Article
Astronomy & Astrophysics
Tianjun Li, Qianfei Xiang, Xiangwei Yin, Han Zhou
Summary: In this paper, we propose a family universal U(1)X model by choosing the U(1)X gauge symmetry as a linear combination of U(1)Y x U(1)chi of SO(10). We introduce a Dirac fermion as a dark matter candidate and consider isospin violation dark matter to avoid experimental constraints. We study the masses and mixings for Higgs and gauge bosons, and present the viable parameter spaces.
Article
Physics, Particles & Fields
Gui-Jun Ding, Stephen F. King, Jun-Nan Lu, Bu-Yao Qu
Summary: In this study, we investigate the predictions for the creation of electron-positron pairs in two models and discuss the parameter regions that are compatible with the measured values. Additionally, we explore the predictions for various properties such as neutrino masses and CP violation phases.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Astronomy & Astrophysics
Alessandro Di Marco, Amit Dutta Banik, Anish Ghoshal, Gianfranco Pradisi
Summary: We discuss the impact of a nonstandard multiple scalar field cosmology on the thermal history of the Universe and high-scale leptogenesis, focusing on a post-inflationary reheating phase. In particular, we explore models with scalar fields in a brane-inspired dynamical scenario that modify the Boltzmann equations for standard leptogenesis. The lepton asymmetry YL, generated by the decays of heavy Majorana right-handed neutrinos responsible for Standard Model neutrino masses, can be enhanced or reduced depending on the values of the new parameters and the number of additional scalar fields.
Article
Physics, Particles & Fields
V. Suryanarayana Mummidi, Ketan M. Patel
Summary: The viability of a non-supersymmetric renormalizable SO(10) model in explaining observed fermion masses, mixing parameters, and baryon asymmetry through thermal leptogenesis is investigated. The Yukawa sector of the model shows strong correlations among the Yukawa couplings of standard model fermions and the necessity to consider the second lightest RH neutrino and flavor effects for precise computation of leptogenesis. Analytical and numerical solutions in the model are found to be consistent, predicting specific values for neutrino masses and double beta decay effective mass.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Astronomy & Astrophysics
George Lazarides, Rinku Maji, Rishav Roshan, Qaisar Shafi
Summary: This study discusses some testable predictions of a non-supersymmetric SO(10) model supplemented by a Peccei-Quinn symmetry. The model achieves the unification of Standard Model gauge couplings through the symmetry breaking pattern of SO(10), which is also related to inflation driven by an SO(10) singlet scalar field with a Coleman-Weinberg potential. The study predicts multiple observable phenomena, including proton decay, relic abundance of dark matter, and the presence of monopoles and strings in the Universe, and estimates the stochastic gravitational wave background emitted by the strings.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Naoyuki Haba, Yasuhiro Shimizu, Toshifumi Yamada
Summary: In this study, we make predictions on neutrino observables in a nonsupersymmetric renormalizable SO(10) grand unified theory model. We analyze gauge coupling unification conditions, constrain Yukawa couplings, and fit neutrino oscillation data to derive predictions on poorly or not measured neutrino observables. Our work distinguishes itself by not assigning Peccei-Quinn charges on visible sector fields and considering both normal and inverted neutrino mass hierarchies. We find estimates for the Dirac CP phase and sin(2)theta(23) in the neutrino mixing matrix.
Article
Astronomy & Astrophysics
Nobuchika Okada, Digesh Raut, Qaisar Shafi, Anil Thapa
Summary: A pseudo-Goldstone boson dark matter particle is proposed in the context of SO(10) grand unified theory, escaping detection in direct experiments which otherwise would constrain parameter space. Analysis is done on two scenarios of symmetry breaking to the Standard Model, with different implications for allowed parameter space and compatibility with experimental constraints.
Article
Physics, Multidisciplinary
Valerie Domcke, Kohei Kamada, Kyohei Mukaida, Kai Schmitz, Masaki Yamada
Summary: This mechanism, wash-in leptogenesis, operates at low masses of right-handed neutrinos without requiring CP violation, even in the regime of strong wash-out. By generalizing standard freeze-out leptogenesis to a nonminimal cosmological background, it allows for the generation of a nonvanishing B - L asymmetry using chemical potentials generated at high temperatures.
PHYSICAL REVIEW LETTERS
(2021)
Article
Astronomy & Astrophysics
K. S. Babu, Shaikh Saad
Summary: The clockwork mechanism is implemented in SO(10) grand unified theories to explain the origin of fermion masses and mixings. No symmetry distinguishing the three generations is required for the mechanism to emerge realistic mass spectrum.
Article
Astronomy & Astrophysics
Raymond T. Co, Yann Mambrini, Keith A. Olive
Summary: This paper considers the generation of the baryon asymmetry through gravitational scattering, focusing on the reheating process of right-handed neutrinos. The study finds that a sufficient asymmetry can be generated under various conditions. Additionally, it is discovered that gravitational scattering can also produce Standard Model Higgs bosons, which is consistent with the production of a baryon asymmetry.
Article
Physics, Multidisciplinary
Juraj Klaric, Mikhail Shaposhnikov, Inar Timiryasov
Summary: In this paper, it is demonstrated that previously considered different mechanisms of baryon asymmetry generation involving two right-handed Majorana neutrinos are actually united. The study shows that the observed baryon asymmetry can be generated for all experimentally allowed values of the right-handed neutrino masses above 100 MeV, with effective leptogenesis in a broad range of parameters.
PHYSICAL REVIEW LETTERS
(2021)
Article
Geology
Iva Lihter, Kyle P. Larson, Matthijs A. Smit, John M. Cottle, Kyle T. Ashley, Sudip Shrestha
Summary: This study used garnet Lu-Hf geochronology and inclusion U-(Th-)Pb geochronology to investigate midcrustal metamorphic rocks in the eastern Nepalese Himalaya. The results showed that the ages of garnet and inclusions from different time periods do not match, which may affect interpretations relying on a single geochronological method. Furthermore, the garnet ages indicate that some pressure-temperature determinations used in Himalayan models may not be of Himalayan age.
Article
Astronomy & Astrophysics
Ketan M. Patel, Saurabh K. Shukla
Summary: Incorporating standard model Yukawa interactions into a grand unified theory often leads to the prediction of new scalars that couple to fermions, resulting in novel observational effects. In this study, we investigate the possibility of color sextet diquark scalars within realistic renormalizable models based on SO(10) GUT. We find that, in the realm of realistic models, the observed neutron-antineutron oscillation cannot be observed in near future experiments.
Article
Physics, Particles & Fields
Nobuchika Okada, Digesh Raut, Qaisar Shafi
Summary: In this paper, we explore experimentally testable predictions of an SO(10) axion model with two 10-plets of fermions to address the axion domain wall problem. The model allows for the safe breaking of axion symmetry after inflation, resulting in negligible isocurvature perturbations. An unbroken gauge Z2 symmetry in SO(10) guarantees the presence of stable dark matter, which is a combination of electroweak doublets and an SO(10) singlet fermion. Other topics discussed include gauge coupling unification, proton decay, inflation with non-minimal coupling to gravity, and leptogenesis. The predictions made in this paper can be tested in future experiments, such as CMB-S4.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Multidisciplinary Sciences
Bridget B. McGivern, Malak M. Tfaily, Mikayla A. Borton, Suzanne M. Kosina, Rebecca A. Daly, Carrie D. Nicora, Samuel O. Purvine, Allison R. Wong, Mary S. Lipton, David W. Hoyt, Trent R. Northen, Ann E. Hagerman, Kelly C. Wrighton
Summary: This study provides experimental evidence that some soil microbiota can degrade polyphenols under anoxic conditions, contrary to the assumption that polyphenols inhibit organic matter decomposition in oxygen-deprived soils. The researchers used metabolomics and metaproteomics to show the biodegradation of polyphenols and maintenance of soil microbial community metabolism under anoxia.
NATURE COMMUNICATIONS
(2021)
Article
Nanoscience & Nanotechnology
Nadia Garino, Juqin Zeng, Micaela Castellino, Adriano Sacco, Francesca Risplendi, Michele Re Fiorentin, Katarzyna Bejtka, Angelica Chiodoni, Damien Salomon, Jaime Segura-Ruiz, Candido F. Pirri, Giancarlo Cicero
Summary: Nitrogen-doped reduced graphene oxide functionalized with hydroxylated copper ions shows good electrocatalytic performance for the oxygen reduction reaction, with high current retention during stability testing. This material has potential applications in high-performance fuel cells and metal-air batteries.
NPJ 2D MATERIALS AND APPLICATIONS
(2021)
Article
Nanoscience & Nanotechnology
Lorenzo Bastonero, Giancarlo Cicero, Maurizia Palummo, Michele Re Fiorentin
Summary: This study focuses on single-layer PdS2 and PtS2 using advanced theoretical techniques and proposes a novel van der Waals heterostructure with outstanding light absorbance to boost the development of more efficient thin-film photovoltaic devices.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Astronomy & Astrophysics
David Navidad Maeso, Luca Marzol, Martti Raidal, Ville Vaskonen, Hardi Veermae
Summary: The study investigates the evolution of light spectator fields in an asymmetric polynomial potential. It shows that during inflation, these fields can form false vacuum bubbles, which collapse into black holes once they re-enter the horizon. The resulting population of primordial black holes is constrained to contribute at most 1% of the total dark matter abundance, but they can provide observable gravitational wave signals, act as seeds for supermassive black holes, or cause a transient matter-dominated phase in the early Universe.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Physics, Particles & Fields
Emidio Gabrielli, Luca Marzola, Kristjan Muursepp, Ruiwen Ouyang
Summary: This paper explores the stability of the electroweak vacuum within a new paradigm for the origin of Yukawa couplings. The couplings are generated radiatively as low energy effective couplings by interacting with a hidden sector at the one-loop level. By studying two complementary scenarios, it is shown that the framework can achieve vacuum stability without parameter tuning.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Mattia Salomone, Federico Raffone, Michele Re Fiorentin, Francesca Risplendi, Giancarlo Cicero
Summary: Bandgap engineering allows for the modification of electronic and optical properties of semiconductor materials, expanding their potential applications. By substituting In atoms with Ga atoms, the bandgap of layered InSe monolayer can be engineered, making it an excellent candidate for optoelectronics and photonics devices.
Article
Chemistry, Physical
Juqin Zeng, Michele Re Fiorentin, Marco Fontana, Micaela Castellino, Francesca Risplendi, Adriano Sacco, Giancarlo Cicero, M. Amin Farkhondehfal, Filippo Drago, Candido F. Pirri
Summary: In this study, a SbCu2O material was synthesized via one-pot microwave-assisted solvothermal route and its catalytic performance in electrochemical reduction of CO2 was investigated. The Sb-Cu2O bimetallic catalyst exhibited high CO selectivity and good stability.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Article
Astronomy & Astrophysics
Kristjan Kannike, Niko Koivunen, Aleksei Kubarski, Luca Marzola, Martti Raidal, Alessandro Strumia, Venno Vipp
Summary: This study considers the classically scale invariant Higgs-dilaton model and extends it with an extra scalar field as dark matter. The Higgs boson is light near a critical boundary, requiring consideration of quantum corrections beyond the usual Gildener-Weinberg approximation. The model has three free parameters and can explain the observed relic abundance of dark matter while satisfying all constraints. The direct detection cross section mediated by the Higgs boson depends only on the dark matter mass and can be tested in future experiments.
Article
Energy & Fuels
Daniele Sassone, Sergio Bocchini, Marco Fontana, Clara Salvini, Giancarlo Cicero, Michele Re Fiorentin, Francesca Risplendi, Giulio Latini, M. Amin Farkhondehfal, Fabrizio Pirri, Juqin Zeng
Summary: By designing a dual-function electro-organocatalyst, we have successfully catalyzed the reduction of carbon dioxide to carbon monoxide. The catalyst forces carbon dioxide into a non-linear geometry, inducing internal electron charge rearrangement, and combines chemical activation with electrochemical catalysis to achieve efficient conversion.
Article
Chemistry, Physical
Clara Salvini, Michele Re Fiorentin, Francesca Risplendi, Federico Raffone, Giancarlo Cicero
Summary: Using ab initio density functional theory calculations, it was found that the selectivity and reactivity of SnO2 surfaces towards CO2RR can be changed by varying the surface stoichiometry. The SnO2(110) surface is not catalytically active but can be reduced under an applied external bias, leading to the exposure of metal tin layers responsible for formic acid selectivity.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Astronomy & Astrophysics
Nico Benincasa, Luigi Delle Rose, Kristjan Kannike, Luca Marzola
Summary: The inert doublet model is an extension of the Standard Model that has implications for understanding dark matter and cosmic evolution through the study of cosmic phase transitions and gravitational wave signals.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Nanoscience & Nanotechnology
Minglei Sun, Michele Re Fiorentin, Udo Schwingenschlogl, Maurizia Palummo
Summary: Semiconducting two-dimensional materials with the chemical formula MoSi2X4 (X = N, P, or As) were studied using atomistic simulations. It was found that MoSi2X4 has promising optical properties, such as the absence of lateral valleys, small exciton binding energies, and long radiative lifetimes, making it suitable for applications in optoelectronic devices.
NPJ 2D MATERIALS AND APPLICATIONS
(2022)
Article
Chemistry, Physical
Maurizia Palummo, Michele Re Fiorentin, Koichi Yamashita, Ivano E. Castelli, Giacomo Giorgi
Summary: In this paper, we discuss the optoelectronic features and potential applicability of the tin-based oxynitride material InSnO2N for photo-conversion processes. Through the use of Density Functional and Many-Body Perturbation Theory, we calculate the electronic and optical properties and analyze their variations between the nonpolar and polar phases. Additionally, we determine the Spectroscopic Limited Maximum Efficiency of InSnO2N, further highlighting its relevance for solar energy conversion processes.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Alessia Fortunati, Francesca Risplendi, Michele Re Fiorentin, Giancarlo Cicero, Emmanuele Parisi, Micaela Castellino, Elena Simone, Boyan Iliev, Thomas J. S. Schubert, Nunzio Russo, Simelys Hernandez
Summary: The development of efficient CO2 capture and utilization technologies driven by renewable energy sources is essential to reduce the impact of climate change. In this study, seven imidazolium-based ionic liquids were tested as catholytes for electrocatalytic CO2 reduction to CO. Different selectivities for CO2 reduction or H2 evolution were observed among the different ionic liquids.
COMMUNICATIONS CHEMISTRY
(2023)
Article
Chemistry, Physical
Maurizia Palummo, Michele Re Fiorentin, Koichi Yamashita, Ivano E. Castelli, Giacomo Giorgi
Summary: In this study, we discuss the optoelectronic properties of a recently proposed tin-based oxynitride material, InSnO2N, for (photo)catalysis and its potential in photoconversion processes. Using Density Functional and Many-Body Perturbation Theory, we calculate the electronic and optical properties and examine their variations from the nonpolar phase to the more stable polar phase. Additionally, we calculate the Spectroscopic Limited Maximum Efficiency and provide empirical evidence of the importance of InSnO2N in solar energy conversion processes.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Astronomy & Astrophysics
Katri Huitu, Kristjan Kannike, Niko Koivunen, Luca Marzola, Subhadeep Mondal, Martti Raidal
Summary: The recently proposed multiphase criticality principle in Coleman-Weinberg models provides a new explanation for the hierarchy between the electroweak and new physics scales. This principle suggests that a light Higgs boson can exist as a pseudo-Goldstone boson. The mixing between the two light fields carries information about the large scale of symmetry breaking and can explain the apparent absence of new physics at the energy scales tested in current experiments.
Article
Physics, Particles & Fields
Bogdan Damski
Summary: In this paper, we discuss the dynamics of field configurations in the Proca theory of the real massive vector field, specifically focusing on a certain class of electric (magnetic) dipole-charged states. We construct these states to ensure that the long-distance structure of the mean electromagnetic field is initially set by the formula describing the electromagnetic field of the electric (magnetic) dipole. We analyze the evolution of this mean electromagnetic field over time and observe the phenomena of harmonic oscillations of the electric (magnetic) dipole moment far from the center of the initial field configuration, as well as the emergence of a spherical shock wave propagating at the speed of light near the center. Additionally, we discover a unique axisymmetric mean electric field configuration accompanying the mean magnetic field in magnetic dipole-charged states.
Article
Physics, Particles & Fields
Brett McInnes
Summary: The time-dependence of AdS black hole interior geometries poses challenges to holographic duality and the traversability of wormholes. Quantum circuit complexity of strongly coupled matter can address the first challenge. Data from a phenomenological model show an upper bound on the complexity growth rate, which becomes stricter with the addition of angular momentum. The slowing of black hole interior dynamics at high specific angular momentum also occurs.
Article
Physics, Particles & Fields
M. Beccaria, S. Giombi, A. A. Tseytlin
Summary: This article investigates the superconformal index Z of the 6d (2,0) theory on S5 x S1 and describes it using the quantum M2 brane theory in the large N limit. By studying M2 branes in a twisted product of thermal AdS7 and S4, the leading non-perturbative term at large N is shown to be reproduced by the 1-loop partition function of an instanton M2 brane wrapped on S1 x S2 with S2 c S4. Similarly, the partition function of a defect M2 brane wrapped on thermal AdS3 c AdS7 reproduces the BPS Wilson loop expectation value in the (2,0) theory. The article also comments on the analogy of these results with similar computations in the quantum M2 brane partition function in AdS4 x S7/DOUBLE-STRUCK CAPITAL Zk, which reproduced the corresponding localization expressions in the ABJM 3d gauge theory.
Article
Physics, Particles & Fields
Carlos Silva
Summary: This paper explores the nature of spacetime in quantum gravity based on a new version of the holographic principle that establishes a connection between string theory and polymer holonomy structures. The research findings suggest that, for this relationship to hold, spacetime must be perceived as emerging from a fundamental structure with degrees of freedom corresponding to quantum correlations only.
Article
Physics, Particles & Fields
A. Senol, H. Denizli, C. Helveci
Summary: This study investigates new physics using a Monte Carlo method, and the results show stronger limitations on anomalous quartic gauge couplings compared to previous experiments.