BEGIN:VCALENDAR
VERSION:2.0
PRODID:researchseminars.org
CALSCALE:GREGORIAN
X-WR-CALNAME:researchseminars.org
BEGIN:VEVENT
SUMMARY:Christos Charmoussis (University of Paris-Saclay)
DTSTART:20260204T100000Z
DTEND:20260204T110000Z
DTSTAMP:20260404T095243Z
UID:MathematicalPhysicsSeminarAuth/1
DESCRIPTION:Title: <a href="https://stable.researchseminars.org/talk/Mathe
 maticalPhysicsSeminarAuth/1/">Black Holes with Primary Hair</a>\nby Christ
 os Charmoussis (University of Paris-Saclay) as part of AUTH-MATH-PH\n\nLec
 ture held in Room M2 in the Department of Mathematics\, Aristotle Universi
 ty of Thessaloniki.\n\nAbstract\nGeneral Relativity black holes are descri
 bed by mass\, angular momentum and electric/magnetic charge. They are said
  to have no hair in the\nsense that they are uniquely defined by these cha
 rges as measured from a far away observer and not by other details. These 
 characteristics are\nthought to persist in modified theories of gravity by
  so called no hair theorems. We will see how one can bifurcate the no hair
  paradigm and\nconstruct explicit black hole solutions that admit addition
 al independent charges in theories modifying general relativity. These bla
 ck holes have\nadditional properties that make them quite different from t
 heir GR solutions. We will give two different theories with two different 
 explicit examples\nand their properties.\n\nFor the online Meeting ID and 
 Passcode:\nMeeting ID: 914 5708 9061\nPasscode: 928529\n
LOCATION:https://stable.researchseminars.org/talk/MathematicalPhysicsSemin
 arAuth/1/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nikolaos Athanasiou (Aristotle University of Thessaloniki)
DTSTART:20260304T130000Z
DTEND:20260304T140000Z
DTSTAMP:20260404T095243Z
UID:MathematicalPhysicsSeminarAuth/2
DESCRIPTION:Title: <a href="https://stable.researchseminars.org/talk/Mathe
 maticalPhysicsSeminarAuth/2/">The Einstein-Vlasov System in a Large Data R
 egime</a>\nby Nikolaos Athanasiou (Aristotle University of Thessaloniki) a
 s part of AUTH-MATH-PH\n\nLecture held in Room M2 in the Department of Mat
 hematics\, Aristotle University of Thessaloniki.\n\nAbstract\nIn this talk
 \, our object of study is the Einstein-Vlasov system with a massless Vlaso
 v matter field. Our main contribution is the provision of a novel techniqu
 e for controlling the Vlasov matter in a double null gauge\, relying purel
 y on vector field commutation and bypassing the need for introducing Jacob
 i fields\, which has so far been the only existing technique outside of sy
 mmetry in this gauge. To obtain it\, we have to overcome stringent regular
 ity issues that are existent along this path. Because it relies solely on 
 vector field commutation\, our technique is fundamentally simple and flexi
 ble enough to be applicable in any data regime. We thus anticipate this to
  be a helpful tool for many subsequent problems regarding the Einstein-Vla
 sov system\, including\, for instance\, simplified approaches to the proof
  of nonlinear stability of Minkowski spacetime with massless Vlasov matter
 \, scattering problems for data close to black holes\, approaching cosmic 
 censorship\, etc. We further introduce and work in an optimal regularity f
 ramework\, using this new technique\, to obtain a large data semi-global e
 xistence theorem and a dynamical trapped surface formation statement for o
 ur system. Joint work with Puskar Mondal and Shing-Tung Yau.\n\nMeeting ID
 : 914 5708 9061\nPasscode: 928529\n
LOCATION:https://stable.researchseminars.org/talk/MathematicalPhysicsSemin
 arAuth/2/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Grigorios Fournodavlos (University of Crete-FORTH)
DTSTART:20260402T100000Z
DTEND:20260402T110000Z
DTSTAMP:20260404T095243Z
UID:MathematicalPhysicsSeminarAuth/3
DESCRIPTION:Title: <a href="https://stable.researchseminars.org/talk/Mathe
 maticalPhysicsSeminarAuth/3/">Big Bang Singularities</a>\nby Grigorios Fou
 rnodavlos (University of Crete-FORTH) as part of AUTH-MATH-PH\n\nLecture h
 eld in Room M2 in the Department of Mathematics\, Aristotle University of 
 Thessaloniki.\n\nAbstract\nWe will present the classical cosmological mode
 ls in general relativity that contain a Big Bang singularity and discuss t
 heir dynamics. The conjectural picture in physics was put forth in the lat
 e 60's - early 70's. Despite numerous efforts\, it has only been partially
  confirmed. We will review recent state of the art mathematical results an
 d pose questions for future work.\n\nFor the online Meeting ID and Passcod
 e: Meeting ID: 914 5708 9061 Passcode: 928529\n
LOCATION:https://stable.researchseminars.org/talk/MathematicalPhysicsSemin
 arAuth/3/
END:VEVENT
END:VCALENDAR