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Three Advanced Lectures on Inflation
Martin S. Sloth
Lecture notes on inflation. The lectures are three double lectures, held for the first time at the Nordita Winter School 2024 - Particle Physics and Cosmology, covering an advanced…
Soft gravitons as Goldstone modes of spontaneously broken asymptotic symmetries in de Sitter spacetimes
Martin S. Sloth
I demonstrate that soft graviton modes in de Sitter spacetimes are the Goldstone modes of the spontaneously broken asymptotic symmetry group of de Sitter space. I then show that an…
On the primordial correlation of gravitons with gauge fields
Rajeev Kumar Jain, P. Jishnu Sai, Martin S. Sloth
We calculate the primordial correlation of gravitons with an abelian gauge field non-minimally coupled through a dynamical dilaton field or a volume moduli during inflation in the…
Gravitational Absorption Lines
Andrea Palessandro, Martin S. Sloth
We consider the gravitational analogue of Lyman-alpha absorption lines in astronomical spectroscopy. If Einstein gravity with minimally coupled matter is valid up to the Planck sca…
Is Patience a Virtue? Cosmic Censorship of Infrared Effects in de Sitter
Ricardo Z. Ferreira, McCullen Sandora, Martin S. Sloth
While the accumulation of long wavelength modes during inflation wreaks havoc on the large scale structure of spacetime, the question of even observability of their presence by any…
Patient Observers and Non-perturbative Infrared Dynamics in Inflation
Ricardo Z. Ferreira, McCullen Sandora, Martin S. Sloth
We have previously derived the effect of soft graviton modes on the quantum state of de Sitter using spontaneously broken asymptotic symmetries. In the present paper we reinterpret…
Asymptotic Symmetries in de Sitter and Inflationary Spacetimes
Ricardo Z. Ferreira, McCullen Sandora, Martin S. Sloth
Soft gravitons produced by the expansion of de Sitter can be viewed as the Nambu-Goldstone bosons of spontaneously broken asymptotic symmetries of the de Sitter spacetime. We expli…
Large Field Inflation and Gravitational Entropy
Nemanja Kaloper, Matthew Kleban, Albion Lawrence +1
Large field inflation can be sensitive to perturbative and nonperturbative quantum corrections that spoil slow roll. A large number of light species in the theory, which occur…
Radiative Corrections from Heavy Fast-Roll Fields during Inflation
Rajeev Kumar Jain, McCullen Sandora, Martin S. Sloth
We investigate radiative corrections to the inflaton potential from heavy fields undergoing a fast-roll phase transition. We find that a logarithmic one-loop correction to the infl…
Fluctuating geometries, q-observables, and infrared growth in inflationary spacetimes
Steven B. Giddings, Martin S. Sloth
Infrared growth of geometrical fluctuations in inflationary spacetimes is investigated. The problem of gauge-invariant characterization of growth of perturbations, which is of inte…
Cosmological observables, IR growth of fluctuations, and scale-dependent anisotropies
Steven B. Giddings, Martin S. Sloth
We extend semiclassical methods in inflationary cosmology that capture leading IR corrections to correlators. Such large IR effects can be absorbed into a coordinate change when ex…
Cosmological diagrammatic rules
Steven B. Giddings, Martin S. Sloth
A simple set of diagrammatic rules is formulated for perturbative evaluation of ``in-in" correlators, as is needed in cosmology and other nonequilibrium problems. These rules are b…
Semiclassical relations and IR effects in de Sitter and slow-roll space-times
Steven B. Giddings, Martin S. Sloth
We calculate IR divergent graviton one-loop corrections to scalar correlators in de Sitter space, and show that the leading IR contribution may be reproduced via simple semiclassic…
de Sitter limit of inflation and nonlinear perturbation theory
Philip R. Jarnhus, Martin S. Sloth
We study the fourth order action of the comoving curvature perturbation in an inflationary universe in order to understand more systematically the de Sitter limit in nonlinear cosm…
On the One Loop Corrections to Inflation II: The Consistency Relation
Martin S. Sloth
In this paper we extend our previous treatment of the one-loop corrections to inflation. Previously we calculated the one-loop corrections to the background and the two-point corre…
A CMB/Dark Energy Cosmic Duality
Kari Enqvist, Martin S. Sloth
We investigate a possible connection between the suppression of the power at low multipoles in the CMB spectrum and the late time acceleration. We show that, assuming a cosmic IR/U…
Holographic bounds on the UV cutoff scale in inflationary cosmology
Esko Keski-Vakkuri, Martin S. Sloth
We discuss how holographic bounds can be applied to the quantum fluctuations of the inflaton. In general the holographic principle will lead to a bound on the UV cutoff scale of th…
Trans-Planckian Effects in Inflationary Cosmology and the Modified Uncertainty Principle
S. F. Hassan, Martin S. Sloth
There are good indications that fundamental physics gives rise to a modified space-momentum uncertainty relation that implies the existence of a minimum length scale. We implement…