Related references
Note: Only part of the references are listed.
Review
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Nick van Remortel et al.
Summary: In this paper, the possible methods for detecting the gravitational wave background are reviewed, and the data analysis techniques are discussed in detail, focusing on Earth-based interferometric gravitational-wave detectors. In addition, various validation techniques aimed at reinforcing the claim of background detection are also discussed. The implications of current upper limits on the stochastic background of gravitational waves for astrophysics and cosmology are listed as well.
PROGRESS IN PARTICLE AND NUCLEAR PHYSICS
(2023)
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Shin'ichi Nojiri et al.
Summary: In this study, the holographic cut-off in the formalism of generalized holographic dark energy (HDE) is generalized to depend on the particle horizon, future horizon, and scale factor of the universe. It is shown that the Barrow entropic dark energy (DE) model is equivalent to the generalized HDE, where the holographic cut-off is determined by the first-order derivative of the particle horizon or future horizon. The equivalence is extended to consider the variation of the Barrow entropy exponent with the cosmological expansion.
Review
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A. Addazi et al.
Summary: The exploration of the universe has entered a new era with the multi-messenger paradigm, providing us with more information about the universe and opening up the possibility of searching for quantum gravity phenomena.
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Summary: Using observations of the central black hole and stars, we extract constraints on Barrow entropy, finding an upper bound less strong than the Big Bang Nucleosynthesis but significantly stronger than late-time cosmological constraints.
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H. Abedi et al.
Summary: This study investigates the effects of a large-scale background hypermagnetic field on the electroweak phase transition. A model is proposed where the effective weak angle varies during the phase transition. It is shown that in certain regions of the parameter space, the phase transition can occur in two steps and be first-order. The gravitational wave energy spectrum generated during the first-order part of the phase transition is calculated and it is found that these signals can be detected by the Ultimate-DECIGO interferometer for strong enough background hypermagnetic fields.
JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS
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Shin'ichi Nojiri et al.
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
Sofia Di Gennaro et al.
Summary: This paper discusses the possibility of fractal correction in the entropy associated with a horizon due to quantum gravitational effects. It also explores the implications of a running Barrow entropy index on the dynamical effective dark energy.
Article
Physics, Particles & Fields
Sofia Di Gennaro et al.
Summary: This study explores the possibility of a modification to the area law of horizon entropy and derives the corresponding modified gravity theory. It is found that, in the stationary case, the modified theory differs from general relativity only by a rescaled cosmological constant. However, the modified theory is not applicable in the absence of a horizon and the case of multiple horizons is more complicated. Furthermore, the importance of correctly identifying the thermodynamic mass in a theory with modified thermodynamics is emphasized.
EUROPEAN PHYSICAL JOURNAL C
(2022)
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Astronomy & Astrophysics
G. G. Luciano
Summary: We study the cosmological evolution of nonflat Friedmann-Robertson-Walker Universe with pressureless dark matter and Barrow holographic dark energy. We analyze the behavior of different model parameters and compare the observational consistency of interacting and noninteracting models. Our results show that the interacting model is favored by recent experimental constraints. The thermal stability of the model is also discussed.
Article
Physics, Particles & Fields
Giuseppe Gaetano Luciano et al.
Summary: We investigated the generation of baryon asymmetry caused by the modifications brought about in the Friedman equations due to Barrow entropy. By applying the gravity-thermodynamics conjecture, we obtained additional terms in the Friedmann equations that altered the evolution of the Hubble function during the radiation-dominated epoch. Even with the standard coupling between the Ricci scalar and baryon current, these terms can lead to a non-zero baryon asymmetry. In order to align with observations, we determined that the Barrow exponent should fall within the range of 0.005 to 0.008, indicating a slight deviation from the standard Bekenstein-Hawking entropy. The upper bound is more restrictive compared to other observational constraints, but the significant finding is the non-zero lower bound we obtained in this analysis.
EUROPEAN PHYSICAL JOURNAL C
(2022)
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Astronomy & Astrophysics
Alberto Roper Pol et al.
Summary: The NANOGrav, Parkes, European, and International Pulsar Timing Array (PTA) Collaborations have reported evidence for a common-spectrum process that can potentially correspond to a stochastic gravitational wave background (SGWB) in the 1-100 nHz frequency range. They performed magnetohydrodynamic (MHD) simulations to study the dynamical evolution of the magnetic field and compute the resulting SGWB. By comparing the SGWB signal with the PTA data, they constrained the temperature scale, amplitude, and characteristic scale of the initial magnetic field, and showed that the turbulent decay of this magnetic field can alleviate the Hubble tension.
Article
Physics, Particles & Fields
Mahnaz Asghari et al.
Summary: This paper investigates the modified gravitational field equations and modified Friedmann equations based on Barrow entropy. By analyzing different datasets, it is found that the tensions between the Hubble constant and CMB results are slightly reduced in Barrow cosmology with phantom dark energy, and there is a slight improvement in the sigma(8) tension in Barrow cosmology with quintessential dark energy compared to the standard model of cosmology.
EUROPEAN PHYSICAL JOURNAL C
(2022)
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Astronomy & Astrophysics
Shin'ichi Nojiri et al.
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.
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Astronomy & Astrophysics
Chia-Feng Chang
Summary: Early dark energy plays a significant role in alleviating Hubble tension and leaves its imprint in the primordial stochastic gravitational wave background originating from a cosmic string network. This signal can be detected by future planned gravitational wave experiments and is distinguishable from other astrophysical and cosmological signals in the gravitational wave frequency spectrum. Moreover, the cosmic string gravitational wave spectrum has the potential to probe other new physics generated after the post-big bang nucleosynthesis, expanding the search region for gravitational wave cosmic archaeology.
Article
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Umesh Kumar Sharma et al.
Summary: The study introduces a new dark energy model based on Barrow entropy and the holographic principle, using a time scale as an IR cut-off. By analyzing conformal time and the universe's age as infrared cut-offs, the cosmological significance of the suggested DE models is explored. The proposed models exhibit adequate nature in terms of equation of state, deceleration, and density parameters, potentially explaining late-time acceleration.
INTERNATIONAL JOURNAL OF MODERN PHYSICS D
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Abdulla Al Mamon et al.
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EUROPEAN PHYSICAL JOURNAL PLUS
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John D. Barrow et al.
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ASTROPHYSICAL JOURNAL LETTERS
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Ahmad Sheykhi
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