Article
Physics, Particles & Fields
H. Adami, M. M. Sheikh-Jabbari, V. Taghiloo, H. Yavartanoo, C. Zwikel
Summary: The study focuses on surface charges on a generic null boundary in three dimensional topological massive gravity, constructing the solution phase space with four independent functions. One function corresponds to the chiral propagating graviton mode, while the other three correspond to distinct surface charges of the theory. The null boundary symmetry algebra is identified as Heisenberg circle plus Virasoro algebra, with a central charge related to the gravitational Chern-Simons term of TMG.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Alberto Escalante, Jorge Hernandez Aguilar
Summary: A detailed analysis of higher-order topologically massive gravity was conducted, reporting the full structure of constraints, counting of physical degrees of freedom, and the Dirac algebra among the constraints. The analysis presented a new structure within the constraints and compared the results with those in the literature developed under a standard Ostrogradski framework.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Physics, Particles & Fields
Vahid Taghiloo
Summary: We study the three dimensional topologically massive gravity (TMG) with a generic codimension one null boundary. The existence of the boundary is accounted for by introducing degrees of freedom that reside only at the boundary, known as boundary degrees of freedom, in the Hilbert space of the theory. The solution phase space of this theory involves both bulk massive chiral gravitons of TMG and boundary modes labeled by surface charges associated with large diffeomorphisms. We demonstrate that the boundary degrees of freedom obey a local thermodynamic description, known as null surface thermodynamics, which is described by a local version of the first law, a local Gibbs-Duhem equation, and local zeroth law. This null surface thermodynamics describes an open boundary system that is generically out of thermal equilibrium due to the expansion of the boundary and the passage of the bulk mode through the boundary.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Physics, Multidisciplinary
Nihat Sadik Deger, Marc Geiller, Jan Rosseel, Henning Samtleben
Summary: The minimal massive gravity model in three dimensions propagates a single massive spin-2 mode around an anti-de Sitter vacuum, allowing for vacua with positive central charges and a bulk graviton of positive energy. Surprisingly, all vacua complying with bulk and boundary unitarity appear to break supersymmetry spontaneously in the supersymmetric extension of the model.
PHYSICAL REVIEW LETTERS
(2022)
Article
Astronomy & Astrophysics
D. Dalmazi, A. L. R. dos Santos
Summary: This paper introduces new spin-4 self-dual and parity doublet models in D = 2 + 1. Despite involving higher order derivatives, they are ghost free. By finding gauge invariant field combinations, the canonical structure of spin-4 models is shown to follow a similar pattern as spin-2 models after field redefinitions.
Article
Astronomy & Astrophysics
Teresa Bautista, Aditya Bawane
Summary: This article investigates timelike Liouville theory with specific boundary conditions and derives the structure constants. The results show that these structure constants are not the analytic continuations of their spacelike counterparts.
Article
Astronomy & Astrophysics
Jisuke Kubo, Jeffrey Kuntz, Jonas Rezacek, Philipp Saake
Summary: We investigate the effects of gravitational degrees of freedom on inflationary parameters in a generic model of quadratic gravity coupled to a single scalar. Our findings show that quantum corrections from the massive spin-2 ghost contribute significantly to the effective inflationary potential, enabling the spontaneous breakdown of global scale invariance without the need for additional scalar fields. We compute inflationary parameters and compare them to well-known inflationary models, finding that they fit within the constraints set by the Planck and BICEP/Keck collaborations.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
M. Mousavi, K. Atazadeh
Summary: The study examines future cosmological singularities in the context of massive gravity and minimal massive bigravity theory. It identifies sudden and big brake singularities in different cosmological models, noting that the sudden singularity can be eliminated when model parameters approach zero.
PHYSICS OF THE DARK UNIVERSE
(2022)
Article
Astronomy & Astrophysics
Ekapob Kulchoakrungsun, Ananya Mukherjee, Nishant Agarwal, Anthony R. Pullen
Summary: We study the background dynamics and growth of matter perturbations in massive gravity. We find stable perturbations under certain conditions in a specific choice of potential where the scalar field behaves like pressureless matter. We observe scale-independent growth in the study of matter perturbation growth.
Article
Physics, Multidisciplinary
Daniel Flores-Alfonso, Cesar S. Lopez-Monsalvo, Marco Maceda
Summary: The study demonstrates that the three-dimensional Thurston geometries are vacuum solutions to the 3D new massive gravity equations, and also analyzes their Lorentzian counterparts.
PHYSICAL REVIEW LETTERS
(2021)
Article
Astronomy & Astrophysics
Daniel Flores-Alfonso, Cesar S. Lopez-Monsalvo, Marco Maceda
Summary: The article discusses the relationship between three-dimensional e-contact manifolds and electromagnetism equations, showing that manifolds satisfying specific conditions are solutions to certain gravity actions. An example of a contact manifold with an associated metric tensor is analyzed to demonstrate the conclusions presented.
Article
Physics, Particles & Fields
B. Afshar, N. Riazi, H. Moradpour
Summary: This study shows that using Lagranginas with poles in the framework of dRGT massive gravity can provide a plausible explanation for cosmic inflation and is consistent with observational data.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Physics, Nuclear
Yessica Dominguez, Rolando Gaitan
Summary: The paper reviews classical aspects of Metric-Affine Gravity in the context of F-(n)(R) type models and topologically massive gravity, exploring the consistency of field equations at the nonperturbative level. It is found that discrepancies in field equations for F-(n)(R) theories can be solved by imposing nonmetricity and torsion constraints. This discrepancy is particularly evident for F-(2)(R) models, emphasizing the importance of these constraints for resolving physical solutions.
INTERNATIONAL JOURNAL OF MODERN PHYSICS A
(2021)
Article
Astronomy & Astrophysics
A. Emir Gumrukcuoglu, Rampei Kimura, Michael Kenna-Allison, Kazuya Koyama
Summary: In Generalised Massive gravity, a non-linear analysis of perturbations around cosmological solutions was conducted, leading to the discovery of a new type of non-linear solution for the scalar mode and confirmation of the presence of the Vainshtein screening mechanism. The PPN parameter approaches its GR value at solar system scales and meets current constraints.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Daisuke Miki, Akira Matsumura, Kazuhiro Yamamoto
Summary: The research focuses on the gravity-induced entanglement dynamics of N massive particles, showing that with an increase in particle number, specific particle pairs decohere more easily. The timescale of gravity-induced decoherence and the monogamy of entangled particles were also discussed.
