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Forums
Physics
Beyond the Standard Models
Is the Continuum Limit of Spin Foam Dynamics Equivalent to Massless Gravitons?
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[QUOTE="kodama, post: 6656680, member: 551353"] Bianca Dittrich Modified general relativity from the continuum limit of effective spin foams Effective spin foams have been introduced to facilitate the extraction of dynamical information from the spin foam path integral. In this talk I will illustrate that effective spin foams have delivered on this promise: I will review how effective spin foams provided a transparent explanation of how the flatness problem of spin foams is avoided in the discrete. With some assumptions on the spin foam path integral, the effective spin foam approach can be also used to determine the continuum limit of spin foam dynamics. To leading order the dynamics is given by a massless graviton, but includes corrections arising from the emergence of an effective area metric. I will then derive the same dynamics directly from a modified Plebanski action. This does provide strong evidence that spin foams reproduce general relativity in the continuum limit and opens new avenues to study the phenomenological implications of spin foams. [URL]https://indico.cern.ch/event/1100970/page/23817-plenary-talks[/URL] [/QUOTE]
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Physics
Beyond the Standard Models
Is the Continuum Limit of Spin Foam Dynamics Equivalent to Massless Gravitons?
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