Article
Physics, Particles & Fields
Shahar Hod
Summary: It is conjectured that circular trajectories around central compact objects have a lower bound for the time-to-mass ratio, where the orbital period and mass of the central object are related by T-infinity/M > C. This paper proves that this bound is respected by circular orbits around central naked singularities. Furthermore, it is shown that the orbital-time-to-mass ratio remains finite even in the r -> 0 limit for super-spinning singularities, with the shortest orbital period given by T-infinity/M = 27r.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Astronomy & Astrophysics
Astrid Eichhorn, Martin Pauly
Summary: This research suggests a direct link between the nature of dark matter and the fundamental quantum structure of spacetime in the asymptotic-safety framework. A toy model for the visible Higgs-Yukawa sector of the Standard Model, coupled to a dark sector through a portal coupling, illustrates the potential for the model to become asymptotically safe, have enhanced predictive power, and predict calculable values for all interactions.
Article
Physics, Multidisciplinary
Mahnaz Maleki, Hosein Mohammadzadeh, Morteza Nattagh Najafi, Zahra Ebadi
Summary: This study investigates the relationship between the maximum available temperature of a system and the deformation parameter using deformed boson statistics. The critical temperature is evaluated based on the density number of blackholes. The results show that for ordinary bosons, the maximum available temperature is approximately 0.3 times the Planck temperature, while for more deformed boson statistics, temperatures beyond the Planck temperature are available. Moreover, the study finds that the deformation statistics is consistent with the high temperature in the early universe.
Article
Physics, Particles & Fields
R. Kh Karimov, R. N. Izmailov, A. A. Potapov, K. K. Nandi
Summary: This study investigates the accretion of a new spinning naked singularity onto a Gal'tsov naked singularity, and examines the difference between naked singularities and Kerr black holes during the accretion process. The study reveals that the conversion efficiency of the naked singularity is independent of alpha, and the peaks of emissivity profiles for the naked singularity tend to shift towards the inner disk ISCO boundary and are significantly larger than those of Kerr black holes.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Mathematics
B. Dadoun, M. Fradelizi, O. Guedon, P-A Zitt
Summary: We study the first and second orders of the asymptotic expansion, as the dimension goes to infinity, of the moments of the Hilbert-Schmidt norm of a uniformly distributed matrix in the p-Schatten unit ball. We consider the case of matrices with real, complex or quaternionic entries, self-adjoint or not. When p > 3, this asymptotic expansion allows us to establish a generalized version of the variance conjecture for the family of p-Schatten unit balls of self-adjoint matrices.
JOURNAL OF FUNCTIONAL ANALYSIS
(2023)
News Item
Physics, Multidisciplinary
Alessandra Toncelli
Summary: Researchers have extended the range of laser emission beyond the limits of the gain medium by carefully choosing dielectric coatings.
Article
Physics, Particles & Fields
Guohua Liu, Yan Peng
Summary: This study proposes a universal relation for various black holes and horizonless compact stars, expressed by the mass to circumference ratio 4 pi M-in/C <= 1.
Review
Horticulture
Danilo Loconsole, Pietro Santamaria
Summary: UV light can influence the physiological responses of plants, with factors like wavelength, intensity, and exposure having a great impact on plant growth and quality. Plants regulate their response to UV light through photoreceptors, and low doses of UV may stimulate biomass accumulation and synthesis of healthy compounds.
Article
Astronomy & Astrophysics
C. J. Nelson, F. Auchere, R. Cuadrado, K. Barczynski, E. Buchlin, L. Harra, D. M. Long, S. Parenti, H. Peter, U. Schuehle, C. Schwanitz, P. Smith, L. Teriaca, C. Verbeeck, A. N. Zhukov, D. Berghmans
Summary: In this study, the transition region response of small-scale extreme-ultraviolet brightenings was investigated, revealing potential diversity in their physical mechanisms. Further research is needed to assess the importance of these brightenings for larger questions in the field, such as coronal heating.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Fengxiang Chen, Lisha Zhai, Huiyu Yang, Shichao Zhao, Zonglei Wang, Chong Gao, Jingyi Zhou, Xin Liu, Zhenwei Yu, Yong Qin, Weilin Xu
Summary: The study successfully enhanced the UV resistance and laundering durability of aramid fibers through a dual-layer ultrathin Al2O3-TiO2 coating. During testing with high temperature and intense UV light exposure, the fibers only experienced a decrease in tenacity of approximately 0.85%.
Article
Business
Dhruv Grewal, Abhijit Guha, Cinthia B. Satornino, Elisa B. Schweiger
Summary: Artificial intelligence has the potential to bring significant benefits in both B2B and B2C settings, but its dark side includes lack of trust and power asymmetries. This paper focuses on the dark side of AI and provides an organizing framework to understand both the bright and dark side of AI.
JOURNAL OF BUSINESS RESEARCH
(2021)
Article
Physics, Particles & Fields
Sharmanthie Fernando, P. A. Gonzalez, Yerko Vasquez
Summary: We studied neutral massless scalar field perturbations around an extreme dilaton black hole in 2 + 1 dimensions, and found that the wave equations of the massless scalar field are exactly solvable using Whittaker functions. Quasinormal modes are computed exactly, showing the existence of stable and unstable modes. Interestingly, the quasinormal modes are independent of the black hole's parameters, with the fundamental mode always unstable and depending solely on the parameters of the test field. Additionally, quasinormal frequencies were determined using the improved asymptotic iteration method, showing good agreement with analytical results.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Mathematics
David Alonso-Gutierrez, Joscha Prochno, Christoph Thaele
Summary: This work explores the connection between the KLS conjecture and the deviations of random vectors, as well as the projections in a ball. The study shows that the rate function undergoes a phase transition under different conditions.
JOURNAL OF FUNCTIONAL ANALYSIS
(2021)
Article
Hematology
J. Chin-Hon, L. Davenport, J. Huang, M. Akerman, A. Hindenburg
Summary: This study aimed to evaluate the safety and efficacy of direct oral anticoagulants (DOACs) in underweight and obese patients. The results showed that apixaban had lower rates of venous thromboembolism (VTE) and bleeding compared to warfarin. DOAC therapy may be a safe and effective option for patients with extreme body weights requiring anticoagulation.
THROMBOSIS RESEARCH
(2023)
Article
Multidisciplinary Sciences
Raul R. Cordero, Sarah Feron, Alessandro Damiani, Alberto Redondas, Jorge Carrasco, Edgardo Sepulveda, Jose Jorquera, Francisco Fernandoy, Pedro Llanillo, Penny M. Rowe, Gunther Seckmeyer
Summary: Thanks to the Montreal Protocol, ozone-depleting substances are decreasing and the Antarctic ozone layer is recovering. However, the ozone hole in Antarctica continues to occur each year, with the severity influenced by meteorological conditions. Recent measurements have revealed record high levels of UV radiation in the Antarctic region, despite the observed ozone recovery in early spring. It is found that the conditions favorable for extreme surface UV events persist in late spring, leading to the persistence of these events over the past two decades.
SCIENTIFIC REPORTS
(2022)