Astronomy 2022A/B Lecture Notes - Lecture 9: James Hartle, Grand Unified Theory, Roger Penrose

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Origins and paradoxes: the origin of the uni seems to present us with a variety of paradoxes. I(cid:374) e(cid:454)pe(cid:396)i(cid:373)e(cid:374)ts, pa(cid:396)ti(cid:272)les do(cid:374)(cid:859)t (cid:271)eha(cid:448)e i(cid:374) (cid:449)a(cid:455)s that bt p(cid:396)edi(cid:272)ts. Implies that sub-atomic particles do(cid:374)(cid:859)t al(cid:449)a(cid:455)s ha(cid:448)e (cid:272)lea(cid:396) (cid:272)ut p(cid:396)ope(cid:396)ties. Jamie boley: what was there before the uni, cosmologists usually answer that time itself began with the bb e says time and space closely linked. Paradox 4 infinite regress: te(cid:373)po(cid:396)al: (cid:858)the u(cid:374)i did(cid:374)(cid:859)t (cid:272)o(cid:373)e f(cid:396)o(cid:373) (cid:374)othi(cid:374)g, it (cid:272)a(cid:373)e f(cid:396)o(cid:373) so(cid:373)e p(cid:396)e(cid:272)u(cid:396)so(cid:396)(cid:859, but where did this precursor come from, )e(cid:374)o(cid:859)s pa(cid:396)ado(cid:454): a(cid:272)hilles a(cid:374)d the to(cid:396)toise. The problem with singularities: consider a black hole, everything is mashed down to a single point of width and volume zero. Is critical to maintaining the fires of stars. Claims of tunneling speeds greater than light remain controversial: teleporter not theoretically impossible but, whether the qt process occurs seems to be random.

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