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The graviton is a hypothetical tensor boson proposed to be the carrier of gravitational force in some quantum theories of gravity, but no such theory has been successfully incorporated into the Standard Model, so the Standard Model neither predicts any such particle nor requires it, and no gravitational quantum particle has been indicated by experiment.
A luxon travels as fast as light in vacuum and has no rest mass. A tachyon is a hypothetical particle that travels faster than the speed of light so they would paradoxically experience time in reverse (due to inversion of the theory of relativity) and would violate the known laws of causality. A tachyon has an imaginary rest mass.
Mahāśūnya (महाशून्य) refers to the “great void”, according to Arṇasiṃha’s Mahānayaprakāśa verse 134.—Accordingly, “The Śāmbhava (state) is the one in which the power of consciousness (citi) suddenly (sahasā) dissolves away into the Great Void [i.e., mahāśūnya] called the Inactive (niḥspanda) that is ...
Satipatthana (Pali: Satipaṭṭhāna; Sanskrit: smṛtyupasthāna) is a central practice in the Buddha's teachings, meaning "the establishment of mindfulness" or "presence of mindfulness", or alternatively "foundations of mindfulness", aiding the development of a wholesome state of mind.
The Pali–English Dictionary translates citta as heart or heart-mind, emphasizing it as more the passionate side of the mind, as opposed to manas as the intellect that grasps mental objects (dhamma). Citta is the object of meditation in the third part of Satipatthana, also called Four Foundations of Mindfulness.
In the state of no-mind (acittat), the states of existence or non-existence can be neither found nor established... What is this state of no-mind? The state of no-mind, which is immutable (avikra) and undifferentiated (avikalpa), constitutes the ultimate reality of all dharmas [phenomena]. Such is the state of no-mind. [19]
Turiya as 'the fourth' is referred to in a number of principal Upanishads. [1] One of the earliest mentions of the phrase turiya, "fourth", is in verse 5.14.3 of the Brihadaranyaka Upanishad (7th-6th century BCE), referring to a 'fourth foot' of the Gayatri Mantra, the first, second and third foot being the 24 syllables of this mantra:
The brahmavihārā (sublime attitudes, lit. "abodes of Brahma") is a series of four Buddhist virtues and the meditation practices made to cultivate them. They are also known as the four immeasurables (Pāli: appamaññā) [1] or four infinite minds (Chinese: 四無量心). [2]