Article
Physics, Particles & Fields
Mehdi Rezaei, Joan Sola Peracaula
Summary: In this study, different types of dynamical dark energy models were compared using the cosmographic method. The Running Vacuum models showed comparable ability to fit the overall cosmological data to the standard cosmological model and alleviate the tension between sigma(8) and H-0. The Holographic dark energy models were also examined under the assumptions of fixed and evolving holographic length scale, with the latter showing better performance.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Astronomy & Astrophysics
Abdul Jawad, Manzar Abbas, Shamaila Rani
Summary: This paper investigates holographic inflation within the frameworks of f(T) gravity and DGP braneworld model, exploring various inflationary parameters using a modified infrared cutoff. The behavior of these parameters is presented graphically and shown to be consistent with Planck 2018 data.
INTERNATIONAL JOURNAL OF MODERN PHYSICS D
(2021)
Article
Astronomy & Astrophysics
Chenchen Zhao, Yannan Qi, Weiqiang Yang, Bo Jiang, Wenyu Feng, Yabo Wu
Summary: This paper further studies the cosmological evolution and geometry diagnosis of the Barrow holographic dark energy in the DGP braneworld by exploring the interaction between dark energy and dark matter. The results show that the model conforms to the current cosmic evolution rule and provides an explanation for cosmic acceleration. Additionally, geometric diagnosis methods such as the Statefinder hierarchy and Om(z) can distinguish this model from the CDM model and reveal the coupling parameters that significantly affect the dark energy model.
MODERN PHYSICS LETTERS A
(2022)
Article
Astronomy & Astrophysics
Arindam Saha, Anirban Chanda, Sagar Dey, Souvik Ghose, B. C. Paul
Summary: We investigate both the interacting and non-interacting Renyi Holographic Dark Energy (RHDE) models in the Dvali-Gabadadze-Porrati (DGP) braneworld framework. The cosmological parameters and their evolutions are probed to obtain realistic cosmological models. We note that both models can accommodate the present accelerating phase of expansion with the observed dark energy density. Classical stability of the cosmological model and the Om-diagnostic are also studied to test the suitability of the cosmological models obtained in the presence of RHDE in the DGP braneworld.
MODERN PHYSICS LETTERS A
(2023)
Article
Astronomy & Astrophysics
Abdul Jawad, Sadaf Maqsood, Shamaila Rani
Summary: The study investigates the influence of time dependent vacuum energy on the cosmic history and finds that the system has stable critical points in most cases, exhibiting attractive behavior of the universe.
PHYSICS OF THE DARK UNIVERSE
(2021)
Article
Astronomy & Astrophysics
Abolhassan Mohammadi
Summary: This passage discusses the role of holographic dark energy in warm inflation scenario and explains how the model's predictions are combined with observational data to determine free constants values, thus estimating the energy density of inflation. Ultimately, it is considered that the model is a suitable candidate for warm inflation.
Article
Astronomy & Astrophysics
Shin'ichi Nojiri, Sergei D. Odintsov, Tanmoy Paul
Summary: The study introduces a new four-parameter entropy function that unifies the early inflation and late dark energy era of the universe. It reveals that the parameters values for early inflation and late dark energy are consistent in this unified scenario. Additionally, the entropic cosmology from the proposed entropy function is equivalent to holographic cosmology.
Article
Astronomy & Astrophysics
Suman Kumar Kundu, Arnab Pradhan, Carl Rosenzweig
Summary: The cosmological constant problem, which explores the mismatch between theoretical predictions and actual measurements of the vacuum energy's gravity, remains a significant challenge in physics. By using Rydberg atoms, researchers have been able to extend the study of the gravitational effects of vacuum energy to microscopic distances, providing valuable insights into the problem.
Article
Astronomy & Astrophysics
Zahra Bouabdallaoui, Ahmed Errahmani, Mariam Bouhmadi-Lopez, Taoufik Ouali
Summary: In this paper, warm inflation is considered in the context of holographic cosmology. The weak and strong dissipative regimes are analyzed within the slow-roll approximation and intermediate inflation. By considering several dissipative and physically relevant functions, the author constrains the model using the latest Planck data, and concludes that three of the models analyzed are consistent with the observations.
Article
Astronomy & Astrophysics
Shin'ichi Nojiri, Sergei D. Odintsov, Valerio Faraoni
Summary: We propose a new entropy construct that generalizes existing entropies and converges to known entropy in a specific limit. Applying this construct to Schwarzschild black hole and cosmology models, it is shown that it has the potential to describe inflation and/or holographic dark energy.
Article
Astronomy & Astrophysics
Josef Leutgeb, Anton Rebhan, Michael Stadlbauer
Summary: In this study, we evaluate the leading-order hadronic vacuum polarization contribution to the anomalous magnetic moment of the muon with two light flavors in minimal hard-wall and soft-wall holographic QCD models. We compare the results with those obtained from dispersive and lattice approaches. This comparison provides useful information on the holographic models, which have been used to evaluate hadronic light-by-light contributions.
Article
Physics, Particles & Fields
Gabriela Barenboim, Christopher T. Hill
Summary: The study presents an effective field theory (EFT) model for describing matter field interactions with Schwarzschild mini-black-holes (SBH's) and considers fermion interactions with SBH's. It suggests that the information field can be promoted to a dynamical field, leading to a tachyonic instability and breaking the vacuum to SU(N)xU(1)/SO(N). The model implies the existence of many scalar fields bound nonperturbatively by gravity.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Physics, Particles & Fields
C. P. Singh, Joan Sola Peracaula
Summary: This paper investigates Friedmann cosmology within the framework of Brans-Dicke theory, considering time-varying vacuum energy density. By analyzing two different cases (Lambda(H1) and Lambda(H2)), the study provides analytical solutions for various cosmological functions and examines the viability of the models through joint observational analyses. The Brans-Dicke analog of the Lambda-cosmology model (Lambda(H1)) is found to perform comparably to the standard CDM model, while Lambda(H2) is less favored.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Physics, Particles & Fields
Cristian Moreno-Pulido, Joan Sola Peracaula
Summary: Recent studies suggest that the speeding up of the universe is caused by the running vacuum in FLRW spacetime. The appropriate renormalization of the energy-momentum tensor shows that the vacuum energy density is a smooth function of the Hubble rate. This study focuses on calculating the equation of state of the running vacuum for the entire cosmic history within a quantum field theory framework. In the early universe, the vacuum EoS is close to -1, while during the FLRW era, it adopts different EoS and eventually approaches -1.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Review
Multidisciplinary Sciences
Francisco J. Garcia-Vidal, Cristiano Ciuti, Thomas W. Ebbesen
Summary: In the past decade, there has been a surge of interest in using hybrid light-matter states to control the properties of matter and chemical reactivity. Experimental and theoretical studies have shown that these hybrid states can enhance properties like transport, magnetism, and superconductivity, as well as modify (bio)chemical reactivity. This multidisciplinary field has great potential for further exploration.
Article
Physics, Particles & Fields
Xing Wu
JOURNAL OF HIGH ENERGY PHYSICS
(2015)
Article
Astronomy & Astrophysics
Don N. Page, Xing Wu
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2012)
Article
Astronomy & Astrophysics
Xing Wu
Article
Astronomy & Astrophysics
Xing Wu, Zong-Hong Zhu
Article
Physics, Particles & Fields
Xing Wu
JOURNAL OF HIGH ENERGY PHYSICS
(2019)