2012年6月20日 · The dilaton field is then an essential component of all superstrings models, and thus of the cosmological scenarios based on effective string actions. Chapter 9 in Maurizios Gasperini’s String Cosmology book is a very nice introduction to dilaton phenomenology and its importance in cosmology.

Dilaton is the generic name of the Goldstone Boson (GB) associated with spontaneous breaking of scale invariance. Any model that break scale invariance spontaneously will give rise to a dilaton. N=4 SYM for example has a moduli space and any modulus away form the origin will break conformal invariance, and a massless dilaton would appear.

2013年6月27日 · In this approach, you will see that the CFTs may have the term above, with a general function $\Phi(X)$ that has to obey a Klein-Gordon-like (with a potential) equation, the spacetime field equation for the dilaton field, for the 1-loop corrections to the world sheet scale invariance to cancel and everything else in the spacetime will depend on ...

I have read at some places that a dilaton field is associated with the spontaneous breaking of scale symmetry in a theory. (While others would be difficult to trace right now, the most easily acces...

2021年5月20日 · In a sense, this is the result of introducing a spacetime cutoff which moves the boundary inwards a bit. Because only at the boundary at spatial infinity gravity can be neglected, this cutoff boundary feels the effect of gravity and the dilaton becomes dynamical. This is often called the boundary particle.

2021年6月17日 · In these lecture notes by Strominger section 3.3 we derive the equations of motion of the Classical Dilaton Gravity action $$ S = \frac{1}{2\pi}\int{d^2x}{\sqrt{-g}e^{-2\phi}\left(R +4 (\nabla\phi)...

2012年11月23日 · I am a co-founder of PhysicsOverflow (www.physicsoverflow.org), where I am mostly active these days.. For me personally, this site has unfortunately lost its usefulness for advancing and deepening my own physics knowledge, as most (even very advanced up to research-level) deep and interesting technical theoretical physics questions that contain LaTex …

2018年6月16日 · Dilaton field is one of the matter fields which comes from the string theory. However, people consider it as a scalar field in black hole physics, so the dilaton particle in this regard is spinless. In the low energy limit, the mass of dilaton is zero and also it has no charge. So, all three quantum numbers of dilaton are zero.

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2021年3月5日 · So the dilaton VEV does not change the mass of massive excitations, although it does dictate the relevance of gravitational effects at the characteristic string length scale $\ell_s$, and by extension, uniquely fixes the 26D Newton's constant.