Nuclear Physics B最新文献

{"title":"BTZ and thermal AdS torus partition functions","authors":"Roshan Kaundinya ,&nbsp;Omkar Vinayak Nippanikar ,&nbsp;Akash Singh ,&nbsp;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}

{"title":"Equivalence of deformations of Berglund Hübsch mirror pairs","authors":"Alexander A. Belavin ,&nbsp;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}

{"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}

{"title":"Anisotropic Durgapal-Fuloria compact stars in f(R) gravity","authors":"Rajesh Kumar ,&nbsp;S.K. Maurya ,&nbsp;Abdelghani Errehymy ,&nbsp;G. Mustafa ,&nbsp;Abdel-Haleem Abdel-Aty ,&nbsp;H.I. Alrebdi ,&nbsp;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}

{"title":"Flavor violating di-Higgs couplings","authors":"Fayez Abu-Ajamieh ,&nbsp;Marco Frasca ,&nbsp;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}

{"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}

{"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 ,&nbsp;Xia Tiecheng ,&nbsp;S.K. Maurya ,&nbsp;G. Mustafa ,&nbsp;Asif Mahmood ,&nbsp;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>&amp;</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}

{"title":"A complex singlet extension of the Standard Model with a singlet fermion dark matter","authors":"Gi-Chol Cho ,&nbsp;Chikako Idegawa ,&nbsp;Rie Inumiya","doi":"10.1016/j.nuclphysb.2024.116688","DOIUrl":"10.1016/j.nuclphysb.2024.116688","url":null,"abstract":"<div><p>We examine a complex singlet scalar extension of the Standard Model (CxSM) with an extra singlet fermion. Both the singlet scalar and fermion are dark matter (DM) candidates. It is known that although the scalar potential in the CxSM can realize strong first-order electroweak phase transition, the scalar DM included in the model gives only a tiny amount of the relic density compared to the observed one. Therefore, a fermion DM is introduced to compensate for the lack of relic density. We find that the scattering of the fermion DM and nucleons is sufficiently suppressed when the masses of scalar mediators are degenerate, as is the case of the scalar DM. We show the range of a combination of the mass and the Yukawa coupling of the fermion DM, which satisfies both the observed relic density and conditions of strong first-order electroweak phase transition.</p></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1007 ","pages":"Article 116688"},"PeriodicalIF":2.5,"publicationDate":"2024-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0550321324002542/pdfft?md5=b9e4745f52b2d93d690e6c02d9040c39&pid=1-s2.0-S0550321324002542-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142269018","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}

{"title":"Flat limit of massless scalar scattering in AdS2","authors":"Sarthak Duary","doi":"10.1016/j.nuclphysb.2024.116687","DOIUrl":"10.1016/j.nuclphysb.2024.116687","url":null,"abstract":"<div><p>We explore the flat limit of massless scalar scattering in <span><math><msub><mrow><mi>AdS</mi></mrow><mrow><mn>2</mn></mrow></msub></math></span>. We derive the <span><math><mn>1</mn><mo>→</mo><mn>1</mn></math></span> <span><math><mi>S</mi></math></span>-matrix from the CFT 2-point function. We show a key property of the <span><math><mn>2</mn><mo>→</mo><mn>2</mn></math></span> <span><math><mi>S</mi></math></span>-matrix in 2<em>d</em>, where the contact interaction in the flat limit gives momentum conserving delta function. We show the factorization of the <span><math><mi>n</mi><mo>→</mo><mi>n</mi></math></span> <span><math><mi>S</mi></math></span>-matrix for integrable models in the flat limit, focusing on contact interactions. We calculate the <span><math><mi>S</mi></math></span>-matrix by linking the CFT operator on the AdS boundary to the scattering state in flat-space. We use bulk operator reconstruction to study massless scalar scattering in the flat limit and solve the Klein-Gordon equation in global <span><math><msub><mrow><mi>AdS</mi></mrow><mrow><mn>2</mn></mrow></msub></math></span> for the massless scalar field. The solution is simple, involving a pure phase in global time and a sinusoidal function in the radial coordinate. This simplicity also extends to the smearing function, allowing us to map the scattering state to the CFT operator while taking AdS corrections into account.</p></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1007 ","pages":"Article 116687"},"PeriodicalIF":2.5,"publicationDate":"2024-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0550321324002530/pdfft?md5=06b9b2ed4f62c81782c84ef23949f708&pid=1-s2.0-S0550321324002530-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142269020","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}

{"title":"Thermodynamic relation of accelerating black holes in anti-de Sitter spacetime","authors":"Chong Oh Lee","doi":"10.1016/j.nuclphysb.2024.116686","DOIUrl":"10.1016/j.nuclphysb.2024.116686","url":null,"abstract":"<div><p>We consider accelerating black holes in four-dimensional anti-de Sitter spacetime and investigate the extremality relations by examining perturbative corrections to both the entropy of black holes and their extremality bounds. It is shown that the so-called Goon and Penco (univeral) relation is also valid for accelerating black holes. Furthermore, it is found that an appropriate matching condition is necessary between the perturbation parameter of the relation with the perturbative correction to such black holes, and the parameter with information about the conical deficits on the north and south poles with the cosmic string tensions in order to satisfy the extremality relations. This result indicates that the extremality (univeral) relation of a class of accelerating black holes holds exhibit behavior similar to the Weak Gravity Conjecture.</p></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1007 ","pages":"Article 116686"},"PeriodicalIF":2.5,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0550321324002529/pdfft?md5=46546f095cb95288118688c94fd83535&pid=1-s2.0-S0550321324002529-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142255679","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}