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arXiv · 2403.11610

On the weak and strong field effects in antiscalar background

Eduard Mychelkin·Maxim Makukov·Gulnara Suliyeva·Nosratollah Jafari
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Abstract

The triumph of general relativity under the banner "gravity is geometry" began with confirming the crucial effects within the Solar system and proceeded recently to the strong-field shadow effect for the compact object in the center of the Milky Way. Here, we examine some of those phenomena for the Einstein-scalar equations in the antiscalar regime to reveal the difference from vacuum both in weak and strong fields. As a result, we find that for week-field perihelion shift the difference between vacuum and antiscalar cases proves to be observationally imperceptible in practice, even for S-cluster stars with high eccentricities, and even if accumulated over a century. In strong-field case, we reconsider the shadow effect (this time without involving complex-valued scalar field) as the most perspective from an observational viewpoint. Even though the resulting difference is quite appreciable (about 5%), no conclusion can be made until the mass of the central object is known with the accuracy an order of magnitude higher than the currently available.

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Eduard Mychelkin, Maxim Makukov, Gulnara Suliyeva, Nosratollah Jafari. 2024-03-18. On the weak and strong field effects in antiscalar background. https://arxiv.org/abs/2403.11610

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