A remark on alpha vacua for quantum field theories on de Sitter space
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In this paper, it was shown that α-vacua which have been proposed as candidates for states of free quantum fields on de Sitter space have infinitely strong fluctuations for typical observables as the averaged renormalized energy momentum tensor.Abstract:
It is shown that the so-called α-vacua which have been proposed as candidates for states of free quantum fields on de Sitter space have infinitely strong fluctuations for typical observables as the averaged renormalized energy momentum tensor.read more
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Enhanced non-Gaussianity from excited initial states
Richard Holman,Andrew J. Tolley +1 more
TL;DR: In this paper, the effect of choosing an excited inflationary initial state built over the Bunch-Davies state on the CMB bi-spectrum was examined, and it was shown that there are unexpected enhancements in the Bi-Spectrum for certain configurations in momentum space due to interactions of modes in the early stages of inflation.
Journal ArticleDOI
Enhanced Non-Gaussianity from Excited Initial States
Richard Holman,Andrew J. Tolley +1 more
TL;DR: In this paper, the effect of choosing an excited inflationary initial state built over the Bunch-Davies state on the CMB bi-spectrum was examined and shown to be parametrically larger than the standard ones and are potentially observable in current and future data.
Journal ArticleDOI
The IR stability of de Sitter QFT: results at all orders
Donald Marolf,Ian Morrison +1 more
TL;DR: Marolf et al. as discussed by the authors showed that the Hartle-Hawking vacuum for theories of interacting massive scalars in de Sitter space is both perturbatively well-defined and stable in the IR.
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Correlators, Feynman Diagrams, and Quantum No-hair in deSitter Spacetime
TL;DR: In this article, a parametric representation for position-space Feynman integrals of a massive, self-interacting scalar field in deSitter spacetime, for an arbitrary graph, is given as a multiple contour integral over a kernel whose structure is determined by the set of all trees within the graph.
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Inflation with general initial conditions for scalar perturbations
TL;DR: In this paper, the authors explore the possibility of a single field quasi-de Sitter inflationary model with general initial state for primordial fluctuations, and compute the power spectrum and the bispectrum of scalar perturbations with coherent state as the initial state.
References
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Cosmological Event Horizons, Thermodynamics, and Particle Creation
TL;DR: In this article, it was shown that the relationship between event horizons and thermodynamics can be extended to cosmological models with a repulsive cosmology constant, and that the spacetime metric itself appears to be observer-dependent.
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Theorems on the uniqueness and thermal properties of stationary, nonsingular, quasifree states on spacetimes with a bifurcate killing horizon
Bernard S. Kay,Robert M. Wald +1 more
TL;DR: In this article, the authors studied the properties of quasifree states of a linear, scalar quantum field in globally hyperbolic spacetimes possessing a one-parameter group of isometries with a bifurcate Killing horizon.
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Vacuum states in de Sitter space.
TL;DR: In the massless minimally coupled case it is proved that there exists no de Sitter-invariant Fock vacuum state, however one can find Fock states which are E(3) invariant.
Journal ArticleDOI
Radiation damping in a gravitational field
Bryce S. DeWitt,Robert W. Brehme +1 more
TL;DR: In this paper, the validity of equivalence is examined from the point of view of a charged mass point moving in an externally given gravitational field, and a covariant generalization of Dirac's work on the classical radiating electron is presented.
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Microlocal Analysis and¶Interacting Quantum Field Theories:¶Renormalization on Physical Backgrounds
Romeo Brunetti,Klaus Fredenhagen +1 more
TL;DR: In this paper, a perturbative construction of interacting quantum field theories on smooth globally hyperbolic (curved) space-times is presented, based on a formulation of a local spectrum condition in terms of wave front sets of correlation functions of quantum fields.