BEGIN:VCALENDAR VERSION:2.0 X-WR-CALNAME:EventsCalendar PRODID:-//hacksw/handcal//NONSGML v1.0//EN CALSCALE:GREGORIAN BEGIN:VTIMEZONE TZID:America/New_York LAST-MODIFIED:20240422T053451Z TZURL:https://www.tzurl.org/zoneinfo-outlook/America/New_York X-LIC-LOCATION:America/New_York BEGIN:DAYLIGHT TZNAME:EDT TZOFFSETFROM:-0500 TZOFFSETTO:-0400 DTSTART:19700308T020000 RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=2SU END:DAYLIGHT BEGIN:STANDARD TZNAME:EST TZOFFSETFROM:-0400 TZOFFSETTO:-0500 DTSTART:19701101T020000 RRULE:FREQ=YEARLY;BYMONTH=11;BYDAY=1SU END:STANDARD END:VTIMEZONE BEGIN:VEVENT CATEGORIES:College of Engineering,Thesis/Dissertations DESCRIPTION:Abstract: Black holes stand among the most profound pr edictions of general relativity, yet their conventional interiors introduc e unresolved conceptual difficulties and deep paradoxes. Recent work by Tz anavaris, Boyle, and Turok has proposed the black mirror as a CPT-symmetri c alternative to the standard black-hole geometry. In the stationary const ruction, the conventional interior is replaced by a second CPT-related ext erior region, with the two exteriors joined at the horizon. Although the s tationary black-mirror geometry can be constructed explicitly, its extensi on to gravitational collapse remains conjectural. This thesis investigates a possible dynamical realization of the black-mirror by using the Vaidya spacetime as a model of spherical gravitational accretion. We construct an d analyze a two-sheeted, CPT-related geometry in which the exterior region s of a black hole are joined at the evolving apparent horizon and examine how the stationary black-mirror structure generalizes as the mass evolves time-dependently. Particular attention in this approach is given to the co nsistency of the proposed matching, the recovery of the stationary Schwarz schild limit, and the new geometric features introduced by a moving mirror . More broadly, this work explores whether CPT-symmetric two-exterior geom etries can offer a viable alternative description of dynamical black-hole spacetimes without the need to introduce a conventional black-hole interio r. In this way, the dynamical black-mirror framework emerges as a promisin g avenue for confronting some of the longstanding theoretical challenges a ssociated with the conventional black-hole picture. ADVISOR(s): Dr. Davi d Kagan, Department of Physics, (David.kagan@umassd.edu) COMMITTEE MEMBERS : Dr. Robert Fisher, Department of PhysicsDr. Jay Wang, Department of Physics NOTE: All PHY Graduate Students are ENCOURAGED to attend.\nE vent page: https://www.umassd.edu/events/cms/9-11-26-thesis-defense--by-za chary-p-pereira.php X-ALT-DESC;FMTTYPE=text/html:

Abstract:

Blac k holes stand among the most profound predictions of general relativity\, yet their conventional interiors introduce unresolved conceptual difficult ies and deep paradoxes. Recent work by Tzanavaris\, Boyle\, and Turok has proposed the black mirror as a CPT-symmetric alternative to the standard b lack-hole geometry. In the stationary construction\, the conventional inte rior is replaced by a second CPT-related exterior region\, with the two ex teriors joined at the horizon. Although the stationary black-mirror geomet ry can be constructed explicitly\, its extension to gravitational collapse remains conjectural.

This thesis investigates a possible dynamica l realization of the black-mirror by using the Vaidya spacetime as a model of spherical gravitational accretion. We construct and analyze a two-shee ted\, CPT-related geometry in which the exterior regions of a black hole a re joined at the evolving apparent horizon and examine how the stationary black-mirror structure generalizes as the mass evolves time-dependently. P articular attention in this approach is given to the consistency of the pr oposed matching\, the recovery of the stationary Schwarzschild limit\, and the new geometric features introduced by a moving mirror. More broadly\, this work explores whether CPT-symmetric two-exterior geometries can offer a viable alternative description of dynamical black-hole spacetimes witho ut the need to introduce a conventional black-hole interior. In this way\, the dynamical black-mirror framework emerges as a promising avenue for co nfronting some of the longstanding theoretical challenges associated with the conventional black-hole picture.

ADVISOR(s): Dr. David Kagan \, Department of Physics\, (David.kagan@umassd.edu)

COMMITTEE MEMB ERS:

Dr. Robert Fisher\, Department of Physics
Dr. Ja y Wang\, Department of Physics

NOTE: All PHY Graduate Students a re ENCOURAGED to attend.

Event page: https://www. umassd.edu/events/cms/9-11-26-thesis-defense--by-zachary-p-pereira.php

DTSTAMP:20260827T224838 DTSTART;TZID=America/New_York:20260911T150000 DTEND;TZID=America/New_York:20260911T170000 LOCATION:SENG 306 SUMMARY;LANGUAGE=en-us:Physics Master of Science Thesis Defense by Zachary P. Pereira UID:50c8dee3ce010bac36781b456d38221f@www.umassd.edu END:VEVENT END:VCALENDAR