Physics of the Dark Universe最新文献

{"title":"Compartmentalization and coexistence in the dark sector of the universe","authors":"Andronikos Paliathanasis ,&nbsp;Kevin Duffy ,&nbsp;Amlan Halder ,&nbsp;Amare Abebe","doi":"10.1016/j.dark.2024.101750","DOIUrl":"10.1016/j.dark.2024.101750","url":null,"abstract":"<div><div>We revise the cosmological interaction between dark energy and dark matter. More precisely, we focus on models that support compartmentalization or coexistence in the dark sector of the universe. Within the framework of a homogeneous and isotropic, spatially flat Friedmann–Lemaître–Robertson–Walker geometry, we analyse the asymptotic behaviour of the physical parameters for two interacting models, where dark energy and dark matter have constant equations of state parameters, in the presence of dark radiation, when dark energy is described by a quintessence scalar field. For each model, we determine the asymptotic solutions and attempt to understand how the interaction affects the cosmological evolution and history.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"47 ","pages":"Article 101750"},"PeriodicalIF":5.0,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142756934","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}

{"title":"General constraints on Tsallis holographic dark energy from observational data","authors":"Artyom V. Astashenok,&nbsp;Alexander S. Tepliakov","doi":"10.1016/j.dark.2024.101747","DOIUrl":"10.1016/j.dark.2024.101747","url":null,"abstract":"<div><div>We investigate Tsallis holographic dark energy (THDE) model in light of modern observations of supernovae, Hubble parameter measurements, data for baryon acoustic oscillations and fluctuations of matter density. The dark energy density for THDE model is written as <span><math><mrow><msub><mrow><mi>ρ</mi></mrow><mrow><mi>d</mi></mrow></msub><mo>=</mo><mn>3</mn><msup><mrow><mi>C</mi></mrow><mrow><mn>2</mn></mrow></msup><mo>/</mo><msup><mrow><mi>L</mi></mrow><mrow><mn>4</mn><mo>−</mo><mn>2</mn><mi>γ</mi></mrow></msup></mrow></math></span> where <span><math><mi>C</mi></math></span> and <span><math><mi>γ</mi></math></span> are some constants. Scale <span><math><mi>L</mi></math></span> is infrared cut-off length for which we use the event horizon. For analysis of type Ia supernovae (SNeIa) data Pantheon+ samples are involved. Dark Energy Spectroscopic Instrument (DESI) 2024 measurements serves as source of data about ratios between sound horizon <span><math><msub><mrow><mi>r</mi></mrow><mrow><mi>d</mi></mrow></msub></math></span> and Hubble (<span><math><msub><mrow><mi>d</mi></mrow><mrow><mi>H</mi></mrow></msub></math></span>) or volume averaged (<span><math><msub><mrow><mi>d</mi></mrow><mrow><mi>V</mi></mrow></msub></math></span>) distances. The updated dataset of Hubble parameter for various redshift is also used in our analysis. Finally we consider the dependence of matter density fluctuations in past from redshift. The standard strategy of <span><math><msup><mrow><mi>χ</mi></mrow><mrow><mn>2</mn></mrow></msup></math></span> minimizing allows to estimate the optimal values of parameters (<span><math><msub><mrow><mi>Ω</mi></mrow><mrow><mi>d</mi><mi>e</mi></mrow></msub></math></span> and <span><math><msub><mrow><mi>H</mi></mrow><mrow><mn>0</mn></mrow></msub></math></span>) for some fixed values of <span><math><mi>C</mi></math></span> and <span><math><mi>γ</mi></math></span>. One note that best-fit values for parameters <span><math><msub><mrow><mi>H</mi></mrow><mrow><mn>0</mn></mrow></msub></math></span> from Hubble parameter and SNeIa data are more close than in standard <span><math><mi>Λ</mi></math></span>CDM model for some <span><math><mi>C</mi></math></span> and <span><math><mi>γ</mi></math></span> although problem of Hubble tension remains unsolved. The combined data analysis also gives slightly better results in comparison with standard cosmology. We include in our consideration the possible interaction between matter and holographic component and estimate the acceptable interval of model parameters in this case.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"47 ","pages":"Article 101747"},"PeriodicalIF":5.0,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745284","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}

{"title":"The impact of the X17 boson on particle physics anomalies: Muon anomalous magnetic moment, Lamb shift and W mass","authors":"A. Capolupo,&nbsp;A. Quaranta,&nbsp;R. Serao","doi":"10.1016/j.dark.2024.101748","DOIUrl":"10.1016/j.dark.2024.101748","url":null,"abstract":"<div><div>We show that the <span><math><msub><mrow><mi>X</mi></mrow><mrow><mn>17</mn></mrow></msub></math></span> vector boson, introduced to explain the <span><math><mrow><msup><mrow></mrow><mrow><mn>8</mn></mrow></msup><mi>Be</mi></mrow></math></span> anomalous decay, could play a role in the muon’s (electron’s) anomalous magnetic moment and the muonic Lamb shift anomaly. We compute an upper bound on the couplings of <span><math><msub><mrow><mi>X</mi></mrow><mrow><mn>17</mn></mrow></msub></math></span> to leptons and nucleons, analyzing these anomalies. We further constrain the possible kinetic mixing with the <span><math><mrow><mi>U</mi><msub><mrow><mrow><mo>(</mo><mn>1</mn><mo>)</mo></mrow></mrow><mrow><mi>Y</mi></mrow></msub></mrow></math></span> boson of the Standard Model by using the latest available data on the <span><math><mi>W</mi></math></span> boson mass.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"47 ","pages":"Article 101748"},"PeriodicalIF":5.0,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745214","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}

{"title":"Precision prediction of a democratic up-family philic KSVZ axion model at the LHC","authors":"Anupam Ghosh ,&nbsp;Partha Konar","doi":"10.1016/j.dark.2024.101746","DOIUrl":"10.1016/j.dark.2024.101746","url":null,"abstract":"<div><div>In this work, we study the <span><math><mrow><mi>S</mi><mi>U</mi><msub><mrow><mrow><mo>(</mo><mn>2</mn><mo>)</mo></mrow></mrow><mrow><mi>L</mi></mrow></msub></mrow></math></span> singlet complex scalar extended KSVZ model that, in addition to providing a natural solution to the strong-CP problem, furnishes two components of dark matter that satisfy observer relic density without fine-tuning the model’s parameters. A colored vector-like quark (VLQ) is naturally present in the KSVZ axion model, providing a rich dark matter and collider phenomenology. In this extended model, scalar dark matter interacts with the Standard Model up-type quarks (up, charm, top) through VLQ. We explore the possibility of democratic Yukawa interaction of the VLQ with all up-type quarks and scalar dark matter candidate. We also employ next-to-leading order NLO-QCD correction on dominant production channels for VLQ pair production to study a unique search at the LHC, generating a pair of boosted tops with sizeable missing transverse momentum. Such corrections are significant and reduce factorization and renormalization scale uncertainties substantially. The NLO fixed order results are matched with the Pythia8 parton shower. After being pair-produced, each VLQ decays into a dark matter and a top quark. We conducted a multivariate analysis using jet substructure variables of boosted top fatjets with a significant missing transverse momentum signal. This analysis allows us to explore a substantial parameter space of this model at the 14 TeV LHC.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"47 ","pages":"Article 101746"},"PeriodicalIF":5.0,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745283","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}

{"title":"Properties of white dwarf stars within rainbow gravity","authors":"Takol Tangphati ,&nbsp;Grigoris Panotopoulos ,&nbsp;Ayan Banerjee ,&nbsp;Anirudh Pradhan","doi":"10.1016/j.dark.2024.101741","DOIUrl":"10.1016/j.dark.2024.101741","url":null,"abstract":"<div><div>We investigate the properties of anisotropic white dwarf stars within the rainbow gravity adopting for matter content the Chandrasekhar model based on an ideal Fermi gas at zero temperature. We study in detail the effects of the anisotropic factor on stellar mass and radius, the speed of sound, and the relativistic adiabatic index in both radial and tangential directions. We find that causality is never violated, whereas the stability criterion based on the relativistic adiabatic index is not met when the objects are characterized by a positive anisotropic factor close to the Chandrasekhar limit. We present this significant observation here for the first time, to the best of our knowledge.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"47 ","pages":"Article 101741"},"PeriodicalIF":5.0,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745281","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}

{"title":"Particle dynamics and the accretion disk around a Self-dual Black Hole immersed in a magnetic field in Loop Quantum Gravity","authors":"Uktamjon Uktamov ,&nbsp;Mirzabek Alloqulov ,&nbsp;Sanjar Shaymatov ,&nbsp;Tao Zhu ,&nbsp;Bobomurat Ahmedov","doi":"10.1016/j.dark.2024.101743","DOIUrl":"10.1016/j.dark.2024.101743","url":null,"abstract":"<div><div>In this paper, we study the motion of magnetic dipoles and electrically charged particles in the vicinity of a self-dual black hole in Loop Quantum Gravity (LQG) immersed in an external asymptotically uniform magnetic field. We explore the effects of the quantum correction parameter and electromagnetic interactions on the particle geodesics. We derive the field equations and determine the electromagnetic four-vector potential for the case of a self-dual black hole in LQG. We investigate the innermost stable circular orbits (ISCOs) for both magnetic dipoles and electrically charged particles in detail, demonstrating that the quantum correction parameter significantly influences on the ISCO radius, causing it to shrink. Additionally, we show that the ISCO radius of magnetic dipoles is greater than that of electrically charged particles due to the magnetic field interaction. We investigate the ISCO parameters (i.e., <span><math><msub><mrow><mi>r</mi></mrow><mrow><mi>I</mi><mi>S</mi><mi>C</mi><mi>O</mi></mrow></msub></math></span>, <span><math><msub><mrow><mi>l</mi></mrow><mrow><mi>I</mi><mi>S</mi><mi>C</mi><mi>O</mi></mrow></msub></math></span>, <span><math><msub><mrow><mi>E</mi></mrow><mrow><mi>I</mi><mi>S</mi><mi>C</mi><mi>O</mi></mrow></msub></math></span>, <span><math><msub><mrow><mi>v</mi></mrow><mrow><mi>I</mi><mi>S</mi><mi>C</mi><mi>O</mi></mrow></msub></math></span>, and <span><math><msub><mrow><mi>Ω</mi></mrow><mrow><mi>I</mi><mi>S</mi><mi>C</mi><mi>O</mi></mrow></msub></math></span>) for magnetic dipoles and electrically charged particles, providing detailed values. Furthermore, we examine the trajectories of charged particles under various scenarios resulting from the quantum correction parameter <span><math><mi>P</mi></math></span>. Finally, analyzing the ISCO parameters that define the inner edge of the accretion disk, we explore the accretion disk around a self-dual black hole in LQG. We delve into the electromagnetic radiation flux, temperature, and differential luminosity as radiation properties of the accretion disk in detail. We show that the quantum correction parameter shifts the profile of the electromagnetic flux and accretion disk temperature towards the central object, leading to a slight increase in these quantities.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"47 ","pages":"Article 101743"},"PeriodicalIF":5.0,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745285","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}

{"title":"Inflation with shallow dip and primordial black holes","authors":"Bao-Min Gu ,&nbsp;Fu-Wen Shu ,&nbsp;Ke Yang","doi":"10.1016/j.dark.2024.101744","DOIUrl":"10.1016/j.dark.2024.101744","url":null,"abstract":"<div><div>Primordial black holes may arise through ultra slow-roll inflation. In this work we study a toy model of ultra slow-roll inflation with a shallow dip. The ultra slow-roll stage enhances the curvature perturbations and thus the primordial scalar power spectrum. We analyze the features of the power spectrum numerically and analytically, and then give a rough estimate of the lower and upper bound of the enhancement. These large perturbations also produce second order gravitational waves, which are in the scope of future observations.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"47 ","pages":"Article 101744"},"PeriodicalIF":5.0,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142721399","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}

{"title":"DarkMatters: A powerful tool for WIMPy analysis","authors":"Michael Sarkis ,&nbsp;Geoff Beck","doi":"10.1016/j.dark.2024.101745","DOIUrl":"10.1016/j.dark.2024.101745","url":null,"abstract":"<div><div>We introduce a new software package, <span>DarkMatters</span>, which has been designed to facilitate the calculation of all aspects of indirect dark matter detection of WIMPs in astrophysical settings. Two primary features of this code are the improvement in performance compared to existing tools, and higher levels of accuracy when determining radio synchrotron emission associated with WIMP annihilations, both of which are enabled by the employment of a set of modern and novel numerical techniques. The code also includes functionality for a multi-wavelength set of output products including gamma-ray, radio and neutrino fluxes which can be saved in common formats used by the astronomical community, such as the FITS data file format. The calculations may be tailored to work with a wide range of astrophysical target structures, from dwarf galaxies to galaxy clusters, and the configuration of the underlying calculations is managed by a set of key–value dictionary entries that are easy to understand and use. The code base is publicly accessible through an online repository with a permissive MIT source code licence.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"47 ","pages":"Article 101745"},"PeriodicalIF":5.0,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745282","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}

{"title":"Holographic principle inspired dark energy description of unified early and late universe in viscous mimetic gravity","authors":"G.S. Khadekar ,&nbsp;Saibal Ray ,&nbsp;Aritra Sanyal ,&nbsp;Praveen Kumar Dhankar","doi":"10.1016/j.dark.2024.101742","DOIUrl":"10.1016/j.dark.2024.101742","url":null,"abstract":"<div><div>In this study, we explore the mimetic matter model proposed by Chamseddine and Mukhanov (2013), utilizing the holographic principle to coherently describe both the early and late universe when bulk viscosity is present in the inhomogeneous equation of state. Our examination of the universe’s evolution is based on the generalized infrared-cutoff holographic dark energy model detailed by Nojiri and Odintsov (2017) within the context of the flat FRW model. From a holographic perspective, we derive the energy conservation equation incorporating mimetic matter through a viscous holographic fluid model. Furthermore, we analyze various scenarios of bulk viscosity by assuming a constant equation of state parameter and derive the infrared cut-off expression in terms of the particle horizon. We demonstrate that within the framework of mimetic gravity, there is a class of solutions comparable to those in General Relativity, with an additional contribution from a non-relativistic mimetic matter component. These solutions can effectively describe dark matter.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"47 ","pages":"Article 101742"},"PeriodicalIF":5.0,"publicationDate":"2024-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142721911","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}

{"title":"Cosmic thermodynamics of interacting scenario of EBEC dark matter and holographic dark energy","authors":"Zoya Khan ,&nbsp;Abdul Jawad ,&nbsp;Shamaila Rani","doi":"10.1016/j.dark.2024.101739","DOIUrl":"10.1016/j.dark.2024.101739","url":null,"abstract":"<div><div>The current article is base on the concept of interacting dark matter in the framework of Extended Bose–Einstein condensate dark matter with the holographic dark energy model. In the scenario of dark energy and different cases of the dark matter interaction term, we discuss the behavior of the cosmological parameters, thermodynamics and thermal equilibrium conditions. To investigate the accelerated expansion or decelerated phase of the universe, we consider the observational values from literature of all parameters and graphically examine the different phases of the cosmological parameters which are deceleration, equation of state, jerk and snap parameters. We also graphically discuss the stability condition of the generalized second law of thermodynamics and thermal equilibrium condition by utilizing the observational values. We conclude that for all cases the deceleration parameter represents the accelerated behavior and for all cases the universe is stable for generalized second law of thermodynamics and for two cases the thermal equilibrium condition is stable and for third case it shows the partial stability.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"47 ","pages":"Article 101739"},"PeriodicalIF":5.0,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142721910","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}