Pub Date : 2025-02-07DOI: 10.1016/j.physletb.2025.139308
Shun'ya Mizoguchi , Takumi Oikawa
We identify Narain conformal field theories (CFTs) that correspond to code lattices for quantum error-correcting codes (QECC) over integers of cyclotomic fields for general prime . This code-lattice construction is a generalization of more familiar ones such as Construction A for ternary codes and (after the generalization stated below) Construction A for binary codes, containing them as special cases. This code-lattice construction is redescribed in terms of root and weight lattices of Lie algebras, which allows to construct lattices for codes over rings with non-prime q. Corresponding Narain CFTs are found for codes embedded into quotient rings of root and weight lattices of ADE series, except and with k even. In a sense, this provides a unified description of the relationship between various QECCs over (or ) and Narain CFTs. A further extension on constructing the lattice from codes over the Mordell-Weil groups of extremal rational elliptic surfaces is also briefly discussed.
{"title":"Unifying error-correcting code/Narain CFT correspondences via lattices over integers of cyclotomic fields","authors":"Shun'ya Mizoguchi , Takumi Oikawa","doi":"10.1016/j.physletb.2025.139308","DOIUrl":"10.1016/j.physletb.2025.139308","url":null,"abstract":"<div><div>We identify Narain conformal field theories (CFTs) that correspond to code lattices for quantum error-correcting codes (QECC) over integers of cyclotomic fields <span><math><mi>Q</mi><mo>(</mo><msub><mrow><mi>ζ</mi></mrow><mrow><mi>p</mi></mrow></msub><mo>)</mo></math></span> <span><math><mo>(</mo><msub><mrow><mi>ζ</mi></mrow><mrow><mi>p</mi></mrow></msub><mo>=</mo><msup><mrow><mi>e</mi></mrow><mrow><mfrac><mrow><mn>2</mn><mi>π</mi><mi>i</mi></mrow><mrow><mi>p</mi></mrow></mfrac></mrow></msup><mo>)</mo></math></span> for general prime <span><math><mi>p</mi><mo>≥</mo><mn>3</mn></math></span>. This code-lattice construction is a generalization of more familiar ones such as Construction A<span><math><msub><mrow></mrow><mrow><mi>C</mi></mrow></msub></math></span> for ternary codes and (after the generalization stated below) Construction A for binary codes, containing them as special cases. This code-lattice construction is redescribed in terms of root and weight lattices of Lie algebras, which allows to construct lattices for codes over rings <span><math><msub><mrow><mi>Z</mi></mrow><mrow><mi>q</mi></mrow></msub></math></span> with non-prime <em>q</em>. Corresponding Narain CFTs are found for codes embedded into quotient rings of root and weight lattices of <em>ADE</em> series, except <span><math><msub><mrow><mi>E</mi></mrow><mrow><mn>8</mn></mrow></msub></math></span> and <span><math><msub><mrow><mi>D</mi></mrow><mrow><mi>k</mi></mrow></msub></math></span> with <em>k</em> even. In a sense, this provides a unified description of the relationship between various QECCs over <span><math><msub><mrow><mi>F</mi></mrow><mrow><mi>p</mi></mrow></msub></math></span> (or <span><math><msub><mrow><mi>Z</mi></mrow><mrow><mi>q</mi></mrow></msub></math></span>) and Narain CFTs. A further extension on constructing the <span><math><msub><mrow><mi>E</mi></mrow><mrow><mn>8</mn></mrow></msub></math></span> lattice from codes over the Mordell-Weil groups of extremal rational elliptic surfaces is also briefly discussed.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"862 ","pages":"Article 139308"},"PeriodicalIF":4.3,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143388434","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-07DOI: 10.1016/j.physletb.2025.139310
Seth Grable , Paul Romatschke
We consider continuum-formulation QCD in four dimensions with twelve massless fundamental quark flavors. Splitting the SU(N) gauge field into background and fluctuation parts, we use well-developed techniques to calculate the one-loop effective action for the theory. We find that for constant self-dual background field-strength tensor the notorious infrared divergences of the effective action cancel between gauge and matter sectors if the number of massless quark flavors is exactly . The ultraviolet divergencies of the effective action are non-perturbatively renormalized with a β-function that matches the known perturbative result in the high energy limit. The resulting UV- and IR-finite effective action possesses a non-trivial saddle which has lower free energy than the perturbative vacuum, and for which the expectation value of the Polyakov loop vanishes. Inclusion of finite temperature effects points to the presence of a first-order phase transition to the perturbative vacuum with a calculable critical temperature.
{"title":"Vanishing Polyakov loop for QCD with twelve massless quarks","authors":"Seth Grable , Paul Romatschke","doi":"10.1016/j.physletb.2025.139310","DOIUrl":"10.1016/j.physletb.2025.139310","url":null,"abstract":"<div><div>We consider continuum-formulation QCD in four dimensions with twelve massless fundamental quark flavors. Splitting the SU(<em>N</em>) gauge field into background and fluctuation parts, we use well-developed techniques to calculate the one-loop effective action for the theory. We find that for constant self-dual background field-strength tensor the notorious infrared divergences of the effective action cancel between gauge and matter sectors if the number of massless quark flavors is exactly <span><math><msub><mrow><mi>N</mi></mrow><mrow><mi>f</mi></mrow></msub><mo>=</mo><mn>4</mn><mi>N</mi></math></span>. The ultraviolet divergencies of the effective action are non-perturbatively renormalized with a <em>β</em>-function that matches the known perturbative result in the high energy limit. The resulting UV- and IR-finite effective action possesses a non-trivial saddle which has lower free energy than the perturbative vacuum, and for which the expectation value of the Polyakov loop vanishes. Inclusion of finite temperature effects points to the presence of a first-order phase transition to the perturbative vacuum with a calculable critical temperature.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"862 ","pages":"Article 139310"},"PeriodicalIF":4.3,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143388435","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-05DOI: 10.1016/j.physletb.2025.139306
P.S. Bhupal Dev , Pedro A.N. Machado , Ivan Martínez-Soler
We show that if neutrinos are pseudo-Dirac, they can potentially affect the flavor ratio predictions for the high-energy astrophysical neutrino flux observed by IceCube. In this context, we point out a novel matter effect induced by the cosmic neutrino background (CνB) on the flavor ratio composition. Specifically, the active-sterile neutrino oscillations over the astrophysical baseline lead to an energy-dependent flavor ratio at Earth due to the CνB matter effect, which is in principle distinguishable from the vacuum oscillation effect, provided there is an asymmetry between the neutrino and antineutrino number densities, as well as a local CνB overdensity. Considering the projected precision of the 3-neutrino oscillation parameter measurements and improved flavor triangle measurements, we show that the next-generation neutrino telescopes, such as KM3NeT and IceCube-Gen2, can in principle probe the pseudo-Dirac neutrino hypothesis and the CνB matter effect.
{"title":"Pseudo-Dirac neutrinos and relic neutrino matter effect on the high-energy neutrino flavor composition","authors":"P.S. Bhupal Dev , Pedro A.N. Machado , Ivan Martínez-Soler","doi":"10.1016/j.physletb.2025.139306","DOIUrl":"10.1016/j.physletb.2025.139306","url":null,"abstract":"<div><div>We show that if neutrinos are pseudo-Dirac, they can potentially affect the flavor ratio predictions for the high-energy astrophysical neutrino flux observed by IceCube. In this context, we point out a novel matter effect induced by the cosmic neutrino background (C<em>ν</em>B) on the flavor ratio composition. Specifically, the active-sterile neutrino oscillations over the astrophysical baseline lead to an energy-dependent flavor ratio at Earth due to the C<em>ν</em>B matter effect, which is in principle distinguishable from the vacuum oscillation effect, provided there is an asymmetry between the neutrino and antineutrino number densities, as well as a local C<em>ν</em>B overdensity. Considering the projected precision of the 3-neutrino oscillation parameter measurements and improved flavor triangle measurements, we show that the next-generation neutrino telescopes, such as KM3NeT and IceCube-Gen2, can in principle probe the pseudo-Dirac neutrino hypothesis and the C<em>ν</em>B matter effect.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"862 ","pages":"Article 139306"},"PeriodicalIF":4.3,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143214714","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We study the precession features of a test particle and gyroscope attached to a stationary observer in Horndeski rotating spacetime. First, we study the precession orbit, Lense-Thirring (LT) precession as well as periastron precession frequencies of the test particle, which are helpful to test the strong gravity of the central object and to distinguish Horndeski rotating black holes from naked singularities. We find that both LT frequency and periastron precession frequency of Horndeski rotating black hole and naked singularity behave differently when the particle's orbit approaches the innermost stable circular orbit. Also, the effects of Horndeski parameter on the two precession frequencies are explored. Second, we investigate the spin precession of a test gyroscope in the Horndeski rotating spacetime by analyzing the LT frequency, the geodetic precession frequency, and the general spin precession frequency for a stationary observer in the spacetime. The angle, spin parameter and Horndeski parameter modify all these frequencies, which make the results shift from those in Kerr spacetimes. Furthermore, these precession frequencies for the Horndeski rotating black hole and naked singularity are distinguishable. In particular, as the observer gets close to the central object in an arbitrary direction, the frequencies of Horndeski black hole grow significantly and become divergent, while for naked singularity they are finite. These theoretical results in some sense provide a potential method to “detect” event horizon, and to distinguish Horndeski theory from Einstein's general relativity.
{"title":"Orbital precession and Lense-Thirring effect of Horndeski rotating spacetimes","authors":"Wen-Qi Zhen , Hong Guo , Meng-He Wu , Xiao-Mei Kuang","doi":"10.1016/j.physletb.2025.139307","DOIUrl":"10.1016/j.physletb.2025.139307","url":null,"abstract":"<div><div>We study the precession features of a test particle and gyroscope attached to a stationary observer in Horndeski rotating spacetime. First, we study the precession orbit, Lense-Thirring (LT) precession as well as periastron precession frequencies of the test particle, which are helpful to test the strong gravity of the central object and to distinguish Horndeski rotating black holes from naked singularities. We find that both LT frequency and periastron precession frequency of Horndeski rotating black hole and naked singularity behave differently when the particle's orbit approaches the innermost stable circular orbit. Also, the effects of Horndeski parameter on the two precession frequencies are explored. Second, we investigate the spin precession of a test gyroscope in the Horndeski rotating spacetime by analyzing the LT frequency, the geodetic precession frequency, and the general spin precession frequency for a stationary observer in the spacetime. The angle, spin parameter and Horndeski parameter modify all these frequencies, which make the results shift from those in Kerr spacetimes. Furthermore, these precession frequencies for the Horndeski rotating black hole and naked singularity are distinguishable. In particular, as the observer gets close to the central object in an arbitrary direction, the frequencies of Horndeski black hole grow significantly and become divergent, while for naked singularity they are finite. These theoretical results in some sense provide a potential method to “detect” event horizon, and to distinguish Horndeski theory from Einstein's general relativity.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"862 ","pages":"Article 139307"},"PeriodicalIF":4.3,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143419613","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-05DOI: 10.1016/j.physletb.2025.139297
M.C. Gonzalez-Garcia , Michele Maltoni , João Paulo Pinheiro
We perform a global analysis of most up-to-date solar neutrino data and KamLAND reactor antineutrino data in the framework of the 3+1 sterile neutrino mixing scenario (invoked to explain the results of the Gallium source experiments) with the aim of quantifying the dependence of the (in)compatibility of the required mixing with assumptions on the initial fluxes. The analysis of solar data is performed in two alternative ways: using the flux predicted by the latest standard solar models, and in a model independent approach where the solar fluxes are also determined by the fit. The dependence on the normalization of the capture rate in the solar Gallium experiments is also quantified. Similarly, in the KamLAND analysis we consider both the case where the reactor flux normalization is assumed to be known a priori, as well as a normalization free case which relies solely on available neutrino data. Using a parameter goodness of fit test, we find that in most cases the compatibility between Gallium and solar+KamLAND data only occur at the 3σ level or higher. We also discuss the implications of enforcing better compatibility by tweaking the mechanism for the energy production in the Sun.
{"title":"Solar model independent constraints on the sterile neutrino interpretation of the Gallium Anomaly","authors":"M.C. Gonzalez-Garcia , Michele Maltoni , João Paulo Pinheiro","doi":"10.1016/j.physletb.2025.139297","DOIUrl":"10.1016/j.physletb.2025.139297","url":null,"abstract":"<div><div>We perform a global analysis of most up-to-date solar neutrino data and KamLAND reactor antineutrino data in the framework of the 3+1 sterile neutrino mixing scenario (invoked to explain the results of the Gallium source experiments) with the aim of quantifying the dependence of the (in)compatibility of the required mixing with assumptions on the initial fluxes. The analysis of solar data is performed in two alternative ways: using the flux predicted by the latest standard solar models, and in a model independent approach where the solar fluxes are also determined by the fit. The dependence on the normalization of the capture rate in the solar Gallium experiments is also quantified. Similarly, in the KamLAND analysis we consider both the case where the reactor flux normalization is assumed to be known <em>a priori</em>, as well as a normalization free case which relies solely on available neutrino data. Using a parameter goodness of fit test, we find that in most cases the compatibility between Gallium and solar+KamLAND data only occur at the 3<em>σ</em> level or higher. We also discuss the implications of enforcing better compatibility by tweaking the mechanism for the energy production in the Sun.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"862 ","pages":"Article 139297"},"PeriodicalIF":4.3,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143214713","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-04DOI: 10.1016/j.physletb.2025.139298
Saiyad Ashanujjaman , Sumit Banik , Guglielmo Coloretti , Andreas Crivellin , Siddharth P. Maharathy , Bruce Mellado
The multi-lepton anomalies suggest the existence of a new scalar with a mass between 145 GeV and 155 GeV, which is compatible with indications of the associated production of a narrow resonance with a mass of ≈151 GeV. These anomalies require a sizable branching fraction of the new scalar to WW. However, because no ZZ signal at this mass has been observed, this implies that the new boson could be the neutral component of an triplet with zero hypercharge. This field leads to a positive definite shift in the W mass and is produced via the Drell-Yan process . We use the side-bands of the ATLAS analysis [1] of the associated production of the Standard Model Higgs in the di-photon channel to search for this production mode of the triplet. Since the dominant decays of depend only on its mass, the effect in the 22 signal categories considered by ATLAS is completely correlated. Combining all channels in a likelihood ratio test, we find that a non-zero Br, with a best-fit value of 0.66%, is preferred by ≈3σ for a mass of ≈151.5 GeV. While this mass is consistent with the multi-lepton anomalies, there is also an excess at ≈127 GeV with a significance of 3.6σ. However, the latter is inconsistent with the mass predicted by the multi-lepton anomalies and is in close proximity to the SM Higgs mass, suggesting the possibility of enhanced associated production of the SM Higgs.
{"title":"Explaining the γγ + X excesses at ≈151.5 GeV via the Drell-Yan production of a Higgs triplet","authors":"Saiyad Ashanujjaman , Sumit Banik , Guglielmo Coloretti , Andreas Crivellin , Siddharth P. Maharathy , Bruce Mellado","doi":"10.1016/j.physletb.2025.139298","DOIUrl":"10.1016/j.physletb.2025.139298","url":null,"abstract":"<div><div>The multi-lepton anomalies suggest the existence of a new scalar with a mass between 145 GeV and 155 GeV, which is compatible with indications of the associated production of a narrow resonance with a mass of ≈151 GeV. These anomalies require a sizable branching fraction of the new scalar to <em>WW</em>. However, because no <em>ZZ</em> signal at this mass has been observed, this implies that the new boson could be the neutral component of an <span><math><mi>S</mi><mi>U</mi><msub><mrow><mo>(</mo><mn>2</mn><mo>)</mo></mrow><mrow><mi>L</mi></mrow></msub></math></span> triplet with zero hypercharge. This field leads to a positive definite shift in the <em>W</em> mass and is produced via the Drell-Yan process <span><math><mi>p</mi><mi>p</mi><mo>→</mo><msup><mrow><mi>W</mi></mrow><mrow><mo>⁎</mo></mrow></msup><mo>→</mo><msup><mrow><mi>Δ</mi></mrow><mrow><mn>0</mn></mrow></msup><msup><mrow><mi>Δ</mi></mrow><mrow><mo>±</mo></mrow></msup></math></span>. We use the side-bands of the ATLAS analysis <span><span>[1]</span></span> of the associated production of the Standard Model Higgs in the di-photon channel to search for this production mode of the triplet. Since the dominant decays of <span><math><msup><mrow><mi>Δ</mi></mrow><mrow><mo>±</mo></mrow></msup></math></span> depend only on its mass, the effect in the 22 signal categories considered by ATLAS is completely correlated. Combining all channels in a likelihood ratio test, we find that a non-zero Br<span><math><mo>[</mo><msup><mrow><mi>Δ</mi></mrow><mrow><mn>0</mn></mrow></msup><mo>→</mo><mi>γ</mi><mi>γ</mi><mo>]</mo></math></span>, with a best-fit value of 0.66%, is preferred by ≈3<em>σ</em> for a mass of ≈151.5 GeV. While this mass is consistent with the multi-lepton anomalies, there is also an excess at ≈127 GeV with a significance of 3.6<em>σ</em>. However, the latter is inconsistent with the mass predicted by the multi-lepton anomalies and is in close proximity to the SM Higgs mass, suggesting the possibility of enhanced associated production of the SM Higgs.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"862 ","pages":"Article 139298"},"PeriodicalIF":4.3,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143214715","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-04DOI: 10.1016/j.physletb.2025.139302
Y. Jaganathen, M. Kowal, K. Pomorski
We present an in-depth investigation of heavy-ion fusion dynamics using a six-dimensional Langevin framework that enables unrestricted motion of the asymmetry parameter. The stochastic formalism naturally incorporates friction effects and energy fluctuations, providing a detailed understanding of the fusion process. The dynamics transition into the overdamped regime, facilitating rapid neck stabilization while effectively capturing the interplay between shape and rotational degrees of freedom. This approach achieves excellent agreement with experimental spin distributions and fusion cross-sections, establishing a robust foundation for forthcoming studies on the synthesis of superheavy elements and the exploration of the enigmatic fusion hindrance mechanism.
{"title":"Demystifying the fusion mechanism in heavy-ion collisions: A six-dimensional Langevin dissipative dynamics approach","authors":"Y. Jaganathen, M. Kowal, K. Pomorski","doi":"10.1016/j.physletb.2025.139302","DOIUrl":"10.1016/j.physletb.2025.139302","url":null,"abstract":"<div><div>We present an in-depth investigation of heavy-ion fusion dynamics using a six-dimensional Langevin framework that enables unrestricted motion of the asymmetry parameter. The stochastic formalism naturally incorporates friction effects and energy fluctuations, providing a detailed understanding of the fusion process. The dynamics transition into the overdamped regime, facilitating rapid neck stabilization while effectively capturing the interplay between shape and rotational degrees of freedom. This approach achieves excellent agreement with experimental spin distributions and fusion cross-sections, establishing a robust foundation for forthcoming studies on the synthesis of superheavy elements and the exploration of the enigmatic fusion hindrance mechanism.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"862 ","pages":"Article 139302"},"PeriodicalIF":4.3,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143214780","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-04DOI: 10.1016/j.physletb.2025.139301
G.H. Yang , Y. Kuang , Z.X. Yang , Z.P. Li
Based on the relativistic impulse approximation of proton-nucleus elastic scattering theory, the neutron density distribution and neutron skin thickness of 48Ca are estimated via the deep learning method. The neural-network-generated neutron densities are mainly compressed to be higher inside the nucleus compared with the results from the relativistic PC-PK1 density functional, resulting in a significant improvement on the large-angle scattering observables, both for the differential cross section and analyzing power. The neutron skin thickness of 48Ca is captured to be 0.199(17) fm. The relatively thicker neutron skin is deemed reasonable from the perspective of density functional analysis.
{"title":"Extracting neutron skin from elastic proton-nucleus scattering with deep neural network","authors":"G.H. Yang , Y. Kuang , Z.X. Yang , Z.P. Li","doi":"10.1016/j.physletb.2025.139301","DOIUrl":"10.1016/j.physletb.2025.139301","url":null,"abstract":"<div><div>Based on the relativistic impulse approximation of proton-nucleus elastic scattering theory, the neutron density distribution and neutron skin thickness of <sup>48</sup>Ca are estimated via the deep learning method. The neural-network-generated neutron densities are mainly compressed to be higher inside the nucleus compared with the results from the relativistic PC-PK1 density functional, resulting in a significant improvement on the large-angle scattering observables, both for the differential cross section and analyzing power. The neutron skin thickness of <sup>48</sup>Ca is captured to be 0.199(17) fm. The relatively thicker neutron skin is deemed reasonable from the perspective of density functional analysis.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"862 ","pages":"Article 139301"},"PeriodicalIF":4.3,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143351019","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-03DOI: 10.1016/j.physletb.2025.139299
Wen Chen
Feynman integrals can be expanded asymptotically with respect to some small parameters at the integrand level, a technique known as the expansion by regions. A naive expansion by regions may break down due to divergences not regulated by the spacetime dimension, exemplified by the rapidity divergences. A criterion to identify unregulated divergences is provided in this article. The analysis is conducted using both parametric and Mellin-Barnes representations, leading to a consistent conclusion. Based on this analysis, it is proven that the presence of unregulated divergences implies the degeneracies of regions.
{"title":"Unregulated divergences of Feynman integrals","authors":"Wen Chen","doi":"10.1016/j.physletb.2025.139299","DOIUrl":"10.1016/j.physletb.2025.139299","url":null,"abstract":"<div><div>Feynman integrals can be expanded asymptotically with respect to some small parameters at the integrand level, a technique known as the expansion by regions. A naive expansion by regions may break down due to divergences not regulated by the spacetime dimension, exemplified by the rapidity divergences. A criterion to identify unregulated divergences is provided in this article. The analysis is conducted using both parametric and Mellin-Barnes representations, leading to a consistent conclusion. Based on this analysis, it is proven that <em>the presence of unregulated divergences implies the degeneracies of regions</em>.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"862 ","pages":"Article 139299"},"PeriodicalIF":4.3,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143214712","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-03DOI: 10.1016/j.physletb.2025.139300
Zibo Shen , Anzhong Wang , Shaoyu Yin
We study a class of analytic models for a dark matter halo surrounding a Schwarzschild black hole sitting at the center of a galaxy, with a variable inner radius at which the density profile of the dark matter halo vanishes. We examine in detail how the three energy conditions are satisfied in such models. In particular, independent of concrete profile, we find that the three energy conditions are satisfied when , where M denotes the mass of the black hole. This indicates it is crucial to include inner radius when discussing dark matter distributions. All our solutions expressed explicitly in closed form are particularly valuable for the studies of the gravitational waveforms of extreme/intermediate mass ratio inspirals and the nature of dark matter in galaxies.
{"title":"Inner radius and energy conditions of dark matter halos surrounding Schwarzschild black holes","authors":"Zibo Shen , Anzhong Wang , Shaoyu Yin","doi":"10.1016/j.physletb.2025.139300","DOIUrl":"10.1016/j.physletb.2025.139300","url":null,"abstract":"<div><div>We study a class of analytic models for a dark matter halo surrounding a Schwarzschild black hole sitting at the center of a galaxy, with a variable inner radius <span><math><msub><mrow><mi>r</mi></mrow><mrow><mtext>in</mtext></mrow></msub></math></span> at which the density profile of the dark matter halo vanishes. We examine in detail how the three energy conditions are satisfied in such models. In particular, independent of concrete profile, we find that the three energy conditions are satisfied when <span><math><msub><mrow><mi>r</mi></mrow><mrow><mtext>in</mtext></mrow></msub><mo>≥</mo><mn>5</mn><mi>M</mi><mo>/</mo><mn>2</mn></math></span>, where <em>M</em> denotes the mass of the black hole. This indicates it is crucial to include inner radius when discussing dark matter distributions. All our solutions expressed explicitly in closed form are particularly valuable for the studies of the gravitational waveforms of extreme/intermediate mass ratio inspirals and the nature of dark matter in galaxies.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"862 ","pages":"Article 139300"},"PeriodicalIF":4.3,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143214782","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
扫码关注我们
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号