78 citations · 838 across the 56 of their papers we have counts for
57 papers
Waterfall-modulated -attractors
Renata Kallosh, Andrei Linde, Yusuke Yamada
Hybrid -attractor models \cite{Kallosh:2022ggf} can have significantly greater values of and smaller , while preserving the relation , which is va…
Quintessential α-attractors, updated
Renata Kallosh, Andrei Linde, Marina Shmakova +1
Quintessential -attractor models of single-field inflation and evolving dark energy were constructed about a decade ago. Recently, it was pointed out that some of them might be…
Inflation, Open Universes, and Dark Energy
Anton Chudaykin, Mikhail M. Ivanov, Renata Kallosh +3
We study the impact of spatial curvature () and dynamical dark energy (parametrized by and ) on the spectral index using a combination of cosmic microwave bac…
Moduli trapping mechanism in modular flavor symmetric models
Shota Kikuchi, Tatsuo Kobayashi, Kaito Nasu +1
We discuss how the moduli in modular flavor symmetric models dynamically select enhanced symmetry points at which the residual modular symmetry renders extra matter fields massless…
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…
Chiral gravitational effect in time-dependent backgrounds
Kohei Kamada, Jun'ya Kume, Yusuke Yamada
Gravitational counterpart of the chiral magnetic effect, which is referred as the chiral gravitational effect, can also be of interest in a cosmological setup. In this study, we in…
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…
Renormalization in gravitational leptogenesis with pseudo-scalar-tensor coupling
Kohei Kamada, Jun'ya Kume, Yusuke Yamada
We consider the renormalization in the pseudo-scalar inflation models with the gravitational Chern-Simons term. In this model, lepton asymmetry is generated from the chiral gravita…
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…
Gravitational leptogenesis with kination and gravitational reheating
Kohei Kamada, Jun'ya Kume, Yusuke Yamada +1
We revisit the gravitational leptogenesis scenario in which the inflaton is coupled to gravity by the Chern-Simons term and the lepton asymmetry is generated through the gravitatio…
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…