78 citations · 838 across the 56 of their papers we have counts for
42 papers · 1 filter
Deformation of d=4, N> 4 Supergravities Breaks Nonlinear Local Supersymmetry
Renata Kallosh, Yusuke Yamada
We study d=4, supergravities and their deformation via candidate counterterms, with the purpose to absorb UV divergences. We generalize the earlier studies of deformation…
QFT approach to dressed particle processes in preheating and non-perturbative mechanism in kinematically-forbidden regime
Hidetoshi Taya, Yusuke Yamada
We provide a quantum-field theoretic formulation of dressed particle dynamics that systematically include particle production and scattering/decay processes in the preheating era.…
Goldstino Condensation?
Renata Kallosh, Andrei Linde, Timm Wrase +1
It was argued in \cite{DallAgata:2022abm} that the Volkov-Akulov (VA) model as well as similar models in supergravity and the related KKLT model in string theory, suffer from tachy…
Sequestered Inflation
Renata Kallosh, Andrei Linde, Timm Wrase +1
We construct supergravity models allowing to sequester the phenomenology of inflation from the Planckian energy scale physics. The procedure consists of two steps: At Step I we stu…
IIB String Theory and Sequestered Inflation
Renata Kallosh, Andrei Linde, Timm Wrase +1
We develop sequestered inflation models, where inflation occurs along flat directions in supergravity models derived from type IIB string theory. It is compactified on a ${\mathbb{…
Aether SUSY breaking: Can aether be alternative to F-term SUSY breaking?
Yusuke Yamada
We investigate supersymmetry (SUSY) breaking scenarios where both SUSY and Lorentz symmetry are broken spontaneously. For concreteness, we propose models in which scalar fluid or v…
Superadiabatic basis in cosmological particle production: application to preheating
Yusuke Yamada
We discuss the adiabatic basis dependence of particle number in time-dependent backgrounds. In particular, we focus on preheating after inflation, and show that, for the optimal ba…
Stokes phenomenon and gravitational particle production -- How to evaluate it in practice
Soichiro Hashiba, Yusuke Yamada
We revisit gravitational particle production from the Stokes phenomenon viewpoint, which helps us make a systematic way to understand asymptotic behavior of mode functions in time-…
M-theory Cosmology, Octonions, Error Correcting Codes
Murat Gunaydin, Renata Kallosh, Andrei Linde +1
We study M-theory compactified on twisted 7-tori with -holonomy. The effective 4d supergravity has 7 chiral multiplets, each with a unit logarithmic Kähler potential. We propo…
Particle production induced by vacuum decay in real time dynamics
Soichiro Hashiba, Yusuke Yamada, Jun'ichi Yokoyama
We discuss particle production associated with vacuum decay, which changes the mass of a scalar field coupled to a background field which induces the decay. By utilizing the Stokes…
Constructing the Supersymmetric anti-D3-brane action in KKLT
Niccolò Cribiori
The derivation of the complete anti-D3-brane low energy effective action in KKLT is reviewed. All worldvolume fields are included, together with the background moduli. The result i…
Horndeski model in nonlinearly realized supergravity
Yusuke Yamada, Jun'ichi Yokoyama
We construct the Horndeski Lagrangian within non-linearly realized supergravity. We will show that the bosonic part of the Horndeski Lagrangian can be realized. Gravitino naturally…
The supersymmetric anti-D3-brane action in KKLT
Niccolò Cribiori, Christoph Roupec, Timm Wrase +1
An anti-D3-brane plays a crucial role in the construction of semi-realistic cosmological models in string theory. Part of its action provides an uplift term that has been used to l…
Off-shell reduction in 4D conformal supergravity
Yusuke Yamada
We discuss reduction in four dimensional conformal supergravity. In particular, we keep the off-shell structure of supermultiplets (except hypermultiplets). As we will…
Simple Sinflaton-less -attractors
Renata Kallosh, Yusuke Yamada
We construct the simplest inflationary -attractor models in supergravity: it has only one scalar, the inflaton. There is no sinflaton since the inflaton belongs to an orthogonal…
Planck 2018 and Brane Inflation Revisited
Renata Kallosh, Andrei Linde, Yusuke Yamada
We revisit phenomenological as well as string-theoretical aspects of D-brane inflation cosmological models. Phenomenologically these models stand out on par with -attractors, as…
Duality Constraints on Counterterms in Supergravities
Daniel Z. Freedman, Renata Kallosh, Yusuke Yamada
The UV finiteness found in calculations of the 4-point amplitude in supergravity at loop order has not been explained, which motivates our study of the rele…
U(1) symmetric -attractors
Yusuke Yamada
We present a class of supergravity -attractors with an approximate global U(1) symmetry corresponding to the axion direction. We also develop a multi-field generalization of the…
Supertrace formulae for nonlinearly realized supersymmetry
Divyanshu Murli, Yusuke Yamada
We derive the general supertrace formula for a system with chiral superfields and one nilpotent chiral superfield in global and local supersymmetry. The nilpotent multiplet is…
Hypernatural inflation
Andrei Linde, Dong-Gang Wang, Yvette Welling +2
We constructed a model of natural inflation in the context of -attractor supergravity, in which both the dilaton field and the axion field are light during inflation, and the in…
On quantum compatibility of counterterm deformations and duality symmetries in supergravities
Renata Kallosh, Hermann Nicolai, Radu Roiban +1
In supergravities there are hidden symmetries of equations of motion, described by duality groups respectively. UV divergence…
Ghostbusters in supergravity
Toshiaki Fujimori, Muneto Nitta, Keisuke Ohashi +1
supergravity is known to contain a ghost mode associated with higher-derivative terms if it contains with greater than two.We remove the ghost in supergravi…
Internal Supersymmetry and Small-field Goldstini
Diederik Roest, Pelle Werkman, Yusuke Yamada
The dynamics of the Goldstino mode of spontaneously broken supersymmetry is universal, being fully determined by the non-linearly realized symmetry. We investigate the small-field…
Ghost-free vector superfield actions in supersymmetric higher-derivative theories
Toshiaki Fujimori, Muneto Nitta, Keisuke Ohashi +2
We systematically construct ghost-free higher-derivative actions of Abelian vector supermultiplets in four-dimensional global supersymmetric theories. After giving a s…