Article
Physics, Particles & Fields
Christian Gross, Sotirios Karamitsos, Giacomo Landini, Alessandro Strumia
Summary: A new dark sector consisting of a pure non-abelian gauge theory can potentially serve as gravitational dark matter candidates through bound states with long lifetimes, especially when accidental symmetries of group-theoretical nature are present. These bound states can be viable dark matter candidates for certain energy scales greater than or similar to 10^10 GeV.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Edward W. Kolb, Andrew J. Long
Summary: By utilizing the de Broglie-Proca Lagrangian, this study calculated the particle number density generated by gravitational particle production during inflation, taking into account the evolution of the number density during reheating. The research identified potential scenarios for the production of dark-photon dark matter with mass ranging from a micro-electron volt to 10^14 GeV, independent of any coupling between the dark photon and standard-model particles.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Ali Akil, Xi Tong
Summary: The study emphasizes the necessity of resolving apparent gauge dependence in quantum corrections for Higgs-like inflation models and offers a practical shortcut to gauge-independent inflationary observables. By using an effective potential obtained from a specific background current choice, gauge-independent predictions of inflationary observables can be achieved. Furthermore, the use of gauge-invariant current terms can lead to gauge-independent effective potentials and ultimately gauge-invariant inflationary observables in any theory to all orders.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Amin Aboubrahim, Pran Nath, Zhu-Yao Wang
Summary: Analysis of EDGES data reveals an unexpected absorption signal of the redshifted 21-cm line of atomic hydrogen, indicating a deviation from the standard ACDM model. A particle physics model involving dark matter in the hidden sector with a U(1) gauge symmetry and Stueckelberg mechanism is proposed to explain this phenomenon. The presence of millicharged dark matter is suggested as a theoretical basis for producing the observed baryon cooling effect seen by EDGES.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Seungwon Baek
Summary: The study focuses on a generic model where the dark sector consists of Majorana dark matter, an excited state, and a light dark photon. By utilizing the light dark photon Z', the model is able to explain excess electron-recoil data observed in the XENON1T experiment. Additionally, the relic abundance of dark matter is addressed through the thermal freeze-out mechanism via annihilation processes.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Gong Jun Choi, Tsutomu T. Yanagida, Norimi Yokozaki
Summary: The minimal B-L model, which extends the Standard Model with heavy right-handed neutrinos, a complex scalar, and the gauged U(1)(B-L) symmetry, is considered the most compelling minimal model that can explain the small masses of active neutrinos and the baryon asymmetry of the universe. Whether this model can naturally accommodate an interesting dark matter candidate is a related question that is being studied. The study explores the possibility of explaining the current dark matter population using the gauge boson of the U(1)(B-L) symmetry.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Joydeep Chakrabortty, George Lazarides, Rinku Maji, Qaisar Shafi
Summary: This study focuses on magnetic monopoles and strings in non-supersymmetric SO(10) and E-6 grand unified models, examining gauge coupling unification and proton decay in various symmetry breaking schemes. The analysis shows the presence of monopoles with specific mass and flux, as well as cosmic strings in the universe after inflation, emitting gravity waves with a tensor-to-scalar ratio between 0.06 and 0.003 depending on the details of inflationary scenario.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Martin Beneke, Patrick Hager, Robert Szafron
Summary: Soft-collinear gravity is an effective field theory that describes the interaction of collinear and soft gravitons with matter. It exhibits similarities with soft-collinear effective theory of QCD, revealing an emergent soft background gauge symmetry and controlling the collinear field components and inherent inhomogeneity in lambda of invariant objects. This results in a consistent expansion.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Stephen F. King, Silvia Pascoli, Ye-Ling Zhou, Jessica Turner
Summary: This study calculates the GUT and intermediate scales for non-supersymmetric SO(10) breaking chains by solving the renormalisation group equations at the two-loop level, predicting the GUT scale, proton lifetime, cosmic string generation scale, and associated gravitational wave signal. It also determines the surviving SO(10) breaking chains in the event of null results of the next generation of gravitational waves and proton decay searches, as well as correlations between proton decay and gravitational waves scales if these observables are measured.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Kento Asai, Shohei Okawa, Koji Tsumura
Summary: In this study, a simple Dirac fermion dark matter model in U(1)(L μ-L τ) theory was investigated, where a new light gauge boson X plays a crucial role in both dark matter physics and explaining the muon g-2 anomaly. By utilizing a large U(1)(L μ-L τ) charge, the observed dark matter relic density was realized without the need for a resonance effect of the X boson. Additionally, unique neutrino signatures from sub-GeV dark matter psi were predicted based on the mass spectrum.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Hyun Min Lee
Summary: In light of the excess in electron recoil observed in the XENON1T experiment, the study examines the concept of exothermic dark matter composed of two states with mass splitting. By analyzing the required recoil energy for the Xenon excess, the research determines the mass difference between the two component states and discusses the implications of dark matter interactions in the effective theory for exothermic dark matter.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Soo-Min Choi, Jinsu Kim, Pyungwon Ko, Jinmian Li
Summary: Multi-component dark matter scenarios are studied in a model with U(1)(X) dark gauge symmetry, where the symmetry is broken into Z(2) x Z(3) subgroup. This setup includes two dark matter fields, X and Y, with different Z(2) x Z(3) charges, and introduces a new class of SIMP models with a local dark gauge symmetry.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Takuya Hirose, Nobuhito Maru
Summary: In this study, a new inflation scenario is proposed in flux compactification, where a zero mode scalar field of extra components of the higher dimensional gauge field is identified as the inflaton. The inflaton potential is non-local and finite, protected against higher dimensional non-derivative local operators by quantum gravity corrections.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Rupert Coy, Thomas Hambye
Summary: The text discusses the stability of dark matter particles and the potential for decay induced by seesaw physics, showing that this could lead to neutrino lines of intensity comparable to current neutrino telescope sensitivity. Models involving gauge bosons of abelian or non-abelian gauge symmetries are used to illustrate this possibility.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Maira Dutra, Vinicius Oliveira, C. A. de S. Pires, Farinaldo S. Queiroz
Summary: In this model, a mixed warm and hot keV neutrino dark matter is naturally produced by arranging active and sterile neutrinos in the same SU(3)(L) multiplet, with the lightest sterile neutrino serving as dark matter. The heavy sterile neutrinos also play a role in diluting the dark matter density and affecting the population through their out-of-equilibrium decay, which helps to address the issue of overproduction in keV neutrino dark matter. Potential implications for Big Bang Nucleosynthesis and the number of relativistic degrees of freedom are explored in this study.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Multidisciplinary
Anson Hook, Soubhik Kumar, Zhen Liu, Raman Sundrum
PHYSICAL REVIEW LETTERS
(2020)
Article
Physics, Particles & Fields
Soubhik Kumar, Raman Sundrum
JOURNAL OF HIGH ENERGY PHYSICS
(2020)
Article
Physics, Particles & Fields
Kaustubh Agashe, Peizhi Du, Majid Ekhterachian, Soubhik Kumar, Raman Sundrum
Summary: This study focuses on the cosmological transition of 5D warped compactifications, demonstrating the percolation of bubbles of IR-brane nucleating from the black-brane horizon. Through semiclassical treatment of bubble nucleation, a smooth 5D bounce configuration is introduced to control the transition rate effectively. The generalization of the Goldberger-Wise mechanism modifies the IR-brane dynamics for a quicker transition, resolving issues related to supercooling and inconsistencies with data.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Arushi Bodas, Soubhik Kumar, Raman Sundrum
Summary: Non-analyticity in co-moving momenta within the non-Gaussian bispectrum is a distinctive sign of on-shell particle production during inflation. A combination of dimension-5 derivative couplings and chemical potential form operator provides an exception to the usual exponential drop in non-analyticity at masses exceeding the inflationary Hubble scale. This mechanism allows for the direct detection of particles with masses potentially as high as 10^(15) GeV, within the sensitivity of upcoming experiments.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Kaustubh Deshpande, Soubhik Kumar, Raman Sundrum
Summary: Hybrid Inflation is a well-motivated mechanism for cosmic inflation, but faces hierarchy problems; by introducing a discrete twin symmetry, these issues can be addressed, leading to a natural model of non-supersymmetric low-scale inflation.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Soubhik Kumar, Raman Sundrum, Yuhsin Tsai
Summary: Cosmological phase transitions in the primordial universe can generate anisotropic stochastic gravitational wave backgrounds, some of which are related to the cosmic microwave background, and some may exhibit significant non-Gaussianity. By using gravitational wave detectors, it is possible to detect the isocurvature component in the gravitational wave background, opening up a new possibility for observation.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Jeong Han Kim, Soubhik Kumar, Adam Martin, Yuhsin Tsai
Summary: During inflation, heavy particles can be non-adiabatically pair produced through their couplings to the inflaton, resulting in non-trivial spatial distribution of curvature perturbations. This phenomenon generates localized hot spots on the CMB and modifies the CMB power spectra and bispectra, although current measurements are not sensitive to these corrections.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Astronomy & Astrophysics
Subhajit Ghosh, Soubhik Kumar, Yuhsin Tsaia
Summary: Dark radiation is a potential candidate beyond the Standard Model, and its perturbations can have isocurvature components under certain conditions. This study derives constraints on uncorrelated and correlated dark radiation density isocurvature perturbations and explores the differences between free-streaming dark radiation and coupled dark radiation. The preference for a blue-tilt dark radiation isocurvature spectrum is found, which affects the estimation of the Hubble constant and relaxes the H-0 tension.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Xingang Chen, Reza Ebadi, Soubhik Kumar
Summary: This study examines features in the inflationary landscape that can inject extra energies into inflation models and produce on-shell particles with masses larger than the Hubble scale, extending the energy reach of cosmological collider physics program. The mechanisms of classical cosmological collider are studied in two categories of primordial features, including classical oscillations and sharp features in the inflation model, which can excite unsuppressed quantum modes of heavy fields leaving observational signatures in primordial non-Gaussianities.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Physics, Particles & Fields
Joshua W. Foster, Soubhik Kumar, Benjamin R. Safdi, Yotam Soreq
Summary: The study demonstrates that the quantum chromodynamics axion with a decay constant near the Grand Unification (GUT) scale has an ultralight mass near a neV, and axionlike particles with masses near the keV-PeV range and GUT-scale decay constants are also well motivated in axiverse theories with dark nonabelian gauge groups. By combining the misalignment mechanism with a period of early matter domination from the long-lived dark glueballs of the same gauge group, the heavy axions in these models can achieve the correct dark matter abundance. The decay of heavy axion dark matter into two photons may produce mono-energetic electromagnetic signatures that can be detected by current or next-generation space-based telescopes.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Multidisciplinary
R. Acciarri, C. Adams, B. Baller, V. Basque, F. Cavanna, R. T. Co, R. S. Fitzpatrick, B. Fleming, P. Green, R. Harnik, K. J. Kelly, S. Kumar, K. Lang, I. Lepetic, Z. Liu, X. Luo, K. F. Lyu, O. Palamara, G. Scanavini, M. Soderberg, J. Spitz, A. M. Szelc, W. Wu, T. Yang, ArgoNeuT Collaboration
Summary: We present the results of a search for heavy QCD axions performed by the ArgoNeuT experiment at Fermilab. We search for heavy axions produced in the NuMI neutrino beam target and absorber decaying into dimuon pairs, which can be identified using the unique capabilities of ArgoNeuT and the MINOS near detector. We obtain new constraints at a 95% confidence level for heavy axions in the previously unexplored mass range of 0.2-0.9 GeV, for axion decay constants around tens of TeV.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Particles & Fields
Raymond T. Co, Soubhik Kumar, Zhen Liu
Summary: Heavy QCD axions are extensions of the QCD axion that solve the strong CP problem while also addressing the quality problem. These axions, with large decay constants up to PeV, can be produced in significant numbers at beam dump and collider environments. They can decay into long-lived lepton pairs, particularly muons, in a broad class of axion models. Current and future neutrino facilities and long-lived particle searches have the potential to probe significant parts of the heavy QCD axion parameter space through dimuon final states, considering existing constraints primarily from rare meson decays.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Astronomy & Astrophysics
Simon Knapen, Soubhik Kumar, Diego Redigolo
Summary: We investigated the physics case for a dedicated trigger-level analysis for very low mass diphoton resonances at ATLAS and CMS, and introduced a new photon isolation criterion. This significantly increases the acceptance for light particles at the cost of a somewhat larger Standard Model background. We showed how such an analysis would likely provide new experimental coverage for axionlike particles below 15 GeV, bridging the gap with the region covered by flavor factories.
Article
Astronomy & Astrophysics
Majid Ekhterachian, Anson Hook, Soubhik Kumar, Yuhsin Tsai
Summary: The article discusses new bounds on vectors coupled to currents with nonconservation due to mass terms and their growth characteristics. Constraints from the high transverse mass tail of monolepton + MET events at the LHC provide strong limits for most masses below a few keV in Stueckelberg U(1)(L mu-L tau) models.
Article
Astronomy & Astrophysics
Kevin J. Kelly, Soubhik Kumar, Zhen Liu
Summary: Recent research has discovered the potential of heavy axions to solve both the strong CP problem and the axion quality problem, requiring exploration in collider and beam dump environments. The near detector of the Deep Underground Neutrino Experiment has a unique sensitivity to heavy axions in the mass range of 20 MeV to 2 GeV, complementing other future experiments.