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UID:6ad83fd645db1
DTSTART:20261028T110000Z
SEQUENCE:0
TRANSP:OPAQUE
DTEND:20261028T120000Z
LOCATION:Seminar Room
SUMMARY:ICFO | HIPPOLYTE DOURDENT
CLASS:PUBLIC
DESCRIPTION:Extremely popular in science-fiction\, causal loops are also se
 riously studied in fundamental physics\, since general relativity does not
  forbid them. Their notoriety is entangled with the grandfather paradox: a
  (hypothetically) physical contradiction in which a cause suppresses its o
 wn effect. What principle\, then\, prevents causal loops from generating s
 uch paradoxes? In an information-theoretic framework\, the answer is forma
 lized as a logical consistency principle: a causal loop should always gene
 rate valid probabilities under arbitrary independent local interventions b
 y agents. But how can consistency be certified? Could it be characterized 
 intrinsically\, in terms of the loop alone\, without reference to the agen
 ts acting on it?I will show that\, for classical deterministic processes\,
  logical consistency is found to hold exactly when the list of events is p
 airwise exclusive and complete. This yields the first event-based\, interv
 ention-free\, non-recursive characterization of consistent causal loops. I
 t also reveals that the most general form of single-round\, deterministic\
 , classical communication allowed by logic is completely captured by a mul
 tipartite form of Specker&rsquo\;s principle\, which plays a central role 
 in explaining why quantum correlations are not more nonlocal than they are
 . Finally\, I will explain how the Ac&iacute\;n-Fritz-Leverrier-Sainz hype
 rgraph representation of Bell scenarios recasts these causal loops as a no
 n-standard way of composing no-signaling black boxes.Based on: https://arx
 iv.org/abs/2609.39735 \; https://arxiv.org/abs/2610.23367
DTSTAMP:20261021T043014Z
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