Article
Physics, Particles & Fields
Yogendra Srivastava, Giorgio Immirzi, John Swain, Orlando Panella, Simone Pacetti
Summary: This article discusses a general class of axially symmetric metrics in general relativity that includes rotations, which are used to study the dynamics of rotationally supported galaxies. The exact vacuum solutions of the Einstein equations for this extended Weyl class of metrics lead to the following rigorous deductions: (i) The rotational velocity in general relativity always exceeds the Newtonian velocity due to Lenz's law. (ii) A non-zero intrinsic angular momentum for a galaxy requires the asymptotic constancy of the Weyl length parameter, similar to the Kerr metric. (iii) The asymptotic constancy of the parameter also implies a plateau in the rotational velocity. Unlike the Kerr metric, the extended Weyl metric can be extended within the galaxy, and it has been shown that Gauss and Ampere laws emerge along with Ludwig's extended gravito-electromagnetism (GEM) theory and non-linear rate equations for the velocity field. More accurate estimates for the Sun's escape velocity than those obtained from Newtonian theory have been presented.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Astronomy & Astrophysics
Adriana Bariego-Quintana, Felipe J. Llanes-Estrada, Oliver Manzanilla Carretero
Summary: The flattening rotation velocity v(r) -> constant discovered by Rubin and collaborators in the SPARC galaxy-rotation data is in line with Kepler's law in one less dimension. Elongated dark matter distributions, with their axis of prolateness perpendicular to the galactic plane, naturally reproduce this phenomenon. Detailed fits to the rotation data also support this theoretical understanding, showing that elongated distributions provide a better fit than purely spherical ones.
Article
Astronomy & Astrophysics
A. Alonso-Serrano, M. Liska
Summary: By heuristically deriving the Hawking temperature and Bekenstein entropy from the existence of a minimal resolvable area, we found quantum gravity corrections that are qualitatively consistent with results obtained by other methods. The size of the minimal area is constrained by semiclassical black hole physics, particularly by the entropy content of Hawking radiation. The derivation method is also applied to finding the Unruh temperature associated with causal diamonds and establishing a new relation between this temperature and the entropy of the causal diamond's horizon.
Article
Astronomy & Astrophysics
P. H. R. S. Moraes, G. Panotopoulos, I Lopes
Summary: This study investigates the properties of exotic stars made entirely of dark matter, considering intrinsic anisotropies that have been ignored so far. Semi-analytical solutions to the structure equations are obtained, showing that these solutions behave well within general relativity and can describe realistic astrophysical configurations. A direct comparison with isotropic counterparts with the same radius reveals that the latter are slightly more massive.
Article
Astronomy & Astrophysics
R. A. C. Correa, P. H. R. S. Moraes, A. de Souza Dutra, O. L. Dors, W. de Paulai, T. Frederico
Summary: This study utilizes a nonlinear scalar field theory coupled to gravity to model galactic dark matter, providing analytical solutions with position dependent self-interactions. The model effectively describes the rotation curves of dwarf and low surface brightness late-type galaxies.
Article
Astronomy & Astrophysics
Kamila Kowalska, Enrico Maria Sessolo
Summary: The study uses the framework of asymptotic safety above the Planck scale to constrain and predict new physics models, considering extensions of the Standard Model and the impact of dark matter. Different phenomenological predictions can be derived in various cases, further restricting the parameter space.
Article
Astronomy & Astrophysics
Torsten Bringmann, Paul Frederik Depta, Marco Hufnagel, Joern Kersten, Joshua T. Ruderman, Kai Schmidt-Hoberg
Summary: We propose a new mechanism for generating undetectable sterile neutrinos vs in the early Universe, through the conversion of ordinary neutrinos va in scattering processes vsva -> vsvs. This leads to an exponential growth in the abundance of vs after initial production by oscillations. We demonstrate that this production regime occurs naturally for self-interacting vs, offering significant opportunities for vs to account for all observed dark matter. Our findings provide strong motivation to enhance the sensitivity of X-ray line searches and improve constraints from structure formation.
Article
Physics, Particles & Fields
Federico Re
Summary: This research proposes a relativistic effect to explain dark matter and dark energy. Inhomogeneous matter generates gravitational distortions, significantly affecting the expansion of the universe and requiring corrections to the parameters of the standard cosmological model. Relativistic models offer various solutions, including those that fully explain dark energy and dark matter.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Astronomy & Astrophysics
Piyabut Burikham, Tiberiu Harko, Kulapant Pimsamarn, Shahab Shahidi
Summary: We investigate if the behavior of test particles outside galaxies, which is usually attributed to dark matter, can be explained by the dynamical evolution of particles in a Weyl type geometry. We construct a conformally invariant gravitational action in Weyl geometry and derive the field equations in the absence of matter. A specific static, spherically symmetric model is considered and the galactic rotation curves are analyzed. We show that Weyl geometric models can be a viable alternative to the dark matter paradigm.
Article
Physics, Multidisciplinary
Johannes Herms, Sudip Jana, P. K. Vishnu, Shaikh Saad
Summary: The paper presents a minimal UV-complete model for kinematically forbidden dark matter, leading to sub-GeV thermal relic. It suggests that the two-Higgs-doublet model can provide a light mediator which allows the dark matter to annihilate into standard model leptons, avoiding indirect detection constraints. With couplings to muons required to reproduce the dark matter relic abundance, this framework favors a resolution to the (g - 2)($\mu$) anomaly naturally.
PHYSICAL REVIEW LETTERS
(2022)
Article
Astronomy & Astrophysics
Tobias Mistele
Summary: A new method is proposed to constrain alternative models for dark matter with observations, focusing on hybrid models that combine CDM and MOND phenomena. These models feature a mode directly coupled to matter with a nonrelativistic sound speed, allowing even non-relativistic objects like stars to emit Cherenkov radiation and lose energy. This diverges from most modified gravity models which have a relativistic sound speed.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Hooman Davoudiasl, Peter B. Denton, David A. McGady
Summary: The conventional lore excludes fermionic dark matter with mass lighter than a few hundred electronvolts based on the Pauli exclusion principle. A new method is proposed in this paper which involves numerous quasi-degenerate species of fermions without couplings to the standard model to evade this bound. Gravitational interactions impose constraints from measurements at the LHC, cosmic rays, supernovae, and black hole spins and lifetimes, with a particular limit on the number of distinct species of particles being less than or around 10^62.
Article
Astronomy & Astrophysics
Mark P. Hertzberg, Jacob A. Litterer, Neil Shah
Summary: Novel models of dark matter have been developed to explain galactic scales behavior, particularly the observed Baryonic Tully-Fisher Relation. Superfluid dark matter models are a beautiful example of these, exhibiting a 3/2 kinetic scaling in the low energy effective theory on galactic scales. Examining the causality and locality properties of these models reveal high energy perturbations that violate global hyperbolicity and exhibit forms of non-locality.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Pengfei Li, Stacy S. McGaugh, Federico Lelli, Yong Tian, James M. Schombert, Chung-Ming Ko
Summary: This paper investigates the radial acceleration relation (RAR) in a cold dark matter (CDM) framework using a semiempirical model. The study finds that the CDM model with abundance matching alone cannot explain the observed RAR, and the overall compression of dark matter halos leads to systematic deviations from the observed relation.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Alvaro de la Cruz Dombriz, Francisco Jose Maldonado Torralba, David F. Mota
Summary: The stable pseudo-scalar degree of freedom in the quadratic Poincare Gauge theory of gravity is identified as a suitable candidate for dark matter. The study determines the parameter space in the theory that can explain all predicted cold dark matter phenomena and constrains these parameters with astrophysical observations.
Article
Astronomy & Astrophysics
Pasquale Bosso, Octavio Obregon
CLASSICAL AND QUANTUM GRAVITY
(2020)
Editorial Material
Physics, Multidisciplinary
Pasquale Bosso, Saurya Das, Vasil Todorinov
Article
Physics, Multidisciplinary
Pasquale Bosso, Saurya Das, Vasil Todorinov
Summary: This paper investigates Quantum Electrodynamics under the condition of minimum length and discusses its implications for high energy physics experiments. By providing an improved window, the research aims to test Quantum Gravity effects in laboratory settings.
Article
Education, Scientific Disciplines
Pasquale Bosso, Anthony Huber, Vasil Todorinov
Summary: This study introduces and tests a simple model for a fair 'three-sided coin', and statistically analyzes data collected from actual realizations to support the proposed model. It also serves as a demonstration of applying the scientific method in problem-solving, providing educational value for undergraduate students.
EUROPEAN JOURNAL OF PHYSICS
(2021)
Article
Astronomy & Astrophysics
Pasquale Bosso
Summary: Quantum mechanical models with a minimal length often involve modifying the relationship between position and momentum. While this is a minor complication in momentum space, the representation in (quasi-)position space poses many issues and leads to misunderstandings. This work reviews and clarifies some aspects of minimal length models, focusing on the representation of the position operator.
CLASSICAL AND QUANTUM GRAVITY
(2021)
Article
Astronomy & Astrophysics
Pasquale Bosso, Octavio Obregon, Saeed Rastgoo, Wilfredo Yupanqui
Summary: This study investigates the classical Hamiltonian of the interior of the Schwarzschild black hole in the Ashtekar-Barbero connection formalism and deforms the classical canonical algebra inspired by generalized uncertainty principle models. The deformation leads to the resolution of the singularity of the black hole and a minimum nonzero radius for the infalling two-spheres, with negative deformation parameters chosen.
CLASSICAL AND QUANTUM GRAVITY
(2021)
Article
Physics, Particles & Fields
Pasquale Bosso, Giuseppe Gaetano Luciano
Summary: This work investigates the impact of a polynomial generalized uncertainty principle on the harmonic oscillator, deriving the exact form of the generalized Heisenberg algebra and showing that the energy spectrum and eigenfunctions are non-trivially affected. Additionally, a quantum field theoretic toy model based on the generalized uncertainty principle is constructed using a new set of ladder operators that exactly factorize the Hamiltonian.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Review
Physics, Nuclear
A. Addazi, J. Alvarez-Muniz, R. Alves Batista, G. Amelino-Camelia, V Antonelli, M. Arzano, M. Asorey, J-L Atteia, S. Bahamonde, F. Bajardi, A. Ballesteros, B. Baret, D. M. Barreiros, S. Basilakos, D. Benisty, O. Birnholtz, J. J. Blanco-Pillado, D. Blas, J. Bolmont, D. Boncioli, P. Bosso, G. Calcagni, S. Capozziello, J. M. Carmona, S. Cerci, M. Chernyakova, S. Clesse, J. A. B. Coelho, S. M. Colak, J. L. Cortes, S. Das, V D'Esposito, M. Demirci, M. G. Di Luca, A. di Matteo, D. Dimitrijevic, G. Djordjevic, D. Dominis Prester, A. Eichhorn, J. Ellis, C. Escamilla-Rivera, G. Fabiano, S. A. Franchino-Vinas, A. M. Frassino, D. Frattulillo, S. Funk, A. Fuster, J. Gamboa, A. Gent, L. A. Gergely, M. Giammarchi, K. Giesel, J-F Glicenstein, J. Gracia-Bondia, R. Gracia-Ruiz, G. Gubitosi, E. Guendelman, I Gutierrez-Sagredo, L. Haegel, S. Heefer, A. Held, F. J. Herranz, T. Hinderer, J. I. Illana, A. Ioannisian, P. Jetzer, F. R. Joaquim, K-H Kampert, A. Karasu Uysal, T. Katori, N. Kazarian, D. Kerszberg, J. Kowalski-Glikman, S. Kuroyanagi, C. Lammerzahl, J. Levi Said, S. Liberati, E. Lim, I. P. Lobo, M. Lopez-Moya, G. G. Luciano, M. Manganaro, A. Marciano, P. Martin-Moruno, Manel Martinez, Mario Martinez, H. Martinez-Huerta, P. Martinez-Mirave, M. Masip, D. Mattingly, N. Mavromatos, A. Mazumdar, F. Mendez, F. Mercati, S. Micanovic, J. Mielczarek, A. L. Miller, M. Milosevic, D. Minic, L. Miramonti, V. A. Mitsou, P. Moniz, S. Mukherjee, G. Nardini, S. Navas, M. Niechciol, A. B. Nielsen, N. A. Obers, F. Oikonomou, D. Oriti, C. F. Paganini, S. Palomares-Ruiz, R. Pasechnik, V Pasic, C. Perez de los Heros, C. Pfeifer, M. Pieroni, T. Piran, A. Platania, S. Rastgoo, J. J. Relancio, M. A. Reyes, A. Ricciardone, M. Risse, M. D. Rodriguez Frias, G. Rosati, D. Rubiera-Garcia, H. Sahlmann, M. Sakellariadou, F. Salamida, E. N. Saridakis, P. Satunin, M. Schiffer, F. Schussler, G. Sigl, J. Sitarek, J. Sola Peracaula, C. F. Sopuerta, T. P. Sotiriou, M. Spurio, D. Staicova, N. Stergioulas, S. Stoica, J. Striskovic, T. Stuttard, D. Sunar Cerci, Y. Tavakoli, C. A. Ternes, T. Terzic, T. Thiemann, P. Tinyakov, M. D. C. Torri, M. Tortola, C. Trimarelli, T. Trzesniewski, A. Tureanu, F. R. Urban, E. C. Vagenas, D. Vernieri, V. Vitagliano, J-C Wallet, J. D. Zornoza
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.
PROGRESS IN PARTICLE AND NUCLEAR PHYSICS
(2022)
Article
Astronomy & Astrophysics
Pasquale Bosso
Summary: Several approaches to quantum gravity suggest the existence of a minimal measurable length at high energies, contradicting the Heisenberg Uncertainty Principle. To address this issue, the Generalized Uncertainty Principle is introduced in phenomenological approaches to quantum gravity, affecting several features of quantum mechanics, such as the exclusion of position eigenstates in models with a minimal length.
Article
Astronomy & Astrophysics
Pasquale Bosso, Juan Manuel Lopez Vega
Summary: The generalized uncertainty principle (GUP) introduces the concept of a minimal length by modifying the uncertainty relation between momentum and position, as predicted by quantum gravity theories. By incorporating GUP, Planck's distribution can be derived and used to explain the thermodynamics of black body radiation, leading to modifications of Wien's law and the Stefan-Boltzmann law at the Planck scale.
CLASSICAL AND QUANTUM GRAVITY
(2022)
Article
Astronomy & Astrophysics
Pasquale Bosso, Luciano Petruzziello, Fabian Wagner
Summary: This paper clarifies a foundational issue in the phenomenological approach to quantum gravity regarding the generalization of Heisenberg's uncertainty principle. The confusion between perturbative and non-perturbative methods in recent works has resulted in a blurred distinction between changes in the deformed algebra and changes in the representation of operators. This reasoning implies that the existence of a minimal length is representation-dependent and therefore unphysical.
Article
Astronomy & Astrophysics
Pasquale Bosso
Summary: Phenomenological studies of quantum gravity propose modifying the commutator between position and momentum in quantum mechanics to introduce minimal uncertainty in position. This study demonstrates the influence of space and time transformations on shaping quantities like momentum, energy, and their relationships with transformation generators. This influence determines the time evolution of quantum systems, with the Schrodinger equation identical to the ordinary case in the example of Galilean transformations.
CLASSICAL AND QUANTUM GRAVITY
(2023)
Article
Physics, Multidisciplinary
Pasquale Bosso, Luciano Petruzziello, Fabian Wagner, Fabrizio Illuminati
Summary: Theories of quantum gravity suggest a minimum scale of length. The authors demonstrate that this minimum length has a significant impact on dynamical observables, such as the spin operator becoming dependent on momentum, and discuss the implications of the mixing between space-time and internal degrees of freedom.
COMMUNICATIONS PHYSICS
(2023)
Article
Astronomy & Astrophysics
Pasquale Bosso, Giuseppe Gaetano Luciano, Luciano Petruzziello, Fabian Wagner
Summary: This study examines various arguments in quantum gravity, both model-dependent and model-independent, which suggest a modification of Heisenberg's uncertainty principle near the Planck scale. This modification is attributed to the existence of a minimal length. The study critically reviews the conceptual shortcomings of the underlying framework and recent developments in the field. It addresses issues such as relativity, field theory generalizations, the classical limit, and the application to composite systems. Additionally, the study comments on the use of heuristic arguments and presents a comprehensive list of constraints on the model parameter ss, considering their derivation rigor and potential problems with composites.
CLASSICAL AND QUANTUM GRAVITY
(2023)
