**Neil Turok**

*We came for something, something violent, something extraordinary.*

Two possibilities:

1. Time non exist in the beginning.

2. 10 spatial dimensions + time

(BRANE) We have to be almost two branes. When they collide, remained extended. Plasma and matter. All is measured.

Sitter spacetime scale factor and the gravitational wave perturbations a scale-invariant spectrum (|v_{k}/a|^{2 }∝hH^{2}/k^{3})γ_{ij}(x) is the three-metric for a maximally symmetric space.

The Penrose diagram of the Sitter spacetime in the flat slicing.

Check out: **Quantum Incompleteness of Inflation**

Authors: __Alice Di Tucci__, __Job Feldbrugge__, __Jean-Luc Lehners__, __Neil Turok__

Journal ref: Phys. Rev. D 100, 063517 (2019)

The discussion emphasizes that, even if the inflationary scale is far below the Planck mass, new physics is required to explain the initial quantum state of the universe.

**Param Singh **

t=0

10^{-34} star the universe.

Infinite = small universe

Repulsive gravity. Rebounded universe. Big Bounce. Cyclic stages.

Big Bang wasn’t the beginning.

**Michio Kaku**

All emerge on an instant for nothing (no space, no equations, no time) – perfect Vacuum -Energy transforming in matter.

**Andrei Linde**

Inflation. Smooth universe in every direction. Massive universe. Is needed the Big Bang? Heavy vacuum and eternal inflation. Multiverse…

Too arbitrary, yep! Swiss cheese model.

**Lee Smolin**

Everything for nothing. Singularity.

Evolution laws. Ancestor: Black Hole Universe.

Offspring Universe.

**Roland Penrose**

Expanded universe (no matter, no photons, no clock).

**Laura Mersini-Houghton
**

Universe as a wave. String Theory.

Void in the CMB. Presence of neighboring universes.

Laura Mersini-Houghton

https://arxiv.org/abs/1807.10833

Testing Predictions of the Quantum Landscape Multiverse 3: The Hilltop Inflationary Potential, present the Hilltop model, and the corrections introduced by the entanglement in the quantum landscape multiverse to the slow-rolling inflaton field and to the inflaton potential, showing as anomalies in the CMB spectrum.

Authors: __Eleonora Di Valentino__, __Laura Mersini-Houghton__

The quantum landscape multiverse describes the emergence of the universe from a wavefunction on the landscape before inflation, to a present-day classical universe. Other branches of the wavefunction, originating similarly to ours, are entangled with our universe. This quantum entanglement contributes as a second source a correction term in the gravitational potential of the universe, and it gives rise to modifications of the inflation potential and field evolution.