (cross-list from hep-ph)
Study of $N (1440)$ structure via $γ^{*} p \to N (1440)$ transition
A. Kaewsnod🇹🇭 · K. Xu🇹🇭 · Z. Zhao🇹🇭 · X. Y. Liu🇹🇭 · S. Srisuphaphon🇹🇭 · A. Limphirat🇹🇭 · Y. Yan🇹🇭
We study the photoproduction of the $N (1440)$ resonance in $γ^{*} p \to N^{*}$ process in quark models, where the $N (1440)$ takes different wave functions: first radial excitation of the nucleon imported from low-lying baryon mass spectrum calculations, a general radial excitation of the nucleon, and a $q^{3}$ state with positive parity. The comparison between the theoretical results and experimental data on the helicity amplitudes $A_{1/2}$ and $S_{1/2}$ and the analysis of the spatial wave function of the $N (1440)$ resonance reveal that the $N (1440)$ resonance is mainly the $q^{3}$ first radial excitation.
Comments:
6 pages, 5 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2106.10615 [pdf]
PRD(2022)·6 citations
11
[Submitted on 20 Jun 2021] (cross-list from hep-ph)
Semileptonic decays $D \to η π e^{+} ν_{e}$ in the $a_{0} (980)$ region
N.N. Achasov🇷🇺 · A.V. Kiselev🇷🇺 · G.N. Shestakov🇷🇺
The mechanism of the four-quark production of the light scalar isovector four-quark state $a_{0} (980)$ in the $D \to η π e^{+} ν_{e}$ decays is discussed. It is shown that the characteristic features of the shape of the $η π$ mass spectra expected in our scheme can serve as the indicator of the production mechanism and internal structure of the $a_{0} (980)$ resonance.
Comments:
11 pages, 11 figures, v2: clarifications added, version published in Phys. Rev. D
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
arXiv:
2106.10670 [pdf]
PRD(2021)·13 citations
12
[Submitted on 21 Jun 2021] (cross-list from hep-ph)
Accessing Topological Fluctuations of Gauge Fields with Chiral Magnetic Effect
Anping Huang🇨🇳 · Shuzhe Shi🇨🇦 · Shu Lin🇨🇳 · Xingyu Guo🇨🇳 · Jinfeng Liao🇺🇸
Gauge fields provide the fundamental interactions in the Standard Model of particle physics. Gauge field configurations with nontrivial topological windings are known to play crucial roles in many important phenomena, from matter-anti-matter asymmetry of today's universe to spontaneous chiral symmetry breaking in strong interaction. Their presence is however elusive for direct detection in experiments. Here we show that measurements of the chiral magnetic effect (CME) in heavy ion collisions can be used for accessing the topological fluctuations of the non-Abelian gauge fields in the Quantum Chromodynamics (QCD). To achieve this, we implemented a key ingredient, the stochastic dynamics of gauge field topological fluctuations, into a state-of-the-art framework for simulating the CME in these collisions. This new framework provides the necessary tool to quantify initial topological fluctuations from any definitive CME signal to be extracted from experimental data. It also reveals a universal scaling relation between initial topological fluctuations and particle multiplicity produced in the corresponding collision events.
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2106.10847 [pdf]
PRD(2023)·3 citations
13
[Submitted on 21 Jun 2021] (cross-list from quant-ph)
Filtering states with total spin on a quantum computer
Pooja Siwach🇮🇳 · Denis Lacroix🇫🇷
Starting from a general wave function described on a set of spins/qubits, we propose several quantum algorithms to extract the components of this state on eigenstates of the total spin $S^{2}$ and its azimuthal projection $S_{z}$ . The method plays the role of total spin projection and gives access to the amplitudes of the initial state on a total spin basis. The different algorithms have various degrees of sophistication depending on the requested tasks. They can either solely project onto the subspace with good total spin or completely uplift the degeneracy in this subspace. After each measurement, the state collapses to one of the spin eigenstates that could be used for post-processing. For this reason, we call the method Total Quantum Spin filtering (TQSf). Possible applications ranging from many-body physics to random number generators are discussed.
Comments:
6 figures, 9 pages
Subjects:
Quantum Physics (quant-ph); Strongly Correlated Electrons (cond-mat.str-el); Nuclear Theory (nucl-th)
arXiv:
2106.10867 [pdf]
PRA(2021)·32 citations
14
[Submitted on 21 Jun 2021] (cross-list from cond-mat.quant-gas)
Universal many-body diffusion from momentum dephasing
Maurício Hippert🇺🇸 · Gabriel T. Landi🇧🇷 · Jorge Noronha🇺🇸
The open dynamics of quantum many-body systems involve not only the exchange of energy, but also of other conserved quantities, such as momentum. This leads to additional decoherence, which may have a profound impact in the dynamics. Motivated by this, we consider a many-body system subject to total momentum dephasing and show that under very general conditions this leads to a diffusive component in the dynamics of any local density, even far from equilibrium. Such component will usually have an intricate interplay with the unitary dynamics. To illustrate this, we consider the case of a superfluid and show that momentum dephasing introduces a damping in the sound-wave dispersion relation, similar to that predicted by the Navier-Stokes equation for ordinary fluids. Finally, we also study the effects of dephasing in linear response, and show that it leads to a universal additive contribution to the diffusion constant, which can be obtained from a Kubo formula.
Subjects:
Quantum Gases (cond-mat.quant-gas); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th); Quantum Physics (quant-ph)
arXiv:
2106.10984 [pdf]
2 citations
15
[Submitted on 21 Jun 2021] (cross-list from hep-ph)
Strong decays of the low-lying doubly bottom baryons
Hui-Zhen He🇨🇳 · Wei Liang🇨🇳 · Qi-Fang Lü🇨🇳
In this work, we adopt the $^{3} P_{0}$ model to investigate the strong decays of the low-lying doubly bottom baryons in the $j - j$ coupling scheme systematically. In this scheme, we construct the formulism of $^{3} P_{0}$ model under the spectator assumption, and then the heavy diquark symmetry is preserved automatically. Our results show that some of the $λ$ -mode $Ξ_{bb} (1 P)$ and $Ω_{bb} (1 P)$ states are narrow, which have good potentials to be observed by future experiments. For the low-lying $ρ$ -mode and $ρ$ - $λ$ hybrid states, the Okubo-Zweig-Iizuka-allowed strong decays are highly suppressed and they should be extremely narrow. Future experiments can test our phenomenological predictions at the quark level.
Comments:
12 pages, 4 figures. Some discussions are added, accepted version
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
arXiv:
2106.11045 [pdf]
PRD(2022)·12 citations
16
[Submitted on 21 Jun 2021] (cross-list from astro-ph.HE)
Antistars or antimatter cores in mirror neutron stars?
Zurab Berezhiani🇮🇹
The oscillation of the neutron $n$ into mirror neutron $n^{'}$ , its partner from dark mirror sector, can gradually transform an ordinary neutron star into a mixed star consisting in part of mirror dark matter. The implications of the reverse process taking place in the mirror neutron stars depend on the sign of baryon asymmetry in mirror sector. Namely, if it is negative, as predicted by certain baryogenesis scenarios, then $n ˉ^{'} - n ˉ$ transitions create a core of our antimatter gravitationally trapped in the mirror star interior. The annihilation of accreted gas on such antimatter cores could explain the origin $γ$ -source candidates, with unusual spectrum compatible to baryon-antibaryon annihilation, recently identified in the Fermi LAT catalog, In addition, some part of this antimatter escaping after the mergers of mirror neutron stars can produce the flux of cosmic antihelium and also heavier antinuclei which are hunted in the AMS-02 experiment.
Comments:
11 pages
Subjects:
High Energy Astrophysical Phenomena (astro-ph.HE); Cosmology and Nongalactic Astrophysics (astro-ph.CO); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2106.11203 [pdf]
Universe(2022)·17 citations
17
[Submitted on 21 Jun 2021] (cross-list from astro-ph.HE)
Studying VLOCV twin compact stars with binary mergers
Z. Sharifi🇮🇷 · M. Bigdeli🇮🇷 · D. Alvarez-Castillo🇵🇱
GW170817 has provided valuable constraints on the equations of state of merging binary neutron stars, which can be considered as the most probable candidate for the source of gravitational waves. On the other hand, these natural laboratories of extreme temperature and density may lead to the estimation of some exotic matter like {deconfined quark matter in their cores}. In this paper, we investigate the neutron star matter equation of state (EoS) with the lowest order constrained variational (LOCV) method considering the excluded volume effect (VLOCV) for nucleons {to} compute the tidal deformability of binary neutron star mergers (BNSMs). Within this approach, the size of nucleons makes the EoS {so} stiff that requires a phase transition in order to avoid causality violation. Therefore, this phase transition {may lead} to the appearance of the third family of compact stars {including} ``twin star'' configurations. {Our EoS models are confronted with observations from GW170817, GW190814, GW190425, and also NICER. We find out that regarding all these constraints, the EoS models having the {transition} pressure $\approx$ 30-100 MeV/fm $^{3}$ and the energy density discontinuity $Δ ε$ $≲$ 300 MeV/fm $^{3}$ are preferable.
Comments:
24 pages, 7 figures
Subjects:
High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2106.11219 [pdf]
PRD(2021)·17 citations
18
[Submitted on 21 Jun 2021] (cross-list from hep-ph)
The importance of kinematic twists and genuine saturation effects in dijet production at the Electron-Ion Collider
Renaud Boussarie🇫🇷 · Heikki Mäntysaari🇫🇮 · Farid Salazar🇺🇸 · Björn Schenke🇺🇸
We compute the differential yield for quark anti-quark dijet production in high-energy electron-proton and electron-nucleus collisions at small $x$ as a function of the relative momentum $P_{⊥}$ and momentum imbalance $k_{⊥}$ of the dijet system for different photon virtualities $Q^{2}$ , and study the elliptic and quadrangular anisotropies in the relative angle between $P_{⊥}$ and $k_{⊥}$ . We review and extend the analysis in [1], which compared the results of the Color Glass Condensate (CGC) with those obtained using the transverse momentum dependent (TMD) framework. In particular, we include in our comparison the improved TMD (ITMD) framework, which resums kinematic power corrections of the ratio $k_{⊥}$ over the hard scale $Q_{⊥}$ . By comparing ITMD and CGC results we are able to isolate genuine higher saturation contributions in the ratio $Q_{s} / Q_{⊥}$ which are resummed only in the CGC. These saturation contributions are in addition to those in the WeizsäckerWilliams gluon TMD that appear in powers of $Q_{s} / k_{⊥}$ . We provide numerical estimates of these contributions for inclusive dijet production at the future Electron-Ion Collider, and identify kinematic windows where they can become relevant in the measurement of dijet and dihadron azimuthal correlations. We argue that such measurements will allow the detailed experimental study of both kinematic power corrections and genuine gluon saturation effects.
Comments:
v3: typos corrected post-publication. v2: 52 pages, 13 figures, matches published version
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2106.11301 [pdf]
JHEP(2021)·74 citations
19
[Submitted on 21 Jun 2021] (cross-list from physics.chem-ph)
Variational coupled cluster for ground and excited states
Antoine Marie🇫🇷 · Fábris Kossoski🇫🇷 · Pierre-François Loos🇫🇷
In single-reference coupled-cluster (CC) methods, one has to solve a set of non-linear polynomial equations in order to determine the so-called amplitudes which are then used to compute the energy and other properties. Although it is of common practice to converge to the (lowest-energy) ground-state solution, it is also possible, thanks to tailored algorithms, to access higher-energy roots of these equations which may or may not correspond to genuine excited states. Here, we explore the structure of the energy landscape of variational CC (VCC) and we compare it with its (projected) traditional version (TCC) in the case where the excitation operator is restricted to paired double excitations (pCCD). By investigating two model systems (the symmetric stretching of the linear \ce{H4} molecule and the continuous deformation of the square \ce{H4} molecule into a rectangular arrangement) in the presence of weak and strong correlations, the performance of VpCCD and TpCCD are gauged against their configuration interaction (CI) equivalent, known as doubly-occupied CI (DOCI), for reference Slater determinants made of ground- or excited-state Hartree-Fock orbitals or state-specific orbitals optimized directly at the VpCCD level. The influence of spatial symmetry breaking is also investigated.
Comments:
16 pages, 8 figures
Subjects:
physics.chem-ph (physics.chem-ph); cond-mat.mtrl-sci (cond-mat.mtrl-sci); Strongly Correlated Electrons (cond-mat.str-el); Nuclear Theory (nucl-th); Computational Physics (physics.comp-ph)
arXiv:
2106.11305 [pdf]
J.Chem.Phys.(2021)·14 citations

Affiliations

first authorsco-authorsvia INSPIRE