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 WilczekRelated topics
came constant construct course day deep density due easy empty equilibrium expansion known mass matter mistake model quite space static subsequent thing way weigh weight yet zero einsteinRelated quotes
One should view the present situation – the status quo – as being maintained by certain conditions or forces. A culture – for instance, the food habits of a certain group at a given time – is not a static affair but a live process like a river which moves but still keeps to a recognizable form...Food habits do not occur in empty space. They are part and parcel of the daily rhythm of being awake and asleep; of being alone and in a group; of earning a living and playing; of being a member of a town, a family, a social class, a religious group... in a district with good groceries and restaurants or in an area of poor and irregular food supply. Somehow all these factors affect food habits at any given time. They determine the food habits of a group every day anew just as the amount of water supply and the nature of the river bed determine the flow of the river, its constancy or change.
Kurt Lewin
The characteristics of the struggle, in which territory had to be given to the enemy and many years had to pass in order to achieve final victory, with fluctuations, ebb and flow, was that of a protracted war. During the entire struggle one could say that the front lines were where the enemy was. At a given moment, the enemy occupied almost the entire territory and the front was spread to wherever the enemy was. Later the lines of combat were delimited and a main front was established. But the enemy's rear guard constituted another front; it was a total war and the colonialists were never able to mobilize their forces with ease against the liberated zones. The slogan "dynamism, initiative, mobility, and quick decision in new situations" is in synthesis the guerrilla tactic. These few words expressed the tremendously difficult art of popular war.
Che Guevara
Contrary to what you may assume, I am not a pessimist but an indifferentist-that is, I don't make the mistake of thinking that the resultant of the natural forces surrounding and governing organic life will have any connexion with the wishes or tastes of any part of that organic life-process. Pessimists are just as illogical as optimists; insomuch as both envisage the aims of mankind as unified, and as having a direct relationship (either of frustration or of fulfilment) to the inevitable flow of terrestrial motivation and events. That is-both schools retain in a vestigial way the primitive concept of a conscious teleology-of a cosmos which gives a damn one way or the other about the especial wants and ultimate welfare of mosquitos, rats, lice, dogs, men, horses, pterodactyls, trees, fungi, dodos, or other forms of biological energy.
H. P. Lovecraft
In fact, there is something puzzling about the Higgs mass we now do observe. It is generally known as the "hierarchy problem.” Since it is the Higgs mass that sets the scale for the masses of all other known elementary particles, one might guess that it should be similar to another mass that plays a fundamental role in physics, the so-called Planck mass, which is the fundamental unit of mass in the theory of gravitation. (It is the mass of hypothetical particles whose gravitational attraction for one another would be as strong as the electric force between two electrons separated by the same distance.) But the Planck mass is about a hundred thousand trillion times larger than the Higgs mass. So, although the Higgs particle is so heavy that a giant particle collider was needed to create it, we still have to ask, why is the Higgs mass so small?
Steven Weinberg
If Christ were to walk in this world today, do you know what would happen to Him? He would be placed in a mental institution and given psycho-therapy, just as would His Saints. The world would crucify Him today just as it did 2000 years ago, for the world has not learned a thing, except more devious forms of hypocrisy. And what would happen if, in one of my classes at the university, I would one day tell my students that all the learning of this world is of no importance beside the duty of worshipping God, accepting the God-man who died for our sins, and preparing for the life of the world to come? They would probably laugh at me, and the university officials, if they found out, would fire me-for it is against the law to preach the Truth in our universities. We say that we live in a Christian society, but we do not: we live in a society.
Seraphim Rose