وَالْجَنَّةُ حَقٌّ، وَالنَّارُ حَقٌّ
Paradise is real, and Hell is real.
Scripture describes entry, reward, punishment, vastness and continued residence in these two abodes. Reducing them to nothing more than metaphors for psychological pleasure or pain does not account for that language.
Affirming real existence, however, does not mean importing every physical law of the present world into the next. Their nature and limits are known through revelation.