Title: Comments on holographic description of Narain theories.

Abstract: I will discus
s to what extent holographic description of

Narain theories can mimic the convention
al picture of large c

holography with weakly coupled gravity in the bulk. Namely is
it

possibl
e that the effective IR bulk theory consist of “$U(1)$

gravity” amended with some ad
ditional states. This picture leads to a

hypothesis that in the large central charge
limit density of states of

any Narain theory would be bounded by below by that one
of “$U(1)$

gravity.” This immediately implies maximal value of spectral gap of

primary fields
is $Delta_1=c/(2pi e)$. In the rest of the talk I

will discuss self-consistency of t
his picture using quantum code and

chiral CFTs. First\, I will show the proposed pic
ture yields a new

bound on quantum stabilizer codes\, which is compatible with previ
ously

know
n bounds in the literature. Next\, I will discuss variance of the**density of states\
, which for consistency\, must be vanishingly small inthe large $c$ limit. I will c
onsider ensembles of code and chiral
DTSTART;TZID=Asia/Jerusalem:20210105T160000
DTEND;TZID=Asia/Jerusalem:20210105T170000
SEQUENCE:0
SUMMARY:Anatoly Dymarsky
URL:https://phsites.technion.ac.il/strings/event/anatoly-dymarsky-2/
END:VEVENT
END:VCALENDAR
**