Starting the Universe from strong gravity regime

• Valery Rubakov (Institute for Nuclear Research of RAS)

A de-Sitter no-hair theorem for spacetimes with isometry group forming two-dimensional orbits

• Leonardo Senatore

New boundary conditions for cosmology

• Neil Turok

From Wormholes and Baby Universes to Inflation and the Measure Problem

• Arthur Hebecker

Gravity and Axion

• Gia Dvali

Quantum gravity from the beginning to the present Universe

• Christof Wetterich

Gravitational wave production in non-local Starobinsky model

• Anna Tokareva

Path integrals in some 2D and 4D quadratic gravity models

• Vladimir Belokurov

Field redefinitions, perturbative unitarity, and Higgs inflation

• Georgios Karananas

Higgs inflation as a door to gravity

• Syksy Räsänen

Scale symmetry, the Higgs and the Nature of Gravity

• Javier Rubio

IR effects in de Sitter and in Inflation

• Victor Gorbenko

Bootstrapping large graviton non-Gaussianities

• Enrico Pajer

Gravitational interferometers and cosmological observations of the cosmic microwave background offer us the prospect to probe the laws of gravity in the primordial universe. To study and interpret these datasets we need to know the possible graviton non-Gaussianities. To this end, we derive the most general tree-level three-point functions (bispectra) for a massless graviton to all orders in derivatives, assuming scale invariance. Instead of working with explicit Lagrangians, we take a bootstrap approach and obtain our results using the recently derived constraints from unitarity, locality and the choice of vacuum. Since we make no assumptions about de Sitter boosts, our results capture the phenomenology of large classes of models such as the effective field theory of inflation and solid inflation. We present formulae for the infinite number of parity-even bispectra. Remarkably, for parity-odd bispectra, we show that unitarity allows for only a handful of possible shapes: three for graviton-graviton-graviton, three for scalar-graviton-graviton and one for scalar-scalar-graviton, which we bootstrap explicitly. These parity-odd non-Gaussianities can be large, for example in solid inflation, and therefore constitute a concrete and well-motivated target for future observations.

Fundamental Physics from Galaxy Surveys

• Mikhail Ivanov

The distribution of galaxies on large scales is a sensitive probe of cosmological physics. In particular, the structure of this distribution depends on properties of dark matter and the dynamics of the early universe. Understanding this dependence, however, is a challenging task because the observed galaxy distribution is modulated by a variety of non-linear effects. I will present theoretical tools that have allowed for a systematic analytic description of these effects. These tools play a central role in a new program of extracting cosmological information from galaxy surveys. I will share some results of this program from my independent analysis of the public data from the Baryon acoustic Oscillation Spectroscopic Survey. These results include the measurement of the Hubble constant as well as constraints on new physics and the early Universe.

Generation of peaks in primordial perturbation spectra due to variable number of slow-roll inflatons

• Alexei Starobinsky

Cosmological attractors after Planck/BICEP/Keck

• Andrei Linde

Aspects of High Scale Leptogenesis with Low Energy CP Violation

• Serguey Petcov

Resonant Leptogenesis

• Björn Garbrecht

Testable scenarios of leptogenesis

• Marco Drewes

2PI-approach to particle production and phase transition dynamics

• Kimmo Kainulainen

CosmoLattice: The Art of Simulating the Early Universe

• Daniel Figueroa

Lattice simulations of inflation and reheating

• Kaloian Lozanov

Gravitation portals and particle production during inflationary reheating

• Keith Olive

Small-scale structure in vector dark matter

• Mustafa Amin

Vacuum Energy of the Universe, Large scale magnetic field and nontrivial topology in Quantum Field Theory

• Ariel Zhitnitsky

Lorentzian Description of the 1st Order Phase Transition

• Kohei Kamada

Primordial Black Holes and Vacuum Decay

• Ruth Gregory

Cosmological implications of Higgs vacuum metastability

• Arttu Rajantie

A novel technique for the description of gauge-field production during axion inflation

• Oleksandr Sobol

Electroweak model in a strong magnetic field

• Maxim Chernodub

Cosmological stochastic gravitational wave backgrounds in LISA

• Chiara Caprini

Probing the scale of grand unification with gravitational waves

• Valerie Domcke

Cosmic strings and black holes

• Alexander Vilenkin

The nature of Dark Matter: what can we learn from astrophysical data expected in the next few years

• Alexey Boyarsky

Dark Matter abundance via thermal decays and leptoquark mediators

• Alessandro Strumia

Primordial black holes and their observational constraints

• Kazunori Kohri

Big Bang nucleosynthesis -- new about old

• Oleg Ruchayskiy

The problem of instability of gravitational baryogenesis and its possible resolution

• Elena Arbuzova

Primordial black holes as dark matter from inflation

• Guillermo Ballesteros

Primordial black holes in the universe and antistars in Milky Way

• Alexander Dolgov

Primordial black holes as dark matter

• Alexander Kusenko