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Charge ratio of cosmic ray muons in momentum range ∼ 1 to 3 GeV/c 动量范围 ∼ 1 至 3 GeV/c 的宇宙射线μ介子的电荷比
IF 6.4 2区 物理与天体物理
Journal of Cosmology and Astroparticle Physics Pub Date : 2024-11-27 DOI: 10.1088/1475-7516/2024/11/056
Raj Shah, J.M. John, Suryanarayan Mondal, S. Pethuraj, G. Majumder and P. Shukla
{"title":"Charge ratio of cosmic ray muons in momentum range ∼ 1 to 3 GeV/c","authors":"Raj Shah, J.M. John, Suryanarayan Mondal, S. Pethuraj, G. Majumder and P. Shukla","doi":"10.1088/1475-7516/2024/11/056","DOIUrl":"https://doi.org/10.1088/1475-7516/2024/11/056","url":null,"abstract":"This work presents the measurements of the cosmic muon charge ratio as a function of full azimuthal angle and momentum within the range of 0.8 to 3.0 GeV/c, using the mini-ICAL detector. The detector, comprising 10 layers of RPCs, has collected cosmic muon data since August 2018 till recent time, at an altitude of 160 m above sea level at the Inter-Institutional Center for High Energy Physics in Madurai, India (9∘56' N, 78∘00' E). The muon charge identification is achieved through the use of a magnetic field of strength 1.4 T. The analysis shows that the cosmic muon charge ratio, Rμ = Nμ+/Nμ-, ranges from 1.1 to 1.2 and has small dependency on the zenith angle. The charge ratio's dependence on momentum and azimuthal angle is thoroughly examined for a wide range of zenith angle upto 50∘. These measurements are compared with the predictions from various combinations of different hadronic models in CORSIKA extensive air shower simulations.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"19 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142718230","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Cosmological simulations of scale-dependent primordial non-Gaussianity 尺度相关原始非高斯性的宇宙学模拟
IF 6.4 2区 物理与天体物理
Journal of Cosmology and Astroparticle Physics Pub Date : 2024-11-27 DOI: 10.1088/1475-7516/2024/11/053
Marco Baldi, Emanuele Fondi, Dionysios Karagiannis, Lauro Moscardini, Andrea Ravenni, William R. Coulton, Gabriel Jung, Michele Liguori, Marco Marinucci, Licia Verde, Francisco Villaescusa-Navarro and Benjamin D. Wandelt
{"title":"Cosmological simulations of scale-dependent primordial non-Gaussianity","authors":"Marco Baldi, Emanuele Fondi, Dionysios Karagiannis, Lauro Moscardini, Andrea Ravenni, William R. Coulton, Gabriel Jung, Michele Liguori, Marco Marinucci, Licia Verde, Francisco Villaescusa-Navarro and Benjamin D. Wandelt","doi":"10.1088/1475-7516/2024/11/053","DOIUrl":"https://doi.org/10.1088/1475-7516/2024/11/053","url":null,"abstract":"We present the results of a set of cosmological N-body simulations with standard ΛCDM cosmology but characterized by a scale-dependent primordial non-Gaussianity of the local type featuring a power-law dependence of the fNLloc(k) at large scales followed by a saturation to a constant value at smaller scales where non-linear growth leads to the formation of collapsed cosmic structures. Such models are built to ensure consistency with current Cosmic Microwave Background bounds on primordial non-Gaussianity yet allowing for large effects of the non-Gaussian statistics on the properties of non-linear structure formation. We show the impact of such scale-dependent non-Gaussian scenarios on a wide range of properties of the resulting cosmic structures, such as the non-linear matter power spectrum, the halo and sub-halo mass functions, the concentration-mass relation, the halo and void density profiles, and we highlight for the first time that some of these models might mimic the effects of Warm Dark Matter for several of such observables.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"68 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142718229","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Tomography of flavoured leptogenesis with primordial blue gravitational waves 利用原始蓝色引力波对有味轻生进行断层扫描
IF 6.4 2区 物理与天体物理
Journal of Cosmology and Astroparticle Physics Pub Date : 2024-11-27 DOI: 10.1088/1475-7516/2024/11/051
Marco Chianese, Satyabrata Datta, Rome Samanta and Ninetta Saviano
{"title":"Tomography of flavoured leptogenesis with primordial blue gravitational waves","authors":"Marco Chianese, Satyabrata Datta, Rome Samanta and Ninetta Saviano","doi":"10.1088/1475-7516/2024/11/051","DOIUrl":"https://doi.org/10.1088/1475-7516/2024/11/051","url":null,"abstract":"We explore a scenario where an early epoch of matter domination is driven by the mass scale MN of the right-handed neutrinos, which also characterizes the different flavour regimes of leptogenesis. Such a matter-domination epoch gives rise to peculiar spectral imprints on primordial Gravitational Waves (GWs) produced during inflation. We point out that the characteristic spectral features are detectable in multiple frequency bands with current and future GW experiments in case of Blue GWs (BGWs) described by a power-law with a positive spectral index (nT > 0) and an amplitude compatible with Cosmic Microwave Background (CMB) measurements at the CMB scale. We find that the three-flavour leptogenesis regime with MN ≲ 109 GeV imprints BGWs more prominently than the two-flavour and one-flavour regimes characterized by a higher right-handed neutrino mass. In particular, a two-flavour (three-flavour) leptogenesis regime is expected to leave distinct imprints in the mHz–Hz (μHz–mHz) band. Moreover, we translate the current Big Bang Nucleosynthesis (BBN) and LIGO limits on the GW energy density into constraints on the flavour leptogenesis parameter space for different GW spectral indices nT. We provide a rigorous statistical analysis of how the future GW detectors would be conjointly able to distinguish the flavour regimes. Interestingly, the scenario also offers unique GW signals testable in the next LIGO run with a correlated signature in the PTA frequency band with an amplitude comparable to the one expected from supermassive black holes.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"37 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142718366","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Limits on the parameter space of (3+2) sterile neutrino scenario by IceCube data 冰立方数据对（3+2）不育中微子情景参数空间的限制
IF 6.4 2区 物理与天体物理
Journal of Cosmology and Astroparticle Physics Pub Date : 2024-11-27 DOI: 10.1088/1475-7516/2024/11/059
Emilse Cabrera, Arman Esmaili and Alexander A. Quiroga
{"title":"Limits on the parameter space of (3+2) sterile neutrino scenario by IceCube data","authors":"Emilse Cabrera, Arman Esmaili and Alexander A. Quiroga","doi":"10.1088/1475-7516/2024/11/059","DOIUrl":"https://doi.org/10.1088/1475-7516/2024/11/059","url":null,"abstract":"The neutrino sector of the standard model of particles can contain more than one sterile neutrino states. Generally, existence of more sterile states leads to better, or at least equally good, fit to the short baseline anomalous data due to the larger number of parameters and interferences which create features in the oscillation pattern. However, for experiments like IceCube, where the sterile states distort the oscillation pattern of high energy atmospheric neutrinos through parametric and MSW resonances, addition of more sterile states leads to a more intense effect. Although the limits on one additional sterile neutrino state by IceCube data have been studied in the literature, bounds on the models with more sterile states are lacking. We analyze the one-year data set of atmospheric neutrinos collected by IceCube during the 2011–2012 and derive the limits on the parameter space of (3+2) scenario with two sterile neutrino states, taking into account the relevant systematic and statistical uncertainties and atmospheric neutrino flux variants. To facilitate the joint analysis of IceCube and short baseline data, we provide the table of χ2 values from IceCube's data analysis as function of the parameters.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"7 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142718231","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Double-well inflation: observational constraints and theoretical implications 双井膨胀：观测约束和理论影响
IF 6.4 2区 物理与天体物理
Journal of Cosmology and Astroparticle Physics Pub Date : 2024-11-27 DOI: 10.1088/1475-7516/2024/11/055
G. Rodrigues, J.G. Rodrigues, F.B.M. dos Santos and J.S. Alcaniz
{"title":"Double-well inflation: observational constraints and theoretical implications","authors":"G. Rodrigues, J.G. Rodrigues, F.B.M. dos Santos and J.S. Alcaniz","doi":"10.1088/1475-7516/2024/11/055","DOIUrl":"https://doi.org/10.1088/1475-7516/2024/11/055","url":null,"abstract":"We revisit the small field double-well inflationary model and investigate its observational viability in light of the current Cosmic Microwave Background data. In particular, considering scenarios with minimal and nonminimal coupling between the inflaton field and the Ricci scalar, we perform a Monte Carlo Markov chain analysis to probe the model's parameter space. We also investigate the consequences of the cosmological results in the canonical type-I seesaw mechanism context and obtain constraints on the vacuum expectation value of the inflaton field, together with the amplitude of the coupling to gravity in the nonminimal case. We employ a Bayesian procedure to compare the model's predictions with the Starobinsky inflationary scenario and find a strong statistical preference for the latter against the minimal and nonminimal coupled double-well scenario.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"198 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142718369","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Pseudo-Nambu-Goldstone boson production from inflaton coupling during reheating 再加热过程中的流入耦合产生伪南布-金石玻色子
IF 6.4 2区 物理与天体物理
Journal of Cosmology and Astroparticle Physics Pub Date : 2024-11-27 DOI: 10.1088/1475-7516/2024/11/058
Kunio Kaneta, Sung Mook Lee, Kin-ya Oda and Tomo Takahashi
{"title":"Pseudo-Nambu-Goldstone boson production from inflaton coupling during reheating","authors":"Kunio Kaneta, Sung Mook Lee, Kin-ya Oda and Tomo Takahashi","doi":"10.1088/1475-7516/2024/11/058","DOIUrl":"https://doi.org/10.1088/1475-7516/2024/11/058","url":null,"abstract":"The existence of pseudo-Nambu-Goldstone boson (pNGB) fields is a common feature in many models beyond the Standard Model, characterized by their exclusive derivative couplings. This paper investigates a scenario where a pNGB is coupled to the inflaton field during the reheating phase of the early universe. We calculate the perturbative decay rate of a coherently oscillating inflaton into pNGBs on a general basis, considering both constant and field-dependent couplings with monomial potentials at the minimum. As a concrete application, we explore the production of axions when the radial mode of the Peccei-Quinn (PQ) scalar serves as the inflaton, particularly in the presence of a large gravitational non-minimal coupling. Our findings suggest that the presence of pNGBs during reheating can lead to significant non-thermal relics, offering new constraints on inflationary reheating models and providing potential observational signatures in the form of dark radiation.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"4 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142718373","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Gravitational reheating in Starobinsky inflation 斯塔罗宾斯基膨胀中的引力再加热
IF 6.4 2区 物理与天体物理
Journal of Cosmology and Astroparticle Physics Pub Date : 2024-11-27 DOI: 10.1088/1475-7516/2024/11/050
Gláuber C. Dorsch, Luiz Miranda and Nelson Yokomizo
{"title":"Gravitational reheating in Starobinsky inflation","authors":"Gláuber C. Dorsch, Luiz Miranda and Nelson Yokomizo","doi":"10.1088/1475-7516/2024/11/050","DOIUrl":"https://doi.org/10.1088/1475-7516/2024/11/050","url":null,"abstract":"We investigate the possibility of achieving post-inflationary reheating exclusively through the gravitational interaction in Starobinsky inflation, which itself assumes nothing but gravity. We consider the possibility that the reheating sector couples to gravity via a non-minimal coupling. Our analysis is performed both in a perturbative and in a non-perturbative approach, where particle production is computed from Bogoliubov coefficients. Our findings indicate that, for a minimal coupling, a reheating temperature Treh ∼ 108 GeV is obtained, with a reheating duration of approximately 21 e-folds. We also show that non perturbative gravitational production during preheating can lead to maximum temperatures of the order of 1012 GeV. This shows that the gravitational interaction could be the sole responsible for reheating the Universe after inflation, without the need to assume other ad hoc inflaton interactions.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"370 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142718365","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Dark photon constraints from CMB temperature anisotropies 从 CMB 温度各向异性看暗光子的制约因素
IF 6.4 2区 物理与天体物理
Journal of Cosmology and Astroparticle Physics Pub Date : 2024-11-27 DOI: 10.1088/1475-7516/2024/11/049
Andres Aramburo-Garcia, Kyrylo Bondarenko, Alexey Boyarsky, Pavlo Kashko, Josef Pradler, Anastasia Sokolenko, Roi Kugel, Matthieu Schaller and Joop Schaye
{"title":"Dark photon constraints from CMB temperature anisotropies","authors":"Andres Aramburo-Garcia, Kyrylo Bondarenko, Alexey Boyarsky, Pavlo Kashko, Josef Pradler, Anastasia Sokolenko, Roi Kugel, Matthieu Schaller and Joop Schaye","doi":"10.1088/1475-7516/2024/11/049","DOIUrl":"https://doi.org/10.1088/1475-7516/2024/11/049","url":null,"abstract":"The resonant conversion, within the inter-galactic medium, of regular photons into dark photons amplifies the anisotropy observed in the CMB, thereby imposing stringent constraints on the existence of light dark photons. In this study, we investigate the impact of light dark photons, with masses in the range 3 × 10-15 eV < mA' < 3 × 10-12 eV on the power spectrum of temperature anisotropies within the cosmic microwave background (CMB) radiation utilizing the state-of-the-art large-volume FLAMINGO cosmological simulations. Our results show that using full Planck data, one can expect the existing constraints on the dark photon mixing parameter in this mass range to improve by an order of magnitude.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"43 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142718364","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Spectrum of primordial gravitational waves in the presence of a cosmic string 宇宙弦存在下的原始引力波频谱
IF 6.4 2区 物理与天体物理
Journal of Cosmology and Astroparticle Physics Pub Date : 2024-11-27 DOI: 10.1088/1475-7516/2024/11/048
S. Azar Ag Ghaleh, A.M. Abbassi and M.H. Abbassi
{"title":"Spectrum of primordial gravitational waves in the presence of a cosmic string","authors":"S. Azar Ag Ghaleh, A.M. Abbassi and M.H. Abbassi","doi":"10.1088/1475-7516/2024/11/048","DOIUrl":"https://doi.org/10.1088/1475-7516/2024/11/048","url":null,"abstract":"In this paper we consider an inflating universe with long straight cosmic string along z-axis. We demonstrate that cosmic string's effect can be treated as a perturbation on the background of FRW metric. By performing cosmological perturbations on this inflating cosmic string background, we derived the linearized Einstein field equations. We show that at leading order (neglecting the mixing terms of cosmic string perturbations with gravitational tensor perturbations), the cosmic string appears as an inhomogeneous term on the right hand side of wave equation for tensor perturbations. Finally, by finding analytical solution of the wave equation for slow-roll inflation, we illustrate its impact on the spectrum of primordial gravitational waves.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"20 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142718371","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Leptogenesis via bubble collisions 通过气泡碰撞的eptogenesis
IF 6.4 2区 物理与天体物理
Journal of Cosmology and Astroparticle Physics Pub Date : 2024-11-26 DOI: 10.1088/1475-7516/2024/11/047
Martina Cataldi and Bibhushan Shakya
{"title":"Leptogenesis via bubble collisions","authors":"Martina Cataldi and Bibhushan Shakya","doi":"10.1088/1475-7516/2024/11/047","DOIUrl":"https://doi.org/10.1088/1475-7516/2024/11/047","url":null,"abstract":"We present a novel realization of leptogenesis from the decays of sterile (right-handed) neutrinos (RHNs) produced from runaway bubble collisions at a first order phase transition. Such configurations can produce heavy RHNs with mass many orders of magnitude above the scale of symmetry breaking as well as the temperature of the plasma, thereby enabling high scale leptogenesis without the need for high reheat temperatures while also naturally suppressing washout effects. This mechanism is also efficient for RHN masses ≳ 1014 GeV, the natural scale for type-I seesaw with 𝒪(1) couplings, where standard thermal leptogenesis faces strong suppression from washout processes in equilibrium. The corresponding phase transitions are at scales ≳ 109 GeV and produce gravitational wave signals that could be detected by future experiments.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"198 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142713036","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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