“All kinds of questions remain. Many have to do with cosmology. How did the universe originate? How did the galaxies become distributed in space like the suds in the kitchen sink, as one of my colleagues has described it? Why is the cosmological constant apparently very tiny but non-zero and has a peculiar value that leads the universe to expand more rapidly?”

— Sheldon L. Glashow

The Elegant Universe, NOVA Interview (2003)

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Sheldon L. Glashow 5

American theoretical physicist 1932

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“It was early 1932, when Einstein and I both were at the California Institute of Technology in Pasedena, and we just decided to look for a simple relativistic model that agreed reasonably well with the known observational data, namely, the Hubble recession rate and the mean density of matter in the universe. So we took the space curvature to be zero and also the cosmological constant and the pressure term to be zero, and then it follows straightforwardly that the density is proportional to the square of the Hubble constant. It gives a value for the density that is high, but not impossibly high. That's about all there was to it. It was not an important paper, although Einstein apparently thought that it was. He was pleased to have a simple model with no cosmological constant. That's it.”

Willem de Sitter (1872–1934) Dutch cosmologist

As quoted by Helge Kragh, Masters of the Universe: Conversations with Cosmologists of the Past (2014)

“It is quite easy to include a weight for empty space in the equations of gravity. Einstein did so in 1917, introducing what came to be known as the cosmological constant into his equations. His motivation was to construct a static model of the universe. To achieve this, he had to introduce a negative mass density for empty space, which just canceled the average positive density due to matter. With zero total density, gravitational forces can be in static equilibrium. Hubble's subsequent discovery of the expansion of the universe, of course, made Einstein's static model universe obsolete. …The fact is that to this day we do not understand in a deep way why the vacuum doesn't weigh, or (to say the same thing in another way) why the cosmological constant vanishes, or (to say it in yet another way) why Einstein's greatest blunder was a mistake.”

Frank Wilczek (1951) physicist

Longing for the Harmonies: Themes and Variations from Modern Physics (1987)

“The way in which the universe expands is determined by the variation of this [radius of curvature] R with the time. There are three types, or families, of non-static universes… the oscillating universes, and the expanding universes of the first and of the second kind. …each of these is a representative of a family, comprising an infinite number of members differing in size and shape. …In the expanding family of the first kind the radius is continually increasing from… zero… In the expanding series of the second type the radius has at the initial time a certain minimum value, different for the different members of the family. [Both kinds of expanding families] become infinite after an infinite time.”

Willem de Sitter (1872–1934) Dutch cosmologist

Kosmos (1932)

“In all there are four arguments here for the multiverse: the failure of conventional methods for understanding why the cosmological constant is not large, the success of the environmental theories for doing so, the successful prediction of the nonzero cosmological constant, and the string landscape.”

Joseph Polchinski (1954–2018) physicist working on string theory

[Why trust a theory? Some further remarks (part 1)., arXiv.org, 2016, http://arxiv.org/abs/1601.06145] (p. 4)

“In many cultures, the customary answer is that a God or Gods created the Universe out of nothing. But if we wish to pursue this question courageously, we must of course ask the next question: where did God come from? If we decide that this is an unanswerable question, why not save a step and conclude that the origin of the Universe is an unanswerable question? Or, if we say that God always existed, why not save a step, and conclude that the Universe always existed? That there's no need for a creation, it was always here. These are not easy questions. Cosmology brings us face to face with the deepest mysteries, questions that were once treated only in religion and myth.”

Carl Sagan (1934–1996) American astrophysicist, cosmologist, author and science educator

Cosmos: A Personal Voyage (1990 Update), "The Edge of Forever" [Episode 10]
Context: But we don't yet know whether the Universe is open or closed. More than that, there are a few astronomers who doubt that the redshift of distant galaxies is due to the doppler effect, who are skeptical of the expanding Universe and the Big Bang. Perhaps our descendants will regard our present ignorance with as much sympathy as we feel to the ancients for not knowing the Earth went around the Sun. If the general picture, however, of a Big Bang followed by an expanding Universe is correct, what happened before that? Was the Universe devoid of all matter and then the matter suddenly somehow created, how did that happen? In many cultures, the customary answer is that a God or Gods created the Universe out of nothing. But if we wish to pursue this question courageously, we must of course ask the next question: where did God come from? If we decide that this is an unanswerable question, why not save a step and conclude that the origin of the Universe is an unanswerable question? Or, if we say that God always existed, why not save a step, and conclude that the Universe always existed? That there's no need for a creation, it was always here. These are not easy questions. Cosmology brings us face to face with the deepest mysteries, questions that were once treated only in religion and myth.

“Now the origin of the universe that you know, as I have described it, was of course a master event. The initial action did not occur in space or time, but formed space and time.”

Jane Roberts (1929–1984) American Writer

Session 919, Page 373
Dreams, Evolution and Value Fulfillment, Volume Two (1986)

“The vacua with positive cosmological constant trap the universe in eternal inflation. They decay only locally, by producing bubbles of new vacua. Thus, every vacuum in the landscape will be realized an infinite number of times in different, causally disconnected regions. Each bubble expands to become an infinite open universe embedded in the global spacetime.”

Raphael Bousso (1971) American physicist

"Holographic probabilities in eternal inflation." Physical review letters 97, no. 19 (2006): 191302. arXiv preprint https://arxiv.org/abs/hep-th/0605263

“[Indra's Net is a metaphor for] the profound cosmology and outlook that permeates Hinduism. Indra's Net symbolizes the universe as a web of connections and interdependences […] I seek to revive it as the foundation for Vedic cosmology and show how it went on to become the central principle of Buddhism, and from there spread into mainstream Western discourse across several disciplines.”

Rajiv Malhotra book Indra's Net

Indra's Net (2014)

“Besides the ‘how many?’ question, Empedocles seems to be answering two other ancient questions: ‘How did the world come to be as it now is?’ and ‘How did it come to have the creatures that it now has?’. [...] His answers are subtle and intricate.”

Catherine Rowett (1956) Professor of Philosophy at the University of East Anglia (born 1956)

Source: Presocratic Philosophy: A Very Short Introduction (2004), Ch. 1 : Lost words, forgotten worlds

“The currently (2010) widely accepted/believed description of the birth and evolution of the universe and of its contents is "Lambda Cold Dark Matter Concordance Cosmological Model" (LCDM CCM) … My own research was very much confined to the early version of the LCDM CCM (mid-1990's) when I began performing numerical experiments on the satellite galaxies of the Milky Way. I was quite happy with the CCM, as everyone else, and did not bother with the fundamental issues raised by some. With time, however, it became apparent that the LCDM CCM accounts poorly for the properties of the satellite galaxies and their distribution about the Milky Way. Warm dark matter models fared no better.”

Pavel Kroupa (1963) Australian astrophysicist

Pavel Kroupa: Dark Matter, Cosmology and Progress website, July 4, 2010 http://www.astro.uni-bonn.de/~pavel/kroupa_cosmology.html,

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Sheldon L. Glashow 5

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