Article
Astronomy & Astrophysics
Waqas Ahmed, Tianjun Li, Shabbar Raza, Fang-Zhou Xu
Summary: Gauge coupling unification in the Supersymmetric Standard Models suggests the presence of Grand Unified Theories, which can be probed at future colliders and experiments depending on the GUT scale. Different scenarios with GUTs of varying scales allow for the study of upper limits on proton decay and supersymmetric particle masses.
Article
Physics, Particles & Fields
Waqas Ahmed, Tianjun Li, Shabbar Raza
Summary: This paper studies supersymmetric Grand Unified Theories (GUTs) with gravity mediation in detail. It proposes using the Hyper-Kamiokande experiment and future 100TeV proton-proton colliders to probe the GUTs. The study also analyzes various particle masses and provides concrete scientific goals for the experiments.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Astronomy & Astrophysics
Fulvio Melia
Summary: The recent analysis of Planck data suggests a cutoff in the primordial power spectrum related to the first quantum fluctuation emerging into the semi-classical universe. This has important implications for the question of classicalization.
Article
Physics, Particles & Fields
Aaron Held, Jan Kwapisz, Lohan Sartore
Summary: This article investigates radiative symmetry breaking, constrains the viable initial conditions for scalar couplings, and outlines the feasible parameter space of any underlying theory of quantum gravity. The constraining power of the blueprint is demonstrated within a non-supersymmetric SO(10) grand unification theory.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Review
Physics, Multidisciplinary
Dietrich Boedeker, Wilfried Buchmueller
Summary: This review discusses the current status of baryogenesis with a focus on electroweak baryogenesis and leptogenesis, including models, mechanisms, and constraints. Progress has been made in studying the generation of baryon asymmetry through sphaleron processes and CP-violating decays, with implications for composite Higgs models and neutrino masses. Additionally, advancements in thermal leptogenesis and possible probes of the seesaw mechanism and B - L breaking at the GUT scale by gravitational waves are also highlighted.
REVIEWS OF MODERN PHYSICS
(2021)
Article
Physics, Particles & Fields
Prateek Agrawal, Michael Nee, Mario Reig
Summary: In this study, we demonstrate that the couplings between axions and gauge bosons are greatly restricted in Grand Unified Theories with a simple 4D gauge group incorporating the standard model. The topological nature of these couplings enables them to be matched from the ultraviolet (UV) to the infrared (IR), and the ratio of the anomaly with photons and gluons for any axion is determined by unification. Consequently, the discovery of axions becomes a significant tool for investigating Grand Unification.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Astronomy & Astrophysics
Anibal Faundez, Radouane Gannouji
Summary: We studied the existence and stability of Q-balls in noncanonical scalar field theories. We extended the Vakhitov-Kolokolov stability criterion to K-field theories and derived the condition for well-posed Cauchy problem of perturbations. We found that K,X > 0 and K,X + XK,XX > 0 are necessary but not sufficient conditions, and that perturbations define a strongly hyperbolic system if (K,X - 2002K,XX)(K,X + 2 omega 202K,X X) > 0. The noncanonical scalar field can lower the charge and energy of the Q-ball, improving its stability.
Article
Astronomy & Astrophysics
Lorenzo Calibbi, Xiyuan Gao
Summary: In this study, we revisit minimal nonsupersymmetric models of SU(5) grand unification with the type II seesaw mechanism as the origin of neutrino masses. By imposing the requirement of gauge coupling unification and the proton lifetime bounds, we perform a Bayesian fit to obtain quantitative information on the mass scales of the beyond the Standard Model particles. We then investigate lepton-flavor-violating processes induced by the type II scalar triplet and its SU(5) partners, showing that upcoming searches for different lepton-flavor-violating observables can provide additional information on the masses of the new particles and impose nontrivial constraints on neutrino parameters.
Article
Astronomy & Astrophysics
Giacomo Cacciapaglia, Corentin Cot, Aldo Deandrea, Alan S. Cornell
Summary: A new paradigm of asymptotic grand unification is proposed, without requiring supersymmetry or quantitative unification at any scale. By embedding fermions in different SU(5) bulk fields, baryon number conservation is ensured and proton decay is prevented, while the lightest massive state can potentially serve as dark matter. The model suggests that Yukawa couplings can run to an asymptotically free fixed point in the ultraviolet, with a potential Kaluza-Klein mass of about 2.4 TeV.
Article
Astronomy & Astrophysics
Kingman Cheung, Jui-Lin Kuo, Po-Yan Tseng, Zeren Simon Wang
Summary: This paper investigates a muonphilic axionlike particle (ALP) with a mass lighter than twice the muon mass. In the atmosphere, ALPs in this mass range are produced abundantly from charged-meson decay in air showers and decay inside large-volume Cherenkov detectors. The study finds that current observations constrain the mass range and coupling of muonphilic ALPs.
Article
Physics, Multidisciplinary
Stephen F. King, Silvia Pascoli, Jessica Turner, Ye-Ling Zhou
Summary: The text discusses the relationship between proton decay and gravitational waves, as well as their importance for grand unified theories and the standard model. Experimental evidence may help identify preferred symmetry-breaking routes to SO(10).
PHYSICAL REVIEW LETTERS
(2021)
Article
Astronomy & Astrophysics
Kim Berghaus, Tanvi Karwal
Summary: Thermal friction can solve the Hubble and the large-scale structure tensions by converting scalar field energy into dark radiation. The addition of extra radiation to the Universe can also mitigate the LSS tension. However, the CMB data is incompatible with linear density perturbations of the dark radiation when injected at redshifts close to matter-radiation equality.
Article
Astronomy & Astrophysics
Tomasz P. Dutka, John Gargalionis
Summary: The gauge bosons of the Pati-Salam model cannot mediate proton decay at the renormalizable level, allowing for the possibility of breaking SU(4) (R) SU(2)R at relatively low scales. However, low-scale models in this paper generate dimension-five operators that can cause nucleon decays with unacceptably high rates, even if the operators are suppressed by the Planck scale. Interestingly, there is a complementarity between nucleon-decay limits and meson-decay constraints, and embedding the model into SO(10) leads to the presence of these operators and a lower suppression scale. Under reasonable assumptions, the lower limit on the breaking scale can be constrained to be as high as O(108) GeV.
Article
Physics, Particles & Fields
Yoshihiko Abe, Tetsutaro Higaki, Junichiro Kawamura, Tatsuo Kobayashi
Summary: We propose an SU(5) grand unified model that explains the hierarchies of quark and lepton masses and mixing using the Gamma(6)' modular flavor symmetry. The hierarchical structure is achieved through the Froggatt-Nielsen-like mechanism based on the residual Zeta(T)(6) symmetry. We demonstrate that the Gamma(('))(6) symmetry is the minimal possibility to account for the up-type quark mass hierarchies, given the symmetric nature of the Yukawa matrix. We determine the appropriate combination of representations and modular weights, and provide numeric values for the realistic fermion hierarchies.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Astronomy & Astrophysics
Mahmoud AlHallak, Khalil Kalid Al-Said, Nidal Chamoun, Moustafa Sayem El-Daher
Summary: We investigate natural inflation within the warm inflation paradigm, considering non-minimal coupling to gravity and both strong and weak dissipation limits. We show that for a T-linearly dependent dissipative term, it can accommodate the observables n(s) and r given by Planck 2018 constraints, but with a too-small e-folding number to solve the horizon problem. A T-cubically dependent dissipative term may provide a solution to this e-folding number issue.
Article
Astronomy & Astrophysics
Akhilesh Nautiyal, Sukanta Panda, Avani Patel
INTERNATIONAL JOURNAL OF MODERN PHYSICS D
(2018)
Article
Physics, Particles & Fields
Sumit Kumar, Akhilesh Nautiyal, Anjan A. Sen
EUROPEAN PHYSICAL JOURNAL C
(2013)
Article
Astronomy & Astrophysics
Shruti Thakur, Akhilesh Nautiyal, Anjan A. Sen, T. R. Seshadri
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2012)
Article
Astronomy & Astrophysics
Eduard Masso, Subhendra Mohanty, Akhilesh Nautiyal, Gabriel Zsembinszki
Article
Astronomy & Astrophysics
N. Chandrachani Devi, Akhilesh Nautiyal, Anjan A. Sen
Article
Astronomy & Astrophysics
Hiranmaya Mishra, Subhendra Mohanty, Akhilesh Nautiyal
Article
Astronomy & Astrophysics
Akhilesh Nautiyal
Article
Astronomy & Astrophysics
Pooja Pareek, Akhilesh Nautiyal
Summary: In this study, constraints on the k-inflation model with a Dirac-Born-Infeld (DBI) kinetic term and a power-law kinetic term during reheating are revisited. By parametrizing the reheating phase in terms of parameters such as the reheating temperature, the number of e-folds during reheating, and the effective equation of state during reheating, bounds on the spectral index and tensor-to-scalar ratio can be obtained. Different kinetic terms and potentials have varying impacts on these constraints, with specific conditions needing to be met for agreement with observational data.
Article
Astronomy & Astrophysics
Gaetano Lambiase, Subhendra Mohanty, Akhilesh Nautiyal, Soumya Rao
Summary: The study focuses on dark matter with non-zero electromagnetic form factors, including fermionic and scalar dark matter. Constraints on mass and electromagnetic couplings are determined through observations of CMB and LSS. Analysis of dark matter with multipole moments yields upper bounds on various form factors.
Article
Physics, Multidisciplinary
Kaushik Bhattacharya, Subhendra Mohanty, Akhilesh Nautiyal
PHYSICAL REVIEW LETTERS
(2006)