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Soft Limit of Double Copy DBI

Gelling, Olivier (2022) Soft Limit of Double Copy DBI. Master's Thesis / Essay, Physics.

Thesis Olivier Gelling 26-08-2022 The Soft Limit of Double Copy DBI.pdf

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In this thesis we will attempt to reconstruct the 6-point DBI amplitude through the Double Copy method and probe it using soft limits. This specific example is chosen because DBI is both a Nambu-Goldstone boson and an exceptional Effective Field Theory, meaning it has unique soft limit cancellation properties. The relevant theoretical groundwork are explained and simplified examples of both traditional Feynman and Double Copy amplitudes are constructed in order to showcase their workings. Along with this we present some discussions of the soft limit, enhanced soft degrees, and some noteworthy examples relevant to the fields of soft limits, the Double Copy, and Nambu-Goldstone bosons. A fully usable Double Copy amplitude is not found due to the result containing many terms with forbidden factorisation. However, momentum space sample sets are taken to confirm that it should indeed factorise correctly. We will present the particular terms that constitute the soft cancellation of DBI’s 6-point interaction found through Feynman and will discuss the way these can be interpreted in the DC amplitude. Potential similarities and discrepancies are presented and certain implications of those are discussed. Among these is the notion that one might be able to further constrain numerator terms constituting the Double Copy method.

Item Type: Thesis (Master's Thesis / Essay)
Supervisor name: Roest, D. and Bergshoeff, E.A.
Degree programme: Physics
Thesis type: Master's Thesis / Essay
Language: English
Date Deposited: 01 Sep 2022 10:39
Last Modified: 01 Sep 2022 10:39

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