Article
Astronomy & Astrophysics
Everton M. C. Abreu, Jorge Ananias Neto
Summary: One of the challenges in today's theoretical physics is to understand the connection between geometrical objects like area and thermostatistical objects like entropy. This paper examines the Schwarzschild black hole using non-Gaussian entropies and finds that the Bekenstein bound conjecture seems to fail.
Article
Astronomy & Astrophysics
Minwoo Suh
Summary: This paper explains the microscopic counting of black hole entropy using the topologically twisted index, and demonstrates that the on-shell action is equal to the Bekenstein-Hawking entropy of supersymmetric black holes in AdS(6).
Article
Astronomy & Astrophysics
A. Khodam-Mohammadi, M. Monshizadeh
Summary: This study investigates the modifications to the FLRW cosmology by considering a general entropy for the cosmological apparent horizon. The research explores the impact of correcting the entropy on the energy-momentum tensor of the cosmic fluid by using a correction function. The study demonstrates that the entropic area law can still be considered a general entropy.
Article
Astronomy & Astrophysics
Francesco Bajardi, Francesco Bascone, Salvatore Capozziello
Summary: This paper discusses the potential issues with the entropy argument in gravity theories and provides counter-examples by considering different theories. The results show that inconsistencies exist even when curvature extensions and other theories are considered.
Article
Physics, Multidisciplinary
Adam G. Frim, Michael R. DeWeese
Summary: Stochastic thermodynamics has revolutionized our understanding of heat engines operating in finite time. In this study, we explore the full space of thermodynamic cycles with continuously varying bath temperature using thermodynamic geometry. We derive a universal geometric bound on the efficiency of any irreversible thermodynamic cycle and construct efficient heat engines operating in finite time that nearly saturate this bound. These optimal cycles perform more efficiently than other thermodynamic cycles and provide new design principles for future heat engines.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Zongping Gong, Lorenzo Piroli, J. Ignacio Cirac
Summary: In modern quantum chaos theory, a fundamental result is the upper bound on the growth of out-of-time-order correlators, which is related to the operator-space entanglement entropy of the evolution operator. For one-dimensional quantum cellular automata (QCA), there exists a lower bound on quantum chaos quantified by such entanglement entropy, equal to twice the index of the QCA. This rigorous bound rules out the possibility of any sublinear entanglement growth behavior and shows that many-body localization is forbidden for unitary evolutions displaying nonzero index.
PHYSICAL REVIEW LETTERS
(2021)
Article
Astronomy & Astrophysics
Ngo Phuc Duc Loc
Summary: If the Bekenstein-Hawking entropy of the Hubble horizon is interpreted as thermodynamic entropy, the entanglement entropy of the superhorizon modes of curvature perturbation entangled with the subhorizon modes will exceed the Bekenstein-Hawking bound at some point, which is called the unitary paradox of cosmological perturbations. The occurrence of the paradox during the inflationary era at a critical time or during the dark energy era at another critical time depends on whether a fine-tuned problem is accepted or not.
INTERNATIONAL JOURNAL OF MODERN PHYSICS D
(2023)
Article
Computer Science, Information Systems
Yangxue Li, Danilo Pelusi, Yong Deng, Kang Hao Cheong
Summary: Real-world information is uncertain and partially reliable, leading to the introduction of Z-numbers by Zadeh for modeling such information. Handling Z-number-based information has been challenging, similar to probability theory. In this work, a method for developing the concept of relative entropy of Z-numbers is proposed, leading to the construction of a novel Technique for Order of Preference by Similarity to Ideal Solution based on Z-numbers (ZTOPSIS) which directly calculates Z-numbers. A case study on supplier selection demonstrates the effectiveness of the proposed Z-TOPSIS method.
INFORMATION SCIENCES
(2021)
Article
Mathematics
Javier Bonilla, Daniel Velez, Javier Montero, J. Tinguaro Rodriguez
Summary: In the last two decades, information entropy measures have been widely used in fuzzy clustering to regularize solutions and avoid excessively overlapping clusters. Relative entropy measures, like Renyi divergence, have shown promise in this field by allowing for entropy-based regularization that interacts with cluster size variables. This study introduces a new regularization term based on Renyi relative entropy, which penalizes overlapping solutions in fuzzy clustering analysis, and develops two new fuzzy clustering methods using Renyi divergence-based regularization. Experimental results showed the feasibility and good performance of the proposed methods.
Article
Mathematics, Applied
Yuntao Zang
Summary: This passage describes how to use fake center-stable manifolds to calculate the entropy of an ergodic measure.
DISCRETE AND CONTINUOUS DYNAMICAL SYSTEMS
(2022)
Article
Physics, Multidisciplinary
Carl Willem Rischau, Yuke Li, Benoit Fauque, Hisashi Inoue, Minu Kim, Christopher Bell, Harold Y. Hwang, Aharon Kapitulnik, Kamran Behnia
Summary: The study demonstrates that in different types of superconductors, the Nernst signal corresponds to an entropy per vortex per layer of approximately k(B)ln2. The amplitude of the Nernst signal generated by ephemeral Cooper pairs above the critical temperature matches the theoretical expectations.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Iulia-Elena Hirica, Cristina-Liliana Pripoae, Gabriel-Teodor Pripoae, Vasile Preda
Summary: A large family of new alpha-weighted group entropy functionals is defined and associated Fisher-like metrics are considered. The main result of the paper establishes a link between such a metric and a canonical one. We recover a recent result for the case of non-weighted relative group entropies.
Article
Physics, Fluids & Plasmas
Domingos S. P. Salazar
Summary: Fluctuation theorems set fundamental limits on the statistics of entropy production, with the information quantification and upper bound determined by the maximal distribution. This bound is verified in various scenarios, including heat transfer and qubit swap engines, showcasing the versatility of the theory.
Article
Astronomy & Astrophysics
Orfeu Bertolami
Summary: Cosmological phase transitions are believed to have occurred in the early Universe, with evidence pointing to inflation shaping the Universe through the dynamics of a scalar field leading to a second order phase transition. This has significant implications for vacuum energy and considerations for subsequent second order phase transitions.
GENERAL RELATIVITY AND GRAVITATION
(2021)
Article
Astronomy & Astrophysics
Syed Masood A. S. Bukhari, Behnam Pourhassan, Houcine Aounallah, Li-Gang Wang
Summary: Thermodynamic Riemannian geometry provides great insights into the microscopic structure of black holes. We investigate whether the Ruppeiner flatness associated with higher dimensional Reissner-Nordstrom black holes still persists when modifications to black hole entropy are considered. We find surprising emergence of multiple phase transitions depending on the choice of corrections to entropy and charge, indicating the influence of quantum effects on the geometry of black holes.
CLASSICAL AND QUANTUM GRAVITY
(2023)
Article
Physics, Particles & Fields
Horacio Casini, Eduardo Teste, Gonzalo Torroba
JOURNAL OF HIGH ENERGY PHYSICS
(2017)
Article
Physics, Particles & Fields
David Blanco, Horacio Casini, Mauricio Leston, Felipe Rosso
JOURNAL OF HIGH ENERGY PHYSICS
(2018)
Article
Physics, Particles & Fields
Horacio Casini, Eduardo Teste, Gonzalo Torroba
JOURNAL OF HIGH ENERGY PHYSICS
(2018)
Article
Physics, Particles & Fields
Horacio Casini, Raimel Medina, Ignacio Salazar Landea, Gonzalo Torroba
JOURNAL OF HIGH ENERGY PHYSICS
(2018)
Article
Physics, Particles & Fields
Horacio Casini, Ignacio Salazar Landea, Gonzalo Torroba
JOURNAL OF HIGH ENERGY PHYSICS
(2019)
Article
Physics, Particles & Fields
Pablo Bueno, Horacio Casini, William Witczak-Krempa
JOURNAL OF HIGH ENERGY PHYSICS
(2019)
Article
Physics, Particles & Fields
Horacio Casini, Marina Huerta, Javier M. Magan, Diego Pontello
JOURNAL OF HIGH ENERGY PHYSICS
(2020)
Article
Physics, Particles & Fields
Pablo Bueno, Horacio Casini
JOURNAL OF HIGH ENERGY PHYSICS
(2020)
Article
Physics, Particles & Fields
Pablo Bueno, Horacio Casini
JOURNAL OF HIGH ENERGY PHYSICS
(2020)
Article
Physics, Multidisciplinary
V Benedetti, H. Casini
Article
Astronomy & Astrophysics
Horacio Casini, Marina Huerta, Javier M. Magan, Diego Pontello
Article
Astronomy & Astrophysics
Valentin Benedetti, Horacio Casini
Article
Astronomy & Astrophysics
Horacio Casini, Sergio Grillo, Diego Pontello
Article
Astronomy & Astrophysics
Raul E. Arias, Horacio Casini, Marina Huerta, Diego Pontello
Article
Astronomy & Astrophysics
Raul E. Arias, Horacio Casini, Marina Huerta, Diego Pontello