Article
Physics, Multidisciplinary
Xian Gao
Summary: The authors made a comprehensive classification of scalar monomials and covariant derivatives up to the third order, emphasizing their importance in effective field theory and exploring their complementarity; through systematic classification and derivation, a complete basis of monomials was derived with the potential for novel ghostfree Lagrangians; in addition, diagrammatic representations were developed to simplify the analysis process.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2021)
Article
Astronomy & Astrophysics
Pawan Joshi, Sukanta Panda
Summary: This paper discusses the Ostrogradsky instability issue in nondegenerate higher-order derivative theories, which can be resolved by removing degeneracy in such theories. By decomposing and checking the degeneracy hidden in the Lagrangian, conditions under which the Ostrogradsky instability does not appear can be found.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Mahdi Godazgar, George Long
Summary: In this article, the study of asymptotic gravitational charges is discussed, with a focus on higher derivative charges. The authors find a connection between higher derivative Bondi-Metzner-Sachs (BMS) charges and two-derivative BMS charges. It is noted that internal Lorentz transformations are relevant in the higher derivative case unlike the two-derivative case. The article provides a prescription for the precise definition of these charges and derives the associated charges, once again establishing a relationship with two-derivative BMS charges.
Article
Physics, Particles & Fields
Nephtali Eliceo Martinez-Perez, Cupatitzio Ramirez
Summary: We study the quantum cosmology of supersymmetric, homogeneous and isotropic, higher derivative models. We recall the superfield actions and derive classically equivalent actions leading to second order equations for bosons and first order equations for fermions. Upon quantization, the algebra of fermions leads to a multi-component state that is annihilated by the Hamiltonian and supersymmetric constraint operators. We obtain asymptotic wave functions of the oscillatory type and exact exponential wave functions, which provide probability distributions of the initial curvature compatible with those obtained using the non-supersymmetric model.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Astronomy & Astrophysics
Yuri Makeenko
Summary: This article investigates the two-dimensional four-derivative conformal theory derived from the Nambu-Goto string by path-integration. By using the method of singular products, the author demonstrates that the one-loop approximation provides an exact solution. The solution can be conveniently described using minimal models, where the central charge c in the Kac spectrum depends on the parameters of the four-derivative action. This relation is nonlinear, allowing the mapping of the domain of physical parameters to c < 1, bypassing the KPZ barrier of the Liouville action.
Article
Physics, Particles & Fields
Mohammad R. Garousi
Summary: This paper discusses the restrictions on field redefinitions and corrections to T-duality transformations imposed by boundary conditions. By imposing O(1, 1) and O(d, d) symmetry, the coefficients of gauge invariant bulk and boundary couplings in bosonic string theory are determined.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Physics, Particles & Fields
Pablo A. Cano, Angel J. Murcia, Alberto Rivadulla Sanchez, Xuao Zhang
Summary: We have conducted an extensive study on the holographic aspects of higher-derivative Einstein-Maxwell theories in any dimension. By introducing electromagnetic quasitopological gravities and imposing various physical constraints, we have analyzed charged black hole solutions, thermodynamic properties at finite chemical potential, shear viscosity to entropy density ratio, and charged Renyi entropies. Our results show the possibility of achieving zero viscosity to entropy density ratio and preserving the usual properties of Renyi entropies while satisfying the physical constraints.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Astronomy & Astrophysics
Leslaw Rachwa
Summary: This paper discusses the conditions for ultraviolet finiteness and asymptotic safety in quantum field theory, contrasting the requirements of the two concepts through a specific example. It is shown that a fully UV-finite quantum theory can be achieved by introducing additional terms, rather than adding matter or special symmetries.
Article
Astronomy & Astrophysics
Cao H Nam
Summary: The study presents a novel holographic model and incorporates higher derivative corrections to investigate the color superconductivity (CSC) phase, demonstrating the unique properties of CSC in the context of EGB gravity.
Article
Astronomy & Astrophysics
F. S. Gama, J. R. Nascimento, A. Yu Petrov
Summary: In this study, we calculated the two-loop effective potential for a three-dimensional higher-derivative scalar superfield model and a four-dimensional higher-derivative chiral superfield model, where the higher-derivative operators are described by polynomials of arbitrary degrees.
Article
Astronomy & Astrophysics
An Gong, Kun Liu, Fu-Wen Shu
Summary: A theorem on higher-order derivative theories of gravity is proven, showing that the de Sitter/anti-de Sitter metric is always a solution in any generally covariant theory of gravity. Using this theorem and a general form of entropy function for de Sitter spacetimes, the entropy of de Sitter spacetime in a generally covariant theory of gravity can be calculated without knowing the details of the modified metric. As an example, a general formula for dS entropy in Lovelock gravity is obtained.
Article
Physics, Particles & Fields
Mohsen Alishahiha, Amin Faraji Astaneh, Ali Naseh
Summary: By employing the extended island formula, we computed the entanglement entropy of Hawking radiation for black hole solutions of certain gravitational models containing higher derivative terms. Our results showed that despite the non-unitarity of the corresponding gravitational models, the entropy followed the Page curve, thanks to the contribution of the island.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Yang Huang, Dao-Jun Liu, Hongsheng Zhang
Summary: A class of novel black holes in higher derivative theory is discovered. The novel black holes behave like Schwarzschild ones at large mass limit, but significantly differ from Schwarzschild ones for little holes due to the effects potentially rooted in quantum gravity. The temperature of the hole reaches its maximum at a specific mass, related to the new law introduced in the higher derivative theory, and approaches zero at the little mass limit. This property suggests that the novel black hole may be a candidate for dark matters evading constraint from gamma-ray burst.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Particles & Fields
Kiril Hristov
Summary: We conduct a systematic study on supersymmetric backgrounds in 4d N = 2 Euclidean supergravity with infinite higher derivative corrections. By adopting a Gibbons-Hawking approach, we examine the action evaluation of nuts and bolts for the two maximally symmetric vacua R-4 and H-4 (Euclidean AdS(4)), as well as their unique supersymmetric deformations with (anti-)self-dual Maxwell tensors corresponding to a single nut at the center. Our research provides a rigorous proof for significant parts of the conjecture in [1] and its holographic corollary in [2], with discussions on extensions including the addition of hypermultiplets and the presence of conical defects.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Particles & Fields
Mahdi Godazgar, George Long, Ali Seraj
Summary: This paper demonstrates that charges associated with the internal Lorentz symmetries of general relativity, with higher derivative boundary terms included in the action, can capture observable gravitational wave effects. In particular, the Gauss-Bonnet charge measures the precession rate of a freely-falling gyroscope, while the Pontryagin charge encodes the relative radial acceleration of freely-falling test masses.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
