Compatibility between the scalar field models of tachyon, k-essence and quintessence in f(R, T) gravity
https://www.sciencedirect.com/science/article/abs/pii/S1384107620302360
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evidence that a scientific link has been established between ..
Tachyon
Scalar
Quintessence
Aether
Quintessence: pure and concentrated essence of a substance. the most perfect embodiment of something. (in ancient and medieval philosophy) the fifth essence or element, ether, supposed to be the constituent matter of the heavenly bodies, the others being air, fire, earth, and water.