Null Geodesics and Strong Field Gravitational Lensing in a String Cloud Background

<div>Plots of the observables corresponding to <svg height="6.20645pt" id="M216" style="vertical-align:-0.2063999pt" version="1.1" viewbox="-0.0498162 -6.00005 8.55521 6.20645" width="8.55521pt" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><g transform="matrix(.013,0,0,-0.013,0,0)"><path d="M624 292C624 400 569 451 537 451C520 451 497 442 490 436L489 427C521 404 550 351 550 280C550 170 513 51 423 51C383 51 361 87 361 150C361 197 384 301 397 339L391 343L310 328C307 297 301 249 293 212C270 102 223 56 182 56C144 56 114 93 114 172C114 278 161 369 243 430L223 457C99 392 24 290 24 156C24 43 81 -12 141 -12C187 -12 247 32 286 88C295 31 325 -12 380 -12C431 -12 475 16 511 49C581 113 624 195 624 292Z" id="g50-246"></path><glyph.data ascent="3443" descent="-2856" horiz-adv-x="648" vert-adv-y="648"></glyph.data></g></svg>. Dashed lines show the value for the Schwarzschild BH.</div>

Advances in High Energy Physics

fig6

Figure 6

Figure 6: Null Geodesics and Strong Field Gravitational Lensing in a String Cloud Background 