Neutron stars (NSs) have generally been considered as cold, zero-temperature entities. Recent progress in computational methods and theoretical modelling has opened up the exploration of finite temperature effects, marking an important research frontier. We examine the macroscopic properties of Proto-Neutron Stars (PNS) using different parametrizations of relativistic mean field (RMF) models. We adopt a constant entropy approach by fixing entropy per baryon, and 2. Higher S elevates the maximum mass for PNS and flattens the mass-radius curves. The higher lepton fraction () leads to a decrease in maximum mass and an increase in the canonical radius. Furthermore, both the S and influence the dimensionless tidal deformability (Λ). We note that the f-mode frequencies in PNSs increase as S decreases and the increases at maximum mass. We find that the macroscopic properties of the PNS exhibit the same trend, irrespective of the parameter sets employed for the variation of S and .
中子星（NSs）通常被认为是冷的、零温度的实体。计算方法和理论建模的最新进展开启了对有限温度效应的探索，标志着一个重要的研究前沿。我们利用相对论均场模型的不同参数化研究了原中子星（PNS）的宏观性质。我们采用恒熵方法，固定每个重子的熵，S=1 和 2。S越大，PNS的最大质量越高，质量-半径曲线越平缓。更高的轻子分数（Yl）会导致最大质量下降和典型半径增加。此外，S 和 Yl 都会影响无量纲潮汐变形率（Λ）。我们注意到，PNS 的 f 模频率随着 S 的减小而增大，而 Yl 则在最大质量时增大。我们发现，无论采用哪种参数集来改变 S 和 Yl，PNS 的宏观特性都表现出相同的趋势。
{"title":"Exploring the macroscopic properties of proto-neutron stars: Effects of entropy and lepton fraction","authors":"Sayantan Ghosh , Shahebaj Shaikh , Probit J. Kalita , Pinku Routaray , Bharat Kumar , B.K. Agrawal","doi":"10.1016/j.nuclphysb.2024.116697","DOIUrl":"10.1016/j.nuclphysb.2024.116697","url":null,"abstract":"<div><div>Neutron stars (NSs) have generally been considered as cold, zero-temperature entities. Recent progress in computational methods and theoretical modelling has opened up the exploration of finite temperature effects, marking an important research frontier. We examine the macroscopic properties of Proto-Neutron Stars (PNS) using different parametrizations of relativistic mean field (RMF) models. We adopt a constant entropy approach by fixing entropy per baryon, <span><math><mi>S</mi><mo>=</mo><mn>1</mn></math></span> and 2. Higher S elevates the maximum mass for PNS and flattens the mass-radius curves. The higher lepton fraction (<span><math><msub><mrow><mi>Y</mi></mrow><mrow><mi>l</mi></mrow></msub></math></span>) leads to a decrease in maximum mass and an increase in the canonical radius. Furthermore, both the S and <span><math><msub><mrow><mi>Y</mi></mrow><mrow><mi>l</mi></mrow></msub></math></span> influence the dimensionless tidal deformability (Λ). We note that the <em>f</em>-mode frequencies in PNSs increase as S decreases and the <span><math><msub><mrow><mi>Y</mi></mrow><mrow><mi>l</mi></mrow></msub></math></span> increases at maximum mass. We find that the macroscopic properties of the PNS exhibit the same trend, irrespective of the parameter sets employed for the variation of S and <span><math><msub><mrow><mi>Y</mi></mrow><mrow><mi>l</mi></mrow></msub></math></span>.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1008 ","pages":"Article 116697"},"PeriodicalIF":2.5,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142358957","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2024-09-26DOI: 10.1016/j.nuclphysb.2024.116701
Frank X. Lee , Walter Wilcox , Andrei Alexandru , Chris Culver , Shayan Nadeem
We report a proof-of-principle lattice QCD simulation of the electric and magnetic polarizabilities for a neutral pion in the four-point function method. The results are based on the same quenched Wilson ensembles on a lattice at with pion mass from 1100 to 370 MeV previously used for a charged pion. For electric polarizability, the results are largely consistent with those from the background field method and ChPT. In contrast, there are significant differences for magnetic polarizability among the four-point function method, the background field method, and ChPT. The situation points to the important role of disconnected diagrams for a neutral pion. We elucidate a transparent quark decomposition in the four-point function method that can be used to shed light on the issue.
{"title":"Neutral pion polarizabilities from four-point functions in lattice QCD","authors":"Frank X. Lee , Walter Wilcox , Andrei Alexandru , Chris Culver , Shayan Nadeem","doi":"10.1016/j.nuclphysb.2024.116701","DOIUrl":"10.1016/j.nuclphysb.2024.116701","url":null,"abstract":"<div><div>We report a proof-of-principle lattice QCD simulation of the electric and magnetic polarizabilities for a neutral pion in the four-point function method. The results are based on the same quenched Wilson ensembles on a <span><math><msup><mrow><mn>24</mn></mrow><mrow><mn>3</mn></mrow></msup><mo>×</mo><mn>48</mn></math></span> lattice at <span><math><mi>β</mi><mo>=</mo><mn>6.0</mn></math></span> with pion mass from 1100 to 370 MeV previously used for a charged pion. For electric polarizability, the results are largely consistent with those from the background field method and ChPT. In contrast, there are significant differences for magnetic polarizability among the four-point function method, the background field method, and ChPT. The situation points to the important role of disconnected diagrams for a neutral pion. We elucidate a transparent quark decomposition in the four-point function method that can be used to shed light on the issue.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1008 ","pages":"Article 116701"},"PeriodicalIF":2.5,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142323948","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2024-09-26DOI: 10.1016/j.nuclphysb.2024.116703
R. Lalnuntluanga, R.K. Pradhan, A. Giri
The neutrino experiments utilize heavy nuclear targets to achieve high statistics neutrino-nucleus interaction event rate, which leads to systematic uncertainties in the oscillation parameters due to the nuclear effects and uncertainties in the cross-section. Understanding the interaction of neutrinos with the nucleus becomes crucial in determining the oscillation parameters with high precision. We investigate the uncertainty in quasi-elastic interaction due to nuclear effects by selecting exactly 1 proton, 0 pions, and any number of neutrons in the final state in DUNE and MicroBooNE detectors, and the effects on the neutrino oscillation in the DUNE detector. The calorimetric method with this selection can be used for accurate neutrino energy reconstruction in the quasi-elastic channel where the nuclear effects are inevitable.
{"title":"Probing neutrino-nucleus interaction in DUNE and MicroBooNE","authors":"R. Lalnuntluanga, R.K. Pradhan, A. Giri","doi":"10.1016/j.nuclphysb.2024.116703","DOIUrl":"10.1016/j.nuclphysb.2024.116703","url":null,"abstract":"<div><div>The neutrino experiments utilize heavy nuclear targets to achieve high statistics neutrino-nucleus interaction event rate, which leads to systematic uncertainties in the oscillation parameters due to the nuclear effects and uncertainties in the cross-section. Understanding the interaction of neutrinos with the nucleus becomes crucial in determining the oscillation parameters with high precision. We investigate the uncertainty in quasi-elastic interaction due to nuclear effects by selecting exactly 1 proton, 0 pions, and any number of neutrons in the final state in DUNE and MicroBooNE detectors, and the effects on the neutrino oscillation in the DUNE detector. The calorimetric method with this selection can be used for accurate neutrino energy reconstruction in the quasi-elastic channel where the nuclear effects are inevitable.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1008 ","pages":"Article 116703"},"PeriodicalIF":2.5,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142358960","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 rewrite the worldsheet torus partition function of the Thermal AdS CFT by isolating the boundary parameters. Using this, we show that the spectrum of the Euclidean BTZ black hole and Lorentzian can be extracted – the latter as a zero temperature limit. A similar procedure recovers the Lorentzian BTZ spectrum proposed in an earlier work. We then use our expression to construct a boundary modular invariant expression as a Poincaré series.
{"title":"BTZ and thermal AdS torus partition functions","authors":"Roshan Kaundinya , Omkar Vinayak Nippanikar , Akash Singh , K.P. Yogendran","doi":"10.1016/j.nuclphysb.2024.116698","DOIUrl":"10.1016/j.nuclphysb.2024.116698","url":null,"abstract":"<div><div>We rewrite the worldsheet torus partition function of the Thermal AdS CFT by isolating the boundary parameters. Using this, we show that the spectrum of the Euclidean BTZ black hole and Lorentzian <span><math><mi>A</mi><mi>d</mi><msub><mrow><mi>S</mi></mrow><mrow><mn>3</mn></mrow></msub></math></span> can be extracted – the latter as a zero temperature limit. A similar procedure recovers the Lorentzian BTZ spectrum proposed in an earlier work. We then use our expression to construct a <em>boundary</em> modular invariant expression as a Poincaré series.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1008 ","pages":"Article 116698"},"PeriodicalIF":2.5,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142327109","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2024-09-23DOI: 10.1016/j.nuclphysb.2024.116695
Alexander A. Belavin , Doron R. Gepner
We investigate here the deformations of Berglund Hübsch loop and chain mirrors where the original manifolds are defined in the same weighted projective space. We show that the deformations are equivalent by two methods. First, we map directly the two models to each other and show that the deformations are the same for 79 “Good” models, but not for the 77 “Bad” ones. We then investigate the orbifold of the mirror pair by the maximal symmetry group and show that the number of deformations is the same and that they are almost the same, i.e., the first four exponents of the deformations are identical.
{"title":"Equivalence of deformations of Berglund Hübsch mirror pairs","authors":"Alexander A. Belavin , Doron R. Gepner","doi":"10.1016/j.nuclphysb.2024.116695","DOIUrl":"10.1016/j.nuclphysb.2024.116695","url":null,"abstract":"<div><div>We investigate here the deformations of Berglund Hübsch loop and chain mirrors where the original manifolds are defined in the same weighted projective space. We show that the deformations are equivalent by two methods. First, we map directly the two models to each other and show that the deformations are the same for 79 “Good” models, but not for the 77 “Bad” ones. We then investigate the orbifold of the mirror pair by the maximal symmetry group and show that the number of deformations is the same and that they are almost the same, i.e., the first four exponents of the deformations are identical.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1008 ","pages":"Article 116695"},"PeriodicalIF":2.5,"publicationDate":"2024-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142318999","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2024-09-23DOI: 10.1016/j.nuclphysb.2024.116696
Bob Holdom
Ghosts have been a stumbling block in the development of a UV complete quantum field theory for gravity. We discuss how difficulties associated with ghosts are overcome in the context of 0+1d QFT. Obtaining a probability interpretation is the key issue, and for this we discuss how an appropriate inner product can be constructed to define a sensible Born rule. Ghost theories are intrinsically unitary and perturbatively stable. They can also display nonperturbative stability even when the corresponding normal theory does not. The spectra and propagators are numerically obtained at both weak and strong coupling. Normalizable wave functions are obtained for the energy eigenstates and they show a violation of normal parity. We discuss connections to PT-symmetric quantum mechanics.
{"title":"Making sense of ghosts","authors":"Bob Holdom","doi":"10.1016/j.nuclphysb.2024.116696","DOIUrl":"10.1016/j.nuclphysb.2024.116696","url":null,"abstract":"<div><div>Ghosts have been a stumbling block in the development of a UV complete quantum field theory for gravity. We discuss how difficulties associated with ghosts are overcome in the context of 0+1d QFT. Obtaining a probability interpretation is the key issue, and for this we discuss how an appropriate inner product can be constructed to define a sensible Born rule. Ghost theories are intrinsically unitary and perturbatively stable. They can also display nonperturbative stability even when the corresponding normal theory does not. The spectra and propagators are numerically obtained at both weak and strong coupling. Normalizable wave functions are obtained for the energy eigenstates and they show a violation of normal parity. We discuss connections to PT-symmetric quantum mechanics.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1008 ","pages":"Article 116696"},"PeriodicalIF":2.5,"publicationDate":"2024-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0550321324002621/pdfft?md5=11ccc1b6a3e2b70c9a640c8d692815e4&pid=1-s2.0-S0550321324002621-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142314287","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2024-09-20DOI: 10.1016/j.nuclphysb.2024.116690
Rajesh Kumar , S.K. Maurya , Abdelghani Errehymy , G. Mustafa , Abdel-Haleem Abdel-Aty , H.I. Alrebdi , Mona Mahmoud
This study presented a new exact solution for anisotropic compact stellar objects within the framework of gravity. In this context, the Durgapal-Fuloria metric potential has been employed to solve the field equation derived for theory. Furthermore, we have derived the generalized Darmois-Israel junction condition necessary for seamlessly connecting the interior region to the Schwarzschild exterior metric across the boundary hypersurface of the star in the context of gravity, and the interior solution is matched with the Schwarzschild exterior metric over the bounding surface of a compact star. These junction conditions stipulate that the pressure must not be zero at the boundary and should be proportional to the non-linear terms of gravity, a crucial aspect often overlooked by many researchers when investigating compact stellar models. Additionally, we derived the values of these parameters by using observational data of various compact stars (CSs), namely Her X-1, SAX J1808.4-3658, SMC X-1, LMC X-4, Cen X-3, 4U 1820-30, PSR J1903+327, 4U 1608-52, Vela X-1, and PSR J1416-2230. This approach enables us to investigate the comprehensive analysis of solutions numerically and graphically. We conducted various physical tests, including gradient of energy density and pressures, anisotropy, stability, equilibrium conditions, energy-density constraints, mass function, compactness, redshift, and adiabatic index, to assess the feasibility of our models. Our findings demonstrate the consistent behavior of our models provides a satisfactory physical situation as far as the observational results are confirmed.
{"title":"Anisotropic Durgapal-Fuloria compact stars in f(R) gravity","authors":"Rajesh Kumar , S.K. Maurya , Abdelghani Errehymy , G. Mustafa , Abdel-Haleem Abdel-Aty , H.I. Alrebdi , Mona Mahmoud","doi":"10.1016/j.nuclphysb.2024.116690","DOIUrl":"10.1016/j.nuclphysb.2024.116690","url":null,"abstract":"<div><div>This study presented a new exact solution for anisotropic compact stellar objects within the framework of <span><math><mi>f</mi><mo>(</mo><mi>R</mi><mo>)</mo><mo>=</mo><mi>R</mi><mo>+</mo><mi>α</mi><msup><mrow><mi>R</mi></mrow><mrow><mn>2</mn></mrow></msup></math></span> gravity. In this context, the Durgapal-Fuloria metric potential has been employed to solve the field equation derived for <span><math><mi>f</mi><mo>(</mo><mi>R</mi><mo>)</mo></math></span> theory. Furthermore, we have derived the generalized Darmois-Israel junction condition necessary for seamlessly connecting the interior region to the Schwarzschild exterior metric across the boundary hypersurface of the star in the context of <span><math><mi>f</mi><mo>(</mo><mi>R</mi><mo>)</mo></math></span> gravity, and the interior solution is matched with the Schwarzschild exterior metric over the bounding surface of a compact star. These junction conditions stipulate that the pressure must not be zero at the boundary and should be proportional to the non-linear terms of <span><math><mi>f</mi><mo>(</mo><mi>R</mi><mo>)</mo></math></span> gravity, a crucial aspect often overlooked by many researchers when investigating compact stellar models. Additionally, we derived the values of these parameters by using observational data of various compact stars (CSs), namely Her X-1, SAX J1808.4-3658, SMC X-1, LMC X-4, Cen X-3, 4U 1820-30, PSR J1903+327, 4U 1608-52, Vela X-1, and PSR J1416-2230. This approach enables us to investigate the comprehensive analysis of solutions numerically and graphically. We conducted various physical tests, including gradient of energy density and pressures, anisotropy, stability, equilibrium conditions, energy-density constraints, mass function, compactness, redshift, and adiabatic index, to assess the feasibility of our models. Our findings demonstrate the consistent behavior of our models provides a satisfactory physical situation as far as the observational results are confirmed.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1008 ","pages":"Article 116690"},"PeriodicalIF":2.5,"publicationDate":"2024-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142327110","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2024-09-20DOI: 10.1016/j.nuclphysb.2024.116694
Fayez Abu-Ajamieh , Marco Frasca , Sudhir K. Vempati
Di-Higgs couplings to fermions of the form are absent in the Standard Model, however, they are present in several physics Beyond Standard Model (BSM) extensions, including those with vector-like fermions. In Effective Field Theories (EFTs), such as the Standard Model Effective Field Theory (SMEFT) and the Higgs Effective Field Theory (HEFT), these couplings appear at dimension 6 and can in general, be flavour-violating (FV). In the present work, we employ a bottom-up approach to investigate the FV in the lepton and quarks sectors through the di-Higgs effective couplings. We assume that all FV arises from this type of couplings and assume that the Yukawa couplings are given by their SM values, i.e. . In the lepton sector, we set upper limits on the Wilson coefficients from decays, decays, muonium oscillations, the anomaly, LEP searches, muon conversion in nuclei, FV Higgs decays, and Z decays. We also make projections on some of these coefficients from Belle II, the Mu2e experiment and the LHC's High Luminosity (HL) run. In the quark sector, we set upper limits on the Wilson coefficients from meson oscillations and from B-physics searches. A key takeaway from this study is that current and future experiments should set out to measure the effective di-Higgs couplings , whether these couplings are FV or flavour-conserving. We also present a matching between our formalism and the SMEFT operators and show the bounds in both bases.
{"title":"Flavor violating di-Higgs couplings","authors":"Fayez Abu-Ajamieh , Marco Frasca , Sudhir K. Vempati","doi":"10.1016/j.nuclphysb.2024.116694","DOIUrl":"10.1016/j.nuclphysb.2024.116694","url":null,"abstract":"<div><div>Di-Higgs couplings to fermions of the form <span><math><msup><mrow><mi>h</mi></mrow><mrow><mn>2</mn></mrow></msup><mover><mrow><mi>f</mi></mrow><mo>‾</mo></mover><mi>f</mi></math></span> are absent in the Standard Model, however, they are present in several physics Beyond Standard Model (BSM) extensions, including those with vector-like fermions. In Effective Field Theories (EFTs), such as the Standard Model Effective Field Theory (SMEFT) and the Higgs Effective Field Theory (HEFT), these couplings appear at dimension 6 and can in general, be flavour-violating (FV). In the present work, we employ a bottom-up approach to investigate the FV in the lepton and quarks sectors through the di-Higgs effective couplings. We assume that all FV arises from this type of couplings and assume that the Yukawa couplings <span><math><msub><mrow><mi>Y</mi></mrow><mrow><mi>i</mi><mi>j</mi></mrow></msub></math></span> are given by their SM values, i.e. <span><math><msub><mrow><mi>Y</mi></mrow><mrow><mi>i</mi><mi>j</mi></mrow></msub><mo>=</mo><msqrt><mrow><mn>2</mn></mrow></msqrt><msub><mrow><mi>m</mi></mrow><mrow><mi>i</mi></mrow></msub><msub><mrow><mi>δ</mi></mrow><mrow><mi>i</mi><mi>j</mi></mrow></msub><mo>/</mo><mi>v</mi></math></span>. In the lepton sector, we set upper limits on the Wilson coefficients <span><math><msub><mrow><mi>C</mi></mrow><mrow><mi>l</mi><msup><mrow><mi>l</mi></mrow><mrow><mo>′</mo></mrow></msup></mrow></msub></math></span> from <span><math><mi>l</mi><mo>→</mo><mn>3</mn><msup><mrow><mi>l</mi></mrow><mrow><mo>′</mo></mrow></msup></math></span> decays, <span><math><mi>l</mi><mo>→</mo><mi>l</mi><mi>γ</mi></math></span> decays, muonium oscillations, the <span><math><msub><mrow><mo>(</mo><mi>g</mi><mo>−</mo><mn>2</mn><mo>)</mo></mrow><mrow><mi>μ</mi></mrow></msub></math></span> anomaly, LEP searches, muon conversion in nuclei, FV Higgs decays, and <em>Z</em> decays. We also make projections on some of these coefficients from Belle II, the Mu2e experiment and the LHC's High Luminosity (HL) run. In the quark sector, we set upper limits on the Wilson coefficients <span><math><msub><mrow><mi>C</mi></mrow><mrow><mi>q</mi><msup><mrow><mi>q</mi></mrow><mrow><mo>′</mo></mrow></msup></mrow></msub></math></span> from meson oscillations and from <em>B</em>-physics searches. A key takeaway from this study is that current and future experiments should set out to measure the effective di-Higgs couplings <span><math><msub><mrow><mi>C</mi></mrow><mrow><mi>f</mi><msup><mrow><mi>f</mi></mrow><mrow><mo>′</mo></mrow></msup></mrow></msub></math></span>, whether these couplings are FV or flavour-conserving. We also present a matching between our formalism and the SMEFT operators and show the bounds in both bases.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1008 ","pages":"Article 116694"},"PeriodicalIF":2.5,"publicationDate":"2024-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142434439","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2024-09-19DOI: 10.1016/j.nuclphysb.2024.116692
Boris Ivetić
A perturbative formulation of quantum electrodynamics is given in terms of geometrical invariants of the energy-momentum space, whose geometry is taken to be one of a constant curvature. The construction is relevant for different classes of noncommutativity: the Snyder model and the so called GUP models. For the Snyder model it is shown that all the amplitudes are finite at every order of the perturbation expansion.
{"title":"Diffeomorphisms of the energy-momentum space: Perturbative QED","authors":"Boris Ivetić","doi":"10.1016/j.nuclphysb.2024.116692","DOIUrl":"10.1016/j.nuclphysb.2024.116692","url":null,"abstract":"<div><div>A perturbative formulation of quantum electrodynamics is given in terms of geometrical invariants of the energy-momentum space, whose geometry is taken to be one of a constant curvature. The construction is relevant for different classes of noncommutativity: the Snyder model and the so called GUP models. For the Snyder model it is shown that all the amplitudes are finite at every order of the perturbation expansion.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1007 ","pages":"Article 116692"},"PeriodicalIF":2.5,"publicationDate":"2024-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S055032132400258X/pdfft?md5=6fc3cf4c03918e95bc97fae3f6f41de8&pid=1-s2.0-S055032132400258X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142311523","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2024-09-19DOI: 10.1016/j.nuclphysb.2024.116689
Allah Ditta , Xia Tiecheng , S.K. Maurya , G. Mustafa , Asif Mahmood , Saibal Ray
The foundation of this paper is to present a comparative study of the properties of anisotropic solutions for compact stars in the framework of modified gravity for the first time under the schemes of vanishing complexity, embedding class one, conformally flat and conformally Killing, where Q is the nonmetricity scalar and T is the trace of the energy-momentum tensor. The model is chosen in order to compare the results of the various forms and gravity theories. The and gravities in this model are then further simplified to depend on parameters . Then, we discussed several approaches to determining the spherically symmetric spacetime components. Schwarzschild geometry represents the exterior spacetime, while a Tolman-Kuchowiz spacetime is used to examine the spherically symmetric spacetime inside the interior geometry. Many properties of compact stars are investigated, like energy density, energy conditions, pressure profiles, sound speeds, gradients, adiabatic index, TOV equation, mass function, compactness, and redshift function are all carefully examined in order to complete the analysis. We have compiled results for both stable and unstable scenarios, derived from gravity theories categorized into various cases, with solutions considered under different frameworks such as Tolman-Kuchowiz spacetime, embedding class 1 spacetime, the vanishing complexity condition, the conformally flat condition, and the conformal Killing vector condition.
{"title":"Physical characteristics of anisotropic solutions in f(Q,T) gravity under the vanishing complexity, embedding class one, conformally flat and conformally Killing conditions","authors":"Allah Ditta , Xia Tiecheng , S.K. Maurya , G. Mustafa , Asif Mahmood , Saibal Ray","doi":"10.1016/j.nuclphysb.2024.116689","DOIUrl":"10.1016/j.nuclphysb.2024.116689","url":null,"abstract":"<div><div>The foundation of this paper is to present a comparative study of the properties of anisotropic solutions for compact stars in the framework of modified <span><math><mi>f</mi><mo>(</mo><mi>Q</mi><mo>,</mo><mi>T</mi><mo>)</mo></math></span> gravity for the first time under the schemes of vanishing complexity, embedding class one, conformally flat and conformally Killing, where <em>Q</em> is the nonmetricity scalar and <em>T</em> is the trace of the energy-momentum tensor. The model <span><math><mi>f</mi><mo>(</mo><mi>Q</mi><mo>,</mo><mi>T</mi><mo>)</mo><mo>=</mo><mi>ϕ</mi><mi>Q</mi><mo>+</mo><mi>α</mi><msup><mrow><mi>Q</mi></mrow><mrow><mi>n</mi><mo>+</mo><mn>1</mn></mrow></msup><mo>−</mo><mi>γ</mi><mrow><mo>(</mo><mn>1</mn><mo>−</mo><msup><mrow><mi>e</mi></mrow><mrow><mo>−</mo><mi>Q</mi><mo>/</mo><mi>γ</mi></mrow></msup><mo>)</mo></mrow><mo>+</mo><mi>β</mi><mi>T</mi></math></span> is chosen in order to compare the results of the various forms <span><math><mi>f</mi><mo>(</mo><mi>Q</mi><mo>,</mo><mi>T</mi><mo>)</mo></math></span> and <span><math><mi>f</mi><mo>(</mo><mi>Q</mi><mo>)</mo></math></span> gravity theories. The <span><math><mi>f</mi><mo>(</mo><mi>Q</mi><mo>,</mo><mi>T</mi><mo>)</mo></math></span> and <span><math><mi>f</mi><mo>(</mo><mi>Q</mi><mo>)</mo></math></span> gravities in this model are then further simplified to depend on parameters <span><math><mi>ϕ</mi><mo>,</mo><mspace></mspace><mi>α</mi><mo>,</mo><mspace></mspace><mi>γ</mi><mspace></mspace><mi>&</mi><mspace></mspace><mi>β</mi></math></span>. Then, we discussed several approaches to determining the spherically symmetric spacetime components. Schwarzschild geometry represents the exterior spacetime, while a Tolman-Kuchowiz spacetime is used to examine the spherically symmetric spacetime inside the interior geometry. Many properties of compact stars are investigated, like energy density, energy conditions, pressure profiles, sound speeds, gradients, adiabatic index, TOV equation, mass function, compactness, and redshift function are all carefully examined in order to complete the analysis. We have compiled results for both stable and unstable scenarios, derived from gravity theories categorized into various cases, with solutions considered under different frameworks such as Tolman-Kuchowiz spacetime, embedding class 1 spacetime, the vanishing complexity condition, the conformally flat condition, and the conformal Killing vector condition.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1007 ","pages":"Article 116689"},"PeriodicalIF":2.5,"publicationDate":"2024-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0550321324002554/pdfft?md5=7af363c7db5df7af056e4365ad0ac00c&pid=1-s2.0-S0550321324002554-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142311524","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}
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