Dark energy | ScienceGate

The contribution of vacuum fluctuations to the cosmological constant is reconsidered studying the dependence on the used regularisation scheme. Then alternative explanations for the observed accelerated expansion of the universe in the present epoch are introduced which either modify gravity or add a new component of matter, dubbed dark energy. The chapter closes with some comments on attempts to quantise gravity.

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Swampland criteria in the slotheon field dark energy

Physical Review D ◽

10.1103/physrevd.100.024006 ◽

2019 ◽

Vol 100 (2) ◽

Cited By ~ 5

Author(s):

Upala Mukhopadhyay ◽

Debasish Majumdar

Keyword(s):

Dark Energy

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Effective masses in a dense fermion background — Applied to neutrinos, dark matter and dark energy

International Journal of Modern Physics A ◽

10.1142/s0217751x14440102 ◽

2014 ◽

Vol 29 (21) ◽

pp. 1444010

Author(s):

Bruce H. J. McKellar ◽

T. J. Goldman ◽

G. J. Stephenson

Keyword(s):

Dark Matter ◽

Dark Energy ◽

Scalar Field ◽

Effective Mass ◽

Negative Pressure ◽

Expectation Value ◽

Effective Masses ◽

Neutrino Astrophysics

If fermions interact with a scalar field, and there are many fermions present the scalar field may develop an expectation value and generate an effective mass for the fermions. This can lead to the formation of fermion clusters, which could be relevant for neutrino astrophysics and for dark matter astrophysics. Because this system may exhibit negative pressure, it also leads to a model of dark energy.

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