http://popups.lib.uliege.be/1373-5411/index.php?id=1525 Index terms fr 0 http://popups.lib.uliege.be/1373-5411/index.php?id=1523 In a previous communication [1], G. NIBART (2001) has proposed a general definition of infinite momentum frames (IMF) from a mathematical point of view which allows to consider IMF with any number of dimensions. In the present communication, we try to build a new concept of space time with IMF. For this purpose, we study some assumptions about infinite momentum frames having n dimensions (IMF-n) : a) usual referential frames can be deduced from IMF-n (with n ≥ 4), b) IMF basis vectors can be associated to spinors. We also illustrate some particular IMF-n instances with the following examples: definition of spinors in an IMF-2, expression in an IMF-2 of the longitudinal Doppler effect including the case of tachyons, and application of IMF-6 to the "6 dimensional universe" [2] which has been defined by G. NIBART (2000). Mon, 15 Jul 2024 10:43:48 +0200 Mon, 15 Jul 2024 10:43:58 +0200 http://popups.lib.uliege.be/1373-5411/index.php?id=1523