Comment on ‘Towards gravitationally assisted negative refraction of light by vacuum’
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چکیده
منابع مشابه
Towards gravitationally assisted negative refraction of light by vacuum
Propagation of electromagnetic plane waves in some directions in gravitationally affected vacuum over limited ranges of spacetime can be such that the phase velocity vector casts a negative projection on the time–averaged Poynting vector. This conclusion suggests, inter alia, gravitationally assisted negative refraction by vacuum.
متن کاملNegative refraction of light by vacuum
Propagation of electromagnetic plane waves in some directions in gravitationally affected vacuum over limited ranges of spacetime can be such that the phase velocity vector casts a negative projection on the time–averaged Poynting vector. This conclusion suggests, inter alia, gravitationally assisted negative refraction by vacuum.
متن کاملNegative refraction by quantum vacuum
The phase velocity of light is co–parallel to the direction of energy flow in classical vacuum. However, in certain uncommon materials, these two vectors can be oppositely directed, in which case the phase velocity is termed ‘negative’. This negative phase velocity (NPV) gives rise to many exotic phenomenons, such as negative refraction, inverse Doppler shift and inverse C̆erenkov radiation, and...
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در این رساله با معرفی سقف های psscb متشکل از ترکیب ورق های فولادی ذوزنقه ای و تخته های سیمانی الیافی به عنوان سقف های پیش ساخته (سازگار با سیستم سازه ای قاب های فولادی سبک) به بررسی پارامترهای موثر بر صلبیت سقف، پرداخته می شود. در تحقیق حاضر ابتدا به مدل سازی دو نمونه سقف آزمایش شده، به روش اجزاء محدود با استفاده از نرم افزار تحلیلی abaqus ver 6.10 پرداخته شده است. نمونه های ساخته شده تحت اعما...
Global and local perspectives of gravitationally assisted negative–phase–velocity propagation of electromagnetic waves in vacuum
Consistently with the Einstein equivalence principle, we show that a local observer cannot observe negative–phase–velocity propagation of electromagnetic waves in vacuum, whereas a global observer can. PACS: 04.20.Cv, 03.50.De
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ژورنال
عنوان ژورنال: Journal of Physics A: Mathematical and General
سال: 2005
ISSN: 0305-4470,1361-6447
DOI: 10.1088/0305-4470/38/11/n01