Article
Physics, Particles & Fields
Areef Waeming, Tanech Klangburam, Chakrit Pongkitivanichkul, Daris Samart
Summary: In this study, we investigate the Brans-Dicke model inspired by Kaluza-Klein theory and introduce additional scalar and gauge fields. The inclusion of barotropic matter in the compactification process leads to the determination of critical points that indicate the presence of dark matter, dark energy, and phantom dark energy.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Astronomy & Astrophysics
Murat Korunur
Summary: In this study, a correspondence between quintessence, tachyon, and dilaton scalar field definitions and the generalized ghost dark energy model was established in a five-dimensional framework. Numerical analysis of equation of state parameters, kinetic energy, and scalar potential terms was conducted.
CLASSICAL AND QUANTUM GRAVITY
(2021)
Article
Astronomy & Astrophysics
K. Dasu Naidu, Y. Aditya, R. L. Naidu, D. R. K. Reddy
Summary: The paper discusses the dynamical aspects of a Kaluza-Klein five-dimensional cosmological model with a massive scalar field and minimally interacting baryonic matter and dark energy. By obtaining a determinate solution, various parameters of the model are determined, and peculiar behaviors such as the transition of the equation of state parameter from quintessence to phantom are observed. The dynamics of cosmological parameters indicate accelerated expansion of the universe, consistent with current cosmological observations.
MODERN PHYSICS LETTERS A
(2021)
Article
Astronomy & Astrophysics
Alexander B. Balakin, Alexei S. Ilin
Summary: We propose a new self-consistent model that couples cosmic dark energy and dark matter using the rheological approach. This model represents the equations of state as integral operators of the Volterra type. We classify the exact solutions of the model based on the roots of the characteristic polynomial. The pressure, energy density, Hubble function, and acceleration parameter of dark energy and dark matter are expressed explicitly as functions of the dimensionless scale factor. We discuss two intriguing cosmological solutions that describe superexponential expansion and symmetric bounce, as well as new solutions corresponding to quasiperiodic behavior.
Article
Physics, Multidisciplinary
Marcus A. Khuri, Jordan F. Rainone
Summary: We present the first examples of formally asymptotically flat black hole solutions with horizons of general lens space topology L(p, q). These solutions are five-dimensional static or stationary spacetimes that are regular on and outside the event horizon, and supported by Kaluza-Klein matter fields. Additionally, we obtain new examples of regular gravitational instantons in higher dimensions.
PHYSICAL REVIEW LETTERS
(2023)
Article
Astronomy & Astrophysics
Giovanni Montani, Sebastiano Segreto
Summary: The reanalysis of the 5D Kaluza-Klein theory with the implementation of polymer representation in both classical and quantum levels provides valuable insights into the existence of a cut off scale and introduces a new solution in the context of semiclassical quantum mechanics. This revised formulation overcomes puzzling questions of the standard model and allows for the attribution of charge to mass ratio to particles predicted by the Standard Model. However, a problem with the charge to mass ratio still persists in the quantum field formulation.
Article
Astronomy & Astrophysics
Gargi Biswas, Kaushik Sarkar, B. Modak
Summary: The study presents wormhole as solutions to Euclidean field equations and Wheeler-DeWitt equation in (4 + 1)-dimensional Kaluza-Klein cosmology, with numerical solutions allowing wormhole configurations with standard potentials. The worm-hole solution triggers decay of potential and reduction of internal space, showing cosmic evolution away from the classical forbidden domain. Analytic and numerical solutions of the Wheeler-DeWitt equation also support Hawking-Page wormhole boundary conditions.
MODERN PHYSICS LETTERS A
(2021)
Article
Astronomy & Astrophysics
Lam Hui, Y. . T. Albert Law, Luca Santoni, Guanhao Sun, Giovanni Maria Tomaselli, Enrico Trincherini
Summary: Studies on black hole superradiance often focus on the growth of a cloud in isolation and the spin-down of the black hole. However, this paper considers the additional effect of matter and angular momentum accretion from the surrounding environment. The authors demonstrate that the black hole can evolve by drifting along the superradiance threshold, allowing for analytical or semi-analytical description of its parameter evolution. They also propose the concept of oversuperradiance, where accretion effectively feeds the superradiance cloud through the black hole. Two examples of accretion processes are provided: from a vortex in wave dark matter and from a baryonic disk. The paper also discusses level transition in a similar manner.
Article
Astronomy & Astrophysics
Casper J. G. Vedder, Enis Belgacem, Nora Elisa Chisari, Tomislav Prokopec
Summary: The mysterious origin of dark energy driving the accelerated expansion of the universe is explored in this study. The possibility of dark energy fluctuations resulting in spatial correlations is discussed. The effect of these fluctuations on measurements of type Ia supernovae, which are used to constrain the luminosity distance, is investigated. It is found that the luminosity distance is affected in several ways, including differences from the standard ACDM and the emergence of angular correlations in the luminosity distance.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Wei Cheng, Xuewen Liu, Ruiyu Zhou
Summary: This paper studies the cosmological inflation and dark matter within a Z3 complex scalar model and finds that the mixing angle, DM mass, and Higgs-like scalar mass are constrained in the low-energy scale. It also suggests that measuring the tensor-to-scalar ratio with higher precision can distinguish between the two forms of inflation in the high-energy scale.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Mar Bastero-Gil, Antonio Torres Manso
Summary: We present a supersymmetric extension of a unified model for inflation and Dark Matter, which is based on the incomplete decay of the inflaton field into right-handed neutrino pairs. By imposing a discrete interchange symmetry on the inflaton and right-handed neutrinos, stability of the inflaton field at the global minimum is ensured, while still allowing partial decay and reheating of the Universe. Compatibility with inflationary predictions, BBN bounds, and obtaining the right DM abundance typically requires large couplings to the neutrino sector.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Physics, Multidisciplinary
Mikhail Shaposhnikov, Andrey Shkerin, Inar Timiryasov, Sebastian Zell
Summary: This passage discusses a novel mechanism for producing singlet fermions in the early Universe through gravity-induced interactions. These fermions can act as dark matter particles and are applicable to a wide range of dark matter particle masses. The potential observational consequences of producing keV-scale dark matter in this way, particularly for right-handed neutrinos, are also explored. The authors suggest that determining the momentum distribution of primordial dark matter may shed light on gravity-induced fermionic interactions.
PHYSICAL REVIEW LETTERS
(2021)
Article
Astronomy & Astrophysics
Andre Maeder, Vesselin G. Gueorguiev
Summary: Maxwell equations and the equations of general relativity are scale invariant in empty space, but the presence of charge, current, or matter can break this property. In cosmology, the presence or absence of scale invariance depends on the density of the universe, with considerations about causal connection playing a significant role.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Oleg Lebedev
Summary: Stable scalars can be abundantly produced in the Early Universe even without coupling to other fields. The production and mass scale of these scalars during and after (high scale) inflation are studied, leading to strong constraints. Quantum gravity-induced Planck-suppressed operators significantly affect the abundance of dark matter relics, often resulting in overproduction unless the corresponding Wilson coefficients are very small. The uncontrollable nature of these effects without a quantum gravity theory questions the predictability of many non-thermal dark matter models and has potential implications for string theory constructions with abundant scalar fields.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Cao H. Nam
Summary: Based on the swampland program, this study suggests that if this program is true, the brane-world scenario with branon dark matter would be ruled out. The constraints of quantum gravity imply that the branons must be absorbed by the KK gauge bosons, which leads to a geometric unification of gravity and dark matter. The KK gauge boson dark matter provides a promising observation window to search for weakly interacting dark matter in the cosmic microwave background and primordial gravitational waves.
