Constraining superluminal Einstein-Æther gravity through gravitational memory
Every emission of radiation in gravity also includes a nonwavelike component that leaves a permanent change in proper distances of the spacetime it travels through. This phenomenon is known as gravitational displacement memory. Building up on a recently developed computation framework that harnesses...
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| Main Authors: | , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
22 July 2025
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| In: |
Physical review
Year: 2025, Volume: 112, Issue: 2, Pages: 1-35 |
| ISSN: | 2470-0029 |
| DOI: | 10.1103/2zds-qq93 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/2zds-qq93 Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/2zds-qq93 
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| Author Notes: | Lavinia Heisenberg, Benedetta Rosatello, Guangzi Xu, and Jann Zosso |
| Summary: | Every emission of radiation in gravity also includes a nonwavelike component that leaves a permanent change in proper distances of the spacetime it travels through. This phenomenon is known as gravitational displacement memory. Building up on a recently developed computation framework that harnesses Isaacson’s insights on a fundamental definition of gravitational waves, we compute the leading displacement memory formula in Einstein-Æther gravity. Our analysis represents the first direct calculation of gravitational memory in a metric theory with nontrivial asymptotic vector field value. We find that an emission of scalar and vector æther waves at a propagation speed greater than the speed of tensor radiation features unprotected causal directions with a priori unbound memory buildup. Based on the results and the existing constraint of luminally propagating tensor waves, we conjecture a stringent exclusion of the superluminal parameter space of Einstein-Æther gravity. |
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| Item Description: | Gesehen am 15.12.2025 |
| Physical Description: | Online Resource |
| ISSN: | 2470-0029 |
| DOI: | 10.1103/2zds-qq93 |