scholarly journals Dilaton Coupling Revisited

2010 ◽  
Vol 124 (4) ◽  
pp. 581-590
Author(s):  
S. Uehara
Keyword(s):  
Dilaton Coupling

scholarly journals Quasinormal modes of dilatonic Reissner–Nordström black holes

2019 ◽  
Vol 79 (12) ◽  
Author(s):  
Jose Luis Blázquez-Salcedo ◽  
Sarah Kahlen ◽  
Jutta Kunz
Keyword(s):  
Black Holes ◽  
Quantitative Analysis ◽  
Electric Charge ◽  
Quasinormal Modes ◽  
Spherically Symmetric ◽  
Coupling Constant ◽  
Dilaton Coupling

AbstractWe calculate the quasinormal modes of static spherically symmetric dilatonic Reissner–Nordström black holes for general values of the electric charge and of the dilaton coupling constant. The spectrum of quasinormal modes is composed of five families of modes: polar and axial gravitational-led modes, polar and axial electromagnetic-led modes, and polar scalar-led modes. We make a quantitative analysis of the spectrum, revealing its dependence on the electric charge and on the dilaton coupling constant. For large electric charge and large dilaton coupling, strong deviations from the Reissner–Nordström modes arise. In particular, isospectrality is strongly broken, both for the electromagnetic-led and the gravitational-led modes, for large values of the charge.

scholarly journals DILATONIC GRAVITY NEAR TWO DIMENSIONS AS A STRING THEORY

1995 ◽  
Vol 10 (27) ◽  
pp. 2001-2008 ◽  
Author(s):  
E. ELIZALDE ◽  
S.D. ODINTSOV
Keyword(s):  
Fixed Point ◽  
Renormalization Group ◽  
String Theory ◽  
Sigma Model ◽  
Scalar Fields ◽  
Two Dimensions ◽  
Gravitational Coupling ◽  
Dilaton Coupling

Using the renormalization group formalism, a sigma model of a special type — in which the metric and the dilaton depend explicitly on one of the string coordinates only — is investigated near two dimensions. It is seen that dilatonic gravity coupled to N scalar fields can be expressed in this form, using a string parametrization, and that it possesses the usual uv fixed point. However, in this stringy parametrization of the theory the fixed point for the scalar-dilaton coupling turns out to be trivial, while that for the gravitational coupling remains the same as in previous studies being, in particular, nontrivial.

scholarly journals QUANTUM CORRECTIONS TO ENTROPY OF CHARGED DILATONIC BLACK HOLES IN ARBITRARY DIMENSIONS

1994 ◽  
Vol 09 (38) ◽  
pp. 3509-3516 ◽  
Author(s):  
KIYOSHI SHIRAISHI
Keyword(s):  
Black Holes ◽  
Dimensional Space ◽  
Brick Wall ◽  
High Temperature Expansion ◽  
Dimensional Space Time ◽  
Cutoff Distance ◽  
Arbitrary Dimensions ◽  
Qualitative Argument ◽  
Dilaton Coupling ◽  
Dilatonic Black Hole

The quantum contribution of a scalar field to entropy of a dilatonic black hole is calculated in the brick wall model by the WKB method and analyzed by a high-temperature expansion. If the cutoff distance from the horizon approaches zero, the leading divergent piece of entropy turns out to be proportional to the “area” of the horizon surface (which has (N−1)-dimensional extension in (N+1)-dimensional space-time) and independent of other properties of black holes even in the case of general dilaton coupling. There is also qualitative argument with the known result of subleading divergence for N=3.

VERTEX OPERATORS FOR THE CLOSED BOSONIC STRING THEORY AT ARBITRARY GENUS IN THE OPERATOR FORMALISM

1990 ◽  
Vol 05 (12) ◽  
pp. 2391-2409 ◽  
Author(s):  
ADRIAN R. LUGO
Keyword(s):  
String Theory ◽  
Bosonic String ◽  
Integral Approach ◽  
Vertex Operators ◽  
Operator Formalism ◽  
Covariant Derivatives ◽  
Bosonic String Theory ◽  
Dilaton Coupling ◽  
Derivatives Of ◽  
Closed Bosonic String

A systematic procedure for constructing vertex operators for the physical states of the closed bosonic string theory at genus g in the operator formalism is presented. The method is based on imposing suitable commutation relations with the generators of the conformal transformations required by unitarity of scattering amplitudes. An Arakelov-type metric on the Riemann surface naturally arises in the case of the tachyon, which allows to define vertex operators at higher levels via covariant derivatives. They involve covariant derivatives of the curvature with respect to this metric as it happens in the path integral approach. As a particular result, the Fradkin-Tseytlin dilaton coupling is obtained.

scholarly journals Dilaton coupling and BRST quantization of bosonic strings

1986 ◽  
Vol 277 ◽  
pp. 67-86 ◽  
Author(s):  
Thomas Banks ◽  
Dennis Nemeschansky ◽  
Ashoke Sen
Keyword(s):  
Bosonic Strings ◽  
Brst Quantization ◽  
Dilaton Coupling

scholarly journals DARK MATTER WITH VARIABLE MASSES

1993 ◽  
Vol 02 (01) ◽  
pp. 85-95 ◽  
Author(s):  
JUAN GARCÍA-BELLIDO
Keyword(s):  
Dark Matter ◽  
Galaxy Formation ◽  
Cold Dark Matter ◽  
Spiral Galaxies ◽  
Energy Momentum Tensor ◽  
Gauge Coupling ◽  
Momentum Tensor ◽  
Primordial Nucleosynthesis ◽  
Effective Theories ◽  
Dilaton Coupling

String effective theories contain a dilaton scalar field which couples to gravity, matter and radiation. In general, particle masses will have different dilaton couplings. We can always choose a conformal frame in which baryons have constant masses while (nonbaryonic) dark matter have variable masses, in the context of a scalar-tensor gravity theory. We are interested in the phenomenology of this scenario. Dark matter with variable masses could have a measurable effect on the dynamical motion of the halo of spiral galaxies, which may affect cold dark matter models of galaxy formation. As a consequence of variable masses, the energy-momentum tensor is not conserved; there is a dissipative effect, due to the dilaton coupling, associated with a “dark entropy” production. In particular, if axions had variable masses they could be diluted away, thus opening the “axion window.” Assuming that dark matter with variable masses dominates the cosmological evolution during the matter era, it will affect the primordial nucleosynthesis predictions on the abundances of light elements. Furthermore, the dilaton also couples to radiation in the form of a variable gauge coupling. Experimental bounds will constrain the parameters of this model.

Kalb–Ramond field localization in sine-Gordon braneworld models

2017 ◽  
Vol 32 (11) ◽  
pp. 1750058 ◽  
Author(s):  
M. Moazzen
Keyword(s):  
Mass Spectrum ◽  
Scalar Field ◽  
Zero Mode ◽  
The Other ◽  
Coupling Constant ◽  
Real Scalar ◽  
Field Localization ◽  
Dilaton Coupling

In this paper, we investigate Kalb–Ramond field localization in two types of five-dimensional braneworld models given by sine-Gordon potentials. The sine-Gordon (SG) and double sine-Gordon (DSG) branes are generated by a real scalar field coupled to gravity minimally. In both scenarios, we employ two localization mechanisms. One is the well-known dilaton coupling and the other is based on a five-dimensional Stueckelberg-like action. With two mechanisms, we find that the massless zero mode of Kalb–Ramond field is localized on the SG and DSG branes. Also, it is shown that both the mechanisms can result in a volcano-like potential of the Kalb–Ramond massive modes. Furthermore, we study the effects of the dilaton coupling constant on the mass spectrum of the Kalb–Ramond field.

scholarly journals CLASSICAL AND QUANTUM SCATTERING OF MAXIMALLY CHARGED DILATON BLACK HOLES

1993 ◽  
Vol 02 (01) ◽  
pp. 59-77 ◽  
Author(s):  
KIYOSHI SHIRAISHI
Keyword(s):  
Black Holes ◽  
Impact Parameter ◽  
Critical Value ◽  
Quantum Scattering ◽  
Dilaton Coupling ◽  
The Impact ◽  
Dilaton Black Holes

The classical and the quantum scattering of two maximally-charged dilaton black holes which have low velocities are studied. We find a critical value for the dilaton coupling, a2=1/3. For a2>1/3, two black holes are always scattered away and never coalesce together, regardless of the value of the impact parameter.

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