{"id":323598,"date":"2016-11-21T03:00:00","date_gmt":"2016-11-21T00:00:00","guid":{"rendered":"https:\/\/www.fyysika.ee\/?guid=625551b2659049573f3e007601f93919"},"modified":"2016-11-21T03:00:00","modified_gmt":"2016-11-21T00:00:00","slug":"why-ghosts-dont-touch-a-tale-of-two-adventurers-falling-one-after-another-into-a-black-hole-2","status":"publish","type":"post","link":"https:\/\/www.fyysika.ee\/?p=323598","title":{"rendered":"Why ghosts don\u2019t touch: a tale of two adventurers falling one after another into a black hole"},"content":{"rendered":"<p>The case for the utility of Kruskal\u2013Szekeres coordinates in the classroom made by Augousti et al\u00a0in<br \/>\nthis journal (2012 Eur. J. Phys. 33 [http:\/\/https:\/\/doi.org\/10.1088\/0143-0807\/33\/1\/001] 1\u201311 ) is<br \/>\nstrengthened by extending their discussion beyond the event horizon of the black hole. Observations<br \/>\nmade by two adventurers following one another into a Schwarzschild black hole are examined in terms<br \/>\nof these nonsingular coordinates. Two scenarios are considered, the first corresponding to one<br \/>\nobserver following the other closely, the second to a significant distance between the two of them,<br \/>\nprecluding the existence of a common inertial system. In particular, the concepts of distance and<br \/>\ntemporal separation near the horizon and the redshift of the first infaller&#8217;s image as seen by the<br \/>\nsecond are investigated. The results show that the notion of \u2018touching ghosts\u2019 does not correspond<br \/>\nto the local physics of two observers falling into a black hole. The st&#8230;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The case for the utility of Kruskal\u2013Szekeres coordinates in the classroom made by Augousti et al\u00a0in<br \/>\nthis journal (2012 Eur. J. Phys. 33 [http:\/\/https:\/\/doi.org\/10.1088\/0143-0807\/33\/1\/001] 1\u201311 ) is<br \/>\nstrengthened by extending their discussion beyo&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[178],"tags":[],"class_list":{"0":"post-323598","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-rss-fuusikaharidus","7":"entry"},"_links":{"self":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/posts\/323598","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=323598"}],"version-history":[{"count":0,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/posts\/323598\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=323598"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=323598"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=323598"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}