The amazing world of String Theory PDF
Preview The amazing world of String Theory
The amazing world of String Theory Keshav Dasgupta Department of Physics McGill University Montréal, QC, CANADA Dasgupta (McGill) StringTheory Homer2012 1/92 The starting point is the so-called Nambu-Goto action Z r ∂Xµ∂Xν S = −T d2σ −det η NG ∂σα ∂σβ µν where T is the tension of the string, σα are the world-sheet coordinates, Xµ are the space-time coordinates and η is the flat µν spacetime metric. String theory is an amazing branch of science that manages to unify all matter and interactions under one simple idea Dasgupta (McGill) StringTheory Homer2012 2/92 where T is the tension of the string, σα are the world-sheet coordinates, Xµ are the space-time coordinates and η is the flat µν spacetime metric. String theory is an amazing branch of science that manages to unify all matter and interactions under one simple idea The starting point is the so-called Nambu-Goto action Z r ∂Xµ∂Xν S = −T d2σ −det η NG ∂σα ∂σβ µν Dasgupta (McGill) StringTheory Homer2012 2/92 String theory is an amazing branch of science that manages to unify all matter and interactions under one simple idea The starting point is the so-called Nambu-Goto action Z r ∂Xµ∂Xν S = −T d2σ −det η NG ∂σα ∂σβ µν where T is the tension of the string, σα are the world-sheet coordinates, Xµ are the space-time coordinates and η is the flat µν spacetime metric. Dasgupta (McGill) StringTheory Homer2012 2/92 You really didn’t come here to listen to this, did you? I was just kidding! Lets start our talk now hopefully I’ll manage to explain what on earth is string theory! Its also a good time to open your can of draft beer! The more useful version is the so-called Polyakov action, that goes in the following way Z √ S = −T d2σ hhαβ∂ Xµ∂ Xνη α β µν Dasgupta (McGill) StringTheory Homer2012 3/92 I was just kidding! Lets start our talk now hopefully I’ll manage to explain what on earth is string theory! Its also a good time to open your can of draft beer! The more useful version is the so-called Polyakov action, that goes in the following way Z √ S = −T d2σ hhαβ∂ Xµ∂ Xνη α β µν You really didn’t come here to listen to this, did you? Dasgupta (McGill) StringTheory Homer2012 3/92 Lets start our talk now hopefully I’ll manage to explain what on earth is string theory! Its also a good time to open your can of draft beer! The more useful version is the so-called Polyakov action, that goes in the following way Z √ S = −T d2σ hhαβ∂ Xµ∂ Xνη α β µν You really didn’t come here to listen to this, did you? I was just kidding! Dasgupta (McGill) StringTheory Homer2012 3/92 hopefully I’ll manage to explain what on earth is string theory! Its also a good time to open your can of draft beer! The more useful version is the so-called Polyakov action, that goes in the following way Z √ S = −T d2σ hhαβ∂ Xµ∂ Xνη α β µν You really didn’t come here to listen to this, did you? I was just kidding! Lets start our talk now Dasgupta (McGill) StringTheory Homer2012 3/92 Its also a good time to open your can of draft beer! The more useful version is the so-called Polyakov action, that goes in the following way Z √ S = −T d2σ hhαβ∂ Xµ∂ Xνη α β µν You really didn’t come here to listen to this, did you? I was just kidding! Lets start our talk now hopefully I’ll manage to explain what on earth is string theory! Dasgupta (McGill) StringTheory Homer2012 3/92 The more useful version is the so-called Polyakov action, that goes in the following way Z √ S = −T d2σ hhαβ∂ Xµ∂ Xνη α β µν You really didn’t come here to listen to this, did you? I was just kidding! Lets start our talk now hopefully I’ll manage to explain what on earth is string theory! Its also a good time to open your can of draft beer! Dasgupta (McGill) StringTheory Homer2012 3/92
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