Article
Physics, Particles & Fields
Constantinos Pallis
Summary: New no-scale supergravity models with F-term SUSY breaking are introduced, adopting Kahler potentials parameterizing flat or curved (compact or non-compact) Kahler manifolds. The form of the superpotentials leading to Minkowski vacua is systematically derived. By combining these superpotentials, we can also determine de Sitter or anti-de Sitter vacua. The construction can be easily extended to multi-modular settings of mixed geometry. Corresponding soft SUSY-breaking parameters are also derived.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Physics, Particles & Fields
Constantinos Pallis
Summary: New realizations of gravity-mediated SUSY breaking are introduced, consistent with an R symmetry. By utilizing specific superpotential terms and potentials in the hidden sector superfield and Kahler manifolds, solutions to the mu problem and R axion mass problem are achieved. Through mild violation of the R symmetry, non-vanishing soft SUSY-breaking parameters are obtained, leading to phenomenologically acceptable results.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Astronomy & Astrophysics
Jun-Qian Jiang, Yun-Song Piao
Summary: This study investigates the constraints on early dark energy (EDE) by combining the latest CMB dataset. The results show the existence of nonzero EDE fractions and larger Hubble constants. The inclusion of BAO + Pantheon data has minimal impact on the findings. The data significantly favors axionlike EDE over the standard ACDM model.
Article
Astronomy & Astrophysics
Ernesto Arganda, Antonio Delgado, Roberto A. Morales, Mariano Quiros
Summary: In this study, a novel supersymmetric signal with gluinos decaying into jets and bino-like neutralino is analyzed at the LHC. The signal involves four light jets, four b-jets, and a significant amount of missing transverse energy. Backgrounds such as top quark pairs, V + jets, and top quark pairs with additional electroweak boson productions are identified as challenging, but prospects for discovery at high luminosity phases of the LHC are promising.
Article
Physics, Particles & Fields
Ernesto Arganda, Antonio Delgado, Roberto A. Morales, Mariano Quiros
Summary: This study proposes a search strategy for gluinos with r leptons in the final state at the LHC. The results demonstrate the sensitivity of the search strategy and provide projections for higher luminosity experiments.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Astronomy & Astrophysics
Antonio Delgado, Mariano Quiros
Summary: The study focuses on a cosmologically stable neutral component from a nearly pure SU(2) doublet as a candidate for dark matter, with a mass of around 1.1 TeV. Investigating the role of Higgsino as dark matter in the context of the minimal supersymmetric extension of the Standard Model, the search for light supersymmetric spectra in models with universal and nonuniversal Higgs and gaugino Majorana masses is discussed. The possibilities for detecting the lightest supersymmetric particles, gluino, top squark, and stau, in future collider experiments are also explored.
Article
Physics, Multidisciplinary
Yermek Aldabergenov, Sergei V. Ketov
Summary: By using the Starobinsky supergravity theory and the nilpotent superfield describing Volkov-Akulov goldstino, we find that our model can effectively describe single-field inflation with the ultra-slow-roll phase near a critical point. This can lead to the formation of primordial black holes (PBH) as part of or the entirety of dark matter, while maintaining consistency with the cosmic microwave background (CMB) constraints on the spectral tilt and tensor-to-scalar ratio. After inflation, supersymmetry is spontaneously broken at the inflationary scale, resulting in a vanishing cosmological constant.
FORTSCHRITTE DER PHYSIK-PROGRESS OF PHYSICS
(2023)
Article
Astronomy & Astrophysics
Edward W. Kolb, Andrew J. Long, Evan McDonough
Summary: The study focuses on gravitational particle production of the massive spin-3/2 Rarita-Schwinger field and its close relative, the gravitino, in Friedmann-Robertson-Walker cosmological spacetimes. It reveals a catastrophic gravitational particle production due to a transient vanishing of the helicity-1/2 gravitino sound speed for masses lighter than the Hubble expansion rate after inflation. The research suggests a breakdown of effective field theory and proposes the gravitino swampland conjecture, indicating a possible link to the swampland program.
Article
Physics, Multidisciplinary
D. Farotti, J. B. Gutowski
Summary: This article classifies warped dS(5) backgrounds in D = 11 supergravity with enhanced supersymmetry. The backgrounds preserving different supersymmetries are studied and the corresponding conclusions are given.
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2022)
Article
Astronomy & Astrophysics
Howard Baer, Vernon Barger, Shadman Salam, Dibyashree Sengupta
Summary: Recent research on string theory landscape calculations suggests a Higgs boson mass around 125 GeV and sparticle masses beyond the reach of the high-luminosity LHC. Studies on supersymmetry breaking in BB string models indicate a power law distribution for certain stabilization methods, while large-volume scenarios yield a logarithmic soft term distribution. Evaluations of statistical distributions for the Higgs boson and sparticle masses show peaks around 125 GeV with sparticles beyond the reach of the LHC, albeit with softer distributions than those based on a power law.
Review
Multidisciplinary Sciences
Pedro D. Alvarez, Lucas Delage, Mauricio Valenzuela, Jorge Zanelli
Summary: Supersymmetry plays a crucial role in the extensions of the Standard Model, with potential to simplify systems while emerging as a contingent symmetry depending on features of the vacuum state.
Article
Multidisciplinary Sciences
Sergei M. Kuzenko
Summary: This paper revisits the work of Volkov and Soroka on spontaneously broken local supersymmetry. It is shown for the first time that, for specially chosen theory parameters, the Volkov-Soroka action is invariant under two different local supersymmetries. One acts on the Goldstino for arbitrary parameter values, while the other emerges only in a special case and leaves the Goldstino unchanged. The former can be used to gauge away the Goldstino and obtain the action proposed by Deser and Zumino for consistent supergravity. In this sense, pure N=1 supergravity is a special case of the Volkov-Soroka theory, although not discovered by these authors. The paper also explains how the Volkov-Soroka approach naturally leads to the 1.5 formalism. Our analysis provides a nonlinear realization approach for constructing unbroken N=1 Poincare supergravity.
PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2023)
Article
Physics, Multidisciplinary
D. Farotti, J. B. Gutowski
Summary: We determine the necessary and sufficient conditions for warped product dS(n) solutions, 5 ≤ n ≤ 10, to preserve supersymmetry in D = 11 supergravity. We find that for 7 ≤ n ≤ 10, all such solutions are flat, with a vanishing four-form. Additionally, we show that the only warped product dS(6) solutions are either the maximally supersymmetric AdS(7) x S-4 solution or R-1,R-6 x N-4 where N-4 is hyperKibler, with a vanishing four-form. Supersymmetric warped product dS(5) solutions are classified as generalized M5-brane configurations where the transverse space is R x N-4 and N-4 is a hyperKahler manifold. If the four-form is covariantly constant, then N-4 admits a hyperKahler potential.
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2022)
Article
Physics, Particles & Fields
Yermek Aldabergenov, Auttakit Chatrabhuti, Hiroshi Isono
Summary: This study introduces new models of inflation and spontaneous supersymmetry breaking with a single chiral superfield, where inflaton is the superpartner of the goldstino. Utilizing hyperbolic Kahler geometry and a gauged U(1)(R) symmetry, the models predict values of ns and r within 1 sigma of CMB constraints. Supersymmetry is broken at a high scale with the gravitino mass greater than or similar to 1014 GeV.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Physics, Particles & Fields
Constantinos Pallis
Summary: We propose novel realizations of E-model inflation within Supergravity, where the existence of a pole in the kinetic term of the inflaton superfield is crucial. By tuning the coefficients of the superpotential, inflation can be achieved under certain conditions, and a prediction for the tensor-to-scalar ratio is made.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Astronomy & Astrophysics
John Ellis, Marcos A. G. Garcia, Natsumi Nagata, Dimitri Nanopoulos, Keith A. Olive
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2019)
Article
Astronomy & Astrophysics
John Ellis, Marcos A. G. Garcia, Natsumi Nagata, Dimitri Nanopoulos, Keith A. Olive
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2020)
Article
Physics, Particles & Fields
John Ellis, Marcos A. G. Garcia, Natsumi Nagata, Dimitri Nanopoulos, Keith A. Olive
JOURNAL OF HIGH ENERGY PHYSICS
(2020)
Article
Astronomy & Astrophysics
Marcos A. G. Garcia, Mustafa A. Amin, Daniel Green
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2020)
Article
Astronomy & Astrophysics
C. A. Escobar, A. Martin-Ruiz, O. J. Franca, Marcos A. G. Garcia
Review
Astronomy & Astrophysics
John Ellis, Marcos A. G. Garcia, Natsumi Nagata, Dimitri V. Nanopoulos, Keith A. Olive, Sarunas Verner
INTERNATIONAL JOURNAL OF MODERN PHYSICS D
(2020)
Article
Astronomy & Astrophysics
Marcos A. G. Garcia
Summary: This paper provides a concise summary of out-of-equilibrium dark matter production during post-inflationary reheating, highlighting the sensitivity of dark matter relic abundance to the thermalization rate of the inflaton decay products and the subsequent evolution of the temperature of thermalized radiation. It also discusses how smoking-gun signals such as monochromatic neutrinos, gamma-ray lines, or Lyman-alpha data can help constrain out-of-equilibrium dark matter models.
ASTRONOMISCHE NACHRICHTEN
(2021)
Article
Astronomy & Astrophysics
Marcos A. G. Garcia, Kunio Kaneta, Yann Mambrini, Keith A. Olive
Summary: The perturbative decay of the inflaton and the effects of non-instantaneous reheating on temperature and final state mass were investigated. It was found that the spin statistics of the final state can affect the temperature evolution, and the final state mass can lead to kinematic suppression or enhancement.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Marcos A. G. Garcia, Yann Mambrini, Keith A. Olive, Sarunas Verner
Summary: In this study, models for inflation with a stable inflaton and reheating through scattering processes are considered. It is shown that for a relatively large coupling, reheating is almost instantaneous leading to a relatively high reheating temperature. It is argued that such models can be derived from no-scale supergravity, leading to a scalar singlet dark matter candidate and Higgs portal model.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Marcos A. G. Garcia, Kunio Kaneta, Yann Mambrini, Keith A. Olive, Sarunas Verner
Summary: This article investigates the production of dark matter during the process of reheating after inflation. By comparing perturbative and non-perturbative calculations of energy density and considering the instability of final state scalar products, the resulting relic density based on different approaches is compared. It is shown that the present-day cold dark matter density can be obtained through freeze-in from preheating for a large range of dark matter masses.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
John Ellis, Marcos A. G. Garcia, Dimitri Nanopoulos, Keith A. Olive, Sarunas Verner
Summary: Recent BICEP/Keck data, combined with previous WMAP and Planck data, provide strong new constraints on the tilt in the scalar perturbation spectrum (n(s)) and the tensor-to-scalar ratio (r). These constraints are evaluated in attractor models of inflation formulated in no-scale supergravity, and they determine the number of e-folds of inflation (N-*), the magnitude of the inflaton coupling to matter (y), and the reheating temperature (T-reh). The 68% C.L. region prefers large values of N-*, y, and T-reh, which are constrained by the production of gravitinos and supersymmetric dark matter.
Article
Astronomy & Astrophysics
Emilian Dudas, Marcos A. G. Garcia, Yann Mambrini, Keith A. Olive, Marco Peloso, Sarunas Verner
Summary: It has been argued that in supergravity models of inflation with vanishing sound speeds, the production rate of gravitinos may grow unboundedly. However, certain models can prevent this issue, such as those involving the mixing of Goldstino and inflatino in a time-varying background, and models that eliminate the inflatino.
Article
Astronomy & Astrophysics
Marcos A. G. Garcia, Yann Mambrini, Keith A. Olive, Sarunas Verner
Article
Astronomy & Astrophysics
Marcos A. G. Garcia, Kunio Kaneta, Yann Mambrini, Keith A. Olive
Article
Astronomy & Astrophysics
Thomas Helfer, Eugene A. Lim, Marcos A. G. Garcia, Mustafa A. Amin
