What is the invisible consciousness or consciousness without surface?

From MN 49 (trans. Sujato): > Consciousness that is invisible, infinite, radiant all round—that’s > what is not within the scope of experience based on earth, water, > fire, air, creatures, gods, the Creator, Brahmā, the gods of streaming > radiance, the gods replete with glory, the gods of abundant fruit, the > Overlord, and the all. > > *Viññāṇaṃ anidassanaṃ anantaṃ sabbato pabhaṃ* ... The invisible consciousness (*viññāṇaṃ anidassanaṃ*) from MN 49 seems to be different from the sense consciousness described in MN 18 e.g. eye-consciousness, ear-consciousness etc. because it is not within the scope of sense experience, according to MN 49. It is also found in DN 11 . It is also translated as "consciousness without surface" (from here , trans. Thanissaro). Question 1: What is the invisible consciousness or consciousness without surface described in MN 49 and DN 11? Is it a cosmic consciousness like the one found in Hinduism? I guess not. Question 2: This answer implies that this invisible consciousness or consciousness without surface is the re-linking consciousness (*patisandhi-viññana*) that connects one lifetime to the next. This also implies that the re-linking consciousness (*patisandhi-viññana*) which is the invisible consciousness or consciousness without surface (*viññāṇaṃ anidassanaṃ*) is the consciousness that descends into the womb causing materiality-mentality (*nāmarūpa*) to arise (from DN 15 ). Is this right? Question 3: Also, the description of "invisible, infinite and radiant all round" sounds very similar to the "luminous mind" (*pabhassara citta*) from AN 1.51-52 . The same word "*pabham*" (luminosity) or "*pabhassara*" (luminous) is used in both MN 49 and AN 1.51-52. How is the invisible consciousness or consciousness without surface related to the luminous mind?