scholarly journals $$\alpha $$-attractors from supersymmetry breaking

2021 ◽  
Vol 81 (2) ◽  
Author(s):  
Yermek Aldabergenov ◽  
Auttakit Chatrabhuti ◽  
Hiroshi Isono
Keyword(s):  
Supersymmetry Breaking ◽  
De Sitter ◽  
Radial Part ◽  
Kahler Geometry ◽  
High Scale ◽  
Angular Component ◽  
Fermionic Sector ◽  
Single Field ◽  
De Sitter Vacuum ◽  
Chiral Superfield

AbstractWe construct new models of inflation and spontaneous supersymmetry breaking in de Sitter vacuum, with a single chiral superfield, where inflaton is the superpartner of the goldstino. Our approach is based on hyperbolic Kähler geometry, and a gauged (non-axionic) $$U(1)_R$$ U ( 1 ) R symmetry rotating the chiral scalar field by a phase. The $$U(1)_R$$ U ( 1 ) R gauge field combines with the angular component of the chiral scalar to form a massive vector, and single-field inflation is driven by the radial part of the scalar. We find that in a certain parameter range they can be approximated by simplest Starobinsky-like (E-model) $$\alpha $$ α -attractors, thus predicting $$n_s$$ n s and r within $$1\sigma $$ 1 σ CMB constraints. Supersymmetry (and R-symmetry) is broken at a high scale with the gravitino mass $$m_{3/2} > rsim 10^{14}$$ m 3 / 2 ≳ 10 14 GeV, and the fermionic sector also includes a heavy spin-1/2 field. In all the considered cases the inflaton is the lightest field of the model.

scholarly journals ANGULAR INFLATION FROM SUPERGRAVITY

2002 ◽  
Vol 17 (25) ◽  
pp. 1627-1634 ◽  
Author(s):  
G. GERMÁN ◽  
ANUPAM MAZUMDAR ◽  
A. PÉREZ-LORENZANA
Keyword(s):  
Supersymmetry Breaking ◽  
Radial Direction ◽  
Radial Field ◽  
Angular Component ◽  
Angular Direction ◽  
Kähler Potential ◽  
Analytical Expressions ◽  
Chiral Superfield ◽  
Inflationary Models

We study supergravity inflationary models where inflation is produced along the angular direction. For this we express the scalar component of a chiral superfield in terms of the radial and the angular components. We then express the supergravity potential in a form particularly simple for calculations involving polynomial expressions for the superpotential and Kähler potential. We show for a simple Polonyi model the angular direction may give rise to a stage of inflation when the radial field is fixed to its minimum. We obtain analytical expressions for all the relevant inflationary quantities and discuss the possibility of supersymmetry breaking in the radial direction while inflating by the angular component.

scholarly journals Gravitino condensate in N = 1 supergravity coupled to the N = 1 supersymmetric Born–Infeld theory

2020 ◽  
Vol 2020 (1) ◽  
Author(s):  
Ryotaro Ishikawa ◽  
Sergei V Ketov
Keyword(s):  
Supersymmetry Breaking ◽  
Effective Potential ◽  
Cosmological Term ◽  
Positive Contribution ◽  
De Sitter ◽  
Negative Contribution ◽  
Slow Roll ◽  
Cosmological Inflation ◽  
Physical Consequences ◽  
De Sitter Vacuum

Abstract The $N=1$ supersymmetric Born–Infeld theory coupled to $N=1$ supergravity in four spacetime dimensions is studied in the presence of a cosmological term with spontaneous supersymmetry breaking. The consistency is achieved by compensating a negative contribution to the cosmological term from the Born–Infeld theory by a positive contribution originating from the gravitino condensate. This leads to an identification of the Born–Infeld scale with the supersymmetry-breaking scale. The dynamical formation of the gravitino condensate in supergravity is reconsidered and the induced one-loop effective potential is derived. Slow-roll cosmological inflation with the gravitino condensate as the inflaton (near the maximum of the effective potential) is viable against the Planck 2018 data and can lead to the inflationary (Hubble) scale as high as $10^{12}$ GeV. Uplifting the Minkowski vacuum (after inflation) to a de Sitter vacuum (dark energy) is possible by the use of the alternative Fayet–Iliopoulos term. Some major physical consequences of our scenario for reheating are also briefly discussed.

scholarly journals Inflation from high-scale supersymmetry breaking

2018 ◽  
Vol 97 (11) ◽  
Author(s):  
Valerie Domcke ◽  
Kai Schmitz
Keyword(s):  
Supersymmetry Breaking ◽  
High Scale

scholarly journals Squeezed states in the de Sitter vacuum

2003 ◽  
Vol 68 (6) ◽  
Author(s):  
Martin B. Einhorn ◽  
Finn Larsen
Keyword(s):  
Squeezed States ◽  
De Sitter ◽  
De Sitter Vacuum

scholarly journals Dynamics of Electromagnetic Fields and Structure of Regular Rotating Electrically Charged Black Holes and Solitons in Nonlinear Electrodynamics Minimally Coupled to Gravity

Universe ◽  
2019 ◽  
Vol 5 (10) ◽  
pp. 205 ◽  
Author(s):  
Irina Dymnikova ◽  
Evgeny Galaktionov
Keyword(s):  
Black Holes ◽  
Electromagnetic Fields ◽  
Nonlinear Electrodynamics ◽  
Axially Symmetric ◽  
De Sitter ◽  
Dynamical Equations ◽  
Naked Singularities ◽  
Charged Black Holes ◽  
De Sitter Vacuum ◽  
Electrically Charged

We study the dynamics of electromagnetic fields of regular rotating electrically charged black holes and solitons replacing naked singularities in nonlinear electrodynamics minimally coupled to gravity (NED-GR). They are related by electromagnetic and gravitational interactions and described by the axially symmetric NED-GR solutions asymptotically Kerr-Newman for a distant observer. Geometry is described by the metrics of the Kerr-Schild class specified by T t t = T r r ( p r = − ρ ) in the co-rotating frame. All regular axially symmetric solutions obtained from spherical solutions with the Newman-Janis algorithm belong to this class. The basic generic feature of all regular objects of this class, both electrically charged and electrically neutral, is the existence of two kinds of de Sitter vacuum interiors. We analyze the regular solutions to dynamical equations for electromagnetic fields and show which kind of a regular interior is favored by electromagnetic dynamics for NED-GR objects.

scholarly journals Graviatoms with de Sitter Interior

2013 ◽  
Vol 2013 ◽  
pp. 1-13 ◽  
Author(s):  
Irina Dymnikova ◽  
Michael Fil’chenkov
Keyword(s):  
Black Hole ◽  
Dark Matter ◽  
Dark Energy ◽  
Charged Particle ◽  
Energy Spectrum ◽  
Primordial Black Hole ◽  
De Sitter ◽  
Fundamental Symmetry ◽  
Gravitational Vacuum ◽  
De Sitter Vacuum

We present a graviatom with de Sitter interior as a new candidate to atomic dark matter generically related to a vacuum dark energy through its de Sitter vacuum interior. It is a gravitationally bound quantum system consisting of a nucleus represented by a regular primordial black hole (RPBH), its remnant or gravitational vacuum soliton G-lump, and a charged particle. We estimate probability of formation of RPBHs and G-lumps in the early Universe and evaluate energy spectrum and electromagnetic radiation of graviatom which can in principle bear information about a fundamental symmetry scale responsible for de Sitter interior and serve as its observational signatures.

scholarly journals Gluino decay as a probe of high scale supersymmetry breaking

2012 ◽  
Vol 2012 (11) ◽  
Author(s):  
Ryosuke Sato ◽  
Satoshi Shirai ◽  
Kohsaku Tobioka
Keyword(s):  
Supersymmetry Breaking ◽  
High Scale

scholarly journals Probing the Higgs sector of high-scale supersymmetry-breaking models at the Tevatron

2011 ◽  
Vol 83 (5) ◽  
Author(s):  
Marcela Carena ◽  
Patrick Draper ◽  
Sven Heinemeyer ◽  
Tao Liu ◽  
Carlos E. M. Wagner ◽  
...  
Keyword(s):  
Supersymmetry Breaking ◽  
Higgs Sector ◽  
High Scale

ON THE SUPERSTRING HAMILTONIAN IN THE FRIEDMANN SPACE–TIME

2006 ◽  
Vol 15 (06) ◽  
pp. 845-868 ◽  
Author(s):  
M. D. POLLOCK
Keyword(s):  
Cosmological Solution ◽  
Vacuum State ◽  
Einstein Condensate ◽  
De Sitter ◽  
Superstring Theory ◽  
Bose Einstein Condensate ◽  
Higher Derivative ◽  
Effective Lagrangian ◽  
State Formula ◽  
De Sitter Vacuum

The ten-dimensional effective Lagrangian [Formula: see text] for the gravitational sector of the heterotic superstring theory is known up to quartic higher-derivative order [Formula: see text]. In cosmology, the reduced, four-dimensional line element assumes the Friedmann form ds2 = dt2 - a(t)2dx2, where t is comoving time and a(t) ≡ a0eα(t) is the radius function of the three-space dx2, whose curvature is k = 0, ± 1. The four-Lagrangian can then be expressed as the power-series [Formula: see text], where ˙ ≡ d/dt, from which the field equation can be derived by the method of Ostrogradsky. Here, we determine the coefficients Λ0, An, Bn, Cn, and Kn, which are all non-vanishing in general. We recover the previously obtained, high-curvature, anti-de Sitter vacuum state [Formula: see text] with effective cosmological constant Λ = {18/[175ζ(3) - 1/2]}1/3A r κ-2, whose existence makes it possible to envisage a singularity-free and horizon-free cosmological solution, stable to linear perturbations. It is interesting that all the coefficients of quartic origin arise from the near-cancellation of sums of opposite sign but magnitude f ≈ (28.6–369) times larger than the answer. They thus exhibit a slight asymmetry with regard to positive and negative energies, the anti-de Sitter vacuum being characterized by positive Nordström energy, and therefore only accessible at high curvatures. This vacuum state is a Bose–Einstein condensate of non-interacting gravitons at zero temperature, which, referred to comoving time, can only be formulated after the Wick rotation t → ±iτ, resulting in an imaginary horizon.

scholarly journals Supersymmetry breaking branes on solvmanifolds and de Sitter vacua in string theory

2011 ◽  
Vol 2011 (5) ◽  
Author(s):  
David Andriot ◽  
Enrico Goi ◽  
Ruben Minasian ◽  
Michela Petrini
Keyword(s):  
String Theory ◽  
Supersymmetry Breaking ◽  
De Sitter ◽  
De Sitter Vacua
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