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Allegedly, string theory (in it's simplest form) predicts that cosmological constant must be negative (or zero). Can someone explain where does this result come from? A reference would also be welcome.
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Not even in older literature? Then how to interpret the statement by Wittenmitchell porter said:There is no such "result".
Thanks! Can you give a reference for that?haushofer said:I'm not up to date to all the stringy constructions of backgrounds, but I think the problem you're addressing is deeper: it has to do with supersymmetry. E.g., pure N=1 D=4 supergravity can be constructed in a anti-deSitter background, but not a deSitter background. The reason is that the Jacobi identities of the underlying algebra don't allow for one particular sign of the cosmological constant (corresponding to dS).
See e.g. Freedman& Van Proeyen their sugra textbook, page 251 onward. My supervisor Eric Bergshoeff also published on construction of deSitter sugra on the arxiv, e.g.Demystifier said:Thanks! Can you give a reference for that?
A negative cosmological constant in string theory is a theoretical concept that arises from the equations of the theory. It represents a type of energy that is thought to drive the accelerated expansion of the universe. It is also known as dark energy and is believed to make up about 70% of the total energy in the universe.
The presence of a negative cosmological constant in string theory has significant implications for the structure and evolution of the universe. It is believed to be responsible for the accelerated expansion of the universe, which has been observed through various cosmological experiments and observations. Additionally, it plays a crucial role in the formation of galaxies and other large-scale structures in the universe.
A negative cosmological constant is derived from string theory through a complex mathematical framework that combines elements of quantum mechanics and general relativity. It is an essential part of the equations of string theory and is necessary to reconcile the theory with observations of the universe.
The presence of a negative cosmological constant in string theory has several potential consequences. It could help explain the observed accelerating expansion of the universe and provide a solution to the cosmological constant problem. It could also impact the formation and evolution of structures in the universe and potentially lead to new insights into the nature of dark energy and its role in the universe.
Yes, there are several experiments and observations that support the existence of a negative cosmological constant in string theory. These include measurements of the expansion rate of the universe, the cosmic microwave background radiation, and the large-scale structure of the universe. Additionally, many predictions of string theory, including the presence of a negative cosmological constant, have been confirmed through experiments at the Large Hadron Collider and other particle accelerators.