Spacetime Junctions and the Collapse to Black Holes in Higher Dimensions

<table>Penrose diagram for <svg height="11.6375" id="M161" style="vertical-align:-0.1638pt" version="1.1" viewbox="0 0 39.362499 11.6375" width="39.362499" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g transform="matrix(.017,0,0,-.017,.062,11.363)"><path d="M671 0h-247v28q49 7 60 18.5t0 45.5l-155 438h-2q-21 -61 -74 -204.5t-75 -210.5q-15 -51 -4.5 -65t67.5 -22v-28h-221v28q50 9 69 26.5t45 84.5l202 517l32 9l194 -535q23 -61 42 -78.5t67 -23.5v-28z" id="x39B"></path></g><g transform="matrix(.017,0,0,-.017,16.432,11.363)"><path d="M512 230l-437 -233v58l378 199v2l-378 200v58l437 -233v-51z" id="x3E"></path></g><g transform="matrix(.017,0,0,-.017,31.136,11.363)"><path d="M241 635q53 0 94 -28.5t63.5 -76t33.5 -102.5t11 -116q0 -58 -11 -112.5t-34 -103.5t-63.5 -78.5t-94.5 -29.5t-95 28t-64.5 75t-34.5 102.5t-11 118.5q0 58 11.5 112.5t34.5 103t64.5 78t95.5 29.5zM238 602q-32 0 -55.5 -25t-35.5 -68t-17.5 -91t-5.5 -105
q0 -76 10 -138.5t37 -107.5t69 -45q32 0 55.5 25t35.5 68.5t17.5 91.5t5.5 105t-5.5 105.5t-18 92t-36 68t-56.5 24.5z" id="x30"></path></g>
</svg> with the FLRW universe (a) recollapsing; (b) nonrecollapsing, showing the matching surfaces and the horizons.</table>

Advances in Mathematical Physics

fig1

Figure 1

Figure 1: Spacetime Junctions and the Collapse to Black Holes in Higher Dimensions 