Article
Astronomy & Astrophysics
R. Picoreti, D. Pramanik, P. C. de Holanda, O. L. G. Peres
Summary: In this study, we investigate the production of antineutrinos from solar neutrinos through neutrino decays and present the latest limits on the neutrino lifetime. We consider different channels and interactions, and find that the newest bound is significantly better than previous bounds.
Article
Astronomy & Astrophysics
Amelia Drew, E. P. S. Shellard
Summary: In this study, we performed adaptive mesh refinement simulations of global topological strings and quantitatively investigated the dynamics of the strings. By comparing the oscillating string trajectory with a backreaction model, we found excellent agreement. The results suggest that analytic radiation modeling provides the appropriate cosmological limit for global strings.
Article
Physics, Particles & Fields
Kamila Kowalska, Enrico Maria Sessolo, Yasuhiro Yamamoto
Summary: By utilizing the framework of asymptotically safe quantum gravity, predictions for scalar leptoquark solutions to the b.s and b.c flavor anomalies were derived. The presence of an interactive UV fixed point in the system imposed boundary conditions at the Planck scale, narrowing down the allowed leptoquark mass range. Gravity-driven solutions for b.s anomalies predict a leptoquark mass of 4-7 TeV, within reach of future high-energy colliders, while solutions for b.c anomalies predict a leptoquark mass at the edge of current LHC bounds. Complementary signatures are expected in flavor observables.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Mathematics
Zhimeng Ouyang, Lei Wu
Summary: We consider the non-relativistic quantum Boltzmann equation for fermions and bosons, and using the nonlinear energy method and mild formulation, we prove the global well-posedness under the condition that the density function is near the global Maxwellian and vacuum. This work is a generalization and adaptation of the classical Boltzmann theory, and our main contribution lies in the detailed analysis of the nonlinear operator Q in the quantum context. It is the first part of a long-term project on quantum kinetic equations.
JOURNAL OF DIFFERENTIAL EQUATIONS
(2022)
Article
Astronomy & Astrophysics
Ian Low, Laurentiu Rodina, Zhewei Yin
Summary: In this study, it was found that the higher derivative operators for Nambu-Goldstone bosons exhibit a double copy structure at different orders, with certain operators showing flavor-kinematics duality in their amplitudes.
Article
Physics, Particles & Fields
Kazuya Yonekura
Summary: In this paper, we show how Goldstone bosons can reproduce anomalies of UV theories under the symmetry group G at the nonperturbative level through a general definition of Wess-Zumino-Witten terms. The hidden local symmetry (H) over cap, used to describe Goldstone bosons in the coset construction G/H, plays a crucial role and leads to generalized theta-angles of the hidden local gauge group (H) over cap. This concept is illustrated using SO(N-c) (or Spin(N-c)) QCD-like theories in four dimensions.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Astronomy & Astrophysics
Jesse Daas, Wouter Oosters, Frank Saueressig, Jian Wang
Summary: By setting up a consistent background field formalism, we conducted a detailed study on the renormalization group flow of gravity coupled to Nf Dirac fermions, identifying two infinite families of interacting RG fixed points. These fixed points correspond to quasi-chiral and non-chiral fixed points, showing potential for high-energy completion and becoming weakly coupled in the large Nf-limit.
Article
Materials Science, Multidisciplinary
Zongping Gong, Robert H. Jonsson, Daniel Malz
Summary: This paper presents a systematic study of applying supersymmetry (SUSY) to band topology in noninteracting systems and divides topological insulators and superconductors into three classes based on the local and symmetric property of the supercharge. It also resolves the apparent paradox between the nontriviality of free fermions and the triviality of free bosons by considering the encoding of topological information in the identification map.
Article
Astronomy & Astrophysics
M. Fabbrichesi, C. M. Nieto, A. Tonero, A. Ugolotti
Summary: This study involves adding new vectorlike fermions at the TeV scale, embedding the model into an SU(5) grand unified theory, achieving gauge coupling unification, and avoiding Landau poles in the U(1) gauge and Higgs couplings.
Article
Physics, Particles & Fields
Holger Gies, Abdol Sabor Salek
Summary: We investigate the renormalization flow of Hilbert-Palatini gravity to the lowest non-trivial order and find evidence of an asymptotically safe high-energy completion. By quantizing all degrees of freedom beyond Einstein gravity at a given order, we can track the differences between quantizing Hilbert-Palatini gravity and Einstein gravity, which are parametrized by fluctuations of an additional abelian gauge field. The critical properties of the ultraviolet fixed point of Hilbert-Palatini gravity are similar to those of the Reuter fixed point, but occur at a smaller Newton coupling and exhibit more stable higher order exponents.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Physics, Multidisciplinary
Kevin Costello, Natalie M. Paquette, Atul Sharma
Summary: We propose a holographic duality for a four-dimensional Wess-Zumino-Witten model with an SO(8) target manifold, coupled to scalar-flat Kahler gravity on an asymptotically flat, four-dimensional background known as the Burns metric. The holographic dual is a two-dimensional chiral algebra built out of gauged beta-gamma systems with SO(8) flavor. We test the duality by matching two-point correlators of soft gluon currents with two-point gluon amplitudes, and their leading operator product expansion coefficients with collinear limits of three-point gluon amplitudes.
PHYSICAL REVIEW LETTERS
(2023)
Article
Astronomy & Astrophysics
Gaetano Lambiase, Fabio Scardigli
Summary: This paper presents a method to establish a relationship between the deformation parameter of the generalized uncertainty principle (GUP) and the free parameters of the asymptotically safe gravity program. By computing the Hawking temperature of a black hole through two different approaches, the authors derive a relation between the GUP parameter and the running Newtonian coupling constant.
Article
Physics, Nuclear
Yin-Zhen Xu, Si-Xue Qin, Hong-Shi Zong
Summary: We study chiral symmetry restoration by analyzing the thermal properties of QCD's(pseudo-) Goldstone bosons, such as the pion. The properties of the mesons are obtained from the spectral densities of mesonic imaginary-time correlation functions. In the chiral limit, the pion and its partner sigma degenerate at the critical temperature. At temperatures greater than or similar to Tc, the pion dissociates rapidly, indicating the deconfinement phase transition. Beyond the chiral limit, the pion dissociation temperature can be used to define the pseudo-critical temperature of the chiral phase crossover, which is consistent with the maximum point of chiral susceptibility. A similar analysis for kaon and pseudoscalar s (s) over bar suggests that heavy mesons may survive above Tc.
Article
Mathematics, Applied
Luca Fabbri
Summary: The paper investigates the structure of general spinors in polar form and finds that Weyl and Majorana spinors can be interpreted as pure Goldstone states, without any real degree of freedom.
ADVANCES IN APPLIED CLIFFORD ALGEBRAS
(2022)
Article
Physics, Particles & Fields
Paolo Glorioso, Xiaoyang Huang, Jinkang Guo, Joaquin F. Rodriguez-Nieva, Andrew Lucas
Summary: We have developed a Schwinger-Keldysh effective field theory that describes the hydrodynamics of a fluid with conserved charge and dipole moments. The resulting hydrodynamic modes exhibit unusual features, including sound waves with quadratic dispersion relation and subdiffusive decay rate. The presence or absence of energy conservation significantly affects the decay rates of the hydrodynamic modes. This effective field theory also naturally couples to curved spacetime and background gauge fields, and in the flat spacetime limit, it reproduces the mixed rank tensor fields previously coupled to fracton matter.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Particles & Fields
Andres Vasquez, Celine Degrande, Alberto Tonero, Rogerio Rosenfeld
JOURNAL OF HIGH ENERGY PHYSICS
(2019)
Article
Physics, Particles & Fields
Alfredo Glioti, Riccardo Rattazzi, Luca Vecchi
JOURNAL OF HIGH ENERGY PHYSICS
(2019)
Article
Physics, Particles & Fields
Kaustubh Agashe, Peizhi Du, Majid Ekhterachian, Chee Sheng Fong, Sungwoo Hong, Luca Vecchi
JOURNAL OF HIGH ENERGY PHYSICS
(2019)
Article
Astronomy & Astrophysics
K. Earl, C. S. Fong, T. Gregoire, A. Tonero
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2020)
Article
Physics, Particles & Fields
Diogo Buarque Franzosi, Alberto Tonero
JOURNAL OF HIGH ENERGY PHYSICS
(2020)
Article
Physics, Particles & Fields
Daniel Stolarski, Alberto Tonero
JOURNAL OF HIGH ENERGY PHYSICS
(2020)
Article
Physics, Multidisciplinary
Gabriel Cuomo, Luca Vecchi, Andrea Wulzer
Article
Astronomy & Astrophysics
C. S. Fong, T. Gregoire, A. Tonero
Summary: The article discusses a novel scenario where new physics causes heavy fermion singlets and SM neutrinos to split into pairs of quasi-Dirac states. Above the weak scale, the cosmic matter-antimatter asymmetry can be generated through resonant leptogenesis from the decay of heavy singlets. Nontrivially, the CP violation for leptogenesis is bounded by the light neutrino mass splitting, which can be probed in neutrino oscillation experiments.
Article
Physics, Particles & Fields
Alessandro Valenti, Luca Vecchi
Summary: In this study, we analyze the Nelson-Barr approach to the Strong CP Problem, derive necessary conditions for reproducing the CKM phase and quark masses, and quantify irreducible contributions to the QCD topological angle. We discuss collider, electroweak, and flavor bounds, and find that most of the parameter space above the TeV scale is still allowed in models with down-type mediators.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Alessandro Valenti, Luca Vecchi
Summary: The solution of the Strong CP Problem is based on the spontaneous breaking of CP, requiring a non-generic structure to explain a coincidence between CP-even and CP-odd mass scales. This approach, utilizing gauge invariance and a CP-conserving physics at the Planck scale, predicts a dark sector with potential cosmological signatures.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Luca Vecchi
Summary: Composite axion scenarios provide a theoretical basis for the high-quality existence of the Peccei-Quinn symmetry, naturally embedded in Grand-Unified Theories, and leading to distinctive signatures at low energies, such as additional composite scalars and approximate unification of Standard Model gauge couplings.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Physics, Particles & Fields
Alessandro Valenti, Luca Vecchi, Ling-Xiao Xu
Summary: We propose a model that addresses the strong CP problem by introducing a heavier axion than the standard one. In this model, the quarks of the Standard Model are embedded into a larger non-abelian Grand Color group that splits into ordinary QCD and additional confining dynamics. The model has a minimal field content and can be tested through collider experiments and cosmological observations.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Astronomy & Astrophysics
M. Casarsa, M. Fabbrichesi, E. Gabrielli
Summary: The cross section for lepton pair annihilation into a photon and a dark photon or an axionlike particle remains constant for large center-of-mass energies due to the proportionality between some of the portal operators and the energy. By utilizing a muon collider with a large center-of-mass energy, these portal operators can be enhanced and studied as possible physics beyond the Standard Model. The characteristic signature of the presence of these operators is discussed, and effective interaction scales for dark photons and axionlike particles are determined.
Article
Astronomy & Astrophysics
M. Fabbrichesi, E. Gabrielli
Summary: Research has shown that by simultaneously determining antimuon and positron polarizations, it is possible to distinguish between the axion and dark photon of the dark sector with a 99% confidence level with as few as 6 observed events. However, the massive spin-1 dark portal cannot be distinguished from the axionlike case, and the possibility of the X boson being a massive spin-2 particle is also discussed.
Article
Astronomy & Astrophysics
M. Fabbrichesi, C. M. Nieto, A. Tonero, A. Ugolotti
Summary: This study involves adding new vectorlike fermions at the TeV scale, embedding the model into an SU(5) grand unified theory, achieving gauge coupling unification, and avoiding Landau poles in the U(1) gauge and Higgs couplings.
Article
Astronomy & Astrophysics
Nelson R. F. Braga, Octavio C. Junqueira
Summary: This study investigates the influence of rotation on the transition temperature of strongly interacting matter produced in non-central heavy ion collisions. By using a holographic description of an AdS black hole, the authors extend the analysis to the more realistic case where the matter spreads over a region around the rotational axis. The results show the coexistence of confined and deconfined phases and are consistent with the concept of local temperature in rotating frames developed by Tolman and Ehrenfest.
Article
Astronomy & Astrophysics
Bing Sun, Jiachen An, Zhoujian Cao
Summary: This paper investigates the effect of gravitational constant variation on the propagation of gravitational waves. By employing two analytical methods, the study finds that variations in the gravitational constant result in amplitude and phase corrections for gravitational waves, and the time variation of the gravitational constant can be constrained through the propagation of gravitational waves.
Article
Astronomy & Astrophysics
Abdellah Touati, Zaim Slimane
Summary: This letter presents the first study of Hawking radiation as a tunneling process within the framework of non-commutative gauge theory of gravity. The non-commutative Schwarzschild black hole is reconstructed using the Seiberg-Witten map and the star product. The emission spectrum of outgoing massless particles is computed using the quantum tunneling mechanism. The results reveal pure thermal radiation in the low-frequency scenario, but a deviation from pure thermal radiation in the high-frequency scenario due to energy conservation. It is also found that noncommutativity enhances the correlations between successively emitted particles.
Article
Astronomy & Astrophysics
Shahar Hod
Summary: The travel times of light signals between two antipodal points on a compact star's surface are calculated for two different trajectories. It is shown that, for highly dense stars, the longer trajectory along the surface may have a shorter travel time as measured by asymptotic observers. A critical value of the dimensionless density-area parameter is determined for constant density stars to distinguish cases where crossing through the star's center or following a semi-circular trajectory on the surface has a shorter travel time as measured by asymptotic observers.
